Initial addition into CVS. Moves various functions relating the daemon

processes.  Added a portable signal handler setting function.

1 files changed, 74 insertions, 0 deletions

diff --git a/src/daemon.c b/src/daemon.c
new file mode 100644
index 0000000..ec553da
--- /dev/null
+++ b/src/daemon.c
@@ -0,0 +1,74 @@
+/* $Id: daemon.c,v 1.1 2002-05-23 04:39:32 rjkaes Exp $
+ *
+ * This file contains functions which are useful when writing a
+ * daemon process.  The functions include a "makedaemon" function and
+ * a function to portably set a signal handler.
+ *
+ * Copyright (C) 2002  Robert James Kaes (rjkaes@flarenet.com)
+ *
+ * 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 2, 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.
+ */
+
+#include "tinyproxy.h"
+
+#include "daemon.h"
+
+/*
+ * Fork a child process and then kill the parent so make the calling
+ * program a daemon process.
+ */
+void
+makedaemon(void)
+{
+	if (fork() != 0)
+		exit(0);
+
+	setsid();
+	set_signal_handler(SIGHUP, SIG_IGN);
+
+	if (fork() != 0)
+		exit(0);
+
+	chdir("/");
+	umask(077);
+
+	close(0);
+	close(1);
+	close(2);
+}
+
+/*
+ * Pass a signal number and a signal handling function into this function
+ * to handle signals sent to the process.
+ */
+signal_func *
+set_signal_handler(int signo, signal_func *func)
+{
+	struct sigaction act, oact;
+
+	act.sa_handler = func;
+	sigemptyset(&act.sa_mask);
+	act.sa_flags = 0;
+	if (signo == SIGALRM) {
+#ifdef SA_INTERRUPT
+		act.sa_flags |= SA_INTERRUPT;	/* SunOS 4.x */
+#endif
+	} else {
+#ifdef SA_RESTART
+		act.sa_flags |= SA_RESTART;	/* SVR4, 4.4BSD */
+#endif
+	}
+
+	if (sigaction(signo, &act, &oact) < 0)
+		return SIG_ERR;
+
+	return oact.sa_handler;
+}