From ae09ad0ef5ffa2c24060d86f6769576ce6c66a8b Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@newdream.net>
Date: Wed, 4 Jun 2008 12:58:46 -0700
Subject: [PATCH] mon: use fcntl F_SETLK instead of flock

---
 src/mon/MonitorStore.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/mon/MonitorStore.cc b/src/mon/MonitorStore.cc
index 950e95809410b..8bc16804420e7 100644
--- a/src/mon/MonitorStore.cc
+++ b/src/mon/MonitorStore.cc
@@ -46,7 +46,13 @@ int MonitorStore::mount()
   lock_fd = ::open(t, O_CREAT|O_RDWR, 0600);
   if (lock_fd < 0)
     return -errno;
-  int r = ::flock(lock_fd, LOCK_EX|LOCK_NB);
+  struct flock l;
+  memset(&l, 0, sizeof(l));
+  l.l_type = F_WRLCK;
+  l.l_whence = SEEK_SET;
+  l.l_start = 0;
+  l.l_len = 0;
+  int r = ::fcntl(lock_fd, F_SETLK, &l);
   if (r < 0) {
     derr(0) << "failed to lock " << t << ", is another cmon still running?" << dendl;
     return -errno;
-- 
2.39.5