77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [-nsux] file cmd [arg ...]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int fd, status, savederrno, flags = LOCK_EX, nonblk = 0;
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pid_t pid;
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ARGBEGIN {
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case 'n':
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nonblk = LOCK_NB;
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break;
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case 's':
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flags = LOCK_SH;
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break;
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case 'u':
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flags = LOCK_UN;
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break;
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case 'x':
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flags = LOCK_EX;
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break;
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default:
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usage();
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} ARGEND;
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if (argc < 2)
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usage();
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if ((fd = open(*argv, O_RDONLY | O_CREAT, 0644)) < 0)
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eprintf("open %s:", *argv);
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if (flock(fd, flags | nonblk)) {
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if (nonblk && errno == EWOULDBLOCK)
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return 1;
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eprintf("flock:");
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}
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switch ((pid = fork())) {
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case -1:
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eprintf("fork:");
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case 0:
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argv++;
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execvp(*argv, argv);
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savederrno = errno;
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weprintf("execvp %s:", *argv);
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_exit(126 + (savederrno == ENOENT));
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default:
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break;
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}
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waitpid(pid, &status, 0);
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if (WIFSIGNALED(status))
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return 128 + WTERMSIG(status);
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if (WIFEXITED(status))
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return WEXITSTATUS(status);
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if (close(fd) < 0)
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eprintf("close:");
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return 0;
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}
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