61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include "unarchive.h"
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/* transformer(), more than meets the eye */
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/*
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* On MMU machine, the transform_prog and ... are stripped
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* by a macro in include/unarchive.h. On NOMMU, transformer is stripped.
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*/
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int open_transformer(int src_fd,
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USE_DESKTOP(long long) int (*transformer)(int src_fd, int dst_fd),
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const char *transform_prog, ...)
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{
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int fd_pipe[2];
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int pid;
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xpipe(fd_pipe);
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#if BB_MMU
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pid = fork();
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#else
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pid = vfork();
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#endif
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if (pid == -1)
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bb_perror_msg_and_die("fork failed");
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if (pid == 0) {
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#if !BB_MMU
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va_list ap;
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#endif
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/* child process */
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close(fd_pipe[0]); /* We don't wan't to read from the parent */
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// FIXME: error check?
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#if BB_MMU
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transformer(src_fd, fd_pipe[1]);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(fd_pipe[1]); /* Send EOF */
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close(src_fd);
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}
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exit(0);
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#else
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xmove_fd(src_fd, 0);
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xmove_fd(fd_pipe[1], 1);
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va_start(ap, transform_prog);
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/* hoping that va_list -> char** on our CPU is working... */
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BB_EXECVP(transform_prog, (void*)ap);
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bb_perror_msg_and_die("exec failed");
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#endif
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/* notreached */
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}
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/* parent process */
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close(fd_pipe[1]); /* Don't want to write to the child */
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return fd_pipe[0];
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}
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