mono/io-layer/posix.c

   1 /*
   2  * posix.c:  Posix-specific support.
   3  *
   4  * Author:
   5  *      Dick Porter (dick@ximian.com)
   6  *
   7  * (C) 2002 Ximian, Inc.
   8  * Copyright (c) 2002-2009 Novell, Inc.
   9  * Copyright 2011 Xamarin Inc
  10  */
  11
  12 #include <config.h>
  13 #include <glib.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <errno.h>
  17 #include <string.h>
  18 #include <sys/stat.h>
  19 #include <sys/types.h>
  20 #include <stdio.h>
  21
  22 #include <mono/io-layer/wapi.h>
  23 #include <mono/io-layer/wapi-private.h>
  24 #include <mono/io-layer/handles-private.h>
  25 #include <mono/io-layer/io-private.h>
  26
  27 #if 0
  28 #define DEBUG(...) g_message(__VA_ARGS__)
  29 #else
  30 #define DEBUG(...)
  31 #endif
  32
  33 static guint32
  34 convert_from_flags(int flags)
  35 {
  36         guint32 fileaccess=0;
  37
  38 #ifndef O_ACCMODE
  39 #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
  40 #endif
  41
  42         if((flags & O_ACCMODE) == O_RDONLY) {
  43                 fileaccess=GENERIC_READ;
  44         } else if ((flags & O_ACCMODE) == O_WRONLY) {
  45                 fileaccess=GENERIC_WRITE;
  46         } else if ((flags & O_ACCMODE) == O_RDWR) {
  47                 fileaccess=GENERIC_READ|GENERIC_WRITE;
  48         } else {
  49                 DEBUG("%s: Can't figure out flags 0x%x", __func__, flags);
  50         }
  51
  52         /* Maybe sort out create mode too */
  53
  54         return(fileaccess);
  55 }
  56
  57
  58 gpointer _wapi_stdhandle_create (int fd, const gchar *name)
  59 {
  60         struct _WapiHandle_file file_handle = {0};
  61         gpointer handle;
  62         int flags;
  63
  64         DEBUG("%s: creating standard handle type %s, fd %d", __func__,
  65                   name, fd);
  66
  67 #if !defined(__native_client__)
  68         /* Check if fd is valid */
  69         do {
  70                 flags=fcntl(fd, F_GETFL);
  71         } while (flags == -1 && errno == EINTR);
  72
  73         if(flags==-1) {
  74                 /* Invalid fd.  Not really much point checking for EBADF
  75                  * specifically
  76                  */
  77                 DEBUG("%s: fcntl error on fd %d: %s", __func__, fd,
  78                           strerror(errno));
  79
  80                 SetLastError (_wapi_get_win32_file_error (errno));
  81                 return(INVALID_HANDLE_VALUE);
  82         }
  83         file_handle.fileaccess=convert_from_flags(flags);
  84 #else
  85         /*
  86          * fcntl will return -1 in nacl, as there is no real file system API.
  87          * Yet, standard streams are available.
  88          */
  89         file_handle.fileaccess = (fd == STDIN_FILENO) ? GENERIC_READ : GENERIC_WRITE;
  90 #endif
  91
  92         file_handle.fd = fd;
  93         file_handle.filename = g_strdup(name);
  94         /* some default security attributes might be needed */
  95         file_handle.security_attributes=0;
  96
  97         /* Apparently input handles can't be written to.  (I don't
  98          * know if output or error handles can't be read from.)
  99          */
 100         if (fd == 0) {
 101                 file_handle.fileaccess &= ~GENERIC_WRITE;
 102         }
 103
 104         file_handle.sharemode=0;
 105         file_handle.attrs=0;
 106
 107         handle = _wapi_handle_new_fd (WAPI_HANDLE_CONSOLE, fd, &file_handle);
 108         if (handle == _WAPI_HANDLE_INVALID) {
 109                 g_warning ("%s: error creating file handle", __func__);
 110                 SetLastError (ERROR_GEN_FAILURE);
 111                 return(INVALID_HANDLE_VALUE);
 112         }
 113
 114         DEBUG("%s: returning handle %p", __func__, handle);
 115
 116         return(handle);
 117 }
 118