Update.

* posix/Makefile (tests): Add tst-preadwrite.
	* posix/tst-preadwrite.c: New file.

ChangeLog

@@ -1,5 +1,8 @@
 1998-10-19  Ulrich Drepper  <drepper@cygnus.com>
 
+	* posix/Makefile (tests): Add tst-preadwrite.
+	* posix/tst-preadwrite.c: New file.
+
 	* sysdeps/unix/opendir.c (__opendir): Add back fstat call to make
 	sure that descriptor is in any case for a directory.
 

posix/Makefile

@@ -55,7 +55,8 @@ routines :=								      \
 include ../Makeconfig
 
 aux		:= init-posix environ
-tests		:= tstgetopt testfnm runtests wordexp-test runptests
+tests		:= tstgetopt testfnm runtests wordexp-test runptests	     \
+		   tst-preadwrite
 test-srcs	:= globtest
 others		:= getconf
 install-bin	:= getconf

posix/tst-preadwrite.c

@@ -0,0 +1,91 @@
+/* Tests for pread and pwrite.
+   Copyright (C) 1998 Free Software Foundation, Inc.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
+
+   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 <string.h>
+#include <unistd.h>
+
+
+/* Prototype for our test function.  */
+extern void do_prepare (int argc, char *argv[]);
+extern int do_test (int argc, char *argv[]);
+
+/* We have a preparation function.  */
+#define PREPARE do_prepare
+
+/* We might need a bit longer timeout.  */
+#define TIMEOUT 20 /* sec */
+
+/* This defines the `main' function and some more.  */
+#include <test-skeleton.c>
+
+/* These are for the temporary file we generate.  */
+char *name;
+int fd;
+
+void
+do_prepare (int argc, char *argv[])
+{
+   char name_len;
+
+     name_len = strlen (test_dir);
+     name = malloc (name_len + sizeof ("/preadwriteXXXXXX"));
+     mempcpy (mempcpy (name, test_dir, name_len),
+	      "/preadwriteXXXXXX", sizeof ("/preadwriteXXXXXX"));
+     add_temp_file (name);
+
+     /* Open our test file.   */
+     fd = mkstemp (name);
+     if (fd == -1)
+       error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
+}
+
+
+int
+do_test (int argc, char *argv[])
+{
+  char buf[1000];
+  char res[1000];
+  int i;
+
+  memset (buf, '\0', sizeof (buf));
+  memset (res, '\xff', sizeof (res));
+
+  if (write (fd, buf, sizeof (buf)) != sizeof (buf))
+    error (EXIT_FAILURE, errno, "during write");
+
+  for (i = 100; i < 200; ++i)
+    buf[i] = i;
+  if (pwrite (fd, buf + 100, 100, 100) != 100)
+    error (EXIT_FAILURE, errno, "during pwrite");
+
+  for (i = 450; i < 600; ++i)
+    buf[i] = i;
+  if (pwrite (fd, buf + 450, 150, 450) != 150)
+    error (EXIT_FAILURE, errno, "during pwrite");
+
+  if (pread (fd, res, sizeof (buf) - 50, 50) != sizeof (buf) - 50)
+    error (EXIT_FAILURE, errno, "during pread");
+
+  close (fd);
+  unlink (name);
+
+  return memcmp (buf + 50, res, sizeof (buf) - 50);
+}