support/unistd.c

   1 /*
   2  * <unistd.h> wrapper functions.
   3  *
   4  * Authors:
   5  *   Jonathan Pryor (jonpryor@vt.edu)
   6  *
   7  * Copyright (C) 2004-2006 Jonathan Pryor
   8  */
   9
  10 #ifndef _GNU_SOURCE
  11 #define _GNU_SOURCE
  12 #endif /* ndef _GNU_SOURCE */
  13
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <string.h>     /* for swab(3) on Mac OS X */
  21
  22 #include "map.h"
  23 #include "mph.h"
  24
  25 G_BEGIN_DECLS
  26
  27 mph_off_t
  28 Mono_Posix_Syscall_lseek (gint32 fd, mph_off_t offset, gint32 whence)
  29 {
  30         mph_return_if_off_t_overflow (offset);
  31
  32         return lseek (fd, offset, whence);
  33 }
  34
  35 mph_ssize_t
  36 Mono_Posix_Syscall_read (gint32 fd, void *buf, mph_size_t count)
  37 {
  38         mph_return_if_size_t_overflow (count);
  39         return read (fd, buf, (size_t) count);
  40 }
  41
  42 mph_ssize_t
  43 Mono_Posix_Syscall_write (gint32 fd, void *buf, mph_size_t count)
  44 {
  45         mph_return_if_size_t_overflow (count);
  46         return write (fd, buf, (size_t) count);
  47 }
  48
  49 mph_ssize_t
  50 Mono_Posix_Syscall_pread (gint32 fd, void *buf, mph_size_t count, mph_off_t offset)
  51 {
  52         mph_return_if_size_t_overflow (count);
  53         mph_return_if_off_t_overflow (offset);
  54
  55         return pread (fd, buf, (size_t) count, (off_t) offset);
  56 }
  57
  58 mph_ssize_t
  59 Mono_Posix_Syscall_pwrite (gint32 fd, void *buf, mph_size_t count, mph_off_t offset)
  60 {
  61         mph_return_if_size_t_overflow (count);
  62         mph_return_if_off_t_overflow (offset);
  63
  64         return pwrite (fd, buf, (size_t) count, (off_t) offset);
  65 }
  66
  67 gint32
  68 Mono_Posix_Syscall_pipe (gint32 *reading, gint32 *writing)
  69 {
  70         int filedes[2] = {-1, -1};
  71         int r;
  72
  73         if (reading == NULL || writing == NULL) {
  74                 errno = EFAULT;
  75                 return -1;
  76         }
  77
  78         r = pipe (filedes);
  79
  80         *reading = filedes[0];
  81         *writing = filedes[1];
  82         return r;
  83 }
  84
  85 void*
  86 Mono_Posix_Syscall_getcwd (char *buf, mph_size_t size)
  87 {
  88         mph_return_val_if_size_t_overflow (size, NULL);
  89         return getcwd (buf, (size_t) size);
  90 }
  91
  92 gint64
  93 Mono_Posix_Syscall_fpathconf (int filedes, int name, int defaultError)
  94 {
  95         errno = defaultError;
  96         if (Mono_Posix_FromPathconfName (name, &name) == -1)
  97                 return -1;
  98         return fpathconf (filedes, name);
  99 }
 100
 101 gint64
 102 Mono_Posix_Syscall_pathconf (const char *path, int name, int defaultError)
 103 {
 104         errno = defaultError;
 105         if (Mono_Posix_FromPathconfName (name, &name) == -1)
 106                 return -1;
 107         return pathconf (path, name);
 108 }
 109
 110 gint64
 111 Mono_Posix_Syscall_sysconf (int name, int defaultError)
 112 {
 113         errno = defaultError;
 114         if (Mono_Posix_FromSysconfName (name, &name) == -1)
 115                 return -1;
 116         return sysconf (name);
 117 }
 118
 119 #if HAVE_CONFSTR
 120 mph_size_t
 121 Mono_Posix_Syscall_confstr (int name, char *buf, mph_size_t len)
 122 {
 123         mph_return_if_size_t_overflow (len);
 124         if (Mono_Posix_FromConfstrName (name, &name) == -1)
 125                 return -1;
 126         return confstr (name, buf, (size_t) len);
 127 }
 128 #endif  /* def HAVE_CONFSTR */
 129
 130 #ifdef HAVE_TTYNAME_R
 131 gint32
 132 Mono_Posix_Syscall_ttyname_r (int fd, char *buf, mph_size_t len)
 133 {
 134         mph_return_if_size_t_overflow (len);
 135         return ttyname_r (fd, buf, (size_t) len);
 136 }
 137 #endif /* ndef HAVE_TTYNAME_R */
 138
 139 gint32
 140 Mono_Posix_Syscall_readlink (const char *path, char *buf, mph_size_t len)
 141 {
 142         int r;
 143         mph_return_if_size_t_overflow (len);
 144         r = readlink (path, buf, (size_t) len);
 145         if (r >= 0 && r < len)
 146                 buf [r] = '\0';
 147         return r;
 148 }
 149
 150 #if HAVE_GETLOGIN_R
 151 gint32
 152 Mono_Posix_Syscall_getlogin_r (char *buf, mph_size_t len)
 153 {
 154         mph_return_if_size_t_overflow (len);
 155         return getlogin_r (buf, (size_t) len);
 156 }
 157 #endif  /* def HAVE_GETLOGIN_R */
 158
 159 gint32
 160 Mono_Posix_Syscall_gethostname (char *buf, mph_size_t len)
 161 {
 162         mph_return_if_size_t_overflow (len);
 163         return gethostname (buf, (size_t) len);
 164 }
 165
 166 #if HAVE_SETHOSTNAME
 167 gint32
 168 Mono_Posix_Syscall_sethostname (const char *name, mph_size_t len)
 169 {
 170         mph_return_if_size_t_overflow (len);
 171         return sethostname (name, (size_t) len);
 172 }
 173 #endif  /* def HAVE_SETHOSTNAME */
 174
 175 #if HAVE_GETHOSTID
 176 gint64
 177 Mono_Posix_Syscall_gethostid (void)
 178 {
 179         return gethostid ();
 180 }
 181 #endif  /* def HAVE_GETHOSTID */
 182
 183 #ifdef HAVE_SETHOSTID
 184 gint32
 185 Mono_Posix_Syscall_sethostid (gint64 hostid)
 186 {
 187         mph_return_if_long_overflow (hostid);
 188 #ifdef MPH_ON_BSD
 189         sethostid ((long) hostid);
 190         return 0;
 191 #else
 192         return sethostid ((long) hostid);
 193 #endif
 194 }
 195 #endif /* def HAVE_SETHOSTID */
 196
 197 #ifdef HAVE_GETDOMAINNAME
 198 gint32
 199 Mono_Posix_Syscall_getdomainname (char *name, mph_size_t len)
 200 {
 201         mph_return_if_size_t_overflow (len);
 202         return getdomainname (name, (size_t) len);
 203 }
 204 #endif /* def HAVE_GETDOMAINNAME */
 205
 206 #ifdef HAVE_SETDOMAINNAME
 207 gint32
 208 Mono_Posix_Syscall_setdomainname (const char *name, mph_size_t len)
 209 {
 210         mph_return_if_size_t_overflow (len);
 211         return setdomainname (name, (size_t) len);
 212 }
 213 #endif /* def HAVE_SETDOMAINNAME */
 214
 215 /* Android implements truncate, but doesn't declare it.
 216  * Result is a warning during compilation, so skip it.
 217  */
 218 #ifndef PLATFORM_ANDROID
 219 gint32
 220 Mono_Posix_Syscall_truncate (const char *path, mph_off_t length)
 221 {
 222         mph_return_if_off_t_overflow (length);
 223         return truncate (path, (off_t) length);
 224 }
 225 #endif
 226
 227 gint32
 228 Mono_Posix_Syscall_ftruncate (int fd, mph_off_t length)
 229 {
 230         mph_return_if_off_t_overflow (length);
 231         return ftruncate (fd, (off_t) length);
 232 }
 233
 234 #if HAVE_LOCKF
 235 gint32
 236 Mono_Posix_Syscall_lockf (int fd, int cmd, mph_off_t len)
 237 {
 238         mph_return_if_off_t_overflow (len);
 239         if (Mono_Posix_FromLockfCommand (cmd, &cmd) == -1)
 240                 return -1;
 241         return lockf (fd, cmd, (off_t) len);
 242 }
 243 #endif  /* def HAVE_LOCKF */
 244
 245 #if HAVE_SWAB
 246 int
 247 Mono_Posix_Syscall_swab (void *from, void *to, mph_ssize_t n)
 248 {
 249         if (mph_have_long_overflow (n))
 250                 return -1;
 251         swab (from, to, (ssize_t) n);
 252         return 0;
 253 }
 254 #endif  /* def HAVE_SWAB */
 255
 256 #if HAVE_SETUSERSHELL
 257 int
 258 Mono_Posix_Syscall_setusershell (void)
 259 {
 260         setusershell ();
 261         return 0;
 262 }
 263 #endif  /* def HAVE_SETUSERSHELL */
 264
 265 #if HAVE_ENDUSERSHELL
 266 int
 267 Mono_Posix_Syscall_endusershell (void)
 268 {
 269         endusershell ();
 270         return 0;
 271 }
 272 #endif  /* def HAVE_ENDUSERSHELL */
 273
 274 int
 275 Mono_Posix_Syscall_sync (void)
 276 {
 277         sync ();
 278         return 0;
 279 }
 280
 281
 282 G_END_DECLS
 283
 284 /*
 285  * vim: noexpandtab
 286  */