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	/* 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	/*
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	{
18	struct fd_pair fd_pipe;
19	int pid;
20
21	xpiped_pair(fd_pipe);
22
23	#if BB_MMU
24	pid = fork();
25	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
33	if (pid == 0) {
34	/* child process */
35	close(fd_pipe.rd); /* we don't want to read from the parent */
36	// FIXME: error check?
37	#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	/* notreached */
59	}
60
61	/* parent process */
62	close(fd_pipe.wr); /* don't want to write to the child */
63	xmove_fd(fd_pipe.rd, fd);
64	}