1 files changed, 62 insertions, 0 deletions
diff --git a/daemon.c b/daemon.c
new file mode 100644
index 0000000..be2bb17
--- /dev/null
+++ b/daemon.c
@@ -0,0 +1,62 @@
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <errno.h>
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+
+#include "daemon.h"
+
+int daemon_start(int ignsigcld)
+{
+	/* Code to initialiaze a daemon process. Taken from _UNIX Network	*/
+	/* Programming_ pp.72-85, by W. Richard Stephens, Prentice		*/
+	/* Hall PTR, 1990							*/
+
+	register int childpid, fd;
+
+	/* If started by init, don't bother */
+	if (getppid() == 1)
+		goto out;
+
+	/* Ignore the terminal stop signals */
+	signal(SIGTTOU, SIG_IGN);
+	signal(SIGTTIN, SIG_IGN);
+	signal(SIGTSTP, SIG_IGN);
+
+	/* Fork and let parent exit, insures we're not a process group leader */
+	if ((childpid = fork()) < 0) {
+		return 0;
+	} else if (childpid > 0) {
+		exit(0);
+	}
+
+	/* Disassociate from controlling terminal and process group.		*/
+	/* Ensure the process can't reacquire a new controlling terminal.	*/
+	if (setpgrp() == -1)
+		return 0;
+
+	if ((fd = open("/dev/tty", O_RDWR)) >= 0) {
+		/* loose controlling tty */
+		ioctl(fd, TIOCNOTTY, NULL);
+		close(fd);
+	}
+
+out:
+	/* Move the current directory to root, to make sure we aren't on a	*/
+	/* mounted filesystem.							*/
+	chdir("/");
+
+	/* Clear any inherited file mode creation mask.	*/
+	umask(0);
+
+	if (ignsigcld)
+		signal(SIGCHLD, SIG_IGN);
+
+	/* That's it, we're a "daemon" process now */
+	return 1;
+}