1 files changed, 97 insertions, 0 deletions
diff --git a/io/tst-fcntl-lock.c b/io/tst-fcntl-lock.c
new file mode 100644
index 0000000000..357c4b7b56
--- /dev/null
+++ b/io/tst-fcntl-lock.c
@@ -0,0 +1,97 @@
+/* Test for advisory record locking.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <fcntl.h>
+#include <errno.h>
+#include <unistd.h>
+
+/* This is essentially the POSIX lockf.  */
+
+static int
+fcntl_lockf (int fd, int cmd, off_t len)
+{
+  struct flock fl = {
+    .l_type = F_WRLCK,
+    .l_whence = SEEK_CUR,
+    .l_len = len
+  };
+
+  switch (cmd)
+    {
+    case F_TEST:
+      fl.l_type = F_RDLCK;
+      if (fcntl (fd, F_GETLK, &fl) < 0)
+	return -1;
+      if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
+	return 0;
+      errno = EACCES;
+      return -1;
+
+    case F_ULOCK:
+      fl.l_type = F_UNLCK;
+      return fcntl (fd, F_SETLK, &fl);
+
+    case F_LOCK:
+      return fcntl (fd, F_SETLKW, &fl);
+
+    case F_TLOCK:
+      return fcntl (fd, F_SETLK, &fl);
+    }
+
+  errno = EINVAL;
+  return -1;
+}
+
+static int
+fcntl64_lockf (int fd, int cmd, off64_t len64)
+  {
+  struct flock64 fl64 = {
+    .l_type = F_WRLCK,
+    .l_whence = SEEK_CUR,
+    .l_len = len64
+  };
+
+  switch (cmd)
+    {
+    case F_TEST:
+      fl64.l_type = F_RDLCK;
+      if (fcntl64 (fd, F_GETLK64, &fl64) < 0)
+	return -1;
+      if (fl64.l_type == F_UNLCK || fl64.l_pid == getpid ())
+	return 0;
+      errno = EACCES;
+      return -1;
+
+    case F_ULOCK:
+      fl64.l_type = F_UNLCK;
+      return fcntl64 (fd, F_SETLK64, &fl64);
+
+    case F_LOCK:
+      return fcntl64 (fd, F_SETLKW64, &fl64);
+
+    case F_TLOCK:
+      return fcntl64 (fd, F_SETLK64, &fl64);
+    }
+
+  errno = EINVAL;
+  return -1;
+}
+
+#define TST_LOCKFD  "tst-fcntl-lock."
+#define LOCKF       fcntl_lockf
+#define LOCKF64     fcntl64_lockf
+#include "tst-lockf.c"