1/* Checking macros for unistd functions.
2 Copyright (C) 2005-2022 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 <https://www.gnu.org/licenses/>. */
18
19#ifndef _UNISTD_H
20# error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
21#endif
22
23extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
24 size_t __buflen)
25 __wur __attr_access ((__write_only__, 2, 3));
26extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
27 size_t __nbytes), read)
28 __wur __attr_access ((__write_only__, 2, 3));
29extern ssize_t __REDIRECT (__read_chk_warn,
30 (int __fd, void *__buf, size_t __nbytes,
31 size_t __buflen), __read_chk)
32 __wur __warnattr ("read called with bigger length than size of "
33 "the destination buffer");
34
35__fortify_function __wur ssize_t
36read (int __fd, void *__buf, size_t __nbytes)
37{
38 return __glibc_fortify (read, __nbytes, sizeof (char),
39 __glibc_objsize0 (__buf),
40 __fd, __buf, __nbytes);
41}
42
43#if defined __USE_UNIX98 || defined __USE_XOPEN2K8
44extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
45 __off_t __offset, size_t __bufsize)
46 __wur __attr_access ((__write_only__, 2, 3));
47extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
48 __off64_t __offset, size_t __bufsize)
49 __wur __attr_access ((__write_only__, 2, 3));
50extern ssize_t __REDIRECT (__pread_alias,
51 (int __fd, void *__buf, size_t __nbytes,
52 __off_t __offset), pread)
53 __wur __attr_access ((__write_only__, 2, 3));
54extern ssize_t __REDIRECT (__pread64_alias,
55 (int __fd, void *__buf, size_t __nbytes,
56 __off64_t __offset), pread64)
57 __wur __attr_access ((__write_only__, 2, 3));
58extern 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");
63extern 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
72pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
73{
74 return __glibc_fortify (pread, __nbytes, sizeof (char),
75 __glibc_objsize0 (__buf),
76 __fd, __buf, __nbytes, __offset);
77}
78# else
79__fortify_function __wur ssize_t
80pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
81{
82 return __glibc_fortify (pread64, __nbytes, sizeof (char),
83 __glibc_objsize0 (__buf),
84 __fd, __buf, __nbytes, __offset);
85}
86# endif
87
88# ifdef __USE_LARGEFILE64
89__fortify_function __wur ssize_t
90pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
91{
92 return __glibc_fortify (pread64, __nbytes, sizeof (char),
93 __glibc_objsize0 (__buf),
94 __fd, __buf, __nbytes, __offset);
95}
96# endif
97#endif
98
99#if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
100extern ssize_t __readlink_chk (const char *__restrict __path,
101 char *__restrict __buf, size_t __len,
102 size_t __buflen)
103 __THROW __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
104extern ssize_t __REDIRECT_NTH (__readlink_alias,
105 (const char *__restrict __path,
106 char *__restrict __buf, size_t __len), readlink)
107 __nonnull ((1, 2)) __wur __attr_access ((__write_only__, 2, 3));
108extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
109 (const char *__restrict __path,
110 char *__restrict __buf, size_t __len,
111 size_t __buflen), __readlink_chk)
112 __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
113 "than size of destination buffer");
114
115__fortify_function __nonnull ((1, 2)) __wur ssize_t
116__NTH (readlink (const char *__restrict __path, char *__restrict __buf,
117 size_t __len))
118{
119 return __glibc_fortify (readlink, __len, sizeof (char),
120 __glibc_objsize (__buf),
121 __path, __buf, __len);
122}
123#endif
124
125#ifdef __USE_ATFILE
126extern ssize_t __readlinkat_chk (int __fd, const char *__restrict __path,
127 char *__restrict __buf, size_t __len,
128 size_t __buflen)
129 __THROW __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
130extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
131 (int __fd, const char *__restrict __path,
132 char *__restrict __buf, size_t __len),
133 readlinkat)
134 __nonnull ((2, 3)) __wur __attr_access ((__write_only__, 3, 4));
135extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
136 (int __fd, const char *__restrict __path,
137 char *__restrict __buf, size_t __len,
138 size_t __buflen), __readlinkat_chk)
139 __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
140 "length than size of destination "
141 "buffer");
142
143__fortify_function __nonnull ((2, 3)) __wur ssize_t
144__NTH (readlinkat (int __fd, const char *__restrict __path,
145 char *__restrict __buf, size_t __len))
146{
147 return __glibc_fortify (readlinkat, __len, sizeof (char),
148 __glibc_objsize (__buf),
149 __fd, __path, __buf, __len);
150}
151#endif
152
153extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
154 __THROW __wur;
155extern char *__REDIRECT_NTH (__getcwd_alias,
156 (char *__buf, size_t __size), getcwd) __wur;
157extern char *__REDIRECT_NTH (__getcwd_chk_warn,
158 (char *__buf, size_t __size, size_t __buflen),
159 __getcwd_chk)
160 __wur __warnattr ("getcwd caller with bigger length than size of "
161 "destination buffer");
162
163__fortify_function __wur char *
164__NTH (getcwd (char *__buf, size_t __size))
165{
166 return __glibc_fortify (getcwd, __size, sizeof (char),
167 __glibc_objsize (__buf),
168 __buf, __size);
169}
170
171#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
172extern char *__getwd_chk (char *__buf, size_t buflen)
173 __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
174extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
175 __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
176 "doesn't specify buffer size");
177
178__fortify_function __nonnull ((1)) __attribute_deprecated__ __wur char *
179__NTH (getwd (char *__buf))
180{
181 if (__glibc_objsize (__buf) != (size_t) -1)
182 return __getwd_chk (__buf, __glibc_objsize (__buf));
183 return __getwd_warn (__buf);
184}
185#endif
186
187extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
188 size_t __buflen) __THROW
189 __attr_access ((__write_only__, 2, 3));
190extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
191 size_t __len), confstr)
192 __attr_access ((__write_only__, 2, 3));
193extern size_t __REDIRECT_NTH (__confstr_chk_warn,
194 (int __name, char *__buf, size_t __len,
195 size_t __buflen), __confstr_chk)
196 __warnattr ("confstr called with bigger length than size of destination "
197 "buffer");
198
199__fortify_function size_t
200__NTH (confstr (int __name, char *__buf, size_t __len))
201{
202 return __glibc_fortify (confstr, __len, sizeof (char),
203 __glibc_objsize (__buf),
204 __name, __buf, __len);
205}
206
207
208extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
209 __THROW __wur __attr_access ((__write_only__, 2, 1));
210extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
211 getgroups) __wur __attr_access ((__write_only__, 2, 1));
212extern int __REDIRECT_NTH (__getgroups_chk_warn,
213 (int __size, __gid_t __list[], size_t __listlen),
214 __getgroups_chk)
215 __wur __warnattr ("getgroups called with bigger group count than what "
216 "can fit into destination buffer");
217
218__fortify_function int
219__NTH (getgroups (int __size, __gid_t __list[]))
220{
221 return __glibc_fortify (getgroups, __size, sizeof (__gid_t),
222 __glibc_objsize (__list),
223 __size, __list);
224}
225
226
227extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
228 size_t __nreal) __THROW __nonnull ((2))
229 __attr_access ((__write_only__, 2, 3));
230extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
231 size_t __buflen), ttyname_r)
232 __nonnull ((2));
233extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
234 (int __fd, char *__buf, size_t __buflen,
235 size_t __nreal), __ttyname_r_chk)
236 __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
237 "size of destination buffer");
238
239__fortify_function int
240__NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
241{
242 return __glibc_fortify (ttyname_r, __buflen, sizeof (char),
243 __glibc_objsize (__buf),
244 __fd, __buf, __buflen);
245}
246
247
248#ifdef __USE_POSIX199506
249extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
250 __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
251extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
252 getlogin_r) __nonnull ((1));
253extern int __REDIRECT (__getlogin_r_chk_warn,
254 (char *__buf, size_t __buflen, size_t __nreal),
255 __getlogin_r_chk)
256 __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
257 "size of destination buffer");
258
259__fortify_function int
260getlogin_r (char *__buf, size_t __buflen)
261{
262 return __glibc_fortify (getlogin_r, __buflen, sizeof (char),
263 __glibc_objsize (__buf),
264 __buf, __buflen);
265}
266#endif
267
268
269#if defined __USE_MISC || defined __USE_UNIX98
270extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
271 __THROW __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
272extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
273 gethostname)
274 __nonnull ((1)) __attr_access ((__write_only__, 1, 2));
275extern int __REDIRECT_NTH (__gethostname_chk_warn,
276 (char *__buf, size_t __buflen, size_t __nreal),
277 __gethostname_chk)
278 __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
279 "size of destination buffer");
280
281__fortify_function int
282__NTH (gethostname (char *__buf, size_t __buflen))
283{
284 return __glibc_fortify (gethostname, __buflen, sizeof (char),
285 __glibc_objsize (__buf),
286 __buf, __buflen);
287}
288#endif
289
290
291#if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
292extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
293 __THROW __nonnull ((1)) __wur __attr_access ((__write_only__, 1, 2));
294extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
295 size_t __buflen),
296 getdomainname) __nonnull ((1))
297 __wur __attr_access ((__write_only__, 1, 2));
298extern int __REDIRECT_NTH (__getdomainname_chk_warn,
299 (char *__buf, size_t __buflen, size_t __nreal),
300 __getdomainname_chk)
301 __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
302 "buflen than size of destination "
303 "buffer");
304
305__fortify_function int
306__NTH (getdomainname (char *__buf, size_t __buflen))
307{
308 return __glibc_fortify (getdomainname, __buflen, sizeof (char),
309 __glibc_objsize (__buf),
310 __buf, __buflen);
311}
312#endif
313