archival/libunarchive/open_transformer.c

/* vi: set sw=4 ts=4: */
/*
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"
#include "unarchive.h"

/* transformer(), more than meets the eye */
/*
 * On MMU machine, the transform_prog is removed by macro magic
 * in include/unarchive.h. On NOMMU, transformer is removed.
 */
void FAST_FUNC open_transformer(int fd,
	USE_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd),
	const char *transform_prog)
{
	struct fd_pair fd_pipe;
	int pid;

	xpiped_pair(fd_pipe);

#if BB_MMU
	pid = fork();
	if (pid == -1)
		bb_perror_msg_and_die("vfork" + 1);
#else
	pid = vfork();
	if (pid == -1)
		bb_perror_msg_and_die("vfork");
#endif

	if (pid == 0) {
		/* child process */
		close(fd_pipe.rd); /* we don't want to read from the parent */
		// FIXME: error check?
#if BB_MMU
		transformer(fd, fd_pipe.wr);
		if (ENABLE_FEATURE_CLEAN_UP) {
			close(fd_pipe.wr); /* send EOF */
			close(fd);
		}
		/* must be _exit! bug was actually seen here */
		_exit(EXIT_SUCCESS);
#else
		{
			char *argv[4];
			xmove_fd(fd, 0);
			xmove_fd(fd_pipe.wr, 1);
			argv[0] = (char*)transform_prog;
			argv[1] = (char*)"-cf";
			argv[2] = (char*)"-";
			argv[3] = NULL;
			BB_EXECVP(transform_prog, argv);
			bb_perror_msg_and_die("can't exec %s", transform_prog);
		}
#endif
		/* notreached */
	}

	/* parent process */
	close(fd_pipe.wr); /* don't want to write to the child */
	xmove_fd(fd_pipe.rd, fd);
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4			*/
5
6			#include "libbb.h"
7			#include "unarchive.h"
8
9			/* transformer(), more than meets the eye */
10	niro	816	/*
11			* On MMU machine, the transform_prog is removed by macro magic
12			* in include/unarchive.h. On NOMMU, transformer is removed.
13			*/
14			void FAST_FUNC open_transformer(int fd,
15			USE_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd),
16			const char *transform_prog)
17	niro	532	{
18	niro	816	struct fd_pair fd_pipe;
19	niro	532	int pid;
20
21	niro	816	xpiped_pair(fd_pipe);
22	niro	532
23	niro	816	#if BB_MMU
24	niro	532	pid = fork();
25	niro	816	if (pid == -1)
26			bb_perror_msg_and_die("vfork" + 1);
27			#else
28			pid = vfork();
29			if (pid == -1)
30			bb_perror_msg_and_die("vfork");
31			#endif
32	niro	532
33			if (pid == 0) {
34			/* child process */
35	niro	816	close(fd_pipe.rd); /* we don't want to read from the parent */
36	niro	532	// FIXME: error check?
37	niro	816	#if BB_MMU
38			transformer(fd, fd_pipe.wr);
39			if (ENABLE_FEATURE_CLEAN_UP) {
40			close(fd_pipe.wr); /* send EOF */
41			close(fd);
42			}
43			/* must be _exit! bug was actually seen here */
44			_exit(EXIT_SUCCESS);
45			#else
46			{
47			char *argv[4];
48			xmove_fd(fd, 0);
49			xmove_fd(fd_pipe.wr, 1);
50			argv[0] = (char*)transform_prog;
51			argv[1] = (char*)"-cf";
52			argv[2] = (char*)"-";
53			argv[3] = NULL;
54			BB_EXECVP(transform_prog, argv);
55			bb_perror_msg_and_die("can't exec %s", transform_prog);
56			}
57			#endif
58	niro	532	/* notreached */
59			}
60
61			/* parent process */
62	niro	816	close(fd_pipe.wr); /* don't want to write to the child */
63			xmove_fd(fd_pipe.rd, fd);
64	niro	532	}