1 files changed, 20 insertions, 0 deletions
diff --git a/src/repo/s6rc_repo_lock.c b/src/repo/s6rc_repo_lock.c
new file mode 100644
index 0000000..472ff15
--- /dev/null
+++ b/src/repo/s6rc_repo_lock.c
@@ -0,0 +1,20 @@
+/* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/djbunix.h>
+
+#include <s6-rc/repo.h>
+
+int s6rc_repo_lock (char const *repo, int w)
+{
+  int fd ;
+  size_t repolen = strlen(repo) ;
+  char fn[repolen + 13] ;
+  memcpy(fn, repo, repolen) ;
+  memcpy(fn + repolen, "/lock", 6) ;
+  fd = openc_write(fn) ;
+  if (fd == -1) return -1 ;
+  if (fd_lock(fd, w, 0) < 1) return -1 ;
+  return fd ;
+}