105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <assert.h>
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static int caught = 0;
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static void caught_signal(int which)
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{
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caught = which;
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}
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static int wait_for_process(pid_t pid)
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{
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int rv = EX_SOFTWARE;
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int stats = 0;
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int i = 0;
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struct sigaction sig_handler;
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sig_handler.sa_handler = caught_signal;
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sig_handler.sa_flags = 0;
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sigaction(SIGALRM, &sig_handler, NULL);
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sigaction(SIGHUP, &sig_handler, NULL);
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sigaction(SIGINT, &sig_handler, NULL);
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sigaction(SIGTERM, &sig_handler, NULL);
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sigaction(SIGPIPE, &sig_handler, NULL);
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/* Loop forever waiting for the process to quit */
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for (i = 0; ;i++) {
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pid_t p = waitpid(pid, &stats, 0);
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if (p == pid) {
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/* child exited. Let's get out of here */
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rv = WIFEXITED(stats) ?
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WEXITSTATUS(stats) :
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(0x80 | WTERMSIG(stats));
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break;
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} else {
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int sig = 0;
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switch (i) {
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case 0:
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/* On the first iteration, pass the signal through */
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sig = caught > 0 ? caught : SIGTERM;
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if (caught == SIGALRM) {
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fprintf(stderr, "Timeout.. killing the process\n");
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}
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break;
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case 1:
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sig = SIGTERM;
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break;
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default:
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sig = SIGKILL;
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break;
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}
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if (kill(pid, sig) < 0) {
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/* Kill failed. Must have lost the process. :/ */
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perror("lost child when trying to kill");
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}
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/* Wait up to 5 seconds for the pid */
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alarm(5);
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}
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}
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return rv;
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}
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static int spawn_and_wait(int argc, char **argv)
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{
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int rv = EX_SOFTWARE;
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pid_t pid = fork();
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assert(argc > 1);
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switch (pid) {
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case -1:
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perror("fork");
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rv = EX_OSERR;
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break; /* NOTREACHED */
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case 0:
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execvp(argv[0], argv);
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perror("exec");
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rv = EX_SOFTWARE;
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break; /* NOTREACHED */
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default:
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rv = wait_for_process(pid);
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}
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return rv;
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}
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int main(int argc, char **argv)
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{
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int naptime = 0;
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assert(argc > 2);
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naptime = atoi(argv[1]);
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/* assert(naptime > 0 && naptime < 1800); */
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alarm(naptime);
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return spawn_and_wait(argc+2, argv+2);
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}
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