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/* 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 <https://www.gnu.org/licenses/>.
*/
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include "init.h"
static int child_setup(const char *ctty)
{
sigset_t mask;
int fd;
sigemptyset(&mask);
sigprocmask(SIG_SETMASK, &mask, NULL);
if (ctty != NULL) {
fd = open(ctty, O_RDWR);
if (fd < 0) {
perror(ctty);
return -1;
}
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
setsid();
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
close(fd);
}
return 0;
}
static NORETURN void argv_exec(exec_t *e)
{
char **argv = alloca(e->argc + 1), *ptr;
int i;
for (ptr = e->args, i = 0; i < e->argc; ++i, ptr += strlen(ptr) + 1)
argv[i] = ptr;
argv[i] = NULL;
execvp(argv[0], argv);
perror(argv[0]);
exit(EXIT_FAILURE);
}
int runlst_wait(exec_t *list, const char *ctty)
{
pid_t ret, pid;
int status;
for (; list != NULL; list = list->next) {
pid = fork();
if (pid == 0) {
if (child_setup(ctty))
exit(EXIT_FAILURE);
argv_exec(list);
}
if (pid == -1) {
perror("fork");
return EXIT_FAILURE;
}
do {
ret = waitpid(pid, &status, 0);
} while (ret != pid);
if (!WIFEXITED(status))
return EXIT_FAILURE;
if (WEXITSTATUS(status) != EXIT_SUCCESS)
return WEXITSTATUS(status);
}
return EXIT_SUCCESS;
}
pid_t runlst(exec_t *list, const char *ctty)
{
pid_t pid = fork();
if (pid == 0) {
if (child_setup(ctty))
exit(EXIT_FAILURE);
if (list->next != NULL)
exit(runlst_wait(list, NULL));
argv_exec(list);
}
if (pid == -1)
perror("fork");
return pid;
}
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