From 3534b428629be185e096be99e3bd5fdfe32d5544 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 18 Sep 2014 18:55:44 +0000
Subject: initial commit with rc for skalibs-2.0.0.0

---
 src/libstddjb/lock_shnb.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/libstddjb/lock_shnb.c

(limited to 'src/libstddjb/lock_shnb.c')

diff --git a/src/libstddjb/lock_shnb.c b/src/libstddjb/lock_shnb.c
new file mode 100644
index 0000000..6a8fd42
--- /dev/null
+++ b/src/libstddjb/lock_shnb.c
@@ -0,0 +1,38 @@
+/* ISC license. */
+
+#include <skalibs/sysdeps.h>
+
+#ifdef SKALIBS_HASFLOCK
+
+#include <skalibs/nonposix.h>
+#include <errno.h>
+#include <sys/file.h>
+#include <skalibs/djbunix.h>
+
+int lock_shnb (int fd)
+{
+  register int r ;
+  do
+    r = flock(fd, LOCK_SH | LOCK_NB) ;
+  while ((r == -1) && (errno == EINTR)) ;
+  return r ;
+}
+
+#else
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <skalibs/djbunix.h>
+
+int lock_shnb (int fd)
+{
+  register int r ;
+  do
+    r = lockf(fd, F_TLOCK, 0) ;
+  while ((r == -1) && (errno == EINTR)) ;
+  if ((r == -1) && (errno == EACCES)) errno = EAGAIN ;
+  return r ;
+}
+
+#endif
-- 
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