bootstrap: warn about BSD toolchain snafu

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

diff --git a/tests/test-pwrite.c b/tests/test-pwrite.c
index 073f6a3..c9cb094 100644 (file)
--- a/tests/test-pwrite.c
+++ b/tests/test-pwrite.c
@@ -1,5 +1,5 @@
 /* Test the pwrite function.
-   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2009-2013 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
@@ -24,6 +24,7 @@ SIGNATURE_CHECK (pwrite, ssize_t, (int, const void *, size_t, off_t));
 #include <sys/types.h>
 #include <fcntl.h>
 #include <errno.h>
+#include <string.h>
 
 #include "macros.h"
 
@@ -69,12 +70,27 @@ main (void)
   ASSERT (close (fd) == 0);
 
   {
-    char read_buf[N];
     fd = open (file, O_RDONLY);
     ASSERT (0 <= fd);
     ASSERT (read (fd, buf, N) == N);
     ASSERT (close (fd) == 0);
     ASSERT (strcmp ("W1W3W5W7W9",buf) == 0);
   }
+
+  /* Test behaviour for invalid file descriptors.  */
+  {
+    char byte = 'x';
+    errno = 0;
+    ASSERT (pwrite (-1, &byte, 1, 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+  {
+    char byte = 'x';
+    close (99);
+    errno = 0;
+    ASSERT (pwrite (99, &byte, 1, 0) == -1);
+    ASSERT (errno == EBADF);
+  }
+
   return 0;
 }