X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/851dbdb775e409cf9f55e51bd8e07139d2f8930b..0c515f17c44344813e8949fbb684b357ad70cfdf:/util.c

diff --git a/util.c b/util.c
index 346d58af..bcbd8c1b 100644
--- a/util.c
+++ b/util.c
@@ -483,3 +483,20 @@ int name_to_gid(char *name, gid_t *gid)
 }
 
 
+/****************************************************************************
+check if a process exists. 
+****************************************************************************/
+int process_exists(int pid)
+{
+	return(kill(pid,0) == 0 || errno != ESRCH);
+}
+
+int lock_file(int fd)
+{
+	return flock(fd, LOCK_EX) == 0;
+}
+
+int unlock_file(int fd)
+{
+	return flock(fd, LOCK_UN) == 0;
+}