posix/bits/unistd.h

   1 /* Checking macros for unistd functions.
   2    Copyright (C) 2005-2016 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _UNISTD_H
  20 # error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
  21 #endif
  22
  23 extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
  24                            size_t __buflen) __wur;
  25 extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
  26                                           size_t __nbytes), read) __wur;
  27 extern ssize_t __REDIRECT (__read_chk_warn,
  28                            (int __fd, void *__buf, size_t __nbytes,
  29                             size_t __buflen), __read_chk)
  30      __wur __warnattr ("read called with bigger length than size of "
  31                        "the destination buffer");
  32
  33 __fortify_function __wur ssize_t
  34 read (int __fd, void *__buf, size_t __nbytes)
  35 {
  36   if (__bos0 (__buf) != (size_t) -1)
  37     {
  38       if (!__builtin_constant_p (__nbytes))
  39         return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
  40
  41       if (__nbytes > __bos0 (__buf))
  42         return __read_chk_warn (__fd, __buf, __nbytes, __bos0 (__buf));
  43     }
  44   return __read_alias (__fd, __buf, __nbytes);
  45 }
  46
  47 #ifdef __USE_UNIX98
  48 extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
  49                             __off_t __offset, size_t __bufsize) __wur;
  50 extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
  51                               __off64_t __offset, size_t __bufsize) __wur;
  52 extern ssize_t __REDIRECT (__pread_alias,
  53                            (int __fd, void *__buf, size_t __nbytes,
  54                             __off_t __offset), pread) __wur;
  55 extern ssize_t __REDIRECT (__pread64_alias,
  56                            (int __fd, void *__buf, size_t __nbytes,
  57                             __off64_t __offset), pread64) __wur;
  58 extern ssize_t __REDIRECT (__pread_chk_warn,
  59                            (int __fd, void *__buf, size_t __nbytes,
  60                             __off_t __offset, size_t __bufsize), __pread_chk)
  61      __wur __warnattr ("pread called with bigger length than size of "
  62                        "the destination buffer");
  63 extern ssize_t __REDIRECT (__pread64_chk_warn,
  64                            (int __fd, void *__buf, size_t __nbytes,
  65                             __off64_t __offset, size_t __bufsize),
  66                             __pread64_chk)
  67      __wur __warnattr ("pread64 called with bigger length than size of "
  68                        "the destination buffer");
  69
  70 # ifndef __USE_FILE_OFFSET64
  71 __fortify_function __wur ssize_t
  72 pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
  73 {
  74   if (__bos0 (__buf) != (size_t) -1)
  75     {
  76       if (!__builtin_constant_p (__nbytes))
  77         return __pread_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  78
  79       if ( __nbytes > __bos0 (__buf))
  80         return __pread_chk_warn (__fd, __buf, __nbytes, __offset,
  81                                  __bos0 (__buf));
  82     }
  83   return __pread_alias (__fd, __buf, __nbytes, __offset);
  84 }
  85 # else
  86 __fortify_function __wur ssize_t
  87 pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
  88 {
  89   if (__bos0 (__buf) != (size_t) -1)
  90     {
  91       if (!__builtin_constant_p (__nbytes))
  92         return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
  93
  94       if ( __nbytes > __bos0 (__buf))
  95         return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
  96                                    __bos0 (__buf));
  97     }
  98
  99   return __pread64_alias (__fd, __buf, __nbytes, __offset);
 100 }
 101 # endif
 102
 103 # ifdef __USE_LARGEFILE64
 104 __fortify_function __wur ssize_t
 105 pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
 106 {
 107   if (__bos0 (__buf) != (size_t) -1)
 108     {
 109       if (!__builtin_constant_p (__nbytes))
 110         return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
 111
 112       if ( __nbytes > __bos0 (__buf))
 113         return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
 114                                    __bos0 (__buf));
 115     }
 116
 117   return __pread64_alias (__fd, __buf, __nbytes, __offset);
 118 }
 119 # endif
 120 #endif
 121
 122 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
 123 extern ssize_t __readlink_chk (const char *__restrict __path,
 124                                char *__restrict __buf, size_t __len,
 125                                size_t __buflen)
 126      __THROW __nonnull ((1, 2)) __wur;
 127 extern ssize_t __REDIRECT_NTH (__readlink_alias,
 128                                (const char *__restrict __path,
 129                                 char *__restrict __buf, size_t __len), readlink)
 130      __nonnull ((1, 2)) __wur;
 131 extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
 132                                (const char *__restrict __path,
 133                                 char *__restrict __buf, size_t __len,
 134                                 size_t __buflen), __readlink_chk)
 135      __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
 136                                           "than size of destination buffer");
 137
 138 __fortify_function __nonnull ((1, 2)) __wur ssize_t
 139 __NTH (readlink (const char *__restrict __path, char *__restrict __buf,
 140                  size_t __len))
 141 {
 142   if (__bos (__buf) != (size_t) -1)
 143     {
 144       if (!__builtin_constant_p (__len))
 145         return __readlink_chk (__path, __buf, __len, __bos (__buf));
 146
 147       if ( __len > __bos (__buf))
 148         return __readlink_chk_warn (__path, __buf, __len, __bos (__buf));
 149     }
 150   return __readlink_alias (__path, __buf, __len);
 151 }
 152 #endif
 153
 154 #ifdef __USE_ATFILE
 155 extern ssize_t __readlinkat_chk (int __fd, const char *__restrict __path,
 156                                  char *__restrict __buf, size_t __len,
 157                                  size_t __buflen)
 158      __THROW __nonnull ((2, 3)) __wur;
 159 extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
 160                                (int __fd, const char *__restrict __path,
 161                                 char *__restrict __buf, size_t __len),
 162                                readlinkat)
 163      __nonnull ((2, 3)) __wur;
 164 extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
 165                                (int __fd, const char *__restrict __path,
 166                                 char *__restrict __buf, size_t __len,
 167                                 size_t __buflen), __readlinkat_chk)
 168      __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
 169                                           "length than size of destination "
 170                                           "buffer");
 171
 172 __fortify_function __nonnull ((2, 3)) __wur ssize_t
 173 __NTH (readlinkat (int __fd, const char *__restrict __path,
 174                    char *__restrict __buf, size_t __len))
 175 {
 176   if (__bos (__buf) != (size_t) -1)
 177     {
 178       if (!__builtin_constant_p (__len))
 179         return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
 180
 181       if (__len > __bos (__buf))
 182         return __readlinkat_chk_warn (__fd, __path, __buf, __len,
 183                                       __bos (__buf));
 184     }
 185   return __readlinkat_alias (__fd, __path, __buf, __len);
 186 }
 187 #endif
 188
 189 extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
 190      __THROW __wur;
 191 extern char *__REDIRECT_NTH (__getcwd_alias,
 192                              (char *__buf, size_t __size), getcwd) __wur;
 193 extern char *__REDIRECT_NTH (__getcwd_chk_warn,
 194                              (char *__buf, size_t __size, size_t __buflen),
 195                              __getcwd_chk)
 196      __wur __warnattr ("getcwd caller with bigger length than size of "
 197                        "destination buffer");
 198
 199 __fortify_function __wur char *
 200 __NTH (getcwd (char *__buf, size_t __size))
 201 {
 202   if (__bos (__buf) != (size_t) -1)
 203     {
 204       if (!__builtin_constant_p (__size))
 205         return __getcwd_chk (__buf, __size, __bos (__buf));
 206
 207       if (__size > __bos (__buf))
 208         return __getcwd_chk_warn (__buf, __size, __bos (__buf));
 209     }
 210   return __getcwd_alias (__buf, __size);
 211 }
 212
 213 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 214 extern char *__getwd_chk (char *__buf, size_t buflen)
 215      __THROW __nonnull ((1)) __wur;
 216 extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
 217      __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
 218                                        "doesn't specify buffer size");
 219
 220 __fortify_function __nonnull ((1)) __attribute_deprecated__ __wur char *
 221 __NTH (getwd (char *__buf))
 222 {
 223   if (__bos (__buf) != (size_t) -1)
 224     return __getwd_chk (__buf, __bos (__buf));
 225   return __getwd_warn (__buf);
 226 }
 227 #endif
 228
 229 extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
 230                              size_t __buflen) __THROW;
 231 extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
 232                                                 size_t __len), confstr);
 233 extern size_t __REDIRECT_NTH (__confstr_chk_warn,
 234                               (int __name, char *__buf, size_t __len,
 235                                size_t __buflen), __confstr_chk)
 236      __warnattr ("confstr called with bigger length than size of destination "
 237                  "buffer");
 238
 239 __fortify_function size_t
 240 __NTH (confstr (int __name, char *__buf, size_t __len))
 241 {
 242   if (__bos (__buf) != (size_t) -1)
 243     {
 244       if (!__builtin_constant_p (__len))
 245         return __confstr_chk (__name, __buf, __len, __bos (__buf));
 246
 247       if (__bos (__buf) < __len)
 248         return __confstr_chk_warn (__name, __buf, __len, __bos (__buf));
 249     }
 250   return __confstr_alias (__name, __buf, __len);
 251 }
 252
 253
 254 extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
 255      __THROW __wur;
 256 extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
 257                            getgroups) __wur;
 258 extern int __REDIRECT_NTH (__getgroups_chk_warn,
 259                            (int __size, __gid_t __list[], size_t __listlen),
 260                            __getgroups_chk)
 261      __wur __warnattr ("getgroups called with bigger group count than what "
 262                        "can fit into destination buffer");
 263
 264 __fortify_function int
 265 __NTH (getgroups (int __size, __gid_t __list[]))
 266 {
 267   if (__bos (__list) != (size_t) -1)
 268     {
 269       if (!__builtin_constant_p (__size) || __size < 0)
 270         return __getgroups_chk (__size, __list, __bos (__list));
 271
 272       if (__size * sizeof (__gid_t) > __bos (__list))
 273         return __getgroups_chk_warn (__size, __list, __bos (__list));
 274     }
 275   return __getgroups_alias (__size, __list);
 276 }
 277
 278
 279 extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
 280                             size_t __nreal) __THROW __nonnull ((2));
 281 extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
 282                                                size_t __buflen), ttyname_r)
 283      __nonnull ((2));
 284 extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
 285                            (int __fd, char *__buf, size_t __buflen,
 286                             size_t __nreal), __ttyname_r_chk)
 287      __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
 288                                  "size of destination buffer");
 289
 290 __fortify_function int
 291 __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
 292 {
 293   if (__bos (__buf) != (size_t) -1)
 294     {
 295       if (!__builtin_constant_p (__buflen))
 296         return __ttyname_r_chk (__fd, __buf, __buflen, __bos (__buf));
 297
 298       if (__buflen > __bos (__buf))
 299         return __ttyname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
 300     }
 301   return __ttyname_r_alias (__fd, __buf, __buflen);
 302 }
 303
 304
 305 #if defined __USE_REENTRANT || defined __USE_POSIX199506
 306 extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
 307      __nonnull ((1));
 308 extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
 309                        getlogin_r) __nonnull ((1));
 310 extern int __REDIRECT (__getlogin_r_chk_warn,
 311                        (char *__buf, size_t __buflen, size_t __nreal),
 312                        __getlogin_r_chk)
 313      __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
 314                                  "size of destination buffer");
 315
 316 __fortify_function int
 317 getlogin_r (char *__buf, size_t __buflen)
 318 {
 319   if (__bos (__buf) != (size_t) -1)
 320     {
 321       if (!__builtin_constant_p (__buflen))
 322         return __getlogin_r_chk (__buf, __buflen, __bos (__buf));
 323
 324       if (__buflen > __bos (__buf))
 325         return __getlogin_r_chk_warn (__buf, __buflen, __bos (__buf));
 326     }
 327   return __getlogin_r_alias (__buf, __buflen);
 328 }
 329 #endif
 330
 331
 332 #if defined __USE_MISC || defined __USE_UNIX98
 333 extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
 334      __THROW __nonnull ((1));
 335 extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
 336                            gethostname) __nonnull ((1));
 337 extern int __REDIRECT_NTH (__gethostname_chk_warn,
 338                            (char *__buf, size_t __buflen, size_t __nreal),
 339                            __gethostname_chk)
 340      __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
 341                                  "size of destination buffer");
 342
 343 __fortify_function int
 344 __NTH (gethostname (char *__buf, size_t __buflen))
 345 {
 346   if (__bos (__buf) != (size_t) -1)
 347     {
 348       if (!__builtin_constant_p (__buflen))
 349         return __gethostname_chk (__buf, __buflen, __bos (__buf));
 350
 351       if (__buflen > __bos (__buf))
 352         return __gethostname_chk_warn (__buf, __buflen, __bos (__buf));
 353     }
 354   return __gethostname_alias (__buf, __buflen);
 355 }
 356 #endif
 357
 358
 359 #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
 360 extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
 361      __THROW __nonnull ((1)) __wur;
 362 extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
 363                                                    size_t __buflen),
 364                            getdomainname) __nonnull ((1)) __wur;
 365 extern int __REDIRECT_NTH (__getdomainname_chk_warn,
 366                            (char *__buf, size_t __buflen, size_t __nreal),
 367                            __getdomainname_chk)
 368      __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
 369                                        "buflen than size of destination "
 370                                        "buffer");
 371
 372 __fortify_function int
 373 __NTH (getdomainname (char *__buf, size_t __buflen))
 374 {
 375   if (__bos (__buf) != (size_t) -1)
 376     {
 377       if (!__builtin_constant_p (__buflen))
 378         return __getdomainname_chk (__buf, __buflen, __bos (__buf));
 379
 380       if (__buflen > __bos (__buf))
 381         return __getdomainname_chk_warn (__buf, __buflen, __bos (__buf));
 382     }
 383   return __getdomainname_alias (__buf, __buflen);
 384 }
 385 #endif