blob: 604ad633f5571cc5fd6b35790d3eb995faeab8e2 [file] [log] [blame]
/*-
* Copyright (c) 2007 Joerg Sonnenberger
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "archive_platform.h"
/* This capability is only available on POSIX systems. */
#if defined(HAVE_PIPE) && defined(HAVE_FCNTL) && \
(defined(HAVE_FORK) || defined(HAVE_VFORK))
__FBSDID("$FreeBSD: head/lib/libarchive/filter_fork.c 182958 2008-09-12 05:33:00Z kientzle $");
#if defined(HAVE_POLL)
# if defined(HAVE_POLL_H)
# include <poll.h>
# elif defined(HAVE_SYS_POLL_H)
# include <sys/poll.h>
# endif
#elif defined(HAVE_SELECT)
# if defined(HAVE_SYS_SELECT_H)
# include <sys/select.h>
# elif defined(HAVE_UNISTD_H)
# include <unistd.h>
# endif
#endif
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "filter_fork.h"
pid_t
__archive_create_child(const char *path, int *child_stdin, int *child_stdout)
{
pid_t child;
int stdin_pipe[2], stdout_pipe[2], tmp;
if (pipe(stdin_pipe) == -1)
goto state_allocated;
if (stdin_pipe[0] == 1 /* stdout */) {
if ((tmp = dup(stdin_pipe[0])) == -1)
goto stdin_opened;
close(stdin_pipe[0]);
stdin_pipe[0] = tmp;
}
if (pipe(stdout_pipe) == -1)
goto stdin_opened;
if (stdout_pipe[1] == 0 /* stdin */) {
if ((tmp = dup(stdout_pipe[1])) == -1)
goto stdout_opened;
close(stdout_pipe[1]);
stdout_pipe[1] = tmp;
}
#if HAVE_VFORK
switch ((child = vfork())) {
#else
switch ((child = fork())) {
#endif
case -1:
goto stdout_opened;
case 0:
close(stdin_pipe[1]);
close(stdout_pipe[0]);
if (dup2(stdin_pipe[0], 0 /* stdin */) == -1)
_exit(254);
if (stdin_pipe[0] != 0 /* stdin */)
close(stdin_pipe[0]);
if (dup2(stdout_pipe[1], 1 /* stdout */) == -1)
_exit(254);
if (stdout_pipe[1] != 1 /* stdout */)
close(stdout_pipe[1]);
execlp(path, path, (char *)NULL);
_exit(254);
default:
close(stdin_pipe[0]);
close(stdout_pipe[1]);
*child_stdin = stdin_pipe[1];
fcntl(*child_stdin, F_SETFL, O_NONBLOCK);
*child_stdout = stdout_pipe[0];
fcntl(*child_stdout, F_SETFL, O_NONBLOCK);
}
return child;
stdout_opened:
close(stdout_pipe[0]);
close(stdout_pipe[1]);
stdin_opened:
close(stdin_pipe[0]);
close(stdin_pipe[1]);
state_allocated:
return -1;
}
void
__archive_check_child(int in, int out)
{
#if defined(HAVE_POLL)
struct pollfd fds[2];
int idx;
idx = 0;
if (in != -1) {
fds[idx].fd = in;
fds[idx].events = POLLOUT;
++idx;
}
if (out != -1) {
fds[idx].fd = out;
fds[idx].events = POLLIN;
++idx;
}
poll(fds, idx, -1); /* -1 == INFTIM, wait forever */
#elif defined(HAVE_SELECT)
fd_set fds_in, fds_out, fds_error;
FD_ZERO(&fds_in);
FD_ZERO(&fds_out);
FD_ZERO(&fds_error);
if (out != -1) {
FD_SET(out, &fds_in);
FD_SET(out, &fds_error);
}
if (in != -1) {
FD_SET(in, &fds_out);
FD_SET(in, &fds_error);
}
select(in < out ? out + 1 : in + 1, &fds_in, &fds_out, &fds_error, NULL);
#else
sleep(1);
#endif
}
#endif /* defined(HAVE_PIPE) && defined(HAVE_VFORK) && defined(HAVE_FCNTL) */