Contents of /trunk/mkinitrd-magellan/busybox/archival/libunarchive/open_transformer.c
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Fri Apr 24 18:33:46 2009 UTC (15 years ago) by niro
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File size: 1456 byte(s)
Fri Apr 24 18:33:46 2009 UTC (15 years ago) by niro
File MIME type: text/plain
File size: 1456 byte(s)
-updated to busybox-1.13.4
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 | } |