[runtime] Fix "make distcheck"

[mono-project.git] / mono / io-layer / io.c

/*
 * io.c:  File, console and find handles
 *
 * Author:
 *      Dick Porter (dick@ximian.com)
 *
 * (C) 2002 Ximian, Inc.
 * Copyright (c) 2002-2006 Novell, Inc.
 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
 */

#include <config.h>
#include <glib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#if defined(HAVE_SYS_STATFS_H)
#include <sys/statfs.h>
#endif
#if defined(HAVE_SYS_PARAM_H) && defined(HAVE_SYS_MOUNT_H)
#include <sys/param.h>
#include <sys/mount.h>
#endif
#include <sys/types.h>
#include <stdio.h>
#include <utime.h>
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/fs.h>
#include <mono/utils/linux_magic.h>
#endif

#include <mono/io-layer/wapi.h>
#include <mono/io-layer/wapi-private.h>
#include <mono/io-layer/handles-private.h>
#include <mono/io-layer/io-private.h>
#include <mono/io-layer/timefuncs-private.h>
#include <mono/io-layer/thread-private.h>
#include <mono/io-layer/io-portability.h>
#include <mono/utils/strenc.h>

#if 0
#define DEBUG(...) g_message(__VA_ARGS__)
#define DEBUG_ENABLED 1
#else
#define DEBUG(...)
#endif

static void file_close (gpointer handle, gpointer data);
static WapiFileType file_getfiletype(void);
static gboolean file_read(gpointer handle, gpointer buffer,
                          guint32 numbytes, guint32 *bytesread,
                          WapiOverlapped *overlapped);
static gboolean file_write(gpointer handle, gconstpointer buffer,
                           guint32 numbytes, guint32 *byteswritten,
                           WapiOverlapped *overlapped);
static gboolean file_flush(gpointer handle);
static guint32 file_seek(gpointer handle, gint32 movedistance,
                         gint32 *highmovedistance, WapiSeekMethod method);
static gboolean file_setendoffile(gpointer handle);
static guint32 file_getfilesize(gpointer handle, guint32 *highsize);
static gboolean file_getfiletime(gpointer handle, WapiFileTime *create_time,
                                 WapiFileTime *last_access,
                                 WapiFileTime *last_write);
static gboolean file_setfiletime(gpointer handle,
                                 const WapiFileTime *create_time,
                                 const WapiFileTime *last_access,
                                 const WapiFileTime *last_write);
static guint32 GetDriveTypeFromPath (const gchar *utf8_root_path_name);

/* File handle is only signalled for overlapped IO */
struct _WapiHandleOps _wapi_file_ops = {
        file_close,             /* close */
        NULL,                   /* signal */
        NULL,                   /* own */
        NULL,                   /* is_owned */
        NULL,                   /* special_wait */
        NULL                    /* prewait */
};

void _wapi_file_details (gpointer handle_info)
{
        struct _WapiHandle_file *file = (struct _WapiHandle_file *)handle_info;
        
        g_print ("[%20s] acc: %c%c%c, shr: %c%c%c, attrs: %5u",
                 file->filename,
                 file->fileaccess&GENERIC_READ?'R':'.',
                 file->fileaccess&GENERIC_WRITE?'W':'.',
                 file->fileaccess&GENERIC_EXECUTE?'X':'.',
                 file->sharemode&FILE_SHARE_READ?'R':'.',
                 file->sharemode&FILE_SHARE_WRITE?'W':'.',
                 file->sharemode&FILE_SHARE_DELETE?'D':'.',
                 file->attrs);
}

static void console_close (gpointer handle, gpointer data);
static WapiFileType console_getfiletype(void);
static gboolean console_read(gpointer handle, gpointer buffer,
                             guint32 numbytes, guint32 *bytesread,
                             WapiOverlapped *overlapped);
static gboolean console_write(gpointer handle, gconstpointer buffer,
                              guint32 numbytes, guint32 *byteswritten,
                              WapiOverlapped *overlapped);

/* Console is mostly the same as file, except it can block waiting for
 * input or output
 */
struct _WapiHandleOps _wapi_console_ops = {
        console_close,          /* close */
        NULL,                   /* signal */
        NULL,                   /* own */
        NULL,                   /* is_owned */
        NULL,                   /* special_wait */
        NULL                    /* prewait */
};

void _wapi_console_details (gpointer handle_info)
{
        _wapi_file_details (handle_info);
}

/* Find handle has no ops.
 */
struct _WapiHandleOps _wapi_find_ops = {
        NULL,                   /* close */
        NULL,                   /* signal */
        NULL,                   /* own */
        NULL,                   /* is_owned */
        NULL,                   /* special_wait */
        NULL                    /* prewait */
};

static void pipe_close (gpointer handle, gpointer data);
static WapiFileType pipe_getfiletype (void);
static gboolean pipe_read (gpointer handle, gpointer buffer, guint32 numbytes,
                           guint32 *bytesread, WapiOverlapped *overlapped);
static gboolean pipe_write (gpointer handle, gconstpointer buffer,
                            guint32 numbytes, guint32 *byteswritten,
                            WapiOverlapped *overlapped);

/* Pipe handles
 */
struct _WapiHandleOps _wapi_pipe_ops = {
        pipe_close,             /* close */
        NULL,                   /* signal */
        NULL,                   /* own */
        NULL,                   /* is_owned */
        NULL,                   /* special_wait */
        NULL                    /* prewait */
};

void _wapi_pipe_details (gpointer handle_info)
{
        _wapi_file_details (handle_info);
}

static const struct {
        /* File, console and pipe handles */
        WapiFileType (*getfiletype)(void);
        
        /* File, console and pipe handles */
        gboolean (*readfile)(gpointer handle, gpointer buffer,
                             guint32 numbytes, guint32 *bytesread,
                             WapiOverlapped *overlapped);
        gboolean (*writefile)(gpointer handle, gconstpointer buffer,
                              guint32 numbytes, guint32 *byteswritten,
                              WapiOverlapped *overlapped);
        gboolean (*flushfile)(gpointer handle);
        
        /* File handles */
        guint32 (*seek)(gpointer handle, gint32 movedistance,
                        gint32 *highmovedistance, WapiSeekMethod method);
        gboolean (*setendoffile)(gpointer handle);
        guint32 (*getfilesize)(gpointer handle, guint32 *highsize);
        gboolean (*getfiletime)(gpointer handle, WapiFileTime *create_time,
                                WapiFileTime *last_access,
                                WapiFileTime *last_write);
        gboolean (*setfiletime)(gpointer handle,
                                const WapiFileTime *create_time,
                                const WapiFileTime *last_access,
                                const WapiFileTime *last_write);
} io_ops[WAPI_HANDLE_COUNT]={
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* file */
        {file_getfiletype,
         file_read, file_write,
         file_flush, file_seek,
         file_setendoffile,
         file_getfilesize,
         file_getfiletime,
         file_setfiletime},
        /* console */
        {console_getfiletype,
         console_read,
         console_write,
         NULL, NULL, NULL, NULL, NULL, NULL},
        /* thread */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* sem */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* mutex */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* event */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* socket (will need at least read and write) */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* find */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* process */
        {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL},
        /* pipe */
        {pipe_getfiletype,
         pipe_read,
         pipe_write,
         NULL, NULL, NULL, NULL, NULL, NULL},
};

static mono_once_t io_ops_once=MONO_ONCE_INIT;
static gboolean lock_while_writing = FALSE;

static void io_ops_init (void)
{
/*      _wapi_handle_register_capabilities (WAPI_HANDLE_FILE, */
/*                                          WAPI_HANDLE_CAP_WAIT); */
/*      _wapi_handle_register_capabilities (WAPI_HANDLE_CONSOLE, */
/*                                          WAPI_HANDLE_CAP_WAIT); */

        if (g_getenv ("MONO_STRICT_IO_EMULATION") != NULL) {
                lock_while_writing = TRUE;
        }
}

/* Some utility functions.
 */

/*
 * Check if a file is writable by the current user.
 *
 * This is is a best effort kind of thing. It assumes a reasonable sane set
 * of permissions by the underlying OS.
 *
 * We assume that basic unix permission bits are authoritative. Which might not
 * be the case under systems with extended permissions systems (posix ACLs, SELinux, OSX/iOS sandboxing, etc)
 *
 * The choice of access as the fallback is due to the expected lower overhead compared to trying to open the file.
 *
 * The only expected problem with using access are for root, setuid or setgid programs as access is not consistent
 * under those situations. It's to be expected that this should not happen in practice as those bits are very dangerous
 * and should not be used with a dynamic runtime.
 */
static gboolean
is_file_writable (struct stat *st, const char *path)
{
        /* Is it globally writable? */
        if (st->st_mode & S_IWOTH)
                return 1;

        /* Am I the owner? */
        if ((st->st_uid == geteuid ()) && (st->st_mode & S_IWUSR))
                return 1;

        /* Am I in the same group? */
        if ((st->st_gid == getegid ()) && (st->st_mode & S_IWGRP))
                return 1;

        /* Fallback to using access(2). It's not ideal as it might not take into consideration euid/egid
         * but it's the only sane option we have on unix.
         */
        return access (path, W_OK) == 0;
}


static guint32 _wapi_stat_to_file_attributes (const gchar *pathname,
                                              struct stat *buf,
                                              struct stat *lbuf)
{
        guint32 attrs = 0;
        gchar *filename;
        
        /* FIXME: this could definitely be better, but there seems to
         * be no pattern to the attributes that are set
         */

        /* Sockets (0140000) != Directory (040000) + Regular file (0100000) */
        if (S_ISSOCK (buf->st_mode))
                buf->st_mode &= ~S_IFSOCK; /* don't consider socket protection */

        filename = _wapi_basename (pathname);

        if (S_ISDIR (buf->st_mode)) {
                attrs = FILE_ATTRIBUTE_DIRECTORY;
                if (!is_file_writable (buf, pathname)) {
                        attrs |= FILE_ATTRIBUTE_READONLY;
                }
                if (filename[0] == '.') {
                        attrs |= FILE_ATTRIBUTE_HIDDEN;
                }
        } else {
                if (!is_file_writable (buf, pathname)) {
                        attrs = FILE_ATTRIBUTE_READONLY;

                        if (filename[0] == '.') {
                                attrs |= FILE_ATTRIBUTE_HIDDEN;
                        }
                } else if (filename[0] == '.') {
                        attrs = FILE_ATTRIBUTE_HIDDEN;
                } else {
                        attrs = FILE_ATTRIBUTE_NORMAL;
                }
        }

        if (lbuf != NULL) {
                if (S_ISLNK (lbuf->st_mode)) {
                        attrs |= FILE_ATTRIBUTE_REPARSE_POINT;
                }
        }
        
        g_free (filename);
        
        return attrs;
}

static void
_wapi_set_last_error_from_errno (void)
{
        SetLastError (_wapi_get_win32_file_error (errno));
}

static void _wapi_set_last_path_error_from_errno (const gchar *dir,
                                                  const gchar *path)
{
        if (errno == ENOENT) {
                /* Check the path - if it's a missing directory then
                 * we need to set PATH_NOT_FOUND not FILE_NOT_FOUND
                 */
                gchar *dirname;


                if (dir == NULL) {
                        dirname = _wapi_dirname (path);
                } else {
                        dirname = g_strdup (dir);
                }
                
                if (_wapi_access (dirname, F_OK) == 0) {
                        SetLastError (ERROR_FILE_NOT_FOUND);
                } else {
                        SetLastError (ERROR_PATH_NOT_FOUND);
                }

                g_free (dirname);
        } else {
                _wapi_set_last_error_from_errno ();
        }
}

/* Handle ops.
 */
static void file_close (gpointer handle, gpointer data)
{
        struct _WapiHandle_file *file_handle = (struct _WapiHandle_file *)data;
        int fd = file_handle->fd;
        
        DEBUG("%s: closing file handle %p [%s]", __func__, handle,
                  file_handle->filename);

        if (file_handle->attrs & FILE_FLAG_DELETE_ON_CLOSE)
                _wapi_unlink (file_handle->filename);
        
        g_free (file_handle->filename);
        
        if (file_handle->share_info)
                _wapi_handle_share_release (file_handle->share_info);
        
        close (fd);
}

static WapiFileType file_getfiletype(void)
{
        return(FILE_TYPE_DISK);
}

static gboolean file_read(gpointer handle, gpointer buffer,
                          guint32 numbytes, guint32 *bytesread,
                          WapiOverlapped *overlapped)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        int fd, ret;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }

        fd = file_handle->fd;
        if(bytesread!=NULL) {
                *bytesread=0;
        }
        
        if(!(file_handle->fileaccess & GENERIC_READ) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_READ access: %u",
                          __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }

        do {
                ret = read (fd, buffer, numbytes);
        } while (ret == -1 && errno == EINTR &&
                 !_wapi_thread_cur_apc_pending());
                        
        if(ret==-1) {
                gint err = errno;

                DEBUG("%s: read of handle %p error: %s", __func__,
                          handle, strerror(err));
                SetLastError (_wapi_get_win32_file_error (err));
                return(FALSE);
        }
                
        if (bytesread != NULL) {
                *bytesread = ret;
        }
                
        return(TRUE);
}

static gboolean file_write(gpointer handle, gconstpointer buffer,
                           guint32 numbytes, guint32 *byteswritten,
                           WapiOverlapped *overlapped G_GNUC_UNUSED)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        int ret, fd;
        off_t current_pos = 0;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }

        fd = file_handle->fd;
        
        if(byteswritten!=NULL) {
                *byteswritten=0;
        }
        
        if(!(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        if (lock_while_writing) {
                /* Need to lock the region we're about to write to,
                 * because we only do advisory locking on POSIX
                 * systems
                 */
                current_pos = lseek (fd, (off_t)0, SEEK_CUR);
                if (current_pos == -1) {
                        DEBUG ("%s: handle %p lseek failed: %s", __func__,
                                   handle, strerror (errno));
                        _wapi_set_last_error_from_errno ();
                        return(FALSE);
                }
                
                if (_wapi_lock_file_region (fd, current_pos,
                                            numbytes) == FALSE) {
                        /* The error has already been set */
                        return(FALSE);
                }
        }
                
        do {
                ret = write (fd, buffer, numbytes);
        } while (ret == -1 && errno == EINTR &&
                 !_wapi_thread_cur_apc_pending());
        
        if (lock_while_writing) {
                _wapi_unlock_file_region (fd, current_pos, numbytes);
        }

        if (ret == -1) {
                if (errno == EINTR) {
                        ret = 0;
                } else {
                        _wapi_set_last_error_from_errno ();
                                
                        DEBUG("%s: write of handle %p error: %s",
                                  __func__, handle, strerror(errno));

                        return(FALSE);
                }
        }
        if (byteswritten != NULL) {
                *byteswritten = ret;
        }
        return(TRUE);
}

static gboolean file_flush(gpointer handle)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }

        fd = file_handle->fd;

        if(!(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }

        ret=fsync(fd);
        if (ret==-1) {
                DEBUG("%s: fsync of handle %p error: %s", __func__, handle,
                          strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }
        
        return(TRUE);
}

static guint32 file_seek(gpointer handle, gint32 movedistance,
                         gint32 *highmovedistance, WapiSeekMethod method)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        gint64 offset, newpos;
        int whence, fd;
        guint32 ret;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(INVALID_SET_FILE_POINTER);
        }
        
        fd = file_handle->fd;

        if(!(file_handle->fileaccess & GENERIC_READ) &&
           !(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG ("%s: handle %p doesn't have GENERIC_READ or GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(INVALID_SET_FILE_POINTER);
        }

        switch(method) {
        case FILE_BEGIN:
                whence=SEEK_SET;
                break;
        case FILE_CURRENT:
                whence=SEEK_CUR;
                break;
        case FILE_END:
                whence=SEEK_END;
                break;
        default:
                DEBUG("%s: invalid seek type %d", __func__, method);

                SetLastError (ERROR_INVALID_PARAMETER);
                return(INVALID_SET_FILE_POINTER);
        }

#ifdef HAVE_LARGE_FILE_SUPPORT
        if(highmovedistance==NULL) {
                offset=movedistance;
                DEBUG("%s: setting offset to %lld (low %d)", __func__,
                          offset, movedistance);
        } else {
                offset=((gint64) *highmovedistance << 32) | (guint32)movedistance;
                
                DEBUG("%s: setting offset to %lld 0x%llx (high %d 0x%x, low %d 0x%x)", __func__, offset, offset, *highmovedistance, *highmovedistance, movedistance, movedistance);
        }
#else
        offset=movedistance;
#endif

        DEBUG ("%s: moving handle %p by %lld bytes from %d", __func__,
                   handle, (long long)offset, whence);

#ifdef PLATFORM_ANDROID
        /* bionic doesn't support -D_FILE_OFFSET_BITS=64 */
        newpos=lseek64(fd, offset, whence);
#else
        newpos=lseek(fd, offset, whence);
#endif
        if(newpos==-1) {
                DEBUG("%s: lseek on handle %p returned error %s",
                          __func__, handle, strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(INVALID_SET_FILE_POINTER);
        }

        DEBUG ("%s: lseek returns %lld", __func__, newpos);

#ifdef HAVE_LARGE_FILE_SUPPORT
        ret=newpos & 0xFFFFFFFF;
        if(highmovedistance!=NULL) {
                *highmovedistance=newpos>>32;
        }
#else
        ret=newpos;
        if(highmovedistance!=NULL) {
                /* Accurate, but potentially dodgy :-) */
                *highmovedistance=0;
        }
#endif

        DEBUG ("%s: move of handle %p returning %d/%d", __func__,
                   handle, ret, highmovedistance==NULL?0:*highmovedistance);

        return(ret);
}

static gboolean file_setendoffile(gpointer handle)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        struct stat statbuf;
        off_t size, pos;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = file_handle->fd;
        
        if(!(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }

        /* Find the current file position, and the file length.  If
         * the file position is greater than the length, write to
         * extend the file with a hole.  If the file position is less
         * than the length, truncate the file.
         */
        
        ret=fstat(fd, &statbuf);
        if(ret==-1) {
                DEBUG ("%s: handle %p fstat failed: %s", __func__,
                           handle, strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }
        size=statbuf.st_size;

        pos=lseek(fd, (off_t)0, SEEK_CUR);
        if(pos==-1) {
                DEBUG("%s: handle %p lseek failed: %s", __func__,
                          handle, strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }
        
#ifdef FTRUNCATE_DOESNT_EXTEND
        /* I haven't bothered to write the configure.ac stuff for this
         * because I don't know if any platform needs it.  I'm leaving
         * this code just in case though
         */
        if(pos>size) {
                /* Extend the file.  Use write() here, because some
                 * manuals say that ftruncate() behaviour is undefined
                 * when the file needs extending.  The POSIX spec says
                 * that on XSI-conformant systems it extends, so if
                 * every system we care about conforms, then we can
                 * drop this write.
                 */
                do {
                        ret = write (fd, "", 1);
                } while (ret == -1 && errno == EINTR &&
                         !_wapi_thread_cur_apc_pending());

                if(ret==-1) {
                        DEBUG("%s: handle %p extend write failed: %s", __func__, handle, strerror(errno));

                        _wapi_set_last_error_from_errno ();
                        return(FALSE);
                }

                /* And put the file position back after the write */
                ret = lseek (fd, pos, SEEK_SET);
                if (ret == -1) {
                        DEBUG ("%s: handle %p second lseek failed: %s",
                                   __func__, handle, strerror(errno));

                        _wapi_set_last_error_from_errno ();
                        return(FALSE);
                }
        }
#endif

/* Native Client has no ftruncate function, even in standalone sel_ldr. */
#ifndef __native_client__
        /* always truncate, because the extend write() adds an extra
         * byte to the end of the file
         */
        do {
                ret=ftruncate(fd, pos);
        }
        while (ret==-1 && errno==EINTR && !_wapi_thread_cur_apc_pending()); 
        if(ret==-1) {
                DEBUG("%s: handle %p ftruncate failed: %s", __func__,
                          handle, strerror(errno));
                
                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }
#endif
                
        return(TRUE);
}

static guint32 file_getfilesize(gpointer handle, guint32 *highsize)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        struct stat statbuf;
        guint32 size;
        int ret;
        int fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(INVALID_FILE_SIZE);
        }
        fd = file_handle->fd;
        
        if(!(file_handle->fileaccess & GENERIC_READ) &&
           !(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_READ or GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(INVALID_FILE_SIZE);
        }

        /* If the file has a size with the low bits 0xFFFFFFFF the
         * caller can't tell if this is an error, so clear the error
         * value
         */
        SetLastError (ERROR_SUCCESS);
        
        ret = fstat(fd, &statbuf);
        if (ret == -1) {
                DEBUG ("%s: handle %p fstat failed: %s", __func__,
                           handle, strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(INVALID_FILE_SIZE);
        }
        
        /* fstat indicates block devices as zero-length, so go a different path */
#ifdef BLKGETSIZE64
        if (S_ISBLK(statbuf.st_mode)) {
                guint64 bigsize;
                if (ioctl(fd, BLKGETSIZE64, &bigsize) < 0) {
                        DEBUG ("%s: handle %p ioctl BLKGETSIZE64 failed: %s",
                                   __func__, handle, strerror(errno));

                        _wapi_set_last_error_from_errno ();
                        return(INVALID_FILE_SIZE);
                }
                
                size = bigsize & 0xFFFFFFFF;
                if (highsize != NULL) {
                        *highsize = bigsize>>32;
                }

                DEBUG ("%s: Returning block device size %d/%d",
                           __func__, size, *highsize);
        
                return(size);
        }
#endif
        
#ifdef HAVE_LARGE_FILE_SUPPORT
        size = statbuf.st_size & 0xFFFFFFFF;
        if (highsize != NULL) {
                *highsize = statbuf.st_size>>32;
        }
#else
        if (highsize != NULL) {
                /* Accurate, but potentially dodgy :-) */
                *highsize = 0;
        }
        size = statbuf.st_size;
#endif

        DEBUG ("%s: Returning size %d/%d", __func__, size, *highsize);
        
        return(size);
}

static gboolean file_getfiletime(gpointer handle, WapiFileTime *create_time,
                                 WapiFileTime *last_access,
                                 WapiFileTime *last_write)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        struct stat statbuf;
        guint64 create_ticks, access_ticks, write_ticks;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = file_handle->fd;

        if(!(file_handle->fileaccess & GENERIC_READ) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_READ access: %u",
                          __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        ret=fstat(fd, &statbuf);
        if(ret==-1) {
                DEBUG("%s: handle %p fstat failed: %s", __func__, handle,
                          strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }

        DEBUG("%s: atime: %ld ctime: %ld mtime: %ld", __func__,
                  statbuf.st_atime, statbuf.st_ctime,
                  statbuf.st_mtime);

        /* Try and guess a meaningful create time by using the older
         * of atime or ctime
         */
        /* The magic constant comes from msdn documentation
         * "Converting a time_t Value to a File Time"
         */
        if(statbuf.st_atime < statbuf.st_ctime) {
                create_ticks=((guint64)statbuf.st_atime*10000000)
                        + 116444736000000000ULL;
        } else {
                create_ticks=((guint64)statbuf.st_ctime*10000000)
                        + 116444736000000000ULL;
        }
        
        access_ticks=((guint64)statbuf.st_atime*10000000)+116444736000000000ULL;
        write_ticks=((guint64)statbuf.st_mtime*10000000)+116444736000000000ULL;
        
        DEBUG("%s: aticks: %llu cticks: %llu wticks: %llu", __func__,
                  access_ticks, create_ticks, write_ticks);

        if(create_time!=NULL) {
                create_time->dwLowDateTime = create_ticks & 0xFFFFFFFF;
                create_time->dwHighDateTime = create_ticks >> 32;
        }
        
        if(last_access!=NULL) {
                last_access->dwLowDateTime = access_ticks & 0xFFFFFFFF;
                last_access->dwHighDateTime = access_ticks >> 32;
        }
        
        if(last_write!=NULL) {
                last_write->dwLowDateTime = write_ticks & 0xFFFFFFFF;
                last_write->dwHighDateTime = write_ticks >> 32;
        }

        return(TRUE);
}

static gboolean file_setfiletime(gpointer handle,
                                 const WapiFileTime *create_time G_GNUC_UNUSED,
                                 const WapiFileTime *last_access,
                                 const WapiFileTime *last_write)
{
        struct _WapiHandle_file *file_handle;
        gboolean ok;
        struct utimbuf utbuf;
        struct stat statbuf;
        guint64 access_ticks, write_ticks;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FILE,
                                (gpointer *)&file_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up file handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = file_handle->fd;
        
        if(!(file_handle->fileaccess & GENERIC_WRITE) &&
           !(file_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, file_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }

        if(file_handle->filename == NULL) {
                DEBUG("%s: handle %p unknown filename", __func__, handle);

                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        /* Get the current times, so we can put the same times back in
         * the event that one of the FileTime structs is NULL
         */
        ret=fstat (fd, &statbuf);
        if(ret==-1) {
                DEBUG("%s: handle %p fstat failed: %s", __func__, handle,
                          strerror(errno));

                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }

        if(last_access!=NULL) {
                access_ticks=((guint64)last_access->dwHighDateTime << 32) +
                        last_access->dwLowDateTime;
                /* This is (time_t)0.  We can actually go to INT_MIN,
                 * but this will do for now.
                 */
                if (access_ticks < 116444736000000000ULL) {
                        DEBUG ("%s: attempt to set access time too early",
                                   __func__);
                        SetLastError (ERROR_INVALID_PARAMETER);
                        return(FALSE);
                }
                
                utbuf.actime=(access_ticks - 116444736000000000ULL) / 10000000;
        } else {
                utbuf.actime=statbuf.st_atime;
        }

        if(last_write!=NULL) {
                write_ticks=((guint64)last_write->dwHighDateTime << 32) +
                        last_write->dwLowDateTime;
                /* This is (time_t)0.  We can actually go to INT_MIN,
                 * but this will do for now.
                 */
                if (write_ticks < 116444736000000000ULL) {
                        DEBUG ("%s: attempt to set write time too early",
                                   __func__);
                        SetLastError (ERROR_INVALID_PARAMETER);
                        return(FALSE);
                }
                
                utbuf.modtime=(write_ticks - 116444736000000000ULL) / 10000000;
        } else {
                utbuf.modtime=statbuf.st_mtime;
        }

        DEBUG ("%s: setting handle %p access %ld write %ld", __func__,
                   handle, utbuf.actime, utbuf.modtime);

        ret = _wapi_utime (file_handle->filename, &utbuf);
        if (ret == -1) {
                DEBUG ("%s: handle %p [%s] utime failed: %s", __func__,
                           handle, file_handle->filename, strerror(errno));

                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }
        
        return(TRUE);
}

static void console_close (gpointer handle, gpointer data)
{
        struct _WapiHandle_file *console_handle = (struct _WapiHandle_file *)data;
        int fd = console_handle->fd;
        
        DEBUG("%s: closing console handle %p", __func__, handle);

        g_free (console_handle->filename);

        if (fd > 2)
                close (fd);
}

static WapiFileType console_getfiletype(void)
{
        return(FILE_TYPE_CHAR);
}

static gboolean console_read(gpointer handle, gpointer buffer,
                             guint32 numbytes, guint32 *bytesread,
                             WapiOverlapped *overlapped G_GNUC_UNUSED)
{
        struct _WapiHandle_file *console_handle;
        gboolean ok;
        int ret, fd;

        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_CONSOLE,
                                (gpointer *)&console_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up console handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = console_handle->fd;
        
        if(bytesread!=NULL) {
                *bytesread=0;
        }
        
        if(!(console_handle->fileaccess & GENERIC_READ) &&
           !(console_handle->fileaccess & GENERIC_ALL)) {
                DEBUG ("%s: handle %p doesn't have GENERIC_READ access: %u",
                           __func__, handle, console_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        do {
                ret=read(fd, buffer, numbytes);
        } while (ret==-1 && errno==EINTR && !_wapi_thread_cur_apc_pending());

        if(ret==-1) {
                DEBUG("%s: read of handle %p error: %s", __func__, handle,
                          strerror(errno));

                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }
        
        if(bytesread!=NULL) {
                *bytesread=ret;
        }
        
        return(TRUE);
}

static gboolean console_write(gpointer handle, gconstpointer buffer,
                              guint32 numbytes, guint32 *byteswritten,
                              WapiOverlapped *overlapped G_GNUC_UNUSED)
{
        struct _WapiHandle_file *console_handle;
        gboolean ok;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_CONSOLE,
                                (gpointer *)&console_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up console handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = console_handle->fd;
        
        if(byteswritten!=NULL) {
                *byteswritten=0;
        }
        
        if(!(console_handle->fileaccess & GENERIC_WRITE) &&
           !(console_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, console_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        do {
                ret = write(fd, buffer, numbytes);
        } while (ret == -1 && errno == EINTR &&
                 !_wapi_thread_cur_apc_pending());

        if (ret == -1) {
                if (errno == EINTR) {
                        ret = 0;
                } else {
                        _wapi_set_last_error_from_errno ();
                        
                        DEBUG ("%s: write of handle %p error: %s",
                                   __func__, handle, strerror(errno));

                        return(FALSE);
                }
        }
        if(byteswritten!=NULL) {
                *byteswritten=ret;
        }
        
        return(TRUE);
}

static void pipe_close (gpointer handle, gpointer data)
{
        struct _WapiHandle_file *pipe_handle = (struct _WapiHandle_file*)data;
        int fd = pipe_handle->fd;

        DEBUG("%s: closing pipe handle %p", __func__, handle);

        /* No filename with pipe handles */

        close (fd);
}

static WapiFileType pipe_getfiletype(void)
{
        return(FILE_TYPE_PIPE);
}

static gboolean pipe_read (gpointer handle, gpointer buffer,
                           guint32 numbytes, guint32 *bytesread,
                           WapiOverlapped *overlapped G_GNUC_UNUSED)
{
        struct _WapiHandle_file *pipe_handle;
        gboolean ok;
        int ret, fd;

        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_PIPE,
                                (gpointer *)&pipe_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up pipe handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = pipe_handle->fd;

        if(bytesread!=NULL) {
                *bytesread=0;
        }
        
        if(!(pipe_handle->fileaccess & GENERIC_READ) &&
           !(pipe_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_READ access: %u",
                          __func__, handle, pipe_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        DEBUG ("%s: reading up to %d bytes from pipe %p", __func__,
                   numbytes, handle);

        do {
                ret=read(fd, buffer, numbytes);
        } while (ret==-1 && errno==EINTR && !_wapi_thread_cur_apc_pending());
                
        if (ret == -1) {
                if (errno == EINTR) {
                        ret = 0;
                } else {
                        _wapi_set_last_error_from_errno ();
                        
                        DEBUG("%s: read of handle %p error: %s", __func__,
                                  handle, strerror(errno));

                        return(FALSE);
                }
        }
        
        DEBUG ("%s: read %d bytes from pipe", __func__, ret);

        if(bytesread!=NULL) {
                *bytesread=ret;
        }
        
        return(TRUE);
}

static gboolean pipe_write(gpointer handle, gconstpointer buffer,
                           guint32 numbytes, guint32 *byteswritten,
                           WapiOverlapped *overlapped G_GNUC_UNUSED)
{
        struct _WapiHandle_file *pipe_handle;
        gboolean ok;
        int ret, fd;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_PIPE,
                                (gpointer *)&pipe_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up pipe handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        fd = pipe_handle->fd;
        
        if(byteswritten!=NULL) {
                *byteswritten=0;
        }
        
        if(!(pipe_handle->fileaccess & GENERIC_WRITE) &&
           !(pipe_handle->fileaccess & GENERIC_ALL)) {
                DEBUG("%s: handle %p doesn't have GENERIC_WRITE access: %u", __func__, handle, pipe_handle->fileaccess);

                SetLastError (ERROR_ACCESS_DENIED);
                return(FALSE);
        }
        
        DEBUG ("%s: writing up to %d bytes to pipe %p", __func__, numbytes,
                   handle);

        do {
                ret = write (fd, buffer, numbytes);
        } while (ret == -1 && errno == EINTR &&
                 !_wapi_thread_cur_apc_pending());

        if (ret == -1) {
                if (errno == EINTR) {
                        ret = 0;
                } else {
                        _wapi_set_last_error_from_errno ();
                        
                        DEBUG("%s: write of handle %p error: %s", __func__,
                                  handle, strerror(errno));

                        return(FALSE);
                }
        }
        if(byteswritten!=NULL) {
                *byteswritten=ret;
        }
        
        return(TRUE);
}

static int convert_flags(guint32 fileaccess, guint32 createmode)
{
        int flags=0;
        
        switch(fileaccess) {
        case GENERIC_READ:
                flags=O_RDONLY;
                break;
        case GENERIC_WRITE:
                flags=O_WRONLY;
                break;
        case GENERIC_READ|GENERIC_WRITE:
                flags=O_RDWR;
                break;
        default:
                DEBUG("%s: Unknown access type 0x%x", __func__,
                          fileaccess);
                break;
        }

        switch(createmode) {
        case CREATE_NEW:
                flags|=O_CREAT|O_EXCL;
                break;
        case CREATE_ALWAYS:
                flags|=O_CREAT|O_TRUNC;
                break;
        case OPEN_EXISTING:
                break;
        case OPEN_ALWAYS:
                flags|=O_CREAT;
                break;
        case TRUNCATE_EXISTING:
                flags|=O_TRUNC;
                break;
        default:
                DEBUG("%s: Unknown create mode 0x%x", __func__,
                          createmode);
                break;
        }
        
        return(flags);
}

#if 0 /* unused */
static mode_t convert_perms(guint32 sharemode)
{
        mode_t perms=0600;
        
        if(sharemode&FILE_SHARE_READ) {
                perms|=044;
        }
        if(sharemode&FILE_SHARE_WRITE) {
                perms|=022;
        }

        return(perms);
}
#endif

static gboolean share_allows_open (struct stat *statbuf, guint32 sharemode,
                                   guint32 fileaccess,
                                   struct _WapiFileShare **share_info)
{
        gboolean file_already_shared;
        guint32 file_existing_share, file_existing_access;

        file_already_shared = _wapi_handle_get_or_set_share (statbuf->st_dev, statbuf->st_ino, sharemode, fileaccess, &file_existing_share, &file_existing_access, share_info);
        
        if (file_already_shared) {
                /* The reference to this share info was incremented
                 * when we looked it up, so be careful to put it back
                 * if we conclude we can't use this file.
                 */
                if (file_existing_share == 0) {
                        /* Quick and easy, no possibility to share */
                        DEBUG ("%s: Share mode prevents open: requested access: 0x%x, file has sharing = NONE", __func__, fileaccess);

                        _wapi_handle_share_release (*share_info);
                        
                        return(FALSE);
                }

                if (((file_existing_share == FILE_SHARE_READ) &&
                     (fileaccess != GENERIC_READ)) ||
                    ((file_existing_share == FILE_SHARE_WRITE) &&
                     (fileaccess != GENERIC_WRITE))) {
                        /* New access mode doesn't match up */
                        DEBUG ("%s: Share mode prevents open: requested access: 0x%x, file has sharing: 0x%x", __func__, fileaccess, file_existing_share);

                        _wapi_handle_share_release (*share_info);
                
                        return(FALSE);
                }

                if (((file_existing_access & GENERIC_READ) &&
                     !(sharemode & FILE_SHARE_READ)) ||
                    ((file_existing_access & GENERIC_WRITE) &&
                     !(sharemode & FILE_SHARE_WRITE))) {
                        /* New share mode doesn't match up */
                        DEBUG ("%s: Access mode prevents open: requested share: 0x%x, file has access: 0x%x", __func__, sharemode, file_existing_access);

                        _wapi_handle_share_release (*share_info);
                
                        return(FALSE);
                }
        } else {
                DEBUG ("%s: New file!", __func__);
        }

        return(TRUE);
}


static gboolean
share_allows_delete (struct stat *statbuf, struct _WapiFileShare **share_info)
{
        gboolean file_already_shared;
        guint32 file_existing_share, file_existing_access;

        file_already_shared = _wapi_handle_get_or_set_share (statbuf->st_dev, statbuf->st_ino, FILE_SHARE_DELETE, GENERIC_READ, &file_existing_share, &file_existing_access, share_info);

        if (file_already_shared) {
                /* The reference to this share info was incremented
                 * when we looked it up, so be careful to put it back
                 * if we conclude we can't use this file.
                 */
                if (file_existing_share == 0) {
                        /* Quick and easy, no possibility to share */
                        DEBUG ("%s: Share mode prevents open: requested access: 0x%x, file has sharing = NONE", __func__, fileaccess);

                        _wapi_handle_share_release (*share_info);

                        return(FALSE);
                }

                if (!(file_existing_share & FILE_SHARE_DELETE)) {
                        /* New access mode doesn't match up */
                        DEBUG ("%s: Share mode prevents open: requested access: 0x%x, file has sharing: 0x%x", __func__, fileaccess, file_existing_share);

                        _wapi_handle_share_release (*share_info);

                        return(FALSE);
                }
        } else {
                DEBUG ("%s: New file!", __func__);
        }

        return(TRUE);
}
static gboolean share_check (struct stat *statbuf, guint32 sharemode,
                             guint32 fileaccess,
                             struct _WapiFileShare **share_info, int fd)
{
        if (share_allows_open (statbuf, sharemode, fileaccess,
                               share_info) == TRUE) {
                return (TRUE);
        }
        
        /* Got a share violation.  Double check that the file is still
         * open by someone, in case a process crashed while still
         * holding a file handle.  This will also cope with someone
         * using Mono.Posix to close the file.  This is cheaper and
         * less intrusive to other processes than initiating a handle
         * collection.
         */

        _wapi_handle_check_share (*share_info, fd);
        if (share_allows_open (statbuf, sharemode, fileaccess,
                               share_info) == TRUE) {
                return (TRUE);
        }
        
        /* Still violating.  It's possible that a process crashed
         * while still holding a file handle, and that a non-mono
         * process has the file open.  (For example, C-c mcs while
         * editing a source file.)  As a last resort, run a handle
         * collection, which will remove stale share entries.
         */
        _wapi_handle_collect ();

        return(share_allows_open (statbuf, sharemode, fileaccess, share_info));
}

/**
 * CreateFile:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the file or other object to create.
 * @fileaccess: specifies the file access mode
 * @sharemode: whether the file should be shared.  This parameter is
 * currently ignored.
 * @security: Ignored for now.
 * @createmode: specifies whether to create a new file, whether to
 * overwrite an existing file, whether to truncate the file, etc.
 * @attrs: specifies file attributes and flags.  On win32 attributes
 * are characteristics of the file, not the handle, and are ignored
 * when an existing file is opened.  Flags give the library hints on
 * how to process a file to optimise performance.
 * @template: the handle of an open %GENERIC_READ file that specifies
 * attributes to apply to a newly created file, ignoring @attrs.
 * Normally this parameter is NULL.  This parameter is ignored when an
 * existing file is opened.
 *
 * Creates a new file handle.  This only applies to normal files:
 * pipes are handled by CreatePipe(), and console handles are created
 * with GetStdHandle().
 *
 * Return value: the new handle, or %INVALID_HANDLE_VALUE on error.
 */
gpointer CreateFile(const gunichar2 *name, guint32 fileaccess,
                    guint32 sharemode, WapiSecurityAttributes *security,
                    guint32 createmode, guint32 attrs,
                    gpointer template G_GNUC_UNUSED)
{
        struct _WapiHandle_file file_handle = {0};
        gpointer handle;
        int flags=convert_flags(fileaccess, createmode);
        /*mode_t perms=convert_perms(sharemode);*/
        /* we don't use sharemode, because that relates to sharing of
         * the file when the file is open and is already handled by
         * other code, perms instead are the on-disk permissions and
         * this is a sane default.
         */
        mode_t perms=0666;
        gchar *filename;
        int fd, ret;
        int handle_type;
        struct stat statbuf;
        
        mono_once (&io_ops_once, io_ops_init);

        if (attrs & FILE_ATTRIBUTE_TEMPORARY)
                perms = 0600;
        
        if (attrs & FILE_ATTRIBUTE_ENCRYPTED){
                SetLastError (ERROR_ENCRYPTION_FAILED);
                return INVALID_HANDLE_VALUE;
        }
        
        if (name == NULL) {
                DEBUG ("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(INVALID_HANDLE_VALUE);
        }

        filename = mono_unicode_to_external (name);
        if (filename == NULL) {
                DEBUG("%s: unicode conversion returned NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(INVALID_HANDLE_VALUE);
        }
        
        DEBUG ("%s: Opening %s with share 0x%x and access 0x%x", __func__,
                   filename, sharemode, fileaccess);
        
        fd = _wapi_open (filename, flags, perms);
    
        /* If we were trying to open a directory with write permissions
         * (e.g. O_WRONLY or O_RDWR), this call will fail with
         * EISDIR. However, this is a bit bogus because calls to
         * manipulate the directory (e.g. SetFileTime) will still work on
         * the directory because they use other API calls
         * (e.g. utime()). Hence, if we failed with the EISDIR error, try
         * to open the directory again without write permission.
         */
        if (fd == -1 && errno == EISDIR)
        {
                /* Try again but don't try to make it writable */
                fd = _wapi_open (filename, flags & ~(O_RDWR|O_WRONLY), perms);
        }
        
        if (fd == -1) {
                DEBUG("%s: Error opening file %s: %s", __func__, filename,
                          strerror(errno));
                _wapi_set_last_path_error_from_errno (NULL, filename);
                g_free (filename);

                return(INVALID_HANDLE_VALUE);
        }

        if (fd >= _wapi_fd_reserve) {
                DEBUG ("%s: File descriptor is too big", __func__);

                SetLastError (ERROR_TOO_MANY_OPEN_FILES);
                
                close (fd);
                g_free (filename);
                
                return(INVALID_HANDLE_VALUE);
        }

        ret = fstat (fd, &statbuf);
        if (ret == -1) {
                DEBUG ("%s: fstat error of file %s: %s", __func__,
                           filename, strerror (errno));
                _wapi_set_last_error_from_errno ();
                g_free (filename);
                close (fd);
                
                return(INVALID_HANDLE_VALUE);
        }
#ifdef __native_client__
        /* Workaround: Native Client currently returns the same fake inode
         * for all files, so do a simple hash on the filename so we don't
         * use the same share info for each file.
         */
        statbuf.st_ino = g_str_hash(filename);
#endif

        if (share_check (&statbuf, sharemode, fileaccess,
                         &file_handle.share_info, fd) == FALSE) {
                SetLastError (ERROR_SHARING_VIOLATION);
                g_free (filename);
                close (fd);
                
                return (INVALID_HANDLE_VALUE);
        }
        if (file_handle.share_info == NULL) {
                /* No space, so no more files can be opened */
                DEBUG ("%s: No space in the share table", __func__);

                SetLastError (ERROR_TOO_MANY_OPEN_FILES);
                close (fd);
                g_free (filename);
                
                return(INVALID_HANDLE_VALUE);
        }
        
        file_handle.filename = filename;

        if(security!=NULL) {
                //file_handle->security_attributes=_wapi_handle_scratch_store (
                //security, sizeof(WapiSecurityAttributes));
        }
        
        file_handle.fd = fd;
        file_handle.fileaccess=fileaccess;
        file_handle.sharemode=sharemode;
        file_handle.attrs=attrs;

#ifdef HAVE_POSIX_FADVISE
        if (attrs & FILE_FLAG_SEQUENTIAL_SCAN)
                posix_fadvise (fd, 0, 0, POSIX_FADV_SEQUENTIAL);
        if (attrs & FILE_FLAG_RANDOM_ACCESS)
                posix_fadvise (fd, 0, 0, POSIX_FADV_RANDOM);
#endif
        
#ifndef S_ISFIFO
#define S_ISFIFO(m) ((m & S_IFIFO) != 0)
#endif
        if (S_ISFIFO (statbuf.st_mode)) {
                handle_type = WAPI_HANDLE_PIPE;
        } else if (S_ISCHR (statbuf.st_mode)) {
                handle_type = WAPI_HANDLE_CONSOLE;
        } else {
                handle_type = WAPI_HANDLE_FILE;
        }

        handle = _wapi_handle_new_fd (handle_type, fd, &file_handle);
        if (handle == _WAPI_HANDLE_INVALID) {
                g_warning ("%s: error creating file handle", __func__);
                g_free (filename);
                close (fd);
                
                SetLastError (ERROR_GEN_FAILURE);
                return(INVALID_HANDLE_VALUE);
        }
        
        DEBUG("%s: returning handle %p", __func__, handle);
        
        return(handle);
}

/**
 * DeleteFile:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the file to be deleted.
 *
 * Deletes file @name.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean DeleteFile(const gunichar2 *name)
{
        gchar *filename;
        int retval;
        gboolean ret = FALSE;
        guint32 attrs;
#if 0
        struct stat statbuf;
        struct _WapiFileShare *shareinfo;
#endif
        
        if(name==NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        filename=mono_unicode_to_external(name);
        if(filename==NULL) {
                DEBUG("%s: unicode conversion returned NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        attrs = GetFileAttributes (name);
        if (attrs == INVALID_FILE_ATTRIBUTES) {
                DEBUG ("%s: file attributes error", __func__);
                /* Error set by GetFileAttributes() */
                g_free (filename);
                return(FALSE);
        }

#if 0
        /* Check to make sure sharing allows us to open the file for
         * writing.  See bug 323389.
         *
         * Do the checks that don't need an open file descriptor, for
         * simplicity's sake.  If we really have to do the full checks
         * then we can implement that later.
         */
        if (_wapi_stat (filename, &statbuf) < 0) {
                _wapi_set_last_path_error_from_errno (NULL, filename);
                g_free (filename);
                return(FALSE);
        }
        
        if (share_allows_open (&statbuf, 0, GENERIC_WRITE,
                               &shareinfo) == FALSE) {
                SetLastError (ERROR_SHARING_VIOLATION);
                g_free (filename);
                return FALSE;
        }
        if (shareinfo)
                _wapi_handle_share_release (shareinfo);
#endif

        retval = _wapi_unlink (filename);
        
        if (retval == -1) {
                _wapi_set_last_path_error_from_errno (NULL, filename);
        } else {
                ret = TRUE;
        }

        g_free(filename);

        return(ret);
}

/**
 * MoveFile:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the file to be moved.
 * @dest_name: a pointer to a NULL-terminated unicode string, that is the
 * new name for the file.
 *
 * Renames file @name to @dest_name.
 * MoveFile sets ERROR_ALREADY_EXISTS if the destination exists, except
 * when it is the same file as the source.  In that case it silently succeeds.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean MoveFile (const gunichar2 *name, const gunichar2 *dest_name)
{
        gchar *utf8_name, *utf8_dest_name;
        int result, errno_copy;
        struct stat stat_src, stat_dest;
        gboolean ret = FALSE;
        struct _WapiFileShare *shareinfo;
        
        if(name==NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);
                
                SetLastError (ERROR_INVALID_NAME);
                return FALSE;
        }
        
        if(dest_name==NULL) {
                DEBUG("%s: name is NULL", __func__);

                g_free (utf8_name);
                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        utf8_dest_name = mono_unicode_to_external (dest_name);
        if (utf8_dest_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);

                g_free (utf8_name);
                SetLastError (ERROR_INVALID_NAME);
                return FALSE;
        }

        /*
         * In C# land we check for the existence of src, but not for dest.
         * We check it here and return the failure if dest exists and is not
         * the same file as src.
         */
        if (_wapi_stat (utf8_name, &stat_src) < 0) {
                if (errno != ENOENT || _wapi_lstat (utf8_name, &stat_src) < 0) {
                        _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                        g_free (utf8_name);
                        g_free (utf8_dest_name);
                        return FALSE;
                }
        }
        
        if (!_wapi_stat (utf8_dest_name, &stat_dest)) {
                if (stat_dest.st_dev != stat_src.st_dev ||
                    stat_dest.st_ino != stat_src.st_ino) {
                        g_free (utf8_name);
                        g_free (utf8_dest_name);
                        SetLastError (ERROR_ALREADY_EXISTS);
                        return FALSE;
                }
        }

        /* Check to make that we have delete sharing permission.
         * See https://bugzilla.xamarin.com/show_bug.cgi?id=17009
         *
         * Do the checks that don't need an open file descriptor, for
         * simplicity's sake.  If we really have to do the full checks
         * then we can implement that later.
         */
        if (share_allows_delete (&stat_src, &shareinfo) == FALSE) {
                SetLastError (ERROR_SHARING_VIOLATION);
                return FALSE;
        }
        if (shareinfo)
                _wapi_handle_share_release (shareinfo);

        result = _wapi_rename (utf8_name, utf8_dest_name);
        errno_copy = errno;
        
        if (result == -1) {
                switch(errno_copy) {
                case EEXIST:
                        SetLastError (ERROR_ALREADY_EXISTS);
                        break;

                case EXDEV:
                        /* Ignore here, it is dealt with below */
                        break;
                        
                default:
                        _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                }
        }
        
        g_free (utf8_name);
        g_free (utf8_dest_name);

        if (result != 0 && errno_copy == EXDEV) {
                if (S_ISDIR (stat_src.st_mode)) {
                        SetLastError (ERROR_NOT_SAME_DEVICE);
                        return FALSE;
                }
                /* Try a copy to the new location, and delete the source */
                if (CopyFile (name, dest_name, TRUE)==FALSE) {
                        /* CopyFile will set the error */
                        return(FALSE);
                }
                
                return(DeleteFile (name));
        }

        if (result == 0) {
                ret = TRUE;
        }

        return(ret);
}

static gboolean
write_file (int src_fd, int dest_fd, struct stat *st_src, gboolean report_errors)
{
        int remain, n;
        char *buf, *wbuf;
        int buf_size = st_src->st_blksize;

        buf_size = buf_size < 8192 ? 8192 : (buf_size > 65536 ? 65536 : buf_size);
        buf = (char *) malloc (buf_size);

        for (;;) {
                remain = read (src_fd, buf, buf_size);
                if (remain < 0) {
                        if (errno == EINTR && !_wapi_thread_cur_apc_pending ())
                                continue;

                        if (report_errors)
                                _wapi_set_last_error_from_errno ();

                        free (buf);
                        return FALSE;
                }
                if (remain == 0) {
                        break;
                }

                wbuf = buf;
                while (remain > 0) {
                        if ((n = write (dest_fd, wbuf, remain)) < 0) {
                                if (errno == EINTR && !_wapi_thread_cur_apc_pending ())
                                        continue;

                                if (report_errors)
                                        _wapi_set_last_error_from_errno ();
                                DEBUG ("%s: write failed.", __func__);
                                free (buf);
                                return FALSE;
                        }

                        remain -= n;
                        wbuf += n;
                }
        }

        free (buf);
        return TRUE ;
}

/**
 * CopyFile:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the file to be copied.
 * @dest_name: a pointer to a NULL-terminated unicode string, that is the
 * new name for the file.
 * @fail_if_exists: if TRUE and dest_name exists, the copy will fail.
 *
 * Copies file @name to @dest_name
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean CopyFile (const gunichar2 *name, const gunichar2 *dest_name,
                   gboolean fail_if_exists)
{
        gchar *utf8_src, *utf8_dest;
        int src_fd, dest_fd;
        struct stat st, dest_st;
        struct utimbuf dest_time;
        gboolean ret = TRUE;
        int ret_utime;
        
        if(name==NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }
        
        utf8_src = mono_unicode_to_external (name);
        if (utf8_src == NULL) {
                DEBUG ("%s: unicode conversion of source returned NULL",
                           __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }
        
        if(dest_name==NULL) {
                DEBUG("%s: dest is NULL", __func__);

                g_free (utf8_src);
                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }
        
        utf8_dest = mono_unicode_to_external (dest_name);
        if (utf8_dest == NULL) {
                DEBUG ("%s: unicode conversion of dest returned NULL",
                           __func__);

                SetLastError (ERROR_INVALID_PARAMETER);

                g_free (utf8_src);
                
                return(FALSE);
        }
        
        src_fd = _wapi_open (utf8_src, O_RDONLY, 0);
        if (src_fd < 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_src);
                
                g_free (utf8_src);
                g_free (utf8_dest);
                
                return(FALSE);
        }

        if (fstat (src_fd, &st) < 0) {
                _wapi_set_last_error_from_errno ();

                g_free (utf8_src);
                g_free (utf8_dest);
                close (src_fd);
                
                return(FALSE);
        }

        /* Before trying to open/create the dest, we need to report a 'file busy'
         * error if src and dest are actually the same file. We do the check here to take
         * advantage of the IOMAP capability */
        if (!_wapi_stat (utf8_dest, &dest_st) && st.st_dev == dest_st.st_dev && 
                        st.st_ino == dest_st.st_ino) {

                g_free (utf8_src);
                g_free (utf8_dest);
                close (src_fd);

                SetLastError (ERROR_SHARING_VIOLATION);
                return (FALSE);
        }
        
        if (fail_if_exists) {
                dest_fd = _wapi_open (utf8_dest, O_WRONLY | O_CREAT | O_EXCL, st.st_mode);
        } else {
                /* FIXME: it kinda sucks that this code path potentially scans
                 * the directory twice due to the weird SetLastError()
                 * behavior. */
                dest_fd = _wapi_open (utf8_dest, O_WRONLY | O_TRUNC, st.st_mode);
                if (dest_fd < 0) {
                        /* The file does not exist, try creating it */
                        dest_fd = _wapi_open (utf8_dest, O_WRONLY | O_CREAT | O_TRUNC, st.st_mode);
                } else {
                        /* Apparently this error is set if we
                         * overwrite the dest file
                         */
                        SetLastError (ERROR_ALREADY_EXISTS);
                }
        }
        if (dest_fd < 0) {
                _wapi_set_last_error_from_errno ();

                g_free (utf8_src);
                g_free (utf8_dest);
                close (src_fd);

                return(FALSE);
        }

        if (!write_file (src_fd, dest_fd, &st, TRUE))
                ret = FALSE;

        close (src_fd);
        close (dest_fd);
        
        dest_time.modtime = st.st_mtime;
        dest_time.actime = st.st_atime;
        ret_utime = utime (utf8_dest, &dest_time);
        if (ret_utime == -1)
                DEBUG ("%s: file [%s] utime failed: %s", __func__, utf8_dest, strerror(errno));
        
        g_free (utf8_src);
        g_free (utf8_dest);

        return ret;
}

static gchar*
convert_arg_to_utf8 (const gunichar2 *arg, const gchar *arg_name)
{
        gchar *utf8_ret;

        if (arg == NULL) {
                DEBUG ("%s: %s is NULL", __func__, arg_name);
                SetLastError (ERROR_INVALID_NAME);
                return NULL;
        }

        utf8_ret = mono_unicode_to_external (arg);
        if (utf8_ret == NULL) {
                DEBUG ("%s: unicode conversion of %s returned NULL",
                           __func__, arg_name);
                SetLastError (ERROR_INVALID_PARAMETER);
                return NULL;
        }

        return utf8_ret;
}

gboolean
ReplaceFile (const gunichar2 *replacedFileName, const gunichar2 *replacementFileName,
                      const gunichar2 *backupFileName, guint32 replaceFlags, 
                      gpointer exclude, gpointer reserved)
{
        int result, backup_fd = -1,replaced_fd = -1;
        gchar *utf8_replacedFileName, *utf8_replacementFileName = NULL, *utf8_backupFileName = NULL;
        struct stat stBackup;
        gboolean ret = FALSE;

        if (!(utf8_replacedFileName = convert_arg_to_utf8 (replacedFileName, "replacedFileName")))
                return FALSE;
        if (!(utf8_replacementFileName = convert_arg_to_utf8 (replacementFileName, "replacementFileName")))
                goto replace_cleanup;
        if (backupFileName != NULL) {
                if (!(utf8_backupFileName = convert_arg_to_utf8 (backupFileName, "backupFileName")))
                        goto replace_cleanup;
        }

        if (utf8_backupFileName) {
                // Open the backup file for read so we can restore the file if an error occurs.
                backup_fd = _wapi_open (utf8_backupFileName, O_RDONLY, 0);
                result = _wapi_rename (utf8_replacedFileName, utf8_backupFileName);
                if (result == -1)
                        goto replace_cleanup;
        }

        result = _wapi_rename (utf8_replacementFileName, utf8_replacedFileName);
        if (result == -1) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_replacementFileName);
                _wapi_rename (utf8_backupFileName, utf8_replacedFileName);
                if (backup_fd != -1 && !fstat (backup_fd, &stBackup)) {
                        replaced_fd = _wapi_open (utf8_backupFileName, O_WRONLY | O_CREAT | O_TRUNC,
                                                  stBackup.st_mode);
                        
                        if (replaced_fd == -1)
                                goto replace_cleanup;

                        write_file (backup_fd, replaced_fd, &stBackup, FALSE);
                }

                goto replace_cleanup;
        }

        ret = TRUE;

replace_cleanup:
        g_free (utf8_replacedFileName);
        g_free (utf8_replacementFileName);
        g_free (utf8_backupFileName);
        if (backup_fd != -1)
                close (backup_fd);
        if (replaced_fd != -1)
                close (replaced_fd);
        return ret;
}

/**
 * GetStdHandle:
 * @stdhandle: specifies the file descriptor
 *
 * Returns a handle for stdin, stdout, or stderr.  Always returns the
 * same handle for the same @stdhandle.
 *
 * Return value: the handle, or %INVALID_HANDLE_VALUE on error
 */

static mono_mutex_t stdhandle_mutex;

gpointer GetStdHandle(WapiStdHandle stdhandle)
{
        struct _WapiHandle_file *file_handle;
        gpointer handle;
        int thr_ret, fd;
        const gchar *name;
        gboolean ok;
        
        switch(stdhandle) {
        case STD_INPUT_HANDLE:
                fd = 0;
                name = "<stdin>";
                break;

        case STD_OUTPUT_HANDLE:
                fd = 1;
                name = "<stdout>";
                break;

        case STD_ERROR_HANDLE:
                fd = 2;
                name = "<stderr>";
                break;

        default:
                DEBUG("%s: unknown standard handle type", __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return(INVALID_HANDLE_VALUE);
        }

        handle = GINT_TO_POINTER (fd);

        thr_ret = mono_mutex_lock (&stdhandle_mutex);
        g_assert (thr_ret == 0);

        ok = _wapi_lookup_handle (handle, WAPI_HANDLE_CONSOLE,
                                  (gpointer *)&file_handle);
        if (ok == FALSE) {
                /* Need to create this console handle */
                handle = _wapi_stdhandle_create (fd, name);
                
                if (handle == INVALID_HANDLE_VALUE) {
                        SetLastError (ERROR_NO_MORE_FILES);
                        goto done;
                }
        } else {
                /* Add a reference to this handle */
                _wapi_handle_ref (handle);
        }
        
  done:
        thr_ret = mono_mutex_unlock (&stdhandle_mutex);
        g_assert (thr_ret == 0);
        
        return(handle);
}

/**
 * ReadFile:
 * @handle: The file handle to read from.  The handle must have
 * %GENERIC_READ access.
 * @buffer: The buffer to store read data in
 * @numbytes: The maximum number of bytes to read
 * @bytesread: The actual number of bytes read is stored here.  This
 * value can be zero if the handle is positioned at the end of the
 * file.
 * @overlapped: points to a required %WapiOverlapped structure if
 * @handle has the %FILE_FLAG_OVERLAPPED option set, should be NULL
 * otherwise.
 *
 * If @handle does not have the %FILE_FLAG_OVERLAPPED option set, this
 * function reads up to @numbytes bytes from the file from the current
 * file position, and stores them in @buffer.  If there are not enough
 * bytes left in the file, just the amount available will be read.
 * The actual number of bytes read is stored in @bytesread.

 * If @handle has the %FILE_FLAG_OVERLAPPED option set, the current
 * file position is ignored and the read position is taken from data
 * in the @overlapped structure.
 *
 * Return value: %TRUE if the read succeeds (even if no bytes were
 * read due to an attempt to read past the end of the file), %FALSE on
 * error.
 */
gboolean ReadFile(gpointer handle, gpointer buffer, guint32 numbytes,
                  guint32 *bytesread, WapiOverlapped *overlapped)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if(io_ops[type].readfile==NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].readfile (handle, buffer, numbytes, bytesread,
                                      overlapped));
}

/**
 * WriteFile:
 * @handle: The file handle to write to.  The handle must have
 * %GENERIC_WRITE access.
 * @buffer: The buffer to read data from.
 * @numbytes: The maximum number of bytes to write.
 * @byteswritten: The actual number of bytes written is stored here.
 * If the handle is positioned at the file end, the length of the file
 * is extended.  This parameter may be %NULL.
 * @overlapped: points to a required %WapiOverlapped structure if
 * @handle has the %FILE_FLAG_OVERLAPPED option set, should be NULL
 * otherwise.
 *
 * If @handle does not have the %FILE_FLAG_OVERLAPPED option set, this
 * function writes up to @numbytes bytes from @buffer to the file at
 * the current file position.  If @handle is positioned at the end of
 * the file, the file is extended.  The actual number of bytes written
 * is stored in @byteswritten.
 *
 * If @handle has the %FILE_FLAG_OVERLAPPED option set, the current
 * file position is ignored and the write position is taken from data
 * in the @overlapped structure.
 *
 * Return value: %TRUE if the write succeeds, %FALSE on error.
 */
gboolean WriteFile(gpointer handle, gconstpointer buffer, guint32 numbytes,
                   guint32 *byteswritten, WapiOverlapped *overlapped)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if(io_ops[type].writefile==NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].writefile (handle, buffer, numbytes, byteswritten,
                                       overlapped));
}

/**
 * FlushFileBuffers:
 * @handle: Handle to open file.  The handle must have
 * %GENERIC_WRITE access.
 *
 * Flushes buffers of the file and causes all unwritten data to
 * be written.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean FlushFileBuffers(gpointer handle)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if(io_ops[type].flushfile==NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].flushfile (handle));
}

/**
 * SetEndOfFile:
 * @handle: The file handle to set.  The handle must have
 * %GENERIC_WRITE access.
 *
 * Moves the end-of-file position to the current position of the file
 * pointer.  This function is used to truncate or extend a file.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean SetEndOfFile(gpointer handle)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].setendoffile == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].setendoffile (handle));
}

/**
 * SetFilePointer:
 * @handle: The file handle to set.  The handle must have
 * %GENERIC_READ or %GENERIC_WRITE access.
 * @movedistance: Low 32 bits of a signed value that specifies the
 * number of bytes to move the file pointer.
 * @highmovedistance: Pointer to the high 32 bits of a signed value
 * that specifies the number of bytes to move the file pointer, or
 * %NULL.
 * @method: The starting point for the file pointer move.
 *
 * Sets the file pointer of an open file.
 *
 * The distance to move the file pointer is calculated from
 * @movedistance and @highmovedistance: If @highmovedistance is %NULL,
 * @movedistance is the 32-bit signed value; otherwise, @movedistance
 * is the low 32 bits and @highmovedistance a pointer to the high 32
 * bits of a 64 bit signed value.  A positive distance moves the file
 * pointer forward from the position specified by @method; a negative
 * distance moves the file pointer backward.
 *
 * If the library is compiled without large file support,
 * @highmovedistance is ignored and its value is set to zero on a
 * successful return.
 *
 * Return value: On success, the low 32 bits of the new file pointer.
 * If @highmovedistance is not %NULL, the high 32 bits of the new file
 * pointer are stored there.  On failure, %INVALID_SET_FILE_POINTER.
 */
guint32 SetFilePointer(gpointer handle, gint32 movedistance,
                       gint32 *highmovedistance, WapiSeekMethod method)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].seek == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(INVALID_SET_FILE_POINTER);
        }
        
        return(io_ops[type].seek (handle, movedistance, highmovedistance,
                                  method));
}

/**
 * GetFileType:
 * @handle: The file handle to test.
 *
 * Finds the type of file @handle.
 *
 * Return value: %FILE_TYPE_UNKNOWN - the type of the file @handle is
 * unknown.  %FILE_TYPE_DISK - @handle is a disk file.
 * %FILE_TYPE_CHAR - @handle is a character device, such as a console.
 * %FILE_TYPE_PIPE - @handle is a named or anonymous pipe.
 */
WapiFileType GetFileType(gpointer handle)
{
        WapiHandleType type;

        if (!_WAPI_PRIVATE_HAVE_SLOT (handle)) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FILE_TYPE_UNKNOWN);
        }

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].getfiletype == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FILE_TYPE_UNKNOWN);
        }
        
        return(io_ops[type].getfiletype ());
}

/**
 * GetFileSize:
 * @handle: The file handle to query.  The handle must have
 * %GENERIC_READ or %GENERIC_WRITE access.
 * @highsize: If non-%NULL, the high 32 bits of the file size are
 * stored here.
 *
 * Retrieves the size of the file @handle.
 *
 * If the library is compiled without large file support, @highsize
 * has its value set to zero on a successful return.
 *
 * Return value: On success, the low 32 bits of the file size.  If
 * @highsize is non-%NULL then the high 32 bits of the file size are
 * stored here.  On failure %INVALID_FILE_SIZE is returned.
 */
guint32 GetFileSize(gpointer handle, guint32 *highsize)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].getfilesize == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(INVALID_FILE_SIZE);
        }
        
        return(io_ops[type].getfilesize (handle, highsize));
}

/**
 * GetFileTime:
 * @handle: The file handle to query.  The handle must have
 * %GENERIC_READ access.
 * @create_time: Points to a %WapiFileTime structure to receive the
 * number of ticks since the epoch that file was created.  May be
 * %NULL.
 * @last_access: Points to a %WapiFileTime structure to receive the
 * number of ticks since the epoch when file was last accessed.  May be
 * %NULL.
 * @last_write: Points to a %WapiFileTime structure to receive the
 * number of ticks since the epoch when file was last written to.  May
 * be %NULL.
 *
 * Finds the number of ticks since the epoch that the file referenced
 * by @handle was created, last accessed and last modified.  A tick is
 * a 100 nanosecond interval.  The epoch is Midnight, January 1 1601
 * GMT.
 *
 * Create time isn't recorded on POSIX file systems or reported by
 * stat(2), so that time is guessed by returning the oldest of the
 * other times.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean GetFileTime(gpointer handle, WapiFileTime *create_time,
                     WapiFileTime *last_access, WapiFileTime *last_write)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].getfiletime == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].getfiletime (handle, create_time, last_access,
                                         last_write));
}

/**
 * SetFileTime:
 * @handle: The file handle to set.  The handle must have
 * %GENERIC_WRITE access.
 * @create_time: Points to a %WapiFileTime structure that contains the
 * number of ticks since the epoch that the file was created.  May be
 * %NULL.
 * @last_access: Points to a %WapiFileTime structure that contains the
 * number of ticks since the epoch when the file was last accessed.
 * May be %NULL.
 * @last_write: Points to a %WapiFileTime structure that contains the
 * number of ticks since the epoch when the file was last written to.
 * May be %NULL.
 *
 * Sets the number of ticks since the epoch that the file referenced
 * by @handle was created, last accessed or last modified.  A tick is
 * a 100 nanosecond interval.  The epoch is Midnight, January 1 1601
 * GMT.
 *
 * Create time isn't recorded on POSIX file systems, and is ignored.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean SetFileTime(gpointer handle, const WapiFileTime *create_time,
                     const WapiFileTime *last_access,
                     const WapiFileTime *last_write)
{
        WapiHandleType type;

        type = _wapi_handle_type (handle);
        
        if (io_ops[type].setfiletime == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        return(io_ops[type].setfiletime (handle, create_time, last_access,
                                         last_write));
}

/* A tick is a 100-nanosecond interval.  File time epoch is Midnight,
 * January 1 1601 GMT
 */

#define TICKS_PER_MILLISECOND 10000L
#define TICKS_PER_SECOND 10000000L
#define TICKS_PER_MINUTE 600000000L
#define TICKS_PER_HOUR 36000000000LL
#define TICKS_PER_DAY 864000000000LL

#define isleap(y) ((y) % 4 == 0 && ((y) % 100 != 0 || (y) % 400 == 0))

static const guint16 mon_yday[2][13]={
        {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365},
        {0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366},
};

/**
 * FileTimeToSystemTime:
 * @file_time: Points to a %WapiFileTime structure that contains the
 * number of ticks to convert.
 * @system_time: Points to a %WapiSystemTime structure to receive the
 * broken-out time.
 *
 * Converts a tick count into broken-out time values.
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean FileTimeToSystemTime(const WapiFileTime *file_time,
                              WapiSystemTime *system_time)
{
        gint64 file_ticks, totaldays, rem, y;
        const guint16 *ip;
        
        if(system_time==NULL) {
                DEBUG("%s: system_time NULL", __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }
        
        file_ticks=((gint64)file_time->dwHighDateTime << 32) +
                file_time->dwLowDateTime;
        
        /* Really compares if file_ticks>=0x8000000000000000
         * (LLONG_MAX+1) but we're working with a signed value for the
         * year and day calculation to work later
         */
        if(file_ticks<0) {
                DEBUG("%s: file_time too big", __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }

        totaldays=(file_ticks / TICKS_PER_DAY);
        rem = file_ticks % TICKS_PER_DAY;
        DEBUG("%s: totaldays: %lld rem: %lld", __func__, totaldays, rem);

        system_time->wHour=rem/TICKS_PER_HOUR;
        rem %= TICKS_PER_HOUR;
        DEBUG("%s: Hour: %d rem: %lld", __func__, system_time->wHour, rem);
        
        system_time->wMinute = rem / TICKS_PER_MINUTE;
        rem %= TICKS_PER_MINUTE;
        DEBUG("%s: Minute: %d rem: %lld", __func__, system_time->wMinute,
                  rem);
        
        system_time->wSecond = rem / TICKS_PER_SECOND;
        rem %= TICKS_PER_SECOND;
        DEBUG("%s: Second: %d rem: %lld", __func__, system_time->wSecond,
                  rem);
        
        system_time->wMilliseconds = rem / TICKS_PER_MILLISECOND;
        DEBUG("%s: Milliseconds: %d", __func__,
                  system_time->wMilliseconds);

        /* January 1, 1601 was a Monday, according to Emacs calendar */
        system_time->wDayOfWeek = ((1 + totaldays) % 7) + 1;
        DEBUG("%s: Day of week: %d", __func__, system_time->wDayOfWeek);
        
        /* This algorithm to find year and month given days from epoch
         * from glibc
         */
        y=1601;
        
#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#define LEAPS_THRU_END_OF(y) (DIV(y, 4) - DIV (y, 100) + DIV (y, 400))

        while(totaldays < 0 || totaldays >= (isleap(y)?366:365)) {
                /* Guess a corrected year, assuming 365 days per year */
                gint64 yg = y + totaldays / 365 - (totaldays % 365 < 0);
                DEBUG("%s: totaldays: %lld yg: %lld y: %lld", __func__,
                          totaldays, yg,
                          y);
                g_message("%s: LEAPS(yg): %lld LEAPS(y): %lld", __func__,
                          LEAPS_THRU_END_OF(yg-1), LEAPS_THRU_END_OF(y-1));
                
                /* Adjust days and y to match the guessed year. */
                totaldays -= ((yg - y) * 365
                              + LEAPS_THRU_END_OF (yg - 1)
                              - LEAPS_THRU_END_OF (y - 1));
                DEBUG("%s: totaldays: %lld", __func__, totaldays);
                y = yg;
                DEBUG("%s: y: %lld", __func__, y);
        }
        
        system_time->wYear = y;
        DEBUG("%s: Year: %d", __func__, system_time->wYear);

        ip = mon_yday[isleap(y)];
        
        for(y=11; totaldays < ip[y]; --y) {
                continue;
        }
        totaldays-=ip[y];
        DEBUG("%s: totaldays: %lld", __func__, totaldays);
        
        system_time->wMonth = y + 1;
        DEBUG("%s: Month: %d", __func__, system_time->wMonth);

        system_time->wDay = totaldays + 1;
        DEBUG("%s: Day: %d", __func__, system_time->wDay);
        
        return(TRUE);
}

gpointer FindFirstFile (const gunichar2 *pattern, WapiFindData *find_data)
{
        struct _WapiHandle_find find_handle = {0};
        gpointer handle;
        gchar *utf8_pattern = NULL, *dir_part, *entry_part;
        int result;
        
        if (pattern == NULL) {
                DEBUG ("%s: pattern is NULL", __func__);

                SetLastError (ERROR_PATH_NOT_FOUND);
                return(INVALID_HANDLE_VALUE);
        }

        utf8_pattern = mono_unicode_to_external (pattern);
        if (utf8_pattern == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);
                
                SetLastError (ERROR_INVALID_NAME);
                return(INVALID_HANDLE_VALUE);
        }

        DEBUG ("%s: looking for [%s]", __func__, utf8_pattern);
        
        /* Figure out which bit of the pattern is the directory */
        dir_part = _wapi_dirname (utf8_pattern);
        entry_part = _wapi_basename (utf8_pattern);

#if 0
        /* Don't do this check for now, it breaks if directories
         * really do have metachars in their names (see bug 58116).
         * FIXME: Figure out a better solution to keep some checks...
         */
        if (strchr (dir_part, '*') || strchr (dir_part, '?')) {
                SetLastError (ERROR_INVALID_NAME);
                g_free (dir_part);
                g_free (entry_part);
                g_free (utf8_pattern);
                return(INVALID_HANDLE_VALUE);
        }
#endif

        /* The pattern can specify a directory or a set of files.
         *
         * The pattern can have wildcard characters ? and *, but only
         * in the section after the last directory delimiter.  (Return
         * ERROR_INVALID_NAME if there are wildcards in earlier path
         * sections.)  "*" has the usual 0-or-more chars meaning.  "?" 
         * means "match one character", "??" seems to mean "match one
         * or two characters", "???" seems to mean "match one, two or
         * three characters", etc.  Windows will also try and match
         * the mangled "short name" of files, so 8 character patterns
         * with wildcards will show some surprising results.
         *
         * All the written documentation I can find says that '?' 
         * should only match one character, and doesn't mention '??',
         * '???' etc.  I'm going to assume that the strict behaviour
         * (ie '???' means three and only three characters) is the
         * correct one, because that lets me use fnmatch(3) rather
         * than mess around with regexes.
         */

        find_handle.namelist = NULL;
        result = _wapi_io_scandir (dir_part, entry_part,
                                   &find_handle.namelist);
        
        if (result == 0) {
                /* No files, which windows seems to call
                 * FILE_NOT_FOUND
                 */
                SetLastError (ERROR_FILE_NOT_FOUND);
                g_free (utf8_pattern);
                g_free (entry_part);
                g_free (dir_part);
                return (INVALID_HANDLE_VALUE);
        }
        
        if (result < 0) {
#ifdef DEBUG_ENABLED
                gint errnum = errno;
#endif
                _wapi_set_last_path_error_from_errno (dir_part, NULL);
                DEBUG ("%s: scandir error: %s", __func__,
                           g_strerror (errnum));
                g_free (utf8_pattern);
                g_free (entry_part);
                g_free (dir_part);
                return (INVALID_HANDLE_VALUE);
        }

        g_free (utf8_pattern);
        g_free (entry_part);
        
        DEBUG ("%s: Got %d matches", __func__, result);

        find_handle.dir_part = dir_part;
        find_handle.num = result;
        find_handle.count = 0;
        
        handle = _wapi_handle_new (WAPI_HANDLE_FIND, &find_handle);
        if (handle == _WAPI_HANDLE_INVALID) {
                g_warning ("%s: error creating find handle", __func__);
                g_free (dir_part);
                g_free (entry_part);
                g_free (utf8_pattern);
                SetLastError (ERROR_GEN_FAILURE);
                
                return(INVALID_HANDLE_VALUE);
        }

        if (handle != INVALID_HANDLE_VALUE &&
            !FindNextFile (handle, find_data)) {
                FindClose (handle);
                SetLastError (ERROR_NO_MORE_FILES);
                handle = INVALID_HANDLE_VALUE;
        }

        return (handle);
}

gboolean FindNextFile (gpointer handle, WapiFindData *find_data)
{
        struct _WapiHandle_find *find_handle;
        gboolean ok;
        struct stat buf, linkbuf;
        int result;
        gchar *filename;
        gchar *utf8_filename, *utf8_basename;
        gunichar2 *utf16_basename;
        time_t create_time;
        glong bytes;
        int thr_ret;
        gboolean ret = FALSE;
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FIND,
                                (gpointer *)&find_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up find handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }

        thr_ret = _wapi_handle_lock_handle (handle);
        g_assert (thr_ret == 0);
        
retry:
        if (find_handle->count >= find_handle->num) {
                SetLastError (ERROR_NO_MORE_FILES);
                goto cleanup;
        }

        /* stat next match */

        filename = g_build_filename (find_handle->dir_part, find_handle->namelist[find_handle->count ++], NULL);

        result = _wapi_stat (filename, &buf);
        if (result == -1 && errno == ENOENT) {
                /* Might be a dangling symlink */
                result = _wapi_lstat (filename, &buf);
        }
        
        if (result != 0) {
                DEBUG ("%s: stat failed: %s", __func__, filename);

                g_free (filename);
                goto retry;
        }

#ifndef __native_client__
        result = _wapi_lstat (filename, &linkbuf);
        if (result != 0) {
                DEBUG ("%s: lstat failed: %s", __func__, filename);

                g_free (filename);
                goto retry;
        }
#endif

        utf8_filename = mono_utf8_from_external (filename);
        if (utf8_filename == NULL) {
                /* We couldn't turn this filename into utf8 (eg the
                 * encoding of the name wasn't convertible), so just
                 * ignore it.
                 */
                g_warning ("%s: Bad encoding for '%s'\nConsider using MONO_EXTERNAL_ENCODINGS\n", __func__, filename);
                
                g_free (filename);
                goto retry;
        }
        g_free (filename);
        
        DEBUG ("%s: Found [%s]", __func__, utf8_filename);
        
        /* fill data block */

        if (buf.st_mtime < buf.st_ctime)
                create_time = buf.st_mtime;
        else
                create_time = buf.st_ctime;
        
#ifdef __native_client__
        find_data->dwFileAttributes = _wapi_stat_to_file_attributes (utf8_filename, &buf, NULL);
#else
        find_data->dwFileAttributes = _wapi_stat_to_file_attributes (utf8_filename, &buf, &linkbuf);
#endif

        _wapi_time_t_to_filetime (create_time, &find_data->ftCreationTime);
        _wapi_time_t_to_filetime (buf.st_atime, &find_data->ftLastAccessTime);
        _wapi_time_t_to_filetime (buf.st_mtime, &find_data->ftLastWriteTime);

        if (find_data->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
                find_data->nFileSizeHigh = 0;
                find_data->nFileSizeLow = 0;
        } else {
                find_data->nFileSizeHigh = buf.st_size >> 32;
                find_data->nFileSizeLow = buf.st_size & 0xFFFFFFFF;
        }

        find_data->dwReserved0 = 0;
        find_data->dwReserved1 = 0;

        utf8_basename = _wapi_basename (utf8_filename);
        utf16_basename = g_utf8_to_utf16 (utf8_basename, -1, NULL, &bytes,
                                          NULL);
        if(utf16_basename==NULL) {
                g_free (utf8_basename);
                g_free (utf8_filename);
                goto retry;
        }
        ret = TRUE;
        
        /* utf16 is 2 * utf8 */
        bytes *= 2;

        memset (find_data->cFileName, '\0', (MAX_PATH*2));

        /* Truncating a utf16 string like this might leave the last
         * char incomplete
         */
        memcpy (find_data->cFileName, utf16_basename,
                bytes<(MAX_PATH*2)-2?bytes:(MAX_PATH*2)-2);

        find_data->cAlternateFileName [0] = 0;  /* not used */

        g_free (utf8_basename);
        g_free (utf8_filename);
        g_free (utf16_basename);

cleanup:
        thr_ret = _wapi_handle_unlock_handle (handle);
        g_assert (thr_ret == 0);
        
        return(ret);
}

/**
 * FindClose:
 * @wapi_handle: the find handle to close.
 *
 * Closes find handle @wapi_handle
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean FindClose (gpointer handle)
{
        struct _WapiHandle_find *find_handle;
        gboolean ok;
        int thr_ret;

        if (handle == NULL) {
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }
        
        ok=_wapi_lookup_handle (handle, WAPI_HANDLE_FIND,
                                (gpointer *)&find_handle);
        if(ok==FALSE) {
                g_warning ("%s: error looking up find handle %p", __func__,
                           handle);
                SetLastError (ERROR_INVALID_HANDLE);
                return(FALSE);
        }

        thr_ret = _wapi_handle_lock_handle (handle);
        g_assert (thr_ret == 0);
        
        g_strfreev (find_handle->namelist);
        g_free (find_handle->dir_part);

        thr_ret = _wapi_handle_unlock_handle (handle);
        g_assert (thr_ret == 0);
        
        _wapi_handle_unref (handle);
        
        return(TRUE);
}

/**
 * CreateDirectory:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the directory to be created.
 * @security: ignored for now
 *
 * Creates directory @name
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean CreateDirectory (const gunichar2 *name,
                          WapiSecurityAttributes *security)
{
        gchar *utf8_name;
        int result;
        
        if (name == NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }
        
        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);
        
                SetLastError (ERROR_INVALID_NAME);
                return FALSE;
        }

        result = _wapi_mkdir (utf8_name, 0777);

        if (result == 0) {
                g_free (utf8_name);
                return TRUE;
        }

        _wapi_set_last_path_error_from_errno (NULL, utf8_name);
        g_free (utf8_name);
        return FALSE;
}

/**
 * RemoveDirectory:
 * @name: a pointer to a NULL-terminated unicode string, that names
 * the directory to be removed.
 *
 * Removes directory @name
 *
 * Return value: %TRUE on success, %FALSE otherwise.
 */
gboolean RemoveDirectory (const gunichar2 *name)
{
        gchar *utf8_name;
        int result;
        
        if (name == NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);
                
                SetLastError (ERROR_INVALID_NAME);
                return FALSE;
        }

        result = _wapi_rmdir (utf8_name);
        if (result == -1) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                
                return(FALSE);
        }
        g_free (utf8_name);

        return(TRUE);
}

/**
 * GetFileAttributes:
 * @name: a pointer to a NULL-terminated unicode filename.
 *
 * Gets the attributes for @name;
 *
 * Return value: %INVALID_FILE_ATTRIBUTES on failure
 */
guint32 GetFileAttributes (const gunichar2 *name)
{
        gchar *utf8_name;
        struct stat buf, linkbuf;
        int result;
        guint32 ret;
        
        if (name == NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }
        
        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return (INVALID_FILE_ATTRIBUTES);
        }

        result = _wapi_stat (utf8_name, &buf);
        if (result == -1 && errno == ENOENT) {
                /* Might be a dangling symlink... */
                result = _wapi_lstat (utf8_name, &buf);
        }

        if (result != 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                return (INVALID_FILE_ATTRIBUTES);
        }

#ifndef __native_client__
        result = _wapi_lstat (utf8_name, &linkbuf);
        if (result != 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                return (INVALID_FILE_ATTRIBUTES);
        }
#endif
        
#ifdef __native_client__
        ret = _wapi_stat_to_file_attributes (utf8_name, &buf, NULL);
#else
        ret = _wapi_stat_to_file_attributes (utf8_name, &buf, &linkbuf);
#endif
        
        g_free (utf8_name);

        return(ret);
}

/**
 * GetFileAttributesEx:
 * @name: a pointer to a NULL-terminated unicode filename.
 * @level: must be GetFileExInfoStandard
 * @info: pointer to a WapiFileAttributesData structure
 *
 * Gets attributes, size and filetimes for @name;
 *
 * Return value: %TRUE on success, %FALSE on failure
 */
gboolean GetFileAttributesEx (const gunichar2 *name, WapiGetFileExInfoLevels level, gpointer info)
{
        gchar *utf8_name;
        WapiFileAttributesData *data;

        struct stat buf, linkbuf;
        time_t create_time;
        int result;
        
        if (level != GetFileExInfoStandard) {
                DEBUG ("%s: info level %d not supported.", __func__,
                           level);

                SetLastError (ERROR_INVALID_PARAMETER);
                return FALSE;
        }
        
        if (name == NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);

                SetLastError (ERROR_INVALID_PARAMETER);
                return FALSE;
        }

        result = _wapi_stat (utf8_name, &buf);
        if (result == -1 && errno == ENOENT) {
                /* Might be a dangling symlink... */
                result = _wapi_lstat (utf8_name, &buf);
        }
        
        if (result != 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                return FALSE;
        }

        result = _wapi_lstat (utf8_name, &linkbuf);
        if (result != 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                return(FALSE);
        }

        /* fill data block */

        data = (WapiFileAttributesData *)info;

        if (buf.st_mtime < buf.st_ctime)
                create_time = buf.st_mtime;
        else
                create_time = buf.st_ctime;
        
        data->dwFileAttributes = _wapi_stat_to_file_attributes (utf8_name,
                                                                &buf,
                                                                &linkbuf);

        g_free (utf8_name);

        _wapi_time_t_to_filetime (create_time, &data->ftCreationTime);
        _wapi_time_t_to_filetime (buf.st_atime, &data->ftLastAccessTime);
        _wapi_time_t_to_filetime (buf.st_mtime, &data->ftLastWriteTime);

        if (data->dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
                data->nFileSizeHigh = 0;
                data->nFileSizeLow = 0;
        }
        else {
                data->nFileSizeHigh = buf.st_size >> 32;
                data->nFileSizeLow = buf.st_size & 0xFFFFFFFF;
        }

        return TRUE;
}

/**
 * SetFileAttributes
 * @name: name of file
 * @attrs: attributes to set
 *
 * Changes the attributes on a named file.
 *
 * Return value: %TRUE on success, %FALSE on failure.
 */
extern gboolean SetFileAttributes (const gunichar2 *name, guint32 attrs)
{
        /* FIXME: think of something clever to do on unix */
        gchar *utf8_name;
        struct stat buf;
        int result;

        /*
         * Currently we only handle one *internal* case, with a value that is
         * not standard: 0x80000000, which means `set executable bit'
         */
        
        if (name == NULL) {
                DEBUG("%s: name is NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return(FALSE);
        }

        utf8_name = mono_unicode_to_external (name);
        if (utf8_name == NULL) {
                DEBUG ("%s: unicode conversion returned NULL", __func__);

                SetLastError (ERROR_INVALID_NAME);
                return FALSE;
        }

        result = _wapi_stat (utf8_name, &buf);
        if (result == -1 && errno == ENOENT) {
                /* Might be a dangling symlink... */
                result = _wapi_lstat (utf8_name, &buf);
        }

        if (result != 0) {
                _wapi_set_last_path_error_from_errno (NULL, utf8_name);
                g_free (utf8_name);
                return FALSE;
        }

        /* Contrary to the documentation, ms allows NORMAL to be
         * specified along with other attributes, so dont bother to
         * catch that case here.
         */
        if (attrs & FILE_ATTRIBUTE_READONLY) {
                result = _wapi_chmod (utf8_name, buf.st_mode & ~(S_IWUSR | S_IWOTH | S_IWGRP));
        } else {
                result = _wapi_chmod (utf8_name, buf.st_mode | S_IWUSR);
        }

        /* Ignore the other attributes for now */

        if (attrs & 0x80000000){
                mode_t exec_mask = 0;

                if ((buf.st_mode & S_IRUSR) != 0)
                        exec_mask |= S_IXUSR;

                if ((buf.st_mode & S_IRGRP) != 0)
                        exec_mask |= S_IXGRP;

                if ((buf.st_mode & S_IROTH) != 0)
                        exec_mask |= S_IXOTH;

                result = chmod (utf8_name, buf.st_mode | exec_mask);
        }
        /* Don't bother to reset executable (might need to change this
         * policy)
         */
        
        g_free (utf8_name);

        return(TRUE);
}

/**
 * GetCurrentDirectory
 * @length: size of the buffer
 * @buffer: pointer to buffer that recieves path
 *
 * Retrieves the current directory for the current process.
 *
 * Return value: number of characters in buffer on success, zero on failure
 */
extern guint32 GetCurrentDirectory (guint32 length, gunichar2 *buffer)
{
        gunichar2 *utf16_path;
        glong count;
        gsize bytes;

#ifdef __native_client__
        gchar *path = g_get_current_dir ();
        if (length < strlen(path) + 1 || path == NULL)
                return 0;
        memcpy (buffer, path, strlen(path) + 1);
#else
        if (getcwd ((char*)buffer, length) == NULL) {
                if (errno == ERANGE) { /*buffer length is not big enough */ 
                        gchar *path = g_get_current_dir (); /*FIXME g_get_current_dir doesn't work with broken paths and calling it just to know the path length is silly*/
                        if (path == NULL)
                                return 0;
                        utf16_path = mono_unicode_from_external (path, &bytes);
                        g_free (utf16_path);
                        g_free (path);
                        return (bytes/2)+1;
                }
                _wapi_set_last_error_from_errno ();
                return 0;
        }
#endif

        utf16_path = mono_unicode_from_external ((gchar*)buffer, &bytes);
        count = (bytes/2)+1;
        g_assert (count <= length); /*getcwd must have failed before with ERANGE*/

        /* Add the terminator */
        memset (buffer, '\0', bytes+2);
        memcpy (buffer, utf16_path, bytes);
        
        g_free (utf16_path);

        return count;
}

/**
 * SetCurrentDirectory
 * @path: path to new directory
 *
 * Changes the directory path for the current process.
 *
 * Return value: %TRUE on success, %FALSE on failure.
 */
extern gboolean SetCurrentDirectory (const gunichar2 *path)
{
        gchar *utf8_path;
        gboolean result;

        if (path == NULL) {
                SetLastError (ERROR_INVALID_PARAMETER);
                return(FALSE);
        }
        
        utf8_path = mono_unicode_to_external (path);
        if (_wapi_chdir (utf8_path) != 0) {
                _wapi_set_last_error_from_errno ();
                result = FALSE;
        }
        else
                result = TRUE;

        g_free (utf8_path);
        return result;
}

gboolean CreatePipe (gpointer *readpipe, gpointer *writepipe,
                     WapiSecurityAttributes *security G_GNUC_UNUSED, guint32 size)
{
        struct _WapiHandle_file pipe_read_handle = {0};
        struct _WapiHandle_file pipe_write_handle = {0};
        gpointer read_handle;
        gpointer write_handle;
        int filedes[2];
        int ret;
        
        mono_once (&io_ops_once, io_ops_init);
        
        DEBUG ("%s: Creating pipe", __func__);

        ret=pipe (filedes);
        if(ret==-1) {
                DEBUG ("%s: Error creating pipe: %s", __func__,
                           strerror (errno));
                
                _wapi_set_last_error_from_errno ();
                return(FALSE);
        }

        if (filedes[0] >= _wapi_fd_reserve ||
            filedes[1] >= _wapi_fd_reserve) {
                DEBUG ("%s: File descriptor is too big", __func__);

                SetLastError (ERROR_TOO_MANY_OPEN_FILES);
                
                close (filedes[0]);
                close (filedes[1]);
                
                return(FALSE);
        }
        
        /* filedes[0] is open for reading, filedes[1] for writing */

        pipe_read_handle.fd = filedes [0];
        pipe_read_handle.fileaccess = GENERIC_READ;
        read_handle = _wapi_handle_new_fd (WAPI_HANDLE_PIPE, filedes[0],
                                           &pipe_read_handle);
        if (read_handle == _WAPI_HANDLE_INVALID) {
                g_warning ("%s: error creating pipe read handle", __func__);
                close (filedes[0]);
                close (filedes[1]);
                SetLastError (ERROR_GEN_FAILURE);
                
                return(FALSE);
        }
        
        pipe_write_handle.fd = filedes [1];
        pipe_write_handle.fileaccess = GENERIC_WRITE;
        write_handle = _wapi_handle_new_fd (WAPI_HANDLE_PIPE, filedes[1],
                                            &pipe_write_handle);
        if (write_handle == _WAPI_HANDLE_INVALID) {
                g_warning ("%s: error creating pipe write handle", __func__);
                _wapi_handle_unref (read_handle);
                
                close (filedes[0]);
                close (filedes[1]);
                SetLastError (ERROR_GEN_FAILURE);
                
                return(FALSE);
        }
        
        *readpipe = read_handle;
        *writepipe = write_handle;

        DEBUG ("%s: Returning pipe: read handle %p, write handle %p",
                   __func__, read_handle, write_handle);

        return(TRUE);
}

guint32 GetTempPath (guint32 len, gunichar2 *buf)
{
        gchar *tmpdir=g_strdup (g_get_tmp_dir ());
        gunichar2 *tmpdir16=NULL;
        glong dirlen;
        gsize bytes;
        guint32 ret;
        
        if(tmpdir[strlen (tmpdir)]!='/') {
                g_free (tmpdir);
                tmpdir=g_strdup_printf ("%s/", g_get_tmp_dir ());
        }
        
        tmpdir16=mono_unicode_from_external (tmpdir, &bytes);
        if(tmpdir16==NULL) {
                g_free (tmpdir);
                return(0);
        } else {
                dirlen=(bytes/2);
                
                if(dirlen+1>len) {
                        DEBUG ("%s: Size %d smaller than needed (%ld)",
                                   __func__, len, dirlen+1);
                
                        ret=dirlen+1;
                } else {
                        /* Add the terminator */
                        memset (buf, '\0', bytes+2);
                        memcpy (buf, tmpdir16, bytes);
                
                        ret=dirlen;
                }
        }

        if(tmpdir16!=NULL) {
                g_free (tmpdir16);
        }
        g_free (tmpdir);
        
        return(ret);
}

#ifdef HAVE_GETFSSTAT
/* Darwin has getfsstat */
gint32 GetLogicalDriveStrings (guint32 len, gunichar2 *buf)
{
        struct statfs *stats;
        int size, n, i;
        gunichar2 *dir;
        glong length, total = 0;
        
        n = getfsstat (NULL, 0, MNT_NOWAIT);
        if (n == -1)
                return 0;
        size = n * sizeof (struct statfs);
        stats = (struct statfs *) g_malloc (size);
        if (stats == NULL)
                return 0;
        if (getfsstat (stats, size, MNT_NOWAIT) == -1){
                g_free (stats);
                return 0;
        }
        for (i = 0; i < n; i++){
                dir = g_utf8_to_utf16 (stats [i].f_mntonname, -1, NULL, &length, NULL);
                if (total + length < len){
                        memcpy (buf + total, dir, sizeof (gunichar2) * length);
                        buf [total+length] = 0;
                } 
                g_free (dir);
                total += length + 1;
        }
        if (total < len)
                buf [total] = 0;
        total++;
        g_free (stats);
        return total;
}
#else
/* In-place octal sequence replacement */
static void
unescape_octal (gchar *str)
{
        gchar *rptr;
        gchar *wptr;

        if (str == NULL)
                return;

        rptr = wptr = str;
        while (*rptr != '\0') {
                if (*rptr == '\\') {
                        char c;
                        rptr++;
                        c = (*(rptr++) - '0') << 6;
                        c += (*(rptr++) - '0') << 3;
                        c += *(rptr++) - '0';
                        *wptr++ = c;
                } else if (wptr != rptr) {
                        *wptr++ = *rptr++;
                } else {
                        rptr++; wptr++;
                }
        }
        *wptr = '\0';
}
static gint32 GetLogicalDriveStrings_Mtab (guint32 len, gunichar2 *buf);

#if __linux__
#define GET_LOGICAL_DRIVE_STRINGS_BUFFER 512
#define GET_LOGICAL_DRIVE_STRINGS_MOUNTPOINT_BUFFER 512
#define GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER 64

typedef struct 
{
        glong total;
        guint32 buffer_index;
        guint32 mountpoint_index;
        guint32 field_number;
        guint32 allocated_size;
        guint32 fsname_index;
        guint32 fstype_index;
        gchar mountpoint [GET_LOGICAL_DRIVE_STRINGS_MOUNTPOINT_BUFFER + 1];
        gchar *mountpoint_allocated;
        gchar buffer [GET_LOGICAL_DRIVE_STRINGS_BUFFER];
        gchar fsname [GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER + 1];
        gchar fstype [GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER + 1];
        ssize_t nbytes;
        gchar delimiter;
        gboolean check_mount_source;
} LinuxMountInfoParseState;

static gboolean GetLogicalDriveStrings_Mounts (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state);
static gboolean GetLogicalDriveStrings_MountInfo (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state);
static void append_to_mountpoint (LinuxMountInfoParseState *state);
static gboolean add_drive_string (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state);

gint32 GetLogicalDriveStrings (guint32 len, gunichar2 *buf)
{
        int fd;
        gint32 ret = 0;
        LinuxMountInfoParseState state;
        gboolean (*parser)(guint32, gunichar2*, LinuxMountInfoParseState*) = NULL;

        memset (buf, 0, len * sizeof (gunichar2));
        fd = open ("/proc/self/mountinfo", O_RDONLY);
        if (fd != -1)
                parser = GetLogicalDriveStrings_MountInfo;
        else {
                fd = open ("/proc/mounts", O_RDONLY);
                if (fd != -1)
                        parser = GetLogicalDriveStrings_Mounts;
        }

        if (!parser) {
                ret = GetLogicalDriveStrings_Mtab (len, buf);
                goto done_and_out;
        }

        memset (&state, 0, sizeof (LinuxMountInfoParseState));
        state.field_number = 1;
        state.delimiter = ' ';

        while ((state.nbytes = read (fd, state.buffer, GET_LOGICAL_DRIVE_STRINGS_BUFFER)) > 0) {
                state.buffer_index = 0;

                while ((*parser)(len, buf, &state)) {
                        if (state.buffer [state.buffer_index] == '\n') {
                                gboolean quit = add_drive_string (len, buf, &state);
                                state.field_number = 1;
                                state.buffer_index++;
                                if (state.mountpoint_allocated) {
                                        g_free (state.mountpoint_allocated);
                                        state.mountpoint_allocated = NULL;
                                }
                                if (quit) {
                                        ret = state.total;
                                        goto done_and_out;
                                }
                        }
                }
        };
        ret = state.total;

  done_and_out:
        if (fd != -1)
                close (fd);
        return ret;
}

static gboolean GetLogicalDriveStrings_Mounts (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state)
{
        gchar *ptr;

        if (state->field_number == 1)
                state->check_mount_source = TRUE;

        while (state->buffer_index < (guint32)state->nbytes) {
                if (state->buffer [state->buffer_index] == state->delimiter) {
                        state->field_number++;
                        switch (state->field_number) {
                                case 2:
                                        state->mountpoint_index = 0;
                                        break;

                                case 3:
                                        if (state->mountpoint_allocated)
                                                state->mountpoint_allocated [state->mountpoint_index] = 0;
                                        else
                                                state->mountpoint [state->mountpoint_index] = 0;
                                        break;

                                default:
                                        ptr = (gchar*)memchr (state->buffer + state->buffer_index, '\n', GET_LOGICAL_DRIVE_STRINGS_BUFFER - state->buffer_index);
                                        if (ptr)
                                                state->buffer_index = (ptr - (gchar*)state->buffer) - 1;
                                        else
                                                state->buffer_index = state->nbytes;
                                        return TRUE;
                        }
                        state->buffer_index++;
                        continue;
                } else if (state->buffer [state->buffer_index] == '\n')
                        return TRUE;

                switch (state->field_number) {
                        case 1:
                                if (state->check_mount_source) {
                                        if (state->fsname_index == 0 && state->buffer [state->buffer_index] == '/') {
                                                /* We can ignore the rest, it's a device
                                                 * path */
                                                state->check_mount_source = FALSE;
                                                state->fsname [state->fsname_index++] = '/';
                                                break;
                                        }
                                        if (state->fsname_index < GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER)
                                                state->fsname [state->fsname_index++] = state->buffer [state->buffer_index];
                                }
                                break;

                        case 2:
                                append_to_mountpoint (state);
                                break;

                        case 3:
                                if (state->fstype_index < GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER)
                                        state->fstype [state->fstype_index++] = state->buffer [state->buffer_index];
                                break;
                }

                state->buffer_index++;
        }

        return FALSE;
}

static gboolean GetLogicalDriveStrings_MountInfo (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state)
{
        while (state->buffer_index < (guint32)state->nbytes) {
                if (state->buffer [state->buffer_index] == state->delimiter) {
                        state->field_number++;
                        switch (state->field_number) {
                                case 5:
                                        state->mountpoint_index = 0;
                                        break;

                                case 6:
                                        if (state->mountpoint_allocated)
                                                state->mountpoint_allocated [state->mountpoint_index] = 0;
                                        else
                                                state->mountpoint [state->mountpoint_index] = 0;
                                        break;

                                case 7:
                                        state->delimiter = '-';
                                        break;

                                case 8:
                                        state->delimiter = ' ';
                                        break;

                                case 10:
                                        state->check_mount_source = TRUE;
                                        break;
                        }
                        state->buffer_index++;
                        continue;
                } else if (state->buffer [state->buffer_index] == '\n')
                        return TRUE;

                switch (state->field_number) {
                        case 5:
                                append_to_mountpoint (state);
                                break;

                        case 9:
                                if (state->fstype_index < GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER)
                                        state->fstype [state->fstype_index++] = state->buffer [state->buffer_index];
                                break;

                        case 10:
                                if (state->check_mount_source) {
                                        if (state->fsname_index == 0 && state->buffer [state->buffer_index] == '/') {
                                                /* We can ignore the rest, it's a device
                                                 * path */
                                                state->check_mount_source = FALSE;
                                                state->fsname [state->fsname_index++] = '/';
                                                break;
                                        }
                                        if (state->fsname_index < GET_LOGICAL_DRIVE_STRINGS_FSNAME_BUFFER)
                                                state->fsname [state->fsname_index++] = state->buffer [state->buffer_index];
                                }
                                break;
                }

                state->buffer_index++;
        }

        return FALSE;
}

static void
append_to_mountpoint (LinuxMountInfoParseState *state)
{
        gchar ch = state->buffer [state->buffer_index];
        if (state->mountpoint_allocated) {
                if (state->mountpoint_index >= state->allocated_size) {
                        guint32 newsize = (state->allocated_size << 1) + 1;
                        gchar *newbuf = g_malloc0 (newsize * sizeof (gchar));

                        memcpy (newbuf, state->mountpoint_allocated, state->mountpoint_index);
                        g_free (state->mountpoint_allocated);
                        state->mountpoint_allocated = newbuf;
                        state->allocated_size = newsize;
                }
                state->mountpoint_allocated [state->mountpoint_index++] = ch;
        } else {
                if (state->mountpoint_index >= GET_LOGICAL_DRIVE_STRINGS_MOUNTPOINT_BUFFER) {
                        state->allocated_size = (state->mountpoint_index << 1) + 1;
                        state->mountpoint_allocated = g_malloc0 (state->allocated_size * sizeof (gchar));
                        memcpy (state->mountpoint_allocated, state->mountpoint, state->mountpoint_index);
                        state->mountpoint_allocated [state->mountpoint_index++] = ch;
                } else
                        state->mountpoint [state->mountpoint_index++] = ch;
        }
}

static gboolean
add_drive_string (guint32 len, gunichar2 *buf, LinuxMountInfoParseState *state)
{
        gboolean quit = FALSE;
        gboolean ignore_entry;

        if (state->fsname_index == 1 && state->fsname [0] == '/')
                ignore_entry = FALSE;
        else if (state->fsname_index == 0 || memcmp ("none", state->fsname, state->fsname_index) == 0)
                ignore_entry = TRUE;
        else if (state->fstype_index >= 5 && memcmp ("fuse.", state->fstype, 5) == 0) {
                /* Ignore GNOME's gvfs */
                if (state->fstype_index == 21 && memcmp ("fuse.gvfs-fuse-daemon", state->fstype, state->fstype_index) == 0)
                        ignore_entry = TRUE;
                else
                        ignore_entry = FALSE;
        } else if (state->fstype_index == 3 && memcmp ("nfs", state->fstype, state->fstype_index) == 0)
                ignore_entry = FALSE;
        else
                ignore_entry = TRUE;

        if (!ignore_entry) {
                gunichar2 *dir;
                glong length;
                gchar *mountpoint = state->mountpoint_allocated ? state->mountpoint_allocated : state->mountpoint;

                unescape_octal (mountpoint);
                dir = g_utf8_to_utf16 (mountpoint, -1, NULL, &length, NULL);
                if (state->total + length + 1 > len) {
                        quit = TRUE;
                        state->total = len * 2;
                } else {
                        length++;
                        memcpy (buf + state->total, dir, sizeof (gunichar2) * length);
                        state->total += length;
                }
                g_free (dir);
        }
        state->fsname_index = 0;
        state->fstype_index = 0;

        return quit;
}
#else
gint32
GetLogicalDriveStrings (guint32 len, gunichar2 *buf)
{
        return GetLogicalDriveStrings_Mtab (len, buf);
}
#endif
static gint32
GetLogicalDriveStrings_Mtab (guint32 len, gunichar2 *buf)
{
        FILE *fp;
        gunichar2 *ptr, *dir;
        glong length, total = 0;
        gchar buffer [512];
        gchar **splitted;

        memset (buf, 0, sizeof (gunichar2) * (len + 1)); 
        buf [0] = '/';
        buf [1] = 0;
        buf [2] = 0;

        /* Sigh, mntent and friends don't work well.
         * It stops on the first line that doesn't begin with a '/'.
         * (linux 2.6.5, libc 2.3.2.ds1-12) - Gonz */
        fp = fopen ("/etc/mtab", "rt");
        if (fp == NULL) {
                fp = fopen ("/etc/mnttab", "rt");
                if (fp == NULL)
                        return 1;
        }

        ptr = buf;
        while (fgets (buffer, 512, fp) != NULL) {
                if (*buffer != '/')
                        continue;

                splitted = g_strsplit (buffer, " ", 0);
                if (!*splitted || !*(splitted + 1)) {
                        g_strfreev (splitted);
                        continue;
                }

                unescape_octal (*(splitted + 1));
                dir = g_utf8_to_utf16 (*(splitted + 1), -1, NULL, &length, NULL);
                g_strfreev (splitted);
                if (total + length + 1 > len) {
                        fclose (fp);
                        g_free (dir);
                        return len * 2; /* guess */
                }

                memcpy (ptr + total, dir, sizeof (gunichar2) * length);
                g_free (dir);
                total += length + 1;
        }

        fclose (fp);
        return total;
/* Commented out, does not work with my mtab!!! - Gonz */
#ifdef NOTENABLED /* HAVE_MNTENT_H */
{
        FILE *fp;
        struct mntent *mnt;
        gunichar2 *ptr, *dir;
        glong len, total = 0;
        

        fp = setmntent ("/etc/mtab", "rt");
        if (fp == NULL) {
                fp = setmntent ("/etc/mnttab", "rt");
                if (fp == NULL)
                        return;
        }

        ptr = buf;
        while ((mnt = getmntent (fp)) != NULL) {
                g_print ("GOT %s\n", mnt->mnt_dir);
                dir = g_utf8_to_utf16 (mnt->mnt_dir, &len, NULL, NULL, NULL);
                if (total + len + 1 > len) {
                        return len * 2; /* guess */
                }

                memcpy (ptr + total, dir, sizeof (gunichar2) * len);
                g_free (dir);
                total += len + 1;
        }

        endmntent (fp);
        return total;
}
#endif
}
#endif

#if defined(HAVE_STATVFS) || defined(HAVE_STATFS)
gboolean GetDiskFreeSpaceEx(const gunichar2 *path_name, WapiULargeInteger *free_bytes_avail,
                            WapiULargeInteger *total_number_of_bytes,
                            WapiULargeInteger *total_number_of_free_bytes)
{
#ifdef HAVE_STATVFS
        struct statvfs fsstat;
#elif defined(HAVE_STATFS)
        struct statfs fsstat;
#endif
        gboolean isreadonly;
        gchar *utf8_path_name;
        int ret;
        unsigned long block_size;

        if (path_name == NULL) {
                utf8_path_name = g_strdup (g_get_current_dir());
                if (utf8_path_name == NULL) {
                        SetLastError (ERROR_DIRECTORY);
                        return(FALSE);
                }
        }
        else {
                utf8_path_name = mono_unicode_to_external (path_name);
                if (utf8_path_name == NULL) {
                        DEBUG("%s: unicode conversion returned NULL", __func__);

                        SetLastError (ERROR_INVALID_NAME);
                        return(FALSE);
                }
        }

        do {
#ifdef HAVE_STATVFS
                ret = statvfs (utf8_path_name, &fsstat);
                isreadonly = ((fsstat.f_flag & ST_RDONLY) == ST_RDONLY);
                block_size = fsstat.f_frsize;
#elif defined(HAVE_STATFS)
                ret = statfs (utf8_path_name, &fsstat);
#if defined (MNT_RDONLY)
                isreadonly = ((fsstat.f_flags & MNT_RDONLY) == MNT_RDONLY);
#elif defined (MS_RDONLY)
                isreadonly = ((fsstat.f_flags & MS_RDONLY) == MS_RDONLY);
#endif
                block_size = fsstat.f_bsize;
#endif
        } while(ret == -1 && errno == EINTR);

        g_free(utf8_path_name);

        if (ret == -1) {
                _wapi_set_last_error_from_errno ();
                DEBUG ("%s: statvfs failed: %s", __func__, strerror (errno));
                return(FALSE);
        }

        /* total number of free bytes for non-root */
        if (free_bytes_avail != NULL) {
                if (isreadonly) {
                        free_bytes_avail->QuadPart = 0;
                }
                else {
                        free_bytes_avail->QuadPart = block_size * (guint64)fsstat.f_bavail;
                }
        }

        /* total number of bytes available for non-root */
        if (total_number_of_bytes != NULL) {
                total_number_of_bytes->QuadPart = block_size * (guint64)fsstat.f_blocks;
        }

        /* total number of bytes available for root */
        if (total_number_of_free_bytes != NULL) {
                if (isreadonly) {
                        total_number_of_free_bytes->QuadPart = 0;
                }
                else {
                        total_number_of_free_bytes->QuadPart = block_size * (guint64)fsstat.f_bfree;
                }
        }
        
        return(TRUE);
}
#else
gboolean GetDiskFreeSpaceEx(const gunichar2 *path_name, WapiULargeInteger *free_bytes_avail,
                            WapiULargeInteger *total_number_of_bytes,
                            WapiULargeInteger *total_number_of_free_bytes)
{
        if (free_bytes_avail != NULL) {
                free_bytes_avail->QuadPart = (guint64) -1;
        }

        if (total_number_of_bytes != NULL) {
                total_number_of_bytes->QuadPart = (guint64) -1;
        }

        if (total_number_of_free_bytes != NULL) {
                total_number_of_free_bytes->QuadPart = (guint64) -1;
        }

        return(TRUE);
}
#endif

/*
 * General Unix support
 */
typedef struct {
        guint32 drive_type;
#if __linux__
        const long fstypeid;
#endif
        const gchar* fstype;
} _wapi_drive_type;

static _wapi_drive_type _wapi_drive_types[] = {
#if PLATFORM_MACOSX
        { DRIVE_REMOTE, "afp" },
        { DRIVE_REMOTE, "autofs" },
        { DRIVE_CDROM, "cddafs" },
        { DRIVE_CDROM, "cd9660" },
        { DRIVE_RAMDISK, "devfs" },
        { DRIVE_FIXED, "exfat" },
        { DRIVE_RAMDISK, "fdesc" },
        { DRIVE_REMOTE, "ftp" },
        { DRIVE_FIXED, "hfs" },
        { DRIVE_FIXED, "msdos" },
        { DRIVE_REMOTE, "nfs" },
        { DRIVE_FIXED, "ntfs" },
        { DRIVE_REMOTE, "smbfs" },
        { DRIVE_FIXED, "udf" },
        { DRIVE_REMOTE, "webdav" },
        { DRIVE_UNKNOWN, NULL }
#elif __linux__
        { DRIVE_FIXED, ADFS_SUPER_MAGIC, "adfs"},
        { DRIVE_FIXED, AFFS_SUPER_MAGIC, "affs"},
        { DRIVE_REMOTE, AFS_SUPER_MAGIC, "afs"},
        { DRIVE_RAMDISK, AUTOFS_SUPER_MAGIC, "autofs"},
        { DRIVE_RAMDISK, AUTOFS_SBI_MAGIC, "autofs4"},
        { DRIVE_REMOTE, CODA_SUPER_MAGIC, "coda" },
        { DRIVE_RAMDISK, CRAMFS_MAGIC, "cramfs"},
        { DRIVE_RAMDISK, CRAMFS_MAGIC_WEND, "cramfs"},
        { DRIVE_REMOTE, CIFS_MAGIC_NUMBER, "cifs"},
        { DRIVE_RAMDISK, DEBUGFS_MAGIC, "debugfs"},
        { DRIVE_RAMDISK, SYSFS_MAGIC, "sysfs"},
        { DRIVE_RAMDISK, SECURITYFS_MAGIC, "securityfs"},
        { DRIVE_RAMDISK, SELINUX_MAGIC, "selinuxfs"},
        { DRIVE_RAMDISK, RAMFS_MAGIC, "ramfs"},
        { DRIVE_FIXED, SQUASHFS_MAGIC, "squashfs"},
        { DRIVE_FIXED, EFS_SUPER_MAGIC, "efs"},
        { DRIVE_FIXED, EXT2_SUPER_MAGIC, "ext"},
        { DRIVE_FIXED, EXT3_SUPER_MAGIC, "ext"},
        { DRIVE_FIXED, EXT4_SUPER_MAGIC, "ext"},
        { DRIVE_REMOTE, XENFS_SUPER_MAGIC, "xenfs"},
        { DRIVE_FIXED, BTRFS_SUPER_MAGIC, "btrfs"},
        { DRIVE_FIXED, HFS_SUPER_MAGIC, "hfs"},
        { DRIVE_FIXED, HFSPLUS_SUPER_MAGIC, "hfsplus"},
        { DRIVE_FIXED, HPFS_SUPER_MAGIC, "hpfs"},
        { DRIVE_RAMDISK, HUGETLBFS_MAGIC, "hugetlbfs"},
        { DRIVE_CDROM, ISOFS_SUPER_MAGIC, "iso"},
        { DRIVE_FIXED, JFFS2_SUPER_MAGIC, "jffs2"},
        { DRIVE_RAMDISK, ANON_INODE_FS_MAGIC, "anon_inode"},
        { DRIVE_FIXED, JFS_SUPER_MAGIC, "jfs"},
        { DRIVE_FIXED, MINIX_SUPER_MAGIC, "minix"},
        { DRIVE_FIXED, MINIX_SUPER_MAGIC2, "minix v2"},
        { DRIVE_FIXED, MINIX2_SUPER_MAGIC, "minix2"},
        { DRIVE_FIXED, MINIX2_SUPER_MAGIC2, "minix2 v2"},
        { DRIVE_FIXED, MINIX3_SUPER_MAGIC, "minix3"},
        { DRIVE_FIXED, MSDOS_SUPER_MAGIC, "msdos"},
        { DRIVE_REMOTE, NCP_SUPER_MAGIC, "ncp"},
        { DRIVE_REMOTE, NFS_SUPER_MAGIC, "nfs"},
        { DRIVE_FIXED, NTFS_SB_MAGIC, "ntfs"},
        { DRIVE_RAMDISK, OPENPROM_SUPER_MAGIC, "openpromfs"},
        { DRIVE_RAMDISK, PROC_SUPER_MAGIC, "proc"},
        { DRIVE_FIXED, QNX4_SUPER_MAGIC, "qnx4"},
        { DRIVE_FIXED, REISERFS_SUPER_MAGIC, "reiserfs"},
        { DRIVE_RAMDISK, ROMFS_MAGIC, "romfs"},
        { DRIVE_REMOTE, SMB_SUPER_MAGIC, "samba"},
        { DRIVE_RAMDISK, CGROUP_SUPER_MAGIC, "cgroupfs"},
        { DRIVE_RAMDISK, FUTEXFS_SUPER_MAGIC, "futexfs"},
        { DRIVE_FIXED, SYSV2_SUPER_MAGIC, "sysv2"},
        { DRIVE_FIXED, SYSV4_SUPER_MAGIC, "sysv4"},
        { DRIVE_RAMDISK, TMPFS_MAGIC, "tmpfs"},
        { DRIVE_RAMDISK, DEVPTS_SUPER_MAGIC, "devpts"},
        { DRIVE_CDROM, UDF_SUPER_MAGIC, "udf"},
        { DRIVE_FIXED, UFS_MAGIC, "ufs"},
        { DRIVE_FIXED, UFS_MAGIC_BW, "ufs"},
        { DRIVE_FIXED, UFS2_MAGIC, "ufs2"},
        { DRIVE_FIXED, UFS_CIGAM, "ufs"},
        { DRIVE_RAMDISK, USBDEVICE_SUPER_MAGIC, "usbdev"},
        { DRIVE_FIXED, XENIX_SUPER_MAGIC, "xenix"},
        { DRIVE_FIXED, XFS_SB_MAGIC, "xfs"},
        { DRIVE_RAMDISK, FUSE_SUPER_MAGIC, "fuse"},
        { DRIVE_FIXED, V9FS_MAGIC, "9p"},
        { DRIVE_REMOTE, CEPH_SUPER_MAGIC, "ceph"},
        { DRIVE_RAMDISK, CONFIGFS_MAGIC, "configfs"},
        { DRIVE_RAMDISK, ECRYPTFS_SUPER_MAGIC, "eCryptfs"},
        { DRIVE_FIXED, EXOFS_SUPER_MAGIC, "exofs"},
        { DRIVE_FIXED, VXFS_SUPER_MAGIC, "vxfs"},
        { DRIVE_FIXED, VXFS_OLT_MAGIC, "vxfs_olt"},
        { DRIVE_REMOTE, GFS2_MAGIC, "gfs2"},
        { DRIVE_FIXED, LOGFS_MAGIC_U32, "logfs"},
        { DRIVE_FIXED, OCFS2_SUPER_MAGIC, "ocfs2"},
        { DRIVE_FIXED, OMFS_MAGIC, "omfs"},
        { DRIVE_FIXED, UBIFS_SUPER_MAGIC, "ubifs"},
        { DRIVE_UNKNOWN, 0, NULL}
#else
        { DRIVE_RAMDISK, "ramfs"      },
        { DRIVE_RAMDISK, "tmpfs"      },
        { DRIVE_RAMDISK, "proc"       },
        { DRIVE_RAMDISK, "sysfs"      },
        { DRIVE_RAMDISK, "debugfs"    },
        { DRIVE_RAMDISK, "devpts"     },
        { DRIVE_RAMDISK, "securityfs" },
        { DRIVE_CDROM,   "iso9660"    },
        { DRIVE_FIXED,   "ext2"       },
        { DRIVE_FIXED,   "ext3"       },
        { DRIVE_FIXED,   "ext4"       },
        { DRIVE_FIXED,   "sysv"       },
        { DRIVE_FIXED,   "reiserfs"   },
        { DRIVE_FIXED,   "ufs"        },
        { DRIVE_FIXED,   "vfat"       },
        { DRIVE_FIXED,   "msdos"      },
        { DRIVE_FIXED,   "udf"        },
        { DRIVE_FIXED,   "hfs"        },
        { DRIVE_FIXED,   "hpfs"       },
        { DRIVE_FIXED,   "qnx4"       },
        { DRIVE_FIXED,   "ntfs"       },
        { DRIVE_FIXED,   "ntfs-3g"    },
        { DRIVE_REMOTE,  "smbfs"      },
        { DRIVE_REMOTE,  "fuse"       },
        { DRIVE_REMOTE,  "nfs"        },
        { DRIVE_REMOTE,  "nfs4"       },
        { DRIVE_REMOTE,  "cifs"       },
        { DRIVE_REMOTE,  "ncpfs"      },
        { DRIVE_REMOTE,  "coda"       },
        { DRIVE_REMOTE,  "afs"        },
        { DRIVE_UNKNOWN, NULL         }
#endif
};

#if __linux__
static guint32 _wapi_get_drive_type(long f_type)
{
        _wapi_drive_type *current;

        current = &_wapi_drive_types[0];
        while (current->drive_type != DRIVE_UNKNOWN) {
                if (current->fstypeid == f_type)
                        return current->drive_type;
                current++;
        }

        return DRIVE_UNKNOWN;
}
#else
static guint32 _wapi_get_drive_type(const gchar* fstype)
{
        _wapi_drive_type *current;

        current = &_wapi_drive_types[0];
        while (current->drive_type != DRIVE_UNKNOWN) {
                if (strcmp (current->fstype, fstype) == 0)
                        break;

                current++;
        }
        
        return current->drive_type;
}
#endif

#if defined (PLATFORM_MACOSX) || defined (__linux__)
static guint32
GetDriveTypeFromPath (const char *utf8_root_path_name)
{
        struct statfs buf;
        
        if (statfs (utf8_root_path_name, &buf) == -1)
                return DRIVE_UNKNOWN;
#if PLATFORM_MACOSX
        return _wapi_get_drive_type (buf.f_fstypename);
#else
        return _wapi_get_drive_type (buf.f_type);
#endif
}
#else
static guint32
GetDriveTypeFromPath (const gchar *utf8_root_path_name)
{
        guint32 drive_type;
        FILE *fp;
        gchar buffer [512];
        gchar **splitted;

        fp = fopen ("/etc/mtab", "rt");
        if (fp == NULL) {
                fp = fopen ("/etc/mnttab", "rt");
                if (fp == NULL) 
                        return(DRIVE_UNKNOWN);
        }

        drive_type = DRIVE_NO_ROOT_DIR;
        while (fgets (buffer, 512, fp) != NULL) {
                splitted = g_strsplit (buffer, " ", 0);
                if (!*splitted || !*(splitted + 1) || !*(splitted + 2)) {
                        g_strfreev (splitted);
                        continue;
                }

                /* compare given root_path_name with the one from mtab, 
                  if length of utf8_root_path_name is zero it must be the root dir */
                if (strcmp (*(splitted + 1), utf8_root_path_name) == 0 ||
                    (strcmp (*(splitted + 1), "/") == 0 && strlen (utf8_root_path_name) == 0)) {
                        drive_type = _wapi_get_drive_type (*(splitted + 2));
                        /* it is possible this path might be mounted again with
                           a known type...keep looking */
                        if (drive_type != DRIVE_UNKNOWN) {
                                g_strfreev (splitted);
                                break;
                        }
                }

                g_strfreev (splitted);
        }

        fclose (fp);
        return drive_type;
}
#endif

guint32 GetDriveType(const gunichar2 *root_path_name)
{
        gchar *utf8_root_path_name;
        guint32 drive_type;

        if (root_path_name == NULL) {
                utf8_root_path_name = g_strdup (g_get_current_dir());
                if (utf8_root_path_name == NULL) {
                        return(DRIVE_NO_ROOT_DIR);
                }
        }
        else {
                utf8_root_path_name = mono_unicode_to_external (root_path_name);
                if (utf8_root_path_name == NULL) {
                        DEBUG("%s: unicode conversion returned NULL", __func__);
                        return(DRIVE_NO_ROOT_DIR);
                }
                
                /* strip trailing slash for compare below */
                if (g_str_has_suffix(utf8_root_path_name, "/") && utf8_root_path_name [1] != 0) {
                        utf8_root_path_name[strlen(utf8_root_path_name) - 1] = 0;
                }
        }
        drive_type = GetDriveTypeFromPath (utf8_root_path_name);
        g_free (utf8_root_path_name);

        return (drive_type);
}

#if defined (PLATFORM_MACOSX) || defined (__linux__) || defined(PLATFORM_BSD) || defined(__native_client__) || defined(__FreeBSD_kernel__)
static gchar*
get_fstypename (gchar *utfpath)
{
#if defined (PLATFORM_MACOSX) || defined (__linux__)
        struct statfs stat;
#if __linux__
        _wapi_drive_type *current;
#endif
        if (statfs (utfpath, &stat) == -1)
                return NULL;
#if PLATFORM_MACOSX
        return g_strdup (stat.f_fstypename);
#else
        current = &_wapi_drive_types[0];
        while (current->drive_type != DRIVE_UNKNOWN) {
                if (stat.f_type == current->fstypeid)
                        return g_strdup (current->fstype);
                current++;
        }
        return NULL;
#endif
#else
        return NULL;
#endif
}

/* Linux has struct statfs which has a different layout */
gboolean
GetVolumeInformation (const gunichar2 *path, gunichar2 *volumename, int volumesize, int *outserial, int *maxcomp, int *fsflags, gunichar2 *fsbuffer, int fsbuffersize)
{
        gchar *utfpath;
        gchar *fstypename;
        gboolean status = FALSE;
        glong len;
        
        // We only support getting the file system type
        if (fsbuffer == NULL)
                return 0;
        
        utfpath = mono_unicode_to_external (path);
        if ((fstypename = get_fstypename (utfpath)) != NULL){
                gunichar2 *ret = g_utf8_to_utf16 (fstypename, -1, NULL, &len, NULL);
                if (ret != NULL && len < fsbuffersize){
                        memcpy (fsbuffer, ret, len * sizeof (gunichar2));
                        fsbuffer [len] = 0;
                        status = TRUE;
                }
                if (ret != NULL)
                        g_free (ret);
                g_free (fstypename);
        }
        g_free (utfpath);
        return status;
}
#endif


void
_wapi_io_init (void)
{
        mono_mutex_init (&stdhandle_mutex);
}