From 8a6eaed305dbe4ec6a87fe37000f7461bf563937 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Wed, 18 Jun 2025 18:58:34 +0000
Subject:  Add a lot of stuff, implement basic service_start

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libs6f/s6f_lock.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 src/libs6f/s6f_lock.c

(limited to 'src/libs6f/s6f_lock.c')

diff --git a/src/libs6f/s6f_lock.c b/src/libs6f/s6f_lock.c
new file mode 100644
index 0000000..1ef1718
--- /dev/null
+++ b/src/libs6f/s6f_lock.c
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/strerr.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/unix-transactional.h>
+
+#include "s6f.h"
+
+int s6f_lock (char const *stmpdir, int w)
+{
+  int fdstmp = s6f_confdir_open(stmpdir, 1) ;
+  int fd = openc_truncat(fdstmp, "lock") ;
+  if (fd == -1) strerr_diefu4sys(111, "open ", stmpdir, "/lock", " for writing") ;
+  fd_close(fdstmp) ;
+  if (fd_lock(fd, w, 0) < 1)
+    strerr_diefu3sys(111, "lock ", stmpdir, "/lock") ;
+  return fd ;
+}
-- 
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