main: moved daemonize() to daemon.c

1 files changed, 86 insertions, 0 deletions

diff --git a/src/daemon.c b/src/daemon.c
new file mode 100644
index 00000000..09cd5721
--- /dev/null
+++ b/src/daemon.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2003-2008 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * 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 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "daemon.h"
+#include "conf.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+void
+daemonize(Options *options)
+{
+#ifndef WIN32
+	FILE *fp = NULL;
+	ConfigParam *pidFileParam = parseConfigFilePath(CONF_PID_FILE, 0);
+
+	if (pidFileParam) {
+		/* do this before daemon'izing so we can fail gracefully if we can't
+		 * write to the pid file */
+		g_debug("opening pid file");
+		fp = fopen(pidFileParam->value, "w+");
+		if (!fp) {
+			g_error("could not open %s \"%s\" (at line %i) for writing: %s",
+				CONF_PID_FILE, pidFileParam->value,
+				pidFileParam->line, strerror(errno));
+		}
+	}
+
+	if (options->daemon) {
+		int pid;
+
+		fflush(NULL);
+		pid = fork();
+		if (pid > 0)
+			_exit(EXIT_SUCCESS);
+		else if (pid < 0) {
+			g_error("problems fork'ing for daemon!");
+		}
+
+		if (chdir("/") < 0) {
+			g_error("problems changing to root directory");
+		}
+
+		if (setsid() < 0) {
+			g_error("problems setsid'ing");
+		}
+
+		fflush(NULL);
+		pid = fork();
+		if (pid > 0)
+			_exit(EXIT_SUCCESS);
+		else if (pid < 0) {
+			g_error("problems fork'ing for daemon!");
+		}
+
+		g_debug("daemonized!");
+	}
+
+	if (pidFileParam) {
+		g_debug("writing pid file");
+		fprintf(fp, "%lu\n", (unsigned long)getpid());
+		fclose(fp);
+	}
+#else
+	/* no daemonization on WIN32 */
+	(void)options;
+#endif
+}