1 files changed, 88 insertions, 0 deletions
diff --git a/source3/lib/pidfile.c b/source3/lib/pidfile.c
new file mode 100644
index 0000000000..8dee7421de
--- /dev/null
+++ b/source3/lib/pidfile.c
@@ -0,0 +1,88 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 1.9.
+   pidfile handling
+   Copyright (C) Andrew Tridgell 1998
+   
+   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+
+extern int DEBUGLEVEL;
+
+#ifndef O_NONBLOCK
+#define O_NONBLOCK
+#endif
+
+
+/* create a pid file in the lock directory. open it and leave it locked */
+void pidfile_create(char *name)
+{
+	int     fd;
+	char    buf[20];
+	pstring pidFile;
+
+	sprintf(pidFile, "%s/%s.pid", lp_lockdir(), name);
+
+	fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_TRUNC, 0644);
+	if (fd < 0) {
+		DEBUG(0,("ERROR: can't open %s: %s\n", pidFile, 
+			 strerror(errno)));
+		exit(1);
+	}
+
+	if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==False) {
+		DEBUG(0,("ERROR: %s is already running\n", name));
+		exit(1);
+	}
+
+	sprintf(buf, "%u\n", (unsigned int) getpid());
+	if (write(fd, buf, strlen(buf)) < 0) {
+		DEBUG(0,("ERROR: can't write to %s: %s\n", 
+			 pidFile, strerror(errno)));
+		exit(1);
+	}
+	/* Leave pid file open & locked for the duration... */
+}
+
+
+/* return the pid in a pidfile. return 0 if the process (or pidfile)
+   does not exist */
+int pidfile_pid(char *name)
+{
+	FILE *f;
+	pstring pidFile;
+	unsigned ret;
+
+	sprintf(pidFile, "%s/%s.pid", lp_lockdir(), name);
+
+	f = fopen(pidFile, "r");
+	if (!f) {
+		return 0;
+	}
+
+	if (fscanf(f,"%u", &ret) != 1) {
+		fclose(f);
+		return 0;
+	}
+	fclose(f);
+	
+	if (!process_exists(ret)) return 0;
+
+	return ret;
+}
+