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