1 files changed, 138 insertions, 0 deletions
diff --git a/cmd/runsvc/runsvc.c b/cmd/runsvc/runsvc.c
new file mode 100644
index 0000000..a8e5bb2
--- /dev/null
+++ b/cmd/runsvc/runsvc.c
@@ -0,0 +1,138 @@
+/* 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 "runsvc.h"
+
+static int setup_tty(const char *ctty)
+{
+	int fd;
+
+	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);
+}
+
+static int runlst_wait(exec_t *list)
+{
+	pid_t ret, pid;
+	int status;
+
+	for (; list != NULL; list = list->next) {
+		pid = fork();
+
+		if (pid == 0)
+			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;
+}
+
+/*****************************************************************************/
+
+int main(int argc, char **argv)
+{
+	int dirfd, ret = EXIT_FAILURE;
+	service_t *svc = NULL;
+
+	if (argc != 3) {
+		fputs("usage: runsvc <directory> <filename>\n", stderr);
+		goto out;
+	}
+
+	if (getppid() != 1) {
+		fputs("must be run by init!\n", stderr);
+		goto out;
+	}
+
+	dirfd = open(argv[1], O_RDONLY | O_DIRECTORY);
+	if (dirfd < 0) {
+		perror(argv[1]);
+		goto out;
+	}
+
+	svc = rdsvc(dirfd, argv[2], RDSVC_NO_FNAME | RDSVC_NO_DEPS);
+	close(dirfd);
+	if (svc == NULL)
+		goto out;
+
+	if (svc->exec == NULL) {
+		ret = EXIT_SUCCESS;
+		goto out;
+	}
+
+	if (initenv())
+		goto out;
+
+	if (setup_tty(svc->ctty))
+		goto out;
+
+	if (svc->exec->next == NULL)
+		argv_exec(svc->exec);
+
+	ret = runlst_wait(svc->exec);
+out:
+	delsvc(svc);
+	return ret;
+}