maint: update copyright

[gnulib.git] / tests / test-flock.c

diff --git a/tests/test-flock.c b/tests/test-flock.c
index a1872cd..b123222 100644 (file)
--- a/tests/test-flock.c
+++ b/tests/test-flock.c
@@ -1,9 +1,9 @@
 /* Test of flock() function.
-   Copyright (C) 2008 Free Software Foundation, Inc.
+   Copyright (C) 2008-2014 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
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -14,25 +14,18 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
+#include <config.h>
 
 #include <sys/file.h>
 
-#define ASSERT(expr) \
-  do                                                                   \
-    {                                                                  \
-      if (!(expr))                                                     \
-        {                                                              \
-         fprintf (stderr, "%s:%d: assertion failed, errno = %d\n",     \
-                  __FILE__, __LINE__, errno);                          \
-          fflush (stderr);                                             \
-          abort ();                                                    \
-        }                                                              \
-    }                                                                  \
-  while (0)
+#include "signature.h"
+SIGNATURE_CHECK (flock, int, (int, int));
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "macros.h"
 
 static void
 test_shared (const char *file, int fd)
@@ -48,7 +41,7 @@ test_shared (const char *file, int fd)
   ASSERT (fd2 >= 0);
 
   r = flock (fd2, LOCK_SH | LOCK_NB);
-  ASSERT (r == 0);             /* Was able to acquire a second shared lock. */
+  ASSERT (r == 0);              /* Was able to acquire a second shared lock. */
 
   ASSERT (flock (fd, LOCK_UN) == 0);
   ASSERT (close (fd2) == 0);
@@ -65,8 +58,30 @@ test_exclusive (const char *file, int fd)
   fd2 = open (file, O_RDWR, 0644);
   ASSERT (fd2 >= 0);
 
+  r = flock (fd2, LOCK_EX | LOCK_NB);
+  ASSERT (r == -1);             /* Was unable to acquire a second exclusive lock. */
+
+#if 0
+  /* The Linux manual page of flock(2) says:
+       "A process may only hold one type of lock (shared or exclusive) on a
+       file. Subsequent flock() calls on an already locked file will convert
+       an existing lock to the new lock mode."
+     So, the call below should convert the exclusive lock for fd to a shared
+     and thus succeeds.  The fact that it doesn't but instead fails is
+     apparently a bug.  */
+  /* The Solaris manual page of flock(2) says:
+       "More than one process may hold a shared lock for a file at any given
+        time, but multiple exclusive, or both shared and exclusive, locks may
+        not exist simultaneously on a file. ...
+        Requesting a lock on an object that is already locked normally causes
+        the caller to block until the lock may be acquired. If LOCK_NB is
+        included in operation, then this will not happen; instead, the call
+        will fail and the error EWOULDBLOCK will be returned."
+     So, the call below should fail and set errno to EWOULDBLOCK.  The fact
+     that it succeeds is apparently a bug.  */
   r = flock (fd2, LOCK_SH | LOCK_NB);
-  ASSERT (r == -1);            /* Was unable to acquire a second exclusive lock. */
+  ASSERT (r == -1);
+#endif
 
   ASSERT (flock (fd, LOCK_UN) == 0);
   ASSERT (close (fd2) == 0);
@@ -83,7 +98,9 @@ main (int argc, char *argv[])
   ASSERT (fd >= 0);
   ASSERT (write (fd, "hello", 5) == 5);
 
-  /* Some impossible operation codes which should never be accepted. */
+#if defined __linux__
+  /* Invalid operation codes are rejected by the Linux implementation and by
+     the gnulib replacement,  but not by the Mac OS X implementation.  */
   ASSERT (flock (fd, LOCK_SH | LOCK_EX) == -1);
   ASSERT (errno == EINVAL);
   ASSERT (flock (fd, LOCK_SH | LOCK_UN) == -1);
@@ -92,6 +109,7 @@ main (int argc, char *argv[])
   ASSERT (errno == EINVAL);
   ASSERT (flock (fd, 0) == -1);
   ASSERT (errno == EINVAL);
+#endif
 
   test_shared (file, fd);
   test_exclusive (file, fd);