Make fwrite return 0 on EOF

1 files changed, 66 insertions, 0 deletions

diff --git a/libio/tst-fwrite-error.c b/libio/tst-fwrite-error.c
new file mode 100644
index 0000000000..3c0cf49c3a
--- /dev/null
+++ b/libio/tst-fwrite-error.c
@@ -0,0 +1,66 @@
+/* Test of fwrite() function, adapted from gnulib-tests in grep.
+   Copyright (C) 2011-2012 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, 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 <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+
+static int
+do_test (void)
+{
+  char tmpl[] = "/tmp/tst-fwrite-error.XXXXXX";
+  int fd = mkstemp (tmpl);
+  if (fd == -1)
+    {
+      printf ("mkstemp failed with errno %d\n", errno);
+      return 1;
+    }
+  FILE *fp = fdopen (fd, "w");
+  if (fp == NULL)
+    {
+      printf ("fdopen failed with errno %d\n", errno);
+      return 1;
+    }
+
+  char buf[5] = "world";
+  setvbuf (fp, NULL, _IONBF, 0);
+  close (fd);
+  unlink (tmpl);
+  errno = 0;
+
+  int ret = fwrite (buf, 1, sizeof (buf), fp);
+  if (ret != 0)
+    {
+      printf ("fwrite returned %d\n", ret);
+      return 1;
+    }
+  if (errno != EBADF)
+    {
+      printf ("Errno is not EBADF: %d\n", errno);
+      return 1;
+    }
+  if (ferror (fp) == 0)
+    {
+      printf ("ferror not set\n");
+      return 1;
+    }
+
+  return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"