71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* Copyright (C) 2021 C. McEnroe <june@causal.agency>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <sysexits.h>
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#include <unistd.h>
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static void run(char *argv[]) {
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pid_t pid = fork();
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if (pid < 0) err(EX_OSERR, "fork");
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if (!pid) {
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execvp(argv[0], argv);
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err(126, "%s", argv[0]);
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}
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int status;
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pid = wait(&status);
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if (pid < 0) err(EX_OSERR, "wait");
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if (WIFEXITED(status)) {
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status = WEXITSTATUS(status);
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if (status) exit(status);
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} else {
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exit(status);
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}
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}
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int main(int argc, char *argv[]) {
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if (argc < 2) errx(EX_USAGE, "interval required");
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if (argc < 3) errx(EX_USAGE, "command required");
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unsigned interval = 0;
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char *spec = argv[1];
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while (*spec) {
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unsigned num = strtoul(spec, &spec, 10);
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switch (*spec) {
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break; case '\0': interval += num;
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break; case 's': spec++; interval += num;
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break; case 'm': spec++; interval += 60 * num;
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break; case 'h': spec++; interval += 60 * 60 * num;
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break; default: errx(EX_USAGE, "invalid interval unit %c", *spec);
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}
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}
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if (!interval) errx(EX_USAGE, "invalid zero interval");
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#ifdef __OpenBSD__
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int error = pledge("stdio proc exec", NULL);
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if (error) err(EX_OSERR, "pledge");
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#endif
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for (;;) {
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run(&argv[2]);
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sleep(interval);
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}
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}
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