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https://github.com/sheumann/hush.git
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58d60c3333
function old new delta xfork - 20 +20 msh_main 1377 1380 +3 mod_process 455 446 -9 forkexit_or_rexec 30 17 -13 expand_variables 1434 1421 -13 open_transformer 91 76 -15 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/4 up/down: 23/-50) Total: -27 bytes
59 lines
1.4 KiB
C
59 lines
1.4 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 is removed by macro magic
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* in include/unarchive.h. On NOMMU, transformer is removed.
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*/
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int FAST_FUNC open_transformer(int src_fd,
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USE_DESKTOP(long long) int FAST_FUNC (*transformer)(int src_fd, int dst_fd),
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const char *transform_prog)
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{
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struct fd_pair fd_pipe;
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int pid;
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xpiped_pair(fd_pipe);
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pid = BB_MMU ? xfork() : xvfork();
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if (pid == 0) {
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/* child process */
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close(fd_pipe.rd); /* We don't want 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.wr);
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(fd_pipe.wr); /* Send EOF */
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close(src_fd);
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}
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/* must be _exit! bug was actually seen here */
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_exit(EXIT_SUCCESS);
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#else
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{
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char *argv[4];
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xmove_fd(src_fd, 0);
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xmove_fd(fd_pipe.wr, 1);
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argv[0] = (char*)transform_prog;
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argv[1] = (char*)"-cf";
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argv[2] = (char*)"-";
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argv[3] = NULL;
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BB_EXECVP(transform_prog, argv);
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bb_perror_msg_and_die("can't exec %s", transform_prog);
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}
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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.wr); /* Don't want to write to the child */
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//TODO: get rid of return value (become void)?
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xmove_fd(fd_pipe.rd, src_fd);
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return src_fd;
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}
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