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 __FBSDID("$FreeBSD: src/lib/libarchive/filter_fork.c,v 1.2 2007/12/30 04:58:22 kientzle Exp $");
30 #if defined(HAVE_POLL)
31 # if defined(HAVE_POLL_H)
33 # elif defined(HAVE_SYS_POLL_H)
34 # include <sys/poll.h>
36 #elif defined(HAVE_SELECT)
37 # if defined(HAVE_SYS_SELECT_H)
38 # include <sys/select.h>
39 # elif defined(HAVE_UNISTD_H)
50 #include "filter_fork.h"
53 __archive_create_child(const char *path, int *child_stdin, int *child_stdout)
56 int stdin_pipe[2], stdout_pipe[2], tmp;
58 if (pipe(stdin_pipe) == -1)
60 if (stdin_pipe[0] == STDOUT_FILENO) {
61 if ((tmp = dup(stdin_pipe[0])) == -1)
66 if (pipe(stdout_pipe) == -1)
68 if (stdout_pipe[1] == STDIN_FILENO) {
69 if ((tmp = dup(stdout_pipe[1])) == -1)
71 close(stdout_pipe[1]);
75 switch ((child = vfork())) {
80 close(stdout_pipe[0]);
81 if (dup2(stdin_pipe[0], STDIN_FILENO) == -1)
83 if (stdin_pipe[0] != STDIN_FILENO)
85 if (dup2(stdout_pipe[1], STDOUT_FILENO) == -1)
87 if (stdout_pipe[1] != STDOUT_FILENO)
88 close(stdout_pipe[1]);
89 execlp(path, path, (char *)NULL);
93 close(stdout_pipe[1]);
95 *child_stdin = stdin_pipe[1];
96 fcntl(*child_stdin, F_SETFL, O_NONBLOCK);
97 *child_stdout = stdout_pipe[0];
98 fcntl(*child_stdout, F_SETFL, O_NONBLOCK);
104 close(stdout_pipe[0]);
105 close(stdout_pipe[1]);
107 close(stdin_pipe[0]);
108 close(stdin_pipe[1]);
114 __archive_check_child(int in, int out)
116 #if defined(HAVE_POLL)
117 struct pollfd fds[2];
120 fds[0].events = POLLOUT;
122 fds[1].events = POLLIN;
124 poll(fds, 2, -1); /* -1 == INFTIM, wait forever */
125 #elif defined(HAVE_SELECT)
126 fd_set fds_in, fds_out, fds_error;
129 FD_SET(out, &fds_in);
131 FD_SET(in, &fds_out);
133 FD_SET(in, &fds_error);
134 FD_SET(out, &fds_error);
135 select(in < out ? out + 1 : in + 1, &fds_in, &fds_out, &fds_error, NULL);