mirror of
https://github.com/pygos/init.git
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145 lines
2.6 KiB
C
145 lines
2.6 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 <signal.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 <errno.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include "init.h"
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extern char **environ;
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static NORETURN void split_and_exec(char *cmd)
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{
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char *argv[128];
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size_t i = 0;
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while (*cmd != '\0') {
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argv[i++] = cmd; /* FIXME: buffer overflow!! */
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while (*cmd != '\0' && !isspace(*cmd))
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++cmd;
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if (isspace(*cmd)) {
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*(cmd++) = '\0';
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while (isspace(*cmd))
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++cmd;
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}
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}
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argv[i] = NULL;
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execve(argv[0], argv, environ);
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perror(argv[0]);
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exit(EXIT_FAILURE);
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}
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static int child_setup(const char *ctty)
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{
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sigset_t mask;
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int fd;
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sigemptyset(&mask);
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sigprocmask(SIG_SETMASK, &mask, NULL);
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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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int runlst_wait(char **exec, size_t num, 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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size_t i;
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for (i = 0; i < num; ++i) {
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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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split_and_exec(exec[i]);
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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(char **exec, size_t num, const char *ctty)
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{
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int status;
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pid_t pid;
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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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if (num > 1) {
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status = runlst_wait(exec, num, NULL);
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exit(status);
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} else {
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split_and_exec(exec[0]);
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}
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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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