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b168057a | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
40a55d20 UD |
3 | Written by Per Bothner <bothner@cygnus.com>. |
4 | ||
41bdb6e2 AJ |
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. | |
40a55d20 | 9 | |
41bdb6e2 AJ |
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 | |
40a55d20 | 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 13 | Lesser General Public License for more details. |
40a55d20 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. | |
40a55d20 | 18 | |
41bdb6e2 AJ |
19 | As a special exception, if you link the code in this file with |
20 | files compiled with a GNU compiler to produce an executable, | |
21 | that does not cause the resulting executable to be covered by | |
22 | the GNU Lesser General Public License. This exception does not | |
23 | however invalidate any other reasons why the executable file | |
24 | might be covered by the GNU Lesser General Public License. | |
25 | This exception applies to code released by its copyright holders | |
26 | in files containing the exception. */ | |
196980f5 | 27 | |
fa0bc87c RM |
28 | #ifndef _POSIX_SOURCE |
29 | # define _POSIX_SOURCE | |
30 | #endif | |
196980f5 | 31 | #include "libioP.h" |
8ae4bb5a | 32 | #include <fcntl.h> |
196980f5 RM |
33 | #include <signal.h> |
34 | #include <unistd.h> | |
196980f5 | 35 | #include <stdlib.h> |
fa0bc87c | 36 | #ifdef _LIBC |
fd091d3f | 37 | # include <shlib-compat.h> |
73299943 | 38 | # include <not-cancel.h> |
fa0bc87c | 39 | #endif |
196980f5 RM |
40 | #include <sys/types.h> |
41 | #include <sys/wait.h> | |
e038616f | 42 | #include <kernel-features.h> |
196980f5 RM |
43 | |
44 | #ifndef _IO_fork | |
50304ef0 | 45 | #ifdef _LIBC |
64d2a379 | 46 | #define _IO_fork __fork |
50304ef0 | 47 | #else |
64d2a379 | 48 | #define _IO_fork fork /* defined in libiberty, if needed */ |
50304ef0 | 49 | #endif |
79937577 | 50 | extern _IO_pid_t _IO_fork (void) __THROW; |
196980f5 RM |
51 | #endif |
52 | ||
196980f5 | 53 | #ifndef _IO_dup2 |
50304ef0 UD |
54 | #ifdef _LIBC |
55 | #define _IO_dup2 __dup2 | |
56 | #else | |
196980f5 | 57 | #define _IO_dup2 dup2 |
50304ef0 | 58 | #endif |
79937577 | 59 | extern int _IO_dup2 (int fd, int fd2) __THROW; |
196980f5 RM |
60 | #endif |
61 | ||
62 | #ifndef _IO_waitpid | |
50304ef0 | 63 | #ifdef _LIBC |
73299943 | 64 | #define _IO_waitpid waitpid_not_cancel |
50304ef0 | 65 | #else |
196980f5 RM |
66 | #define _IO_waitpid waitpid |
67 | #endif | |
50304ef0 | 68 | #endif |
196980f5 RM |
69 | |
70 | #ifndef _IO_execl | |
71 | #define _IO_execl execl | |
72 | #endif | |
73 | #ifndef _IO__exit | |
74 | #define _IO__exit _exit | |
75 | #endif | |
76 | ||
61eb22d3 | 77 | #ifndef _IO_close |
50304ef0 | 78 | #ifdef _LIBC |
73299943 | 79 | #define _IO_close close_not_cancel |
50304ef0 | 80 | #else |
61eb22d3 UD |
81 | #define _IO_close close |
82 | #endif | |
50304ef0 | 83 | #endif |
61eb22d3 | 84 | |
196980f5 RM |
85 | struct _IO_proc_file |
86 | { | |
bd355af0 | 87 | struct _IO_FILE_plus file; |
196980f5 RM |
88 | /* Following fields must match those in class procbuf (procbuf.h) */ |
89 | _IO_pid_t pid; | |
90 | struct _IO_proc_file *next; | |
91 | }; | |
92 | typedef struct _IO_proc_file _IO_proc_file; | |
93 | ||
b2637a22 | 94 | static const struct _IO_jump_t _IO_proc_jumps; |
d64b6ad0 | 95 | |
390500b1 | 96 | static struct _IO_proc_file *proc_file_chain; |
196980f5 | 97 | |
34183f57 UD |
98 | #ifdef _IO_MTSAFE_IO |
99 | static _IO_lock_t proc_file_chain_lock = _IO_lock_initializer; | |
100 | ||
101 | static void | |
102 | unlock (void *not_used) | |
103 | { | |
104 | _IO_lock_unlock (proc_file_chain_lock); | |
105 | } | |
106 | #endif | |
107 | ||
196980f5 | 108 | _IO_FILE * |
9d46370c | 109 | _IO_new_proc_open (_IO_FILE *fp, const char *command, const char *mode) |
196980f5 | 110 | { |
372aece0 UD |
111 | int read_or_write; |
112 | int parent_end, child_end; | |
196980f5 | 113 | int pipe_fds[2]; |
196980f5 | 114 | _IO_pid_t child_pid; |
d6e0c2a6 UD |
115 | |
116 | int do_read = 0; | |
117 | int do_write = 0; | |
118 | int do_cloexec = 0; | |
119 | while (*mode != '\0') | |
120 | switch (*mode++) | |
121 | { | |
122 | case 'r': | |
123 | do_read = 1; | |
124 | break; | |
125 | case 'w': | |
126 | do_write = 1; | |
127 | break; | |
128 | case 'e': | |
129 | do_cloexec = 1; | |
130 | break; | |
131 | default: | |
132 | errout: | |
133 | __set_errno (EINVAL); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | if ((do_read ^ do_write) == 0) | |
138 | goto errout; | |
139 | ||
40a55d20 | 140 | if (_IO_file_is_open (fp)) |
196980f5 | 141 | return NULL; |
d6e0c2a6 UD |
142 | |
143 | #ifdef O_CLOEXEC | |
144 | # ifndef __ASSUME_PIPE2 | |
145 | if (__have_pipe2 >= 0) | |
146 | # endif | |
147 | { | |
148 | int r = __pipe2 (pipe_fds, O_CLOEXEC); | |
149 | # ifndef __ASSUME_PIPE2 | |
150 | if (__have_pipe2 == 0) | |
151 | __have_pipe2 = r != -1 || errno != ENOSYS ? 1 : -1; | |
152 | ||
153 | if (__have_pipe2 > 0) | |
154 | # endif | |
155 | if (r < 0) | |
156 | return NULL; | |
157 | } | |
158 | #endif | |
159 | #ifndef __ASSUME_PIPE2 | |
160 | # ifdef O_CLOEXEC | |
161 | if (__have_pipe2 < 0) | |
162 | # endif | |
163 | if (__pipe (pipe_fds) < 0) | |
164 | return NULL; | |
165 | #endif | |
166 | ||
167 | if (do_read) | |
196980f5 RM |
168 | { |
169 | parent_end = pipe_fds[0]; | |
170 | child_end = pipe_fds[1]; | |
171 | read_or_write = _IO_NO_WRITES; | |
172 | } | |
d6e0c2a6 | 173 | else |
196980f5 RM |
174 | { |
175 | parent_end = pipe_fds[1]; | |
176 | child_end = pipe_fds[0]; | |
177 | read_or_write = _IO_NO_READS; | |
178 | } | |
d6e0c2a6 | 179 | |
40a55d20 | 180 | ((_IO_proc_file *) fp)->pid = child_pid = _IO_fork (); |
196980f5 RM |
181 | if (child_pid == 0) |
182 | { | |
d6e0c2a6 | 183 | int child_std_end = do_read ? 1 : 0; |
3c493630 AS |
184 | struct _IO_proc_file *p; |
185 | ||
d6e0c2a6 UD |
186 | #ifndef __ASSUME_PIPE2 |
187 | /* If we have pipe2 the descriptor is marked for close-on-exec. */ | |
40a55d20 | 188 | _IO_close (parent_end); |
d6e0c2a6 | 189 | #endif |
196980f5 RM |
190 | if (child_end != child_std_end) |
191 | { | |
40a55d20 | 192 | _IO_dup2 (child_end, child_std_end); |
d6e0c2a6 | 193 | #ifndef __ASSUME_PIPE2 |
40a55d20 | 194 | _IO_close (child_end); |
d6e0c2a6 UD |
195 | #endif |
196 | } | |
197 | #ifdef O_CLOEXEC | |
198 | else | |
199 | { | |
200 | /* The descriptor is already the one we will use. But it must | |
201 | not be marked close-on-exec. Undo the effects. */ | |
202 | # ifndef __ASSUME_PIPE2 | |
203 | if (__have_pipe2 > 0) | |
204 | # endif | |
205 | __fcntl (child_end, F_SETFD, 0); | |
196980f5 | 206 | } |
d6e0c2a6 | 207 | #endif |
40a55d20 | 208 | /* POSIX.2: "popen() shall ensure that any streams from previous |
196980f5 RM |
209 | popen() calls that remain open in the parent process are closed |
210 | in the new child process." */ | |
3c493630 | 211 | for (p = proc_file_chain; p; p = p->next) |
d8d7feef UD |
212 | { |
213 | int fd = _IO_fileno ((_IO_FILE *) p); | |
214 | ||
215 | /* If any stream from previous popen() calls has fileno | |
216 | child_std_end, it has been already closed by the dup2 syscall | |
217 | above. */ | |
218 | if (fd != child_std_end) | |
219 | _IO_close (fd); | |
220 | } | |
196980f5 | 221 | |
40a55d20 UD |
222 | _IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0); |
223 | _IO__exit (127); | |
196980f5 | 224 | } |
40a55d20 | 225 | _IO_close (child_end); |
196980f5 RM |
226 | if (child_pid < 0) |
227 | { | |
40a55d20 | 228 | _IO_close (parent_end); |
196980f5 RM |
229 | return NULL; |
230 | } | |
d6e0c2a6 UD |
231 | |
232 | if (do_cloexec) | |
233 | { | |
234 | #ifndef __ASSUME_PIPE2 | |
235 | # ifdef O_CLOEXEC | |
236 | if (__have_pipe2 < 0) | |
237 | # endif | |
238 | __fcntl (parent_end, F_SETFD, FD_CLOEXEC); | |
239 | #endif | |
240 | } | |
241 | else | |
242 | { | |
243 | #ifdef O_CLOEXEC | |
244 | /* Undo the effects of the pipe2 call which set the | |
245 | close-on-exec flag. */ | |
246 | # ifndef __ASSUME_PIPE2 | |
247 | if (__have_pipe2 > 0) | |
248 | # endif | |
249 | __fcntl (parent_end, F_SETFD, 0); | |
250 | #endif | |
251 | } | |
252 | ||
40a55d20 | 253 | _IO_fileno (fp) = parent_end; |
196980f5 RM |
254 | |
255 | /* Link into proc_file_chain. */ | |
9ec9864b | 256 | #ifdef _IO_MTSAFE_IO |
34183f57 UD |
257 | _IO_cleanup_region_start_noarg (unlock); |
258 | _IO_lock_lock (proc_file_chain_lock); | |
259 | #endif | |
40a55d20 UD |
260 | ((_IO_proc_file *) fp)->next = proc_file_chain; |
261 | proc_file_chain = (_IO_proc_file *) fp; | |
9ec9864b | 262 | #ifdef _IO_MTSAFE_IO |
34183f57 UD |
263 | _IO_lock_unlock (proc_file_chain_lock); |
264 | _IO_cleanup_region_end (0); | |
265 | #endif | |
196980f5 RM |
266 | |
267 | _IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES); | |
268 | return fp; | |
196980f5 RM |
269 | } |
270 | ||
271 | _IO_FILE * | |
9d46370c | 272 | _IO_new_popen (const char *command, const char *mode) |
196980f5 | 273 | { |
edf5b2d7 UD |
274 | struct locked_FILE |
275 | { | |
276 | struct _IO_proc_file fpx; | |
499e7464 | 277 | #ifdef _IO_MTSAFE_IO |
edf5b2d7 | 278 | _IO_lock_t lock; |
499e7464 | 279 | #endif |
edf5b2d7 UD |
280 | } *new_f; |
281 | _IO_FILE *fp; | |
282 | ||
283 | new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); | |
284 | if (new_f == NULL) | |
196980f5 | 285 | return NULL; |
499e7464 | 286 | #ifdef _IO_MTSAFE_IO |
bd355af0 | 287 | new_f->fpx.file.file._lock = &new_f->lock; |
499e7464 | 288 | #endif |
7ce241a0 | 289 | fp = &new_f->fpx.file.file; |
d18ea0c5 | 290 | _IO_init (fp, 0); |
2ca8b1ee GM |
291 | _IO_JUMPS (&new_f->fpx.file) = &_IO_proc_jumps; |
292 | _IO_new_file_init (&new_f->fpx.file); | |
196980f5 | 293 | #if !_IO_UNIFIED_JUMPTABLES |
7ce241a0 | 294 | new_f->fpx.file.vtable = NULL; |
196980f5 | 295 | #endif |
7d6a8338 | 296 | if (_IO_new_proc_open (fp, command, mode) != NULL) |
2ca8b1ee | 297 | return (_IO_FILE *) &new_f->fpx.file; |
d18ea0c5 | 298 | _IO_un_link (&new_f->fpx.file); |
edf5b2d7 | 299 | free (new_f); |
196980f5 RM |
300 | return NULL; |
301 | } | |
302 | ||
196980f5 | 303 | int |
9d46370c | 304 | _IO_new_proc_close (_IO_FILE *fp) |
196980f5 RM |
305 | { |
306 | /* This is not name-space clean. FIXME! */ | |
196980f5 RM |
307 | int wstatus; |
308 | _IO_proc_file **ptr = &proc_file_chain; | |
309 | _IO_pid_t wait_pid; | |
310 | int status = -1; | |
311 | ||
312 | /* Unlink from proc_file_chain. */ | |
9ec9864b | 313 | #ifdef _IO_MTSAFE_IO |
34183f57 UD |
314 | _IO_cleanup_region_start_noarg (unlock); |
315 | _IO_lock_lock (proc_file_chain_lock); | |
316 | #endif | |
196980f5 RM |
317 | for ( ; *ptr != NULL; ptr = &(*ptr)->next) |
318 | { | |
40a55d20 | 319 | if (*ptr == (_IO_proc_file *) fp) |
196980f5 RM |
320 | { |
321 | *ptr = (*ptr)->next; | |
322 | status = 0; | |
323 | break; | |
324 | } | |
325 | } | |
9ec9864b | 326 | #ifdef _IO_MTSAFE_IO |
34183f57 UD |
327 | _IO_lock_unlock (proc_file_chain_lock); |
328 | _IO_cleanup_region_end (0); | |
329 | #endif | |
196980f5 | 330 | |
40a55d20 | 331 | if (status < 0 || _IO_close (_IO_fileno(fp)) < 0) |
196980f5 RM |
332 | return -1; |
333 | /* POSIX.2 Rationale: "Some historical implementations either block | |
334 | or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting | |
335 | for the child process to terminate. Since this behavior is not | |
336 | described in POSIX.2, such implementations are not conforming." */ | |
337 | do | |
338 | { | |
40a55d20 UD |
339 | wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0); |
340 | } | |
341 | while (wait_pid == -1 && errno == EINTR); | |
196980f5 RM |
342 | if (wait_pid == -1) |
343 | return -1; | |
344 | return wstatus; | |
196980f5 RM |
345 | } |
346 | ||
b2637a22 | 347 | static const struct _IO_jump_t _IO_proc_jumps = { |
196980f5 | 348 | JUMP_INIT_DUMMY, |
7d6a8338 UD |
349 | JUMP_INIT(finish, _IO_new_file_finish), |
350 | JUMP_INIT(overflow, _IO_new_file_overflow), | |
351 | JUMP_INIT(underflow, _IO_new_file_underflow), | |
d18ea0c5 AS |
352 | JUMP_INIT(uflow, _IO_default_uflow), |
353 | JUMP_INIT(pbackfail, _IO_default_pbackfail), | |
d64b6ad0 | 354 | JUMP_INIT(xsputn, _IO_new_file_xsputn), |
d18ea0c5 | 355 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
d64b6ad0 | 356 | JUMP_INIT(seekoff, _IO_new_file_seekoff), |
196980f5 | 357 | JUMP_INIT(seekpos, _IO_default_seekpos), |
7d6a8338 UD |
358 | JUMP_INIT(setbuf, _IO_new_file_setbuf), |
359 | JUMP_INIT(sync, _IO_new_file_sync), | |
d18ea0c5 AS |
360 | JUMP_INIT(doallocate, _IO_file_doallocate), |
361 | JUMP_INIT(read, _IO_file_read), | |
7d6a8338 | 362 | JUMP_INIT(write, _IO_new_file_write), |
d18ea0c5 | 363 | JUMP_INIT(seek, _IO_file_seek), |
7d6a8338 | 364 | JUMP_INIT(close, _IO_new_proc_close), |
d18ea0c5 | 365 | JUMP_INIT(stat, _IO_file_stat), |
dfd2257a UD |
366 | JUMP_INIT(showmanyc, _IO_default_showmanyc), |
367 | JUMP_INIT(imbue, _IO_default_imbue) | |
196980f5 | 368 | }; |
7d6a8338 | 369 | |
7d6a8338 | 370 | strong_alias (_IO_new_popen, __new_popen) |
fd091d3f UD |
371 | versioned_symbol (libc, _IO_new_popen, _IO_popen, GLIBC_2_1); |
372 | versioned_symbol (libc, __new_popen, popen, GLIBC_2_1); | |
373 | versioned_symbol (libc, _IO_new_proc_open, _IO_proc_open, GLIBC_2_1); | |
374 | versioned_symbol (libc, _IO_new_proc_close, _IO_proc_close, GLIBC_2_1); |