Diff of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/open_transformer.c

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	revision 815 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
#	Line 3	Line 3
3	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
4	*/	*/
5
	#include <stdlib.h>
	#include <unistd.h>
6	#include "libbb.h"	#include "libbb.h"
7	#include "unarchive.h"	#include "unarchive.h"
8
9	/* transformer(), more than meets the eye */	/* transformer(), more than meets the eye */
10	int open_transformer(int src_fd,	/*
11	USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd))	* 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	int fd_pipe[2];	struct fd_pair fd_pipe;
19	int pid;	int pid;
20
21	if (pipe(fd_pipe) != 0) {	xpiped_pair(fd_pipe);
	bb_perror_msg_and_die("can't create pipe");
	}
22
23		#if BB_MMU
24	pid = fork();	pid = fork();
25	if (pid == -1) {	if (pid == -1)
26	bb_perror_msg_and_die("fork failed");	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) {	if (pid == 0) {
34	/* child process */	/* child process */
35	close(fd_pipe[0]); /* We don't wan't to read from the parent */	close(fd_pipe.rd); /* we don't want to read from the parent */
36	// FIXME: error check?	// FIXME: error check?
37	transformer(src_fd, fd_pipe[1]);	#if BB_MMU
38	close(fd_pipe[1]); /* Send EOF */	transformer(fd, fd_pipe.wr);
39	close(src_fd);	if (ENABLE_FEATURE_CLEAN_UP) {
40	exit(0);	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 */	/* notreached */
59	}	}
60
61	/* parent process */	/* parent process */
62	close(fd_pipe[1]); /* Don't want to write to the child */	close(fd_pipe.wr); /* don't want to write to the child */
63		xmove_fd(fd_pipe.rd, fd);
	return fd_pipe[0];
64	}	}

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Legend: Removed from v.815   changed lines   Added in v.816