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_VFORK) && defined(HAVE_FCNTL)
31 __FBSDID("$FreeBSD: src/lib/libarchive/filter_fork.c,v 1.2 2007/12/30 04:58:22 kientzle Exp $");
33 #if defined(HAVE_POLL)
34 # if defined(HAVE_POLL_H)
36 # elif defined(HAVE_SYS_POLL_H)
37 # include <sys/poll.h>
39 #elif defined(HAVE_SELECT)
40 # if defined(HAVE_SYS_SELECT_H)
41 # include <sys/select.h>
42 # elif defined(HAVE_UNISTD_H)
53 #include "filter_fork.h"
56 __archive_create_child(const char *path
, int *child_stdin
, int *child_stdout
)
59 int stdin_pipe
[2], stdout_pipe
[2], tmp
;
61 if (pipe(stdin_pipe
) == -1)
63 if (stdin_pipe
[0] == STDOUT_FILENO
) {
64 if ((tmp
= dup(stdin_pipe
[0])) == -1)
69 if (pipe(stdout_pipe
) == -1)
71 if (stdout_pipe
[1] == STDIN_FILENO
) {
72 if ((tmp
= dup(stdout_pipe
[1])) == -1)
74 close(stdout_pipe
[1]);
78 switch ((child
= vfork())) {
83 close(stdout_pipe
[0]);
84 if (dup2(stdin_pipe
[0], STDIN_FILENO
) == -1)
86 if (stdin_pipe
[0] != STDIN_FILENO
)
88 if (dup2(stdout_pipe
[1], STDOUT_FILENO
) == -1)
90 if (stdout_pipe
[1] != STDOUT_FILENO
)
91 close(stdout_pipe
[1]);
92 execlp(path
, path
, (char *)NULL
);
96 close(stdout_pipe
[1]);
98 *child_stdin
= stdin_pipe
[1];
99 fcntl(*child_stdin
, F_SETFL
, O_NONBLOCK
);
100 *child_stdout
= stdout_pipe
[0];
101 fcntl(*child_stdout
, F_SETFL
, O_NONBLOCK
);
107 close(stdout_pipe
[0]);
108 close(stdout_pipe
[1]);
110 close(stdin_pipe
[0]);
111 close(stdin_pipe
[1]);
117 __archive_check_child(int in
, int out
)
119 #if defined(HAVE_POLL)
120 struct pollfd fds
[2];
123 fds
[0].events
= POLLOUT
;
125 fds
[1].events
= POLLIN
;
127 poll(fds
, 2, -1); /* -1 == INFTIM, wait forever */
128 #elif defined(HAVE_SELECT)
129 fd_set fds_in
, fds_out
, fds_error
;
132 FD_SET(out
, &fds_in
);
134 FD_SET(in
, &fds_out
);
136 FD_SET(in
, &fds_error
);
137 FD_SET(out
, &fds_error
);
138 select(in
< out
? out
+ 1 : in
+ 1, &fds_in
, &fds_out
, &fds_error
, NULL
);
144 #endif /* defined(HAVE_PIPE) && defined(HAVE_VFORK) && defined(HAVE_FCNTL) */