95 lines
2.4 KiB
C
95 lines
2.4 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 <sys/types.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/event.h>
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#include <sys/time.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 watch(int kq, char *path) {
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int fd = open(path, O_RDONLY | O_CLOEXEC);
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if (fd < 0) err(EX_NOINPUT, "%s", path);
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struct kevent event;
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EV_SET(
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&event, fd, EVFILT_VNODE, EV_ADD | EV_CLEAR,
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NOTE_WRITE | NOTE_DELETE, 0, path
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);
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int nevents = kevent(kq, &event, 1, NULL, 0, NULL);
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if (nevents < 0) err(EX_OSERR, "kevent");
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}
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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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int kq = kqueue();
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if (kq < 0) err(EX_OSERR, "kqueue");
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fcntl(kq, F_SETFD, FD_CLOEXEC);
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int init = 0;
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for (int opt; 0 < (opt = getopt(argc, argv, "f:i"));) {
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switch (opt) {
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break; case 'f': watch(kq, optarg);
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break; case 'i': init = 1;
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break; default: return EX_USAGE;
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}
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}
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argc -= optind;
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argv += optind;
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if (!argc) errx(EX_USAGE, "command required");
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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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if (init) run(argv);
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for (;;) {
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struct kevent event;
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int nevents = kevent(kq, NULL, 0, &event, 1, NULL);
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if (nevents < 0) err(EX_OSERR, "kevent");
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if (event.fflags & NOTE_DELETE) {
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errx(EX_TEMPFAIL, "%s: file removed", (char *)event.udata);
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}
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run(argv);
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}
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}
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