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 extern ssize_t __REDIRECT (__read_chk_warn,
29 (int __fd, void *__buf, size_t __nbytes,
30 size_t __buflen), __read_chk)
31 __wur __warnattr ("read called with bigger length than size of "
32 "the destination buffer");
33
34 __extern_always_inline __wur ssize_t
read(int __fd,void * __buf,size_t __nbytes)35 read (int __fd, void *__buf, size_t __nbytes)
36 {
37 if (__bos0 (__buf) != (size_t) -1)
38 {
39 if (!__builtin_constant_p (__nbytes))
40 return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
41
42 if (__nbytes > __bos0 (__buf))
43 return __read_chk_warn (__fd, __buf, __nbytes, __bos0 (__buf));
44 }
45 return __read_alias (__fd, __buf, __nbytes);
46 }
47
48 #ifdef __USE_UNIX98
49 extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
50 __off_t __offset, size_t __bufsize) __wur;
51 extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
52 __off64_t __offset, size_t __bufsize) __wur;
53 extern ssize_t __REDIRECT (__pread_alias,
54 (int __fd, void *__buf, size_t __nbytes,
55 __off_t __offset), pread) __wur;
56 extern ssize_t __REDIRECT (__pread64_alias,
57 (int __fd, void *__buf, size_t __nbytes,
58 __off64_t __offset), pread64) __wur;
59 extern ssize_t __REDIRECT (__pread_chk_warn,
60 (int __fd, void *__buf, size_t __nbytes,
61 __off_t __offset, size_t __bufsize), __pread_chk)
62 __wur __warnattr ("pread called with bigger length than size of "
63 "the destination buffer");
64 extern ssize_t __REDIRECT (__pread64_chk_warn,
65 (int __fd, void *__buf, size_t __nbytes,
66 __off64_t __offset, size_t __bufsize),
67 __pread64_chk)
68 __wur __warnattr ("pread64 called with bigger length than size of "
69 "the destination buffer");
70
71 # ifndef __USE_FILE_OFFSET64
72 __extern_always_inline __wur ssize_t
pread(int __fd,void * __buf,size_t __nbytes,__off_t __offset)73 pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
74 {
75 if (__bos0 (__buf) != (size_t) -1)
76 {
77 if (!__builtin_constant_p (__nbytes))
78 return __pread_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
79
80 if ( __nbytes > __bos0 (__buf))
81 return __pread_chk_warn (__fd, __buf, __nbytes, __offset,
82 __bos0 (__buf));
83 }
84 return __pread_alias (__fd, __buf, __nbytes, __offset);
85 }
86 # else
87 __extern_always_inline __wur ssize_t
pread(int __fd,void * __buf,size_t __nbytes,__off64_t __offset)88 pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
89 {
90 if (__bos0 (__buf) != (size_t) -1)
91 {
92 if (!__builtin_constant_p (__nbytes))
93 return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
94
95 if ( __nbytes > __bos0 (__buf))
96 return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
97 __bos0 (__buf));
98 }
99
100 return __pread64_alias (__fd, __buf, __nbytes, __offset);
101 }
102 # endif
103
104 # ifdef __USE_LARGEFILE64
105 __extern_always_inline __wur ssize_t
pread64(int __fd,void * __buf,size_t __nbytes,__off64_t __offset)106 pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
107 {
108 if (__bos0 (__buf) != (size_t) -1)
109 {
110 if (!__builtin_constant_p (__nbytes))
111 return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
112
113 if ( __nbytes > __bos0 (__buf))
114 return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
115 __bos0 (__buf));
116 }
117
118 return __pread64_alias (__fd, __buf, __nbytes, __offset);
119 }
120 # endif
121 #endif
122
123 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
124 extern ssize_t __readlink_chk (__const char *__restrict __path,
125 char *__restrict __buf, size_t __len,
126 size_t __buflen)
127 __THROW __nonnull ((1, 2)) __wur;
128 extern ssize_t __REDIRECT_NTH (__readlink_alias,
129 (__const char *__restrict __path,
130 char *__restrict __buf, size_t __len), readlink)
131 __nonnull ((1, 2)) __wur;
132 extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
133 (__const char *__restrict __path,
134 char *__restrict __buf, size_t __len,
135 size_t __buflen), __readlink_chk)
136 __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
137 "than size of destination buffer");
138
139 __extern_always_inline __nonnull ((1, 2)) __wur ssize_t
__NTH(readlink (__const char * __restrict __path,char * __restrict __buf,size_t __len))140 __NTH (readlink (__const char *__restrict __path, char *__restrict __buf,
141 size_t __len))
142 {
143 if (__bos (__buf) != (size_t) -1)
144 {
145 if (!__builtin_constant_p (__len))
146 return __readlink_chk (__path, __buf, __len, __bos (__buf));
147
148 if ( __len > __bos (__buf))
149 return __readlink_chk_warn (__path, __buf, __len, __bos (__buf));
150 }
151 return __readlink_alias (__path, __buf, __len);
152 }
153 #endif
154
155 #ifdef __USE_ATFILE
156 extern ssize_t __readlinkat_chk (int __fd, __const char *__restrict __path,
157 char *__restrict __buf, size_t __len,
158 size_t __buflen)
159 __THROW __nonnull ((2, 3)) __wur;
160 extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
161 (int __fd, __const char *__restrict __path,
162 char *__restrict __buf, size_t __len),
163 readlinkat)
164 __nonnull ((2, 3)) __wur;
165 extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
166 (int __fd, __const char *__restrict __path,
167 char *__restrict __buf, size_t __len,
168 size_t __buflen), __readlinkat_chk)
169 __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
170 "length than size of destination "
171 "buffer");
172
173 __extern_always_inline __nonnull ((2, 3)) __wur ssize_t
__NTH(readlinkat (int __fd,__const char * __restrict __path,char * __restrict __buf,size_t __len))174 __NTH (readlinkat (int __fd, __const char *__restrict __path,
175 char *__restrict __buf, size_t __len))
176 {
177 if (__bos (__buf) != (size_t) -1)
178 {
179 if (!__builtin_constant_p (__len))
180 return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
181
182 if (__len > __bos (__buf))
183 return __readlinkat_chk_warn (__fd, __path, __buf, __len,
184 __bos (__buf));
185 }
186 return __readlinkat_alias (__fd, __path, __buf, __len);
187 }
188 #endif
189
190 extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
191 __THROW __wur;
192 extern char *__REDIRECT_NTH (__getcwd_alias,
193 (char *__buf, size_t __size), getcwd) __wur;
194 extern char *__REDIRECT_NTH (__getcwd_chk_warn,
195 (char *__buf, size_t __size, size_t __buflen),
196 __getcwd_chk)
197 __wur __warnattr ("getcwd caller with bigger length than size of "
198 "destination buffer");
199
200 __extern_always_inline __wur char *
__NTH(getcwd (char * __buf,size_t __size))201 __NTH (getcwd (char *__buf, size_t __size))
202 {
203 if (__bos (__buf) != (size_t) -1)
204 {
205 if (!__builtin_constant_p (__size))
206 return __getcwd_chk (__buf, __size, __bos (__buf));
207
208 if (__size > __bos (__buf))
209 return __getcwd_chk_warn (__buf, __size, __bos (__buf));
210 }
211 return __getcwd_alias (__buf, __size);
212 }
213
214 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
215 extern char *__getwd_chk (char *__buf, size_t buflen)
216 __THROW __nonnull ((1)) __wur;
217 extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
218 __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
219 "doesn't specify buffer size");
220
221 __extern_always_inline __nonnull ((1)) __attribute_deprecated__ __wur char *
__NTH(getwd (char * __buf))222 __NTH (getwd (char *__buf))
223 {
224 if (__bos (__buf) != (size_t) -1)
225 return __getwd_chk (__buf, __bos (__buf));
226 return __getwd_warn (__buf);
227 }
228 #endif
229
230 extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
231 size_t __buflen) __THROW;
232 extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
233 size_t __len), confstr);
234 extern size_t __REDIRECT_NTH (__confstr_chk_warn,
235 (int __name, char *__buf, size_t __len,
236 size_t __buflen), __confstr_chk)
237 __warnattr ("confstr called with bigger length than size of destination "
238 "buffer");
239
240 __extern_always_inline size_t
__NTH(confstr (int __name,char * __buf,size_t __len))241 __NTH (confstr (int __name, char *__buf, size_t __len))
242 {
243 if (__bos (__buf) != (size_t) -1)
244 {
245 if (!__builtin_constant_p (__len))
246 return __confstr_chk (__name, __buf, __len, __bos (__buf));
247
248 if (__bos (__buf) < __len)
249 return __confstr_chk_warn (__name, __buf, __len, __bos (__buf));
250 }
251 return __confstr_alias (__name, __buf, __len);
252 }
253
254
255 extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
256 __THROW __wur;
257 extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
258 getgroups) __wur;
259 extern int __REDIRECT_NTH (__getgroups_chk_warn,
260 (int __size, __gid_t __list[], size_t __listlen),
261 __getgroups_chk)
262 __wur __warnattr ("getgroups called with bigger group count than what "
263 "can fit into destination buffer");
264
265 __extern_always_inline int
__NTH(getgroups (int __size,__gid_t __list[]))266 __NTH (getgroups (int __size, __gid_t __list[]))
267 {
268 if (__bos (__list) != (size_t) -1)
269 {
270 if (!__builtin_constant_p (__size))
271 return __getgroups_chk (__size, __list, __bos (__list));
272
273 if (__size * sizeof (__gid_t) > __bos (__list))
274 return __getgroups_chk_warn (__size, __list, __bos (__list));
275 }
276 return __getgroups_alias (__size, __list);
277 }
278
279
280 extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
281 size_t __nreal) __THROW __nonnull ((2));
282 extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
283 size_t __buflen), ttyname_r)
284 __nonnull ((2));
285 extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
286 (int __fd, char *__buf, size_t __buflen,
287 size_t __nreal), __ttyname_r_chk)
288 __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
289 "size of destination buffer");
290
291 __extern_always_inline int
__NTH(ttyname_r (int __fd,char * __buf,size_t __buflen))292 __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
293 {
294 if (__bos (__buf) != (size_t) -1)
295 {
296 if (!__builtin_constant_p (__buflen))
297 return __ttyname_r_chk (__fd, __buf, __buflen, __bos (__buf));
298
299 if (__buflen > __bos (__buf))
300 return __ttyname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
301 }
302 return __ttyname_r_alias (__fd, __buf, __buflen);
303 }
304
305
306 #if defined __USE_REENTRANT || defined __USE_POSIX199506
307 extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
308 __nonnull ((1));
309 extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
310 getlogin_r) __nonnull ((1));
311 extern int __REDIRECT (__getlogin_r_chk_warn,
312 (char *__buf, size_t __buflen, size_t __nreal),
313 __getlogin_r_chk)
314 __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
315 "size of destination buffer");
316
317 __extern_always_inline int
getlogin_r(char * __buf,size_t __buflen)318 getlogin_r (char *__buf, size_t __buflen)
319 {
320 if (__bos (__buf) != (size_t) -1)
321 {
322 if (!__builtin_constant_p (__buflen))
323 return __getlogin_r_chk (__buf, __buflen, __bos (__buf));
324
325 if (__buflen > __bos (__buf))
326 return __getlogin_r_chk_warn (__buf, __buflen, __bos (__buf));
327 }
328 return __getlogin_r_alias (__buf, __buflen);
329 }
330 #endif
331
332
333 #if defined __USE_BSD || defined __USE_UNIX98
334 extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
335 __THROW __nonnull ((1));
336 extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
337 gethostname) __nonnull ((1));
338 extern int __REDIRECT_NTH (__gethostname_chk_warn,
339 (char *__buf, size_t __buflen, size_t __nreal),
340 __gethostname_chk)
341 __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
342 "size of destination buffer");
343
344 __extern_always_inline int
__NTH(gethostname (char * __buf,size_t __buflen))345 __NTH (gethostname (char *__buf, size_t __buflen))
346 {
347 if (__bos (__buf) != (size_t) -1)
348 {
349 if (!__builtin_constant_p (__buflen))
350 return __gethostname_chk (__buf, __buflen, __bos (__buf));
351
352 if (__buflen > __bos (__buf))
353 return __gethostname_chk_warn (__buf, __buflen, __bos (__buf));
354 }
355 return __gethostname_alias (__buf, __buflen);
356 }
357 #endif
358
359
360 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
361 extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
362 __THROW __nonnull ((1)) __wur;
363 extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
364 size_t __buflen),
365 getdomainname) __nonnull ((1)) __wur;
366 extern int __REDIRECT_NTH (__getdomainname_chk_warn,
367 (char *__buf, size_t __buflen, size_t __nreal),
368 __getdomainname_chk)
369 __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
370 "buflen than size of destination "
371 "buffer");
372
373 __extern_always_inline int
__NTH(getdomainname (char * __buf,size_t __buflen))374 __NTH (getdomainname (char *__buf, size_t __buflen))
375 {
376 if (__bos (__buf) != (size_t) -1)
377 {
378 if (!__builtin_constant_p (__buflen))
379 return __getdomainname_chk (__buf, __buflen, __bos (__buf));
380
381 if (__buflen > __bos (__buf))
382 return __getdomainname_chk_warn (__buf, __buflen, __bos (__buf));
383 }
384 return __getdomainname_alias (__buf, __buflen);
385 }
386 #endif
387