1 files changed, 13 insertions, 0 deletions

diff --git a/lock_exnb.c b/lock_exnb.c
new file mode 100644
index 0000000..9ec2b9c
--- /dev/null
+++ b/lock_exnb.c
@@ -0,0 +1,13 @@
+/* Public domain. */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <fcntl.h>
+#include "hasflock.h"
+#include "lock.h"
+
+#ifdef HASFLOCK
+int lock_exnb(int fd) { return flock(fd,LOCK_EX | LOCK_NB); }
+#else
+int lock_exnb(int fd) { return lockf(fd,2,0); }
+#endif