Infrastructure: Split the files into subdirectories.

[mLib] / sys / daemonize.c

diff --git a/sys/daemonize.c b/sys/daemonize.c
new file mode 100644 (file)
index 0000000..4b1e966
--- /dev/null
+++ b/sys/daemonize.c
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+/* -*-c-*-
+ *
+ * Become a daemon, detaching from terminals
+ *
+ * (c) 2007 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "daemonize.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @detachtty@ --- *
+ *
+ * Arguments:  ---
+ *
+ * Returns:    ---
+ *
+ * Use:                Detaches from the current terminal and ensures it can never
+ *             acquire a new one.  Calls @fork@.
+ */
+
+void detachtty(void)
+{
+#ifdef TIOCNOTTY
+  {
+    int fd;
+    if ((fd = open("/dev/tty", O_RDONLY)) >= 0) {
+      ioctl(fd, TIOCNOTTY);
+      close(fd);
+    }
+  }
+#endif
+  setsid();
+  if (fork() > 0)
+    _exit(0);
+}
+
+/* --- @daemonize@ --- *
+ *
+ * Arguments:  ---
+ *
+ * Returns:    Zero if OK, nonzero on failure.
+ *
+ * Use:                Becomes a daemon.
+ */
+
+int daemonize(void)
+{
+  pid_t kid;
+
+  if ((kid = fork()) < 0)
+    return (-1);
+  if (kid)
+    _exit(0);
+  detachtty();
+  return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/