1 files changed, 69 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/f_setlk.c b/sysdeps/mach/hurd/f_setlk.c
new file mode 100644
index 0000000000..718af67e32
--- /dev/null
+++ b/sysdeps/mach/hurd/f_setlk.c
@@ -0,0 +1,69 @@
+/* f_setlk -- locking part of fcntl
+   Copyright (C) 2014-2015 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/* XXX
+   We need new RPCs to support POSIX.1 fcntl file locking!!
+   For the time being we support the whole-file case only,
+   with all kinds of WRONG WRONG WRONG semantics,
+   by using flock.  This is definitely the Wrong Thing,
+   but it might be better than nothing (?).  */
+int
+__f_setlk (int fd, int type, int whence, __off64_t start, __off64_t len, int wait)
+{
+  int cmd = 0;
+
+  switch (type)
+    {
+    case F_RDLCK: cmd = LOCK_SH; break;
+    case F_WRLCK: cmd = LOCK_EX; break;
+    case F_UNLCK: cmd = LOCK_UN; break;
+    default:
+      errno = EINVAL;
+      return -1;
+    }
+
+  if (cmd != LOCK_UN && wait == 0)
+    cmd |= LOCK_NB;
+
+  switch (whence)
+    {
+    case SEEK_SET:
+      if (start == 0 && len == 0) /* Whole file request.  */
+	break;
+      /* It seems to be common for applications to lock the first
+	 byte of the file when they are really doing whole-file locking.
+	 So, since it's so wrong already, might as well do that too.  */
+      if (start == 0 && len == 1)
+	break;
+      /* FALLTHROUGH */
+    case SEEK_CUR:
+    case SEEK_END:
+      errno = ENOTSUP;
+      return -1;
+    default:
+      errno = EINVAL;
+      return -1;
+    }
+
+  return __flock (fd, cmd);
+}