2 * Copyright (c) 2007 Joerg Sonnenberger
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include "archive_platform.h"
28 /* This capability is only available on POSIX systems. */
29 #if defined(HAVE_PIPE) && defined(HAVE_FCNTL) && \
30 (defined(HAVE_FORK) || defined(HAVE_VFORK))
32 __FBSDID("$FreeBSD$");
34 #if defined(HAVE_POLL) && (defined(HAVE_POLL_H) || defined(HAVE_SYS_POLL_H))
35 # if defined(HAVE_POLL_H)
37 # elif defined(HAVE_SYS_POLL_H)
38 # include <sys/poll.h>
40 #elif defined(HAVE_SELECT)
41 # if defined(HAVE_SYS_SELECT_H)
42 # include <sys/select.h>
43 # elif defined(HAVE_UNISTD_H)
54 #include "filter_fork.h"
57 __archive_create_child(const char *path, int *child_stdin, int *child_stdout)
60 int stdin_pipe[2], stdout_pipe[2], tmp;
62 if (pipe(stdin_pipe) == -1)
64 if (stdin_pipe[0] == 1 /* stdout */) {
65 if ((tmp = dup(stdin_pipe[0])) == -1)
70 if (pipe(stdout_pipe) == -1)
72 if (stdout_pipe[1] == 0 /* stdin */) {
73 if ((tmp = dup(stdout_pipe[1])) == -1)
75 close(stdout_pipe[1]);
80 switch ((child = vfork())) {
82 switch ((child = fork())) {
88 close(stdout_pipe[0]);
89 if (dup2(stdin_pipe[0], 0 /* stdin */) == -1)
91 if (stdin_pipe[0] != 0 /* stdin */)
93 if (dup2(stdout_pipe[1], 1 /* stdout */) == -1)
95 if (stdout_pipe[1] != 1 /* stdout */)
96 close(stdout_pipe[1]);
97 execlp(path, path, (char *)NULL);
100 close(stdin_pipe[0]);
101 close(stdout_pipe[1]);
103 *child_stdin = stdin_pipe[1];
104 fcntl(*child_stdin, F_SETFL, O_NONBLOCK);
105 *child_stdout = stdout_pipe[0];
106 fcntl(*child_stdout, F_SETFL, O_NONBLOCK);
112 close(stdout_pipe[0]);
113 close(stdout_pipe[1]);
115 close(stdin_pipe[0]);
116 close(stdin_pipe[1]);
122 __archive_check_child(int in, int out)
124 #if defined(HAVE_POLL) && (defined(HAVE_POLL_H) || defined(HAVE_SYS_POLL_H))
125 struct pollfd fds[2];
131 fds[idx].events = POLLOUT;
136 fds[idx].events = POLLIN;
140 poll(fds, idx, -1); /* -1 == INFTIM, wait forever */
141 #elif defined(HAVE_SELECT)
142 fd_set fds_in, fds_out, fds_error;
148 FD_SET(out, &fds_in);
149 FD_SET(out, &fds_error);
152 FD_SET(in, &fds_out);
153 FD_SET(in, &fds_error);
155 select(in < out ? out + 1 : in + 1, &fds_in, &fds_out, &fds_error, NULL);
161 #endif /* defined(HAVE_PIPE) && defined(HAVE_VFORK) && defined(HAVE_FCNTL) */