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,
	IF_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);
	pid = BB_MMU ? xfork() : xvfork();
	if (pid == 0) {
		/* Child */
		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 execute '%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	IF_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	pid = BB_MMU ? xfork() : xvfork();
23	if (pid == 0) {
24	/* Child */
25	close(fd_pipe.rd); /* we don't want to read from the parent */
26	// FIXME: error check?
27	#if BB_MMU
28	transformer(fd, fd_pipe.wr);
29	if (ENABLE_FEATURE_CLEAN_UP) {
30	close(fd_pipe.wr); /* send EOF */
31	close(fd);
32	}
33	/* must be _exit! bug was actually seen here */
34	_exit(EXIT_SUCCESS);
35	#else
36	{
37	char *argv[4];
38	xmove_fd(fd, 0);
39	xmove_fd(fd_pipe.wr, 1);
40	argv[0] = (char*)transform_prog;
41	argv[1] = (char*)"-cf";
42	argv[2] = (char*)"-";
43	argv[3] = NULL;
44	BB_EXECVP(transform_prog, argv);
45	bb_perror_msg_and_die("can't execute '%s'", transform_prog);
46	}
47	#endif
48	/* notreached */
49	}
50
51	/* parent process */
52	close(fd_pipe.wr); /* don't want to write to the child */
53	xmove_fd(fd_pipe.rd, fd);
54	}