posix/bits/unistd.h

   1 /* Checking macros for unistd functions.
   2    Copyright (C) 2005, 2006, 2007 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _UNISTD_H
  21 # error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
  22 #endif
  23
  24 extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
  25                            size_t __buflen) __wur;
  26 extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
  27                                           size_t __nbytes), read) __wur;
  28
  29 __extern_always_inline __wur ssize_t
  30 read (int __fd, void *__buf, size_t __nbytes)
  31 {
  32   if (__bos0 (__buf) != (size_t) -1
  33       && (!__builtin_constant_p (__nbytes) || __nbytes > __bos0 (__buf)))
  34     return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
  35   return __read_alias (__fd, __buf, __nbytes);
  36 }
  37
  38 #ifdef __USE_UNIX98
  39 extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
  40                             __off_t __offset, size_t __bufsize) __wur;
  41 extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
  42                               __off64_t __offset, size_t __bufsize) __wur;
  43 extern ssize_t __REDIRECT (__pread_alias,
  44                            (int __fd, void *__buf, size_t __nbytes,
  45                             __off_t __offset), pread) __wur;
  46 extern ssize_t __REDIRECT (__pread64_alias,
  47                            (int __fd, void *__buf, size_t __nbytes,
  48                             __off64_t __offset), pread64) __wur;
  49
  50 # ifndef __USE_FILE_OFFSET64
  51 __extern_always_inline __wur ssize_t
  52 pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
  53 {
  54   if (__bos0 (__buf) != (size_t) -1
  55       && (!__builtin_constant_p (__nbytes) || __nbytes > __bos0 (__buf)))
  56     return __pread_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  57   return __pread_alias (__fd, __buf, __nbytes, __offset);
  58 }
  59 # else
  60 __extern_always_inline __wur ssize_t
  61 pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
  62 {
  63   if (__bos0 (__buf) != (size_t) -1
  64       && (!__builtin_constant_p (__nbytes) || __nbytes > __bos0 (__buf)))
  65     return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  66   return __pread64_alias (__fd, __buf, __nbytes, __offset);
  67 }
  68 # endif
  69
  70 # ifdef __USE_LARGEFILE64
  71 __extern_always_inline __wur ssize_t
  72 pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
  73 {
  74   if (__bos0 (__buf) != (size_t) -1
  75       && (!__builtin_constant_p (__nbytes) || __nbytes > __bos0 (__buf)))
  76     return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  77   return __pread64_alias (__fd, __buf, __nbytes, __offset);
  78 }
  79 # endif
  80 #endif
  81
  82 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
  83 extern ssize_t __readlink_chk (__const char *__restrict __path,
  84                                char *__restrict __buf, size_t __len,
  85                                size_t __buflen)
  86      __THROW __nonnull ((1, 2)) __wur;
  87 extern ssize_t __REDIRECT_NTH (__readlink_alias,
  88                                (__const char *__restrict __path,
  89                                 char *__restrict __buf, size_t __len), readlink)
  90      __nonnull ((1, 2)) __wur;
  91
  92 __extern_always_inline __nonnull ((1, 2)) __wur ssize_t
  93 __NTH (readlink (__const char *__restrict __path, char *__restrict __buf,
  94                  size_t __len))
  95 {
  96   if (__bos (__buf) != (size_t) -1
  97       && (!__builtin_constant_p (__len) || __len > __bos (__buf)))
  98     return __readlink_chk (__path, __buf, __len, __bos (__buf));
  99   return __readlink_alias (__path, __buf, __len);
 100 }
 101 #endif
 102
 103 #ifdef __USE_ATFILE
 104 extern ssize_t __readlinkat_chk (int __fd, __const char *__restrict __path,
 105                                  char *__restrict __buf, size_t __len,
 106                                  size_t __buflen)
 107      __THROW __nonnull ((2, 3)) __wur;
 108 extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
 109                                (int __fd, __const char *__restrict __path,
 110                                 char *__restrict __buf, size_t __len),
 111                                readlinkat)
 112      __nonnull ((2, 3)) __wur;
 113
 114 __extern_always_inline __nonnull ((2, 3)) __wur ssize_t
 115 __NTH (readlinkat (int __fd, __const char *__restrict __path,
 116                    char *__restrict __buf, size_t __len))
 117 {
 118   if (__bos (__buf) != (size_t) -1
 119       && (!__builtin_constant_p (__len) || __len > __bos (__buf)))
 120     return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
 121   return __readlinkat_alias (__fd, __path, __buf, __len);
 122 }
 123 #endif
 124
 125 extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
 126      __THROW __wur;
 127 extern char *__REDIRECT_NTH (__getcwd_alias,
 128                              (char *__buf, size_t __size), getcwd) __wur;
 129
 130 __extern_always_inline __wur char *
 131 __NTH (getcwd (char *__buf, size_t __size))
 132 {
 133   if (__bos (__buf) != (size_t) -1
 134       && (!__builtin_constant_p (__size) || __size > __bos (__buf)))
 135     return __getcwd_chk (__buf, __size, __bos (__buf));
 136   return __getcwd_alias (__buf, __size);
 137 }
 138
 139 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 140 extern char *__getwd_chk (char *__buf, size_t buflen)
 141      __THROW __nonnull ((1)) __wur;
 142 extern char *__REDIRECT_NTH (__getwd_alias, (char *__buf), getwd)
 143      __nonnull ((1)) __wur;
 144
 145 __extern_always_inline __nonnull ((1)) __attribute_deprecated__ __wur char *
 146 __NTH (getwd (char *__buf))
 147 {
 148   if (__bos (__buf) != (size_t) -1)
 149     return __getwd_chk (__buf, __bos (__buf));
 150   return __getwd_alias (__buf);
 151 }
 152 #endif
 153
 154 extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
 155                              size_t __buflen) __THROW;
 156 extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
 157                                                 size_t __len), confstr);
 158
 159 __extern_always_inline size_t
 160 __NTH (confstr (int __name, char *__buf, size_t __len))
 161 {
 162   if (__bos (__buf) != (size_t) -1
 163       && (!__builtin_constant_p (__len) || __bos (__buf) < __len))
 164     return __confstr_chk (__name, __buf, __len, __bos (__buf));
 165   return __confstr_alias (__name, __buf, __len);
 166 }
 167
 168
 169 extern int __getgroups_chk (int __size, __gid_t __list[], size_t listlen)
 170      __THROW __wur;
 171 extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
 172                            getgroups) __wur;
 173
 174 __extern_always_inline int
 175 __NTH (getgroups (int __size, __gid_t __list[]))
 176 {
 177   if (__bos (__list) != (size_t) -1
 178       && (!__builtin_constant_p (__size)
 179           || __size * sizeof (__gid_t) > __bos (__list)))
 180     return __getgroups_chk (__size, __list, __bos (__list));
 181   return __getgroups_alias (__size, __list);
 182 }
 183
 184
 185 extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
 186                             size_t __nreal) __THROW __nonnull ((2));
 187 extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
 188                                                size_t __buflen), ttyname_r)
 189      __nonnull ((2));
 190
 191 __extern_always_inline int
 192 __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
 193 {
 194   if (__bos (__buf) != (size_t) -1
 195       && (!__builtin_constant_p (__buflen) || __buflen > __bos (__buf)))
 196     return __ttyname_r_chk (__fd, __buf, __buflen, __bos (__buf));
 197   return __ttyname_r_alias (__fd, __buf, __buflen);
 198 }
 199
 200
 201 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 202 extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
 203      __nonnull ((1));
 204 extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
 205                        getlogin_r) __nonnull ((1));
 206
 207 __extern_always_inline int
 208 getlogin_r (char *__buf, size_t __buflen)
 209 {
 210   if (__bos (__buf) != (size_t) -1
 211       && (!__builtin_constant_p (__buflen) || __buflen > __bos (__buf)))
 212     return __getlogin_r_chk (__buf, __buflen, __bos (__buf));
 213   return __getlogin_r_alias (__buf, __buflen);
 214 }
 215 #endif
 216
 217
 218 #if defined __USE_BSD || defined __USE_UNIX98
 219 extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
 220      __THROW __nonnull ((1));
 221 extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
 222                            gethostname) __nonnull ((1));
 223
 224 __extern_always_inline int
 225 __NTH (gethostname (char *__buf, size_t __buflen))
 226 {
 227   if (__bos (__buf) != (size_t) -1
 228       && (!__builtin_constant_p (__buflen) || __buflen > __bos (__buf)))
 229     return __gethostname_chk (__buf, __buflen, __bos (__buf));
 230   return __gethostname_alias (__buf, __buflen);
 231 }
 232 #endif
 233
 234
 235 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
 236 extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
 237      __THROW __nonnull ((1)) __wur;
 238 extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
 239                                                    size_t __buflen),
 240                            getdomainname) __nonnull ((1)) __wur;
 241
 242 __extern_always_inline int
 243 __NTH (getdomainname (char *__buf, size_t __buflen))
 244 {
 245   if (__bos (__buf) != (size_t) -1
 246       && (!__builtin_constant_p (__buflen) || __buflen > __bos (__buf)))
 247     return __getdomainname_chk (__buf, __buflen, __bos (__buf));
 248   return __getdomainname_alias (__buf, __buflen);
 249 }
 250 #endif