1 files changed, 114 insertions, 0 deletions
diff --git a/gnulib-tests/test-fclose.c b/gnulib-tests/test-fclose.c
new file mode 100644
index 0000000..36c2b32
--- /dev/null
+++ b/gnulib-tests/test-fclose.c
@@ -0,0 +1,114 @@
+/* Test of fclose module.
+   Copyright (C) 2011-2020 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 <https://www.gnu.org/licenses/>.  */
+
+/* Written by Eric Blake.  */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (fclose, int, (FILE *));
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "macros.h"
+
+#define BASE "test-fclose.t"
+
+int
+main (int argc, char **argv)
+{
+  const char buf[] = "hello world";
+  int fd;
+  int fd2;
+  FILE *f;
+
+  /* Prepare a seekable file.  */
+  fd = open (BASE, O_RDWR | O_CREAT | O_TRUNC, 0600);
+  ASSERT (0 <= fd);
+  ASSERT (write (fd, buf, sizeof buf) == sizeof buf);
+  ASSERT (lseek (fd, 1, SEEK_SET) == 1);
+
+  /* Create an output stream visiting the file; when it is closed, all
+     other file descriptors visiting the file must see the new file
+     position.  */
+  fd2 = dup (fd);
+  ASSERT (0 <= fd2);
+  f = fdopen (fd2, "w");
+  ASSERT (f);
+  ASSERT (fputc (buf[1], f) == buf[1]);
+  ASSERT (fclose (f) == 0);
+  errno = 0;
+  ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
+  ASSERT (errno == EBADF);
+  ASSERT (lseek (fd, 0, SEEK_CUR) == 2);
+
+  /* Likewise for an input stream.  */
+  fd2 = dup (fd);
+  ASSERT (0 <= fd2);
+  f = fdopen (fd2, "r");
+  ASSERT (f);
+  ASSERT (fgetc (f) == buf[2]);
+  ASSERT (fclose (f) == 0);
+  errno = 0;
+  ASSERT (lseek (fd2, 0, SEEK_CUR) == -1);
+  ASSERT (errno == EBADF);
+  ASSERT (lseek (fd, 0, SEEK_CUR) == 3);
+
+  /* Test that fclose() sets errno if someone else closes the stream
+     fd behind the back of stdio.  */
+  {
+    FILE *fp = fdopen (fd, "w+");
+    ASSERT (fp != NULL);
+    ASSERT (close (fd) == 0);
+    errno = 0;
+    ASSERT (fclose (fp) == EOF);
+    ASSERT (errno == EBADF);
+  }
+
+  /* Test that fclose() sets errno if the stream was constructed with
+     an invalid file descriptor.  */
+  {
+    FILE *fp = fdopen (-1, "r");
+    if (fp != NULL)
+      {
+        errno = 0;
+        ASSERT (fclose (fp) == EOF);
+        ASSERT (errno == EBADF);
+      }
+  }
+  {
+    FILE *fp;
+    close (99);
+    fp = fdopen (99, "r");
+    if (fp != NULL)
+      {
+        errno = 0;
+        ASSERT (fclose (fp) == EOF);
+        ASSERT (errno == EBADF);
+      }
+  }
+
+  /* Clean up.  */
+  ASSERT (remove (BASE) == 0);
+
+  return 0;
+}