X-Git-Url: https://mattmccutchen.net/rsync/rsync.git/blobdiff_plain/8ef4ffd6987bb566c268d2a353d5fea1cfd9e430..0473e2a14a57169f3b129329956c14d8f60dc7cd:/util.c

diff --git a/util.c b/util.c
index 67308cd2..7d15a8a6 100644
--- a/util.c
+++ b/util.c
@@ -482,3 +482,25 @@ int name_to_gid(char *name, gid_t *gid)
 	return 0;
 }
 
+
+/****************************************************************************
+check if a process exists. 
+****************************************************************************/
+int process_exists(int pid)
+{
+	return(kill(pid,0) == 0 || errno != ESRCH);
+}
+
+/* lock a byte range in a open file */
+int lock_range(int fd, int offset, int len)
+{
+	struct flock lock;
+
+	lock.l_type = F_WRLCK;
+	lock.l_whence = SEEK_SET;
+	lock.l_start = offset;
+	lock.l_len = len;
+	lock.l_pid = 0;
+	
+	return fcntl(fd,F_SETLK,&lock) == 0;
+}