From f38163772cb8ca25c440393132e8678e65437320 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Sun, 16 Sep 2018 21:52:46 +0200 Subject: Add simple cron implementation Signed-off-by: David Oberhollenzer --- crond/runjob.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 crond/runjob.c (limited to 'crond/runjob.c') diff --git a/crond/runjob.c b/crond/runjob.c new file mode 100644 index 0000000..7650748 --- /dev/null +++ b/crond/runjob.c @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-3.0-or-later */ +/* + * Copyright (C) 2018 - David Oberhollenzer + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ +#include "gcrond.h" + +int runjob(crontab_t *tab) +{ + struct sigaction act; + pid_t pid; + exec_t *e; + int ret; + + if (tab->exec == NULL) + return 0; + + pid = fork(); + if (pid == -1) { + perror("fork"); + return -1; + } + + if (pid != 0) { + tab->pid = pid; + return 0; + } + + /* XXX: inside the child process */ + memset(&act, 0, sizeof(act)); + act.sa_handler = SIG_DFL; + sigaction(SIGINT, &act, NULL); + sigaction(SIGTERM, &act, NULL); + sigaction(SIGHUP, &act, NULL); + + if (setup_tty(tab->ctty, tab->tty_truncate)) + exit(EXIT_FAILURE); + + if (tab->gid != 0) { + if (setresgid(tab->gid, tab->gid, tab->gid)) { + perror("setgid"); + exit(EXIT_FAILURE); + } + } + + if (tab->uid != 0) { + if (setresuid(tab->uid, tab->uid, tab->uid)) { + perror("setuid"); + exit(EXIT_FAILURE); + } + } + + if (tab->exec->next == NULL) + argv_exec(tab->exec); + + for (e = tab->exec; e != NULL; e = e->next) { + pid = fork(); + if (pid == -1) { + perror("fork"); + exit(EXIT_FAILURE); + } + + if (pid == 0) + argv_exec(e); + + while (waitpid(pid, &ret, 0) != pid) + ; + + ret = WIFEXITED(ret) ? WEXITSTATUS(ret) : EXIT_FAILURE; + if (ret != EXIT_SUCCESS) + break; + } + + exit(ret); +} -- cgit v1.2.3