2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)popen.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/mail/popen.c,v 1.2.6.3 2003/01/06 05:46:03 mikeh Exp $
35 * $DragonFly: src/usr.bin/mail/popen.c,v 1.4 2004/09/08 05:01:11 joerg Exp $
52 static struct fp
*fp_head
;
61 static struct child
*child
;
62 static struct child
*findchild(int);
63 static void delchild(struct child
*);
64 static int file_pid(FILE *);
67 Fopen(const char *path
, const char *mode
)
71 if ((fp
= fopen(path
, mode
)) != NULL
) {
72 register_file(fp
, 0, 0);
73 fcntl(fileno(fp
), F_SETFD
, 1);
79 Fdopen(int fd
, const char *mode
)
83 if ((fp
= fdopen(fd
, mode
)) != NULL
) {
84 register_file(fp
, 0, 0);
85 fcntl(fileno(fp
), F_SETFD
, 1);
98 Popen(char *cmd
, const char *mode
)
101 int myside
, hisside
, fd0
, fd1
;
108 fcntl(p
[READ
], F_SETFD
, 1);
109 fcntl(p
[WRITE
], F_SETFD
, 1);
113 hisside
= fd1
= p
[WRITE
];
116 hisside
= fd0
= p
[READ
];
120 if ((pid
= start_command(cmd
, &nset
, fd0
, fd1
, NULL
, NULL
, NULL
)) < 0) {
126 if ((fp
= fdopen(myside
, mode
)) != NULL
)
127 register_file(fp
, 1, pid
);
138 unregister_file(ptr
);
141 sigaddset(&nset
, SIGINT
);
142 sigaddset(&nset
, SIGHUP
);
143 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
145 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
150 close_all_files(void)
153 while (fp_head
!= NULL
)
155 (void)Pclose(fp_head
->fp
);
157 (void)Fclose(fp_head
->fp
);
161 register_file(FILE *fp
, int pipe
, int pid
)
165 if ((fpp
= malloc(sizeof(*fpp
))) == NULL
)
166 err(1, "Out of memory");
175 unregister_file(FILE *fp
)
179 for (pp
= &fp_head
; (p
= *pp
) != NULL
; pp
= &p
->link
)
185 errx(1, "Invalid file pointer");
194 for (p
= fp_head
; p
!= NULL
; p
= p
->link
)
197 errx(1, "Invalid file pointer");
202 * Run a command without a shell, with optional arguments and splicing
203 * of stdin and stdout. The command name can be a sequence of words.
204 * Signals must be handled by the caller.
205 * "Mask" contains the signals to ignore in the new process.
206 * SIGINT is enabled unless it's in the mask.
210 run_command(char *cmd
, sigset_t
*mask
, int infd
, int outfd
, char *a0
, char *a1
,
215 if ((pid
= start_command(cmd
, mask
, infd
, outfd
, a0
, a1
, a2
)) < 0)
217 return (wait_command(pid
));
222 start_command(char *cmd
, sigset_t
*mask
, int infd
, int outfd
, char *a0
,
227 if ((pid
= fork()) < 0) {
233 int i
= getrawlist(cmd
, argv
, sizeof(argv
) / sizeof(*argv
));
235 if ((argv
[i
++] = a0
) != NULL
&&
236 (argv
[i
++] = a1
) != NULL
&&
237 (argv
[i
++] = a2
) != NULL
)
239 prepare_child(mask
, infd
, outfd
);
240 execvp(argv
[0], argv
);
248 prepare_child(sigset_t
*nset
, int infd
, int outfd
)
254 * All file descriptors other than 0, 1, and 2 are supposed to be
261 for (i
= 1; i
< NSIG
; i
++)
262 if (nset
!= NULL
&& sigismember(nset
, i
))
263 (void)signal(i
, SIG_IGN
);
264 if (nset
== NULL
|| !sigismember(nset
, SIGINT
))
265 (void)signal(SIGINT
, SIG_DFL
);
267 sigprocmask(SIG_SETMASK
, &eset
, NULL
);
271 wait_command(int pid
)
273 if (wait_child(pid
) < 0) {
274 printf("Fatal error in process.\n");
280 static struct child
*
285 for (cpp
= &child
; *cpp
!= NULL
&& (*cpp
)->pid
!= pid
;
289 *cpp
= malloc(sizeof(struct child
));
291 err(1, "Out of memory");
293 (*cpp
)->done
= (*cpp
)->free
= 0;
300 delchild(struct child
*cp
)
304 for (cpp
= &child
; *cpp
!= cp
; cpp
= &(*cpp
)->link
)
318 while ((pid
= waitpid((pid_t
)-1, &status
, WNOHANG
)) > 0) {
332 * Wait for a specific child to die.
338 struct child
*cp
= findchild(pid
);
341 sigaddset(&nset
, SIGCHLD
);
342 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
345 (void)sigsuspend(&oset
);
346 wait_status
= cp
->status
;
348 sigprocmask(SIG_SETMASK
, &oset
, NULL
);
349 return ((WIFEXITED(wait_status
) && WEXITSTATUS(wait_status
)) ? -1 : 0);
353 * Mark a child as don't care.
359 struct child
*cp
= findchild(pid
);
362 sigaddset(&nset
, SIGCHLD
);
363 sigprocmask(SIG_BLOCK
, &nset
, &oset
);
369 sigprocmask(SIG_SETMASK
, &oset
, NULL
);