1 : /* Checking macros for unistd functions.
2 : Copyright (C) 2005, 2006, 2007, 2008 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
35 : read (int __fd, void *__buf, size_t __nbytes)
36 : {
37 1062719 : if (__bos0 (__buf) != (size_t) -1)
38 : {
39 30574 : if (!__builtin_constant_p (__nbytes))
40 9787 : return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
41 :
42 20787 : if (__nbytes > __bos0 (__buf))
43 0 : return __read_chk_warn (__fd, __buf, __nbytes, __bos0 (__buf));
44 : }
45 1052932 : 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
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
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
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
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
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 *
201 : __NTH (getcwd (char *__buf, size_t __size))
202 : {
203 0 : if (__bos (__buf) != (size_t) -1)
204 : {
205 0 : if (!__builtin_constant_p (__size))
206 0 : return __getcwd_chk (__buf, __size, __bos (__buf));
207 :
208 0 : if (__size > __bos (__buf))
209 0 : return __getcwd_chk_warn (__buf, __size, __bos (__buf));
210 : }
211 0 : 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 *
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
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
266 : __NTH (getgroups (int __size, __gid_t __list[]))
267 : {
268 : if (__bos (__list) != (size_t) -1)
269 : {
270 : if (!__builtin_constant_p (__size) || __size < 0)
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
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
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
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
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
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