Update.

* rt/Makefile (tests): Add tst-shm.
	Add rules to generate tst-shm.
	* rt/tst-shm.c: New file.

ChangeLog

@@ -1,5 +1,9 @@
 2000-04-11  Ulrich Drepper  <drepper@redhat.com>
 
+	* rt/Makefile (tests): Add tst-shm.
+	Add rules to generate tst-shm.
+	* rt/tst-shm.c: New file.
+
 	* sysdeps/unix/sysv/linux/shm_open.c (shm_open): Set FD_CLOEXEC
 	for descriptor.
 

rt/Makefile

@@ -39,7 +39,7 @@ include ../Makeconfig
 
 ifeq ($(have-thread-library),yes)
 
-tests := tst-aio tst-aio64 tst-clock
+tests := tst-aio tst-aio64 tst-clock tst-shm
 
 extra-libs := librt
 extra-libs-others := $(extra-libs)
@@ -57,8 +57,10 @@ ifeq (yes,$(build-shared))
 $(objpfx)tst-aio: $(objpfx)librt.so $(shared-thread-library)
 $(objpfx)tst-aio64: $(objpfx)librt.so $(shared-thread-library)
 $(objpfx)tst-clock: $(objpfx)librt.so $(shared-thread-library)
+$(objpfx)tst-shm: $(objpfx)librt.so $(shared-thread-library)
 else
 $(objpfx)tst-aio: $(objpfx)librt.a $(static-thread-library)
 $(objpfx)tst-aio64: $(objpfx)librt.a $(static-thread-library)
 $(objpfx)tst-clock: $(objpfx)librt.a $(static-thread-library)
+$(objpfx)tst-shm: $(objpfx)librt.a $(static-thread-library)
 endif

rt/tst-shm.c

@@ -0,0 +1,199 @@
+/* Test program for POSIX shm_* functions.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+
+/* We want to see output immediately.  */
+#define STDOUT_UNBUFFERED
+
+
+static int
+do_open (void)
+{
+  int fd;
+
+  /* Create the shared memory object.  */
+  fd = shm_open ("/shm-test", O_RDWR, 0600);
+  if (fd == -1)
+    {
+      /* We don't regard this as a bug.  Simply don't run the test.  It could
+	 means there is no such implementation or the object is already in
+	 use in which case we don't want to disturb.  */
+      perror ("failed to open shared memory object: shm_open");
+      return -1;
+    }
+
+  return fd;
+}
+
+
+static void
+worker (int write_now)
+{
+  struct timespec ts;
+  struct stat st;
+  int i;
+  int fd = do_open ();
+  char *mem;
+
+  if (fd == -1)
+    exit (fd);
+
+  if (fstat (fd, &st) == -1 || st.st_size != 4000)
+    error (EXIT_FAILURE, 0, "stat failed");
+
+  mem = mmap (NULL, 4000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+  if (mem == NULL)
+    error (EXIT_FAILURE, 0, "mmap failed");
+
+  ts.tv_sec = 0;
+  ts.tv_nsec = 500000000;
+
+  if (write_now)
+    for (i = 0; i <= 4; ++i)
+      mem[i] = i;
+  else
+    /* Wait until the first bytes of the memory region are 0, 1, 2, 3, 4.  */
+    while (1)
+      {
+	for (i = 0; i <= 4; ++i)
+	  if (mem[i] != i)
+	    break;
+
+	if (i > 4)
+	  /* OK, that's done.  */
+	  break;
+
+	nanosleep (&ts, NULL);
+      }
+
+  if (!write_now)
+    for (i = 0; i <= 4; ++i)
+      mem[i] = 4 + i;
+  else
+    /* Wait until the first bytes of the memory region are 4, 5, 6, 7, 8.  */
+    while (1)
+      {
+	for (i = 0; i <= 4; ++i)
+	  if (mem[i] != 4 + i)
+	    break;
+
+	if (i > 4)
+	  /* OK, that's done.  */
+	  break;
+
+	nanosleep (&ts, NULL);
+      }
+
+  if (munmap (mem, 4000) == -1)
+    error (EXIT_FAILURE, errno, "munmap");
+
+  close (fd);
+
+  exit (0);
+}
+
+
+int
+do_test (void)
+{
+  int fd;
+  pid_t pid1;
+  pid_t pid2;
+  int status1;
+  int status2;
+
+  /* Create the shared memory object.  */
+  fd = shm_open ("/shm-test", O_RDWR | O_CREAT | O_TRUNC | O_EXCL, 0600);
+  if (fd == -1)
+    {
+      /* We don't regard this as a bug.  Simply don't run the test.  It could
+	 means there is no such implementation or the object is already in
+	 use in which case we don't want to disturb.  */
+      perror ("failed to create a shared memory object: shm_open");
+      return 0;
+    }
+
+  /* Size the object.  We make it 4000 bytes long.  */
+  if (ftruncate (fd, 4000) == -1)
+    {
+      /* This failed.  Must be a bug in the implementation of the
+         shared memory itself.  */
+      perror ("failed to size of shared memory object: ftruncate");
+      close (fd);
+      shm_unlink ("/shm-test");
+      return 0;
+    }
+
+  /* Spawn to processes which will do the work.  */
+  pid1 = fork ();
+  if (pid1 == 0)
+    worker (0);
+  else if (pid1 == -1)
+    {
+      /* Couldn't create a second process.  */
+      perror ("fork");
+      close (fd);
+      shm_unlink ("/shm-test");
+      return 0;
+    }
+
+  pid2 = fork ();
+  if (pid2 == 0)
+    worker (1);
+  else if (pid2 == -1)
+    {
+      /* Couldn't create a second process.  */
+      int ignore;
+      perror ("fork");
+      kill (pid1, SIGTERM);
+      waitpid (pid1, &ignore, 0);
+      close (fd);
+      shm_unlink ("/shm-test");
+      return 0;
+    }
+
+  /* Wait until the two processes are finished.  */
+  waitpid (pid1, &status1, 0);
+  waitpid (pid2, &status2, 0);
+
+  /* Now we can unlink the shared object.  */
+  shm_unlink ("/shm-test");
+
+  return (!WIFEXITED (status1) || WEXITSTATUS (status1) != 0
+	  || !WIFEXITED (status2) || WEXITSTATUS (status2) != 0);
+}
+#define TEST_FUNCTION do_test ()
+
+#define CLEANUP_HANDLER shm_unlink ("/shm-test");
+
+
+#include "../test-skeleton.c"