mirror of
https://github.com/pygos/init.git
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120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <sys/wait.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include "init.h"
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static int child_setup(const char *ctty)
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{
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int fd;
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sigreset();
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if (ctty != NULL) {
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fd = open(ctty, O_RDWR);
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if (fd < 0) {
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perror(ctty);
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return -1;
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}
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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close(STDERR_FILENO);
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setsid();
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dup2(fd, STDIN_FILENO);
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dup2(fd, STDOUT_FILENO);
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dup2(fd, STDERR_FILENO);
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close(fd);
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}
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return 0;
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}
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static NORETURN void argv_exec(exec_t *e)
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{
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char **argv = alloca(e->argc + 1), *ptr;
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int i;
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for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
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argv[i] = ptr;
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argv[i] = NULL;
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execvp(argv[0], argv);
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perror(argv[0]);
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exit(EXIT_FAILURE);
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}
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int runlst_wait(exec_t *list, const char *ctty)
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{
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pid_t ret, pid;
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int status;
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for (; list != NULL; list = list->next) {
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pid = fork();
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if (pid == 0) {
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if (child_setup(ctty))
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exit(EXIT_FAILURE);
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argv_exec(list);
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}
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if (pid == -1) {
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perror("fork");
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return EXIT_FAILURE;
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}
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do {
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ret = waitpid(pid, &status, 0);
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} while (ret != pid);
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if (!WIFEXITED(status))
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return EXIT_FAILURE;
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if (WEXITSTATUS(status) != EXIT_SUCCESS)
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return WEXITSTATUS(status);
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}
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return EXIT_SUCCESS;
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}
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pid_t runlst(exec_t *list, const char *ctty)
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{
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pid_t pid = fork();
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if (pid == 0) {
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if (child_setup(ctty))
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exit(EXIT_FAILURE);
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if (list->next != NULL)
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exit(runlst_wait(list, NULL));
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argv_exec(list);
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}
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if (pid == -1)
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perror("fork");
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return pid;
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}
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