libfshelp-tests: Tests for file record locking

2019-03-04  Svante Signell <svante.signell@gmail.com>

        * test-*.c: Update code, remove test results.
        * README.new_tests: New file, summarize new test results.

2019-02-12  Svante Signell <svante.signell@gmail.com>

        * test-*.c: Update code, add some test results.
        * Makefile: Remove extra flags.

2019-02-01  Svante Signell <svante.signell@gmail.com>

        * Update copyright years.

2016-05-23  Svante Signell <svante.signell@gmail.com>

        * Makefile: Add sub-directory libfshelp-tests.

2018-12-07  Svante Signell <svante.signell@gmail.com>

        * Update copyright years.
        * locks.c(cmd_lock): Call fshelp_rlock_tweak()
          with new last argument rendezvous = MACH_PORT_NULL.

2017-01-05  Svante Signell <svante.signell@gmail.com>

        * Update copyright years and headers.

2016-12-28  Svante Signell <svante.signell@gmail.com>

        * Makefile: test-flock.c, test-lockf.c and test-fcntl.c
        * test-lockf.c: New file
        * Rename set-flock.c, set-fcntl.c to test-flock.c test-fcntl.c
        * TODO: Update README

2016-05-23  Svante Signell <svante.signell@gmail.com>

        * Makefile: Link with pthread, add build of set-flock.c and set-fcntl.c
        * define temporary CPP_FLAGS until glibc is updated
        * set-flock.c, set-fcntl.c: New files.
        * Fix typos in README

2001-04-11  Neal H Walfield  <neal@cs.uml.edu>

        * ChangeLog: New file, mentioning itself in this sentence.
        * Makefile: New file.
        * README: Likewise.
        * fork.c: Likewise.
        * locks: Likewise.
        * locks-tests: Likewise.
        * locks.c: Likewise.
        * race.c: Likewise.

1 files changed, 83 insertions, 0 deletions

diff --git a/libfshelp-tests/race.c b/libfshelp-tests/race.c
new file mode 100644
index 00000000..a1d398ab
--- /dev/null
+++ b/libfshelp-tests/race.c
@@ -0,0 +1,83 @@
+/* Test races in the record locking code.
+
+   Copyright (C) 2001 Free Software Foundation, Inc.
+
+   Written by Neal H Walfield <neal@cs.uml.edu>
+
+   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, 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 the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include <stdio.h>
+#include <error.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include "fs_U.h"
+#include <hurd.h>
+#include "io_U.h"
+
+int main (int argc, char **argv)
+{
+  error_t err;
+  struct flock64 lock;
+  mach_port_t rendezvous = MACH_PORT_NULL;
+  int fd;
+  int i;
+  uint v;
+  int blocked = 0;
+  char buf[10] = "";
+  char *bufp;
+
+  if (argc != 4)
+    error (1, 0, "Usage: %s file start len", argv[0]);
+
+  lock.l_whence = SEEK_SET;
+  lock.l_start = atoi (argv[2]);
+  lock.l_len = atoi (argv[3]);
+
+  fd = file_name_lookup (argv[1], O_READ | O_WRITE | O_CREAT, 0666);
+  if (fd == MACH_PORT_NULL)
+    error (1, errno, "file_name_lookup");
+
+  for (i = 0; i < 10000; i ++)
+    {
+      lock.l_type = F_WRLCK;
+      err = file_record_lock (fd, F_SETLK64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND);
+      if (err)
+        {
+	  blocked ++;
+          err = file_record_lock (fd, F_SETLKW64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND);
+	}
+      if (err)
+        error (1, err, "file_record_lock");
+
+      v = sizeof (buf);
+      bufp = buf;
+      io_read (fd, &bufp, &v, 0, v);
+
+      v = atoi (bufp);
+      sprintf (buf, "%d\n", v + 1);
+
+      v = 10;
+      io_write (fd, buf, sizeof (buf), 0, &v);
+      if (v == 0)
+        error (1, errno, "write (%d)", i);
+
+      lock.l_type = F_UNLCK;
+      file_record_lock (fd, F_SETLK64, &lock, rendezvous, MACH_MSG_TYPE_MAKE_SEND);
+    }
+
+  mach_port_deallocate (mach_task_self (), fd);
+
+  printf ("Was blocked %d times\n", blocked);
+  return 0;
+}