--- libaitio/src/aitio.c	2011/06/07 11:49:39	1.6
+++ libaitio/src/aitio.c	2011/10/31 13:53:51	1.7
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@elwix.org>
 *
 * $Author: misho $
-* $Id: aitio.c,v 1.6 2011/06/07 11:49:39 misho Exp $
+* $Id: aitio.c,v 1.7 2011/10/31 13:53:51 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -557,4 +557,30 @@ ioWatchDirLoop(const char *csDir, int (*callback)(cons
 	close(d);
 	close(kq);
 	return n;
+}
+
+/*
+ * ioCreatePIDFile() Create PID file
+ * @csName = PID filename
+ * @ifExists = !=0 if filename exists return error
+ * return: -1 error or 0 ok
+ */
+inline int
+ioCreatePIDFile(const char *csName, int ifExists)
+{
+	int fd;
+	char str[STRSIZ] = { 0 };
+
+	if (!csName)
+		return -1;
+
+	fd = open(csName, O_WRONLY | O_CREAT | (ifExists ? O_EXCL : 0), 0644);
+	if (fd == -1) {
+		LOGERR;
+		return -1;
+	}
+	snprintf(str, sizeof str, "%d", getpid());
+	write(fd, str, strlen(str));
+	close(fd);
+	return 0;
 }