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[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 4 | */
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| 5 |
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| 6 | #include "libbb.h"
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| 7 | #include "unarchive.h"
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| 8 |
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| 9 | /* transformer(), more than meets the eye */
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[1765] | 10 | /*
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| 11 | * On MMU machine, the transform_prog and ... are stripped
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| 12 | * by a macro in include/unarchive.h. On NOMMU, transformer is stripped.
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| 13 | */
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| 14 | int open_transformer(int src_fd,
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| 15 | USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
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| 16 | const char *transform_prog, ...)
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[821] | 17 | {
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| 18 | int fd_pipe[2];
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| 19 | int pid;
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| 20 |
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[1765] | 21 | xpipe(fd_pipe);
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[821] | 22 |
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[1765] | 23 | #if BB_MMU
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[821] | 24 | pid = fork();
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[1765] | 25 | #else
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| 26 | pid = vfork();
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| 27 | #endif
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| 28 | if (pid == -1)
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| 29 | bb_perror_msg_and_die("fork failed");
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[821] | 30 |
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| 31 | if (pid == 0) {
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[1765] | 32 | #if !BB_MMU
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| 33 | va_list ap;
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| 34 | #endif
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[821] | 35 | /* child process */
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[1765] | 36 | close(fd_pipe[0]); /* We don't wan't to read from the parent */
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| 37 | // FIXME: error check?
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| 38 | #if BB_MMU
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| 39 | transformer(src_fd, fd_pipe[1]);
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| 40 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 41 | close(fd_pipe[1]); /* Send EOF */
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| 42 | close(src_fd);
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| 43 | }
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| 44 | exit(0);
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| 45 | #else
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| 46 | xmove_fd(src_fd, 0);
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| 47 | xmove_fd(fd_pipe[1], 1);
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| 48 | va_start(ap, transform_prog);
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| 49 | BB_EXECVP(transform_prog, ap);
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| 50 | bb_perror_and_die("exec failed");
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| 51 | #endif
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| 52 | /* notreached */
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[821] | 53 | }
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| 54 |
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| 55 | /* parent process */
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| 56 | close(fd_pipe[1]); /* Don't want to write to the child */
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| 57 |
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[1765] | 58 | return fd_pipe[0];
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[821] | 59 | }
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