From 9a88f7da453eadc72d8f333700dbd80777feecd1 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@tele2.at>
Date: Sun, 25 Feb 2018 14:33:19 +0100
Subject: Initial commit

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
---
 initd/runlst.c | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 initd/runlst.c

(limited to 'initd/runlst.c')

diff --git a/initd/runlst.c b/initd/runlst.c
new file mode 100644
index 0000000..cf75126
--- /dev/null
+++ b/initd/runlst.c
@@ -0,0 +1,128 @@
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+#include <ctype.h>
+#include <fcntl.h>
+
+#include "init.h"
+
+extern char **environ;
+
+static NORETURN void split_and_exec(char *cmd)
+{
+	char *argv[128];
+	size_t i = 0;
+
+	while (*cmd != '\0') {
+		argv[i++] = cmd;	/* FIXME: buffer overflow!! */
+
+		while (*cmd != '\0' && !isspace(*cmd))
+			++cmd;
+
+		if (isspace(*cmd)) {
+			*(cmd++) = '\0';
+
+			while (isspace(*cmd))
+				++cmd;
+		}
+	}
+
+	argv[i] = NULL;
+
+	execve(argv[0], argv, environ);
+	perror(argv[0]);
+	exit(EXIT_FAILURE);
+}
+
+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;
+}
+
+int runlst_wait(char **exec, size_t num, const char *ctty)
+{
+	pid_t ret, pid;
+	int status;
+	size_t i;
+
+	for (i = 0; i < num; ++i) {
+		pid = fork();
+
+		if (pid == 0) {
+			if (child_setup(ctty))
+				exit(EXIT_FAILURE);
+			split_and_exec(exec[i]);
+		}
+
+		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(char **exec, size_t num, const char *ctty)
+{
+	int status;
+	pid_t pid;
+
+	pid = fork();
+
+	if (pid == 0) {
+		if (child_setup(ctty))
+			exit(EXIT_FAILURE);
+
+		if (num > 1) {
+			status = runlst_wait(exec, num, NULL);
+			exit(status);
+		} else {
+			split_and_exec(exec[0]);
+		}
+	}
+
+	if (pid == -1)
+		perror("fork");
+
+	return pid;
+}
-- 
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