# HG changeset patch
# User Bruno Haible <bruno@clisp.org>
# Date 1316549783 -7200
# Node ID 264f4282e7c1b00f2a824197308c9d8f23a4b976
# Parent  bc4a7eb2598fd44030393c7ffd6f8590c20c734a
Tests for module 'read'.

* modules/read-tests: New file.
* tests/test-read.c: New file.

diff --git a/ChangeLog b/ChangeLog
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2011-09-20  Bruno Haible  <bruno@clisp.org>
 
+	Tests for module 'read'.
+	* modules/read-tests: New file.
+	* tests/test-read.c: New file.
+
 	pwrite tests: EBADF tests.
 	* tests/test-pwrite.c (main): Add tests for EBADF.
 
diff --git a/modules/read-tests b/modules/read-tests
new file mode 100644
--- /dev/null
+++ b/modules/read-tests
@@ -0,0 +1,14 @@
+Files:
+tests/test-read.c
+tests/signature.h
+tests/macros.h
+
+Depends-on:
+binary-io
+open
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-read
+check_PROGRAMS += test-read
diff --git a/tests/test-read.c b/tests/test-read.c
new file mode 100644
--- /dev/null
+++ b/tests/test-read.c
@@ -0,0 +1,72 @@
+/* Test the read() function.
+   Copyright (C) 2011 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 3 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 <http://www.gnu.org/licenses/>.  */
+
+#include <config.h>
+
+#include <unistd.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (read, ssize_t, (int, void *, size_t));
+
+#include <errno.h>
+#include <fcntl.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  const char *filename = "test-read.tmp";
+  int fd;
+
+  /* Create a file with a simple contents.  */
+  fd = open (filename, O_CREAT | O_WRONLY, 0600);
+  ASSERT (fd >= 0);
+  ASSERT (write (fd, "Hello World", 11) == 11);
+  ASSERT (close (fd) == 0);
+
+  /* Read from the middle of the file.  */
+  fd = open (filename, O_RDONLY);
+  ASSERT (fd >= 0);
+  ASSERT (lseek (fd, 6, SEEK_SET) == 6);
+  {
+    char buf[10];
+    ssize_t ret = read (fd, buf, 10);
+    ASSERT (ret == 5);
+    ASSERT (memcmp (buf, "World", 5) == 0);
+  }
+  ASSERT (close (fd) == 0);
+
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    char byte;
+    errno = 0;
+    ASSERT (read (-1, &byte, 1) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    char byte;
+    errno = 0;
+    ASSERT (read (99, &byte, 1) == -1);
+    ASSERT (errno == EBADF);
+  }
+
+  /* Clean up.  */
+  unlink (filename);
+
+  return 0;
+}