55 lines
870 B
C
55 lines
870 B
C
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/* See LICENSE file for copyright and license details. */
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/wait.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: respawn [-d N] cmd [args...]\n");
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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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pid_t pid;
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int savederrno;
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unsigned int delay = 0;
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ARGBEGIN {
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case 'd':
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delay = estrtol(EARGF(usage()), 0);
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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 < 1)
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usage();
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while (1) {
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pid = fork();
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if (pid < 0)
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eprintf("fork:");
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switch (pid) {
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case 0:
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if (setsid() < 0)
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eprintf("setsid:");
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execvp(argv[0], argv);
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savederrno = errno;
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weprintf("execvp %s:", argv[0]);
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_exit(savederrno == ENOENT ? 127 : 126);
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break;
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default:
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waitpid(pid, NULL, 0);
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break;
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}
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sleep(delay);
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}
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/* not reachable */
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return EXIT_SUCCESS;
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}
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