[PATCH] [BZ #12724] libio: revert partial POSIX 2008 fclose support

[Mike Frysinger <vapier at gentoo dot org>]

In BZ #12724, partial support for POSIX 2008 fclose behavior was added.
Since it isn't entirely conforming to the spec, some applications are
known to be breaking in this intermediate state.  So revert the partial
support until we can get things fully implemented.

This reverts commit fcabc0f8b185f9e0a9289720be5ede6c39b3bf21.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

2012-12-01  Mike Frysinger  <vapier@gentoo.org>

	* libio/fileops.c (_IO_new_file_close_it): Do not always flush
	when currently writing and seek to current position when not.
	* libio/Makefile (tests): Remove bug-fclose1.
	* libio/bug-fclose1.c: Delete.
---
 libio/Makefile      |   2 +-
 libio/bug-fclose1.c | 132 ----------------------------------------------------
 libio/fileops.c     |  14 ++----
 3 files changed, 4 insertions(+), 144 deletions(-)
 delete mode 100644 libio/bug-fclose1.c

diff --git a/libio/Makefile b/libio/Makefile
index 83d90d0..379d5f7 100644
--- a/libio/Makefile
+++ b/libio/Makefile
@@ -59,7 +59,7 @@ tests = tst_swprintf tst_wprintf tst_swscanf tst_wscanf tst_getwc tst_putwc   \
 	tst-memstream1 tst-memstream2 \
 	tst-wmemstream1 tst-wmemstream2 \
 	bug-memstream1 bug-wmemstream1 \
-	tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos bug-fclose1 tst-fseek \
+	tst-setvbuf1 tst-popen1 tst-fgetwc bug-wsetpos tst-fseek \
 	tst-fwrite-error
 ifeq (yes,$(build-shared))
 # Add test-fopenloc only if shared library is enabled since it depends on
diff --git a/libio/bug-fclose1.c b/libio/bug-fclose1.c
deleted file mode 100644
index f1e09f5..0000000
--- a/libio/bug-fclose1.c
+++ /dev/null
@@ -1,132 +0,0 @@
-// BZ #12724
-
-static void do_prepare (void);
-#define PREPARE(argc, argv) do_prepare ()
-static int do_test (void);
-#define TEST_FUNCTION do_test()
-#include "../test-skeleton.c"
-
-
-static int fd;
-
-
-static void
-do_prepare (void)
-{
-  fd = create_temp_file ("bug-fclose1.", NULL);
-  if (fd == -1)
-    {
-      printf ("cannot create temporary file: %m\n");
-      exit (1);
-    }
-}
-
-
-static int
-do_test (void)
-{
-  static const char pattern[] = "hello world";
-
-  /* Prepare a seekable file.  */
-  if (write (fd, pattern, sizeof pattern) != sizeof pattern)
-    {
-      printf ("cannot write pattern: %m\n");
-      return 1;
-    }
-  if (lseek (fd, 1, SEEK_SET) != 1)
-    {
-      printf ("cannot seek after write: %m\n");
-      return 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.  */
-  int fd2 = dup (fd);
-  if (fd2 < 0)
-    {
-      printf ("cannot duplicate descriptor for writing: %m\n");
-      return 1;
-    }
-  FILE *f = fdopen (fd2, "w");
-  if (f == NULL)
-    {
-      printf ("first fdopen failed: %m\n");
-      return 1;
-    }
-  if (fputc (pattern[1], f) != pattern[1])
-    {
-      printf ("fputc failed: %m\n");
-      return 1;
-    }
-  if (fclose (f) != 0)
-    {
-      printf ("first fclose failed: %m\n");
-      return 1;
-    }
-  errno = 0;
-  if (lseek (fd2, 0, SEEK_CUR) != -1)
-    {
-      printf ("lseek after fclose after write did not fail\n");
-      return 1;
-    }
-  if (errno != EBADF)
-    {
-      printf ("lseek after fclose after write did not fail with EBADF: %m\n");
-      return 1;
-    }
-  off_t o = lseek (fd, 0, SEEK_CUR);
-  if (o != 2)
-    {
-      printf ("\
-lseek on original descriptor after first fclose returned %ld, expected 2\n",
-	      (long int) o);
-      return 1;
-    }
-
-  /* Likewise for an input stream.  */
-  fd2 = dup (fd);
-  if (fd2 < 0)
-     {
-      printf ("cannot duplicate descriptor for reading: %m\n");
-      return 1;
-    }
-  f = fdopen (fd2, "r");
-   if (f == NULL)
-    {
-      printf ("second fdopen failed: %m\n");
-      return 1;
-    }
-   char c = fgetc (f);
-   if (c != pattern[2])
-     {
-       printf ("getc returned %c, expected %c\n", c, pattern[2]);
-       return 1;
-     }
-  if (fclose (f) != 0)
-    {
-      printf ("second fclose failed: %m\n");
-      return 1;
-    }
-  errno = 0;
-  if (lseek (fd2, 0, SEEK_CUR) != -1)
-    {
-      printf ("lseek after fclose after read did not fail\n");
-      return 1;
-    }
-  if (errno != EBADF)
-    {
-      printf ("lseek after fclose after read did not fail with EBADF: %m\n");
-      return 1;
-    }
-  o = lseek (fd, 0, SEEK_CUR);
-  if (o != 3)
-    {
-      printf ("\
-lseek on original descriptor after second fclose returned %ld, expected 3\n",
-	      (long int) o);
-      return 1;
-    }
-
-  return 0;
-}
diff --git a/libio/fileops.c b/libio/fileops.c
index fb6ac17..09d689d 100644
--- a/libio/fileops.c
+++ b/libio/fileops.c
@@ -155,21 +155,13 @@ int
 _IO_new_file_close_it (fp)
      _IO_FILE *fp;
 {
+  int write_status;
   if (!_IO_file_is_open (fp))
     return EOF;
 
-  int write_status;
-  if (_IO_in_put_mode (fp))
+  if ((fp->_flags & _IO_NO_WRITES) == 0
+      && (fp->_flags & _IO_CURRENTLY_PUTTING) != 0)
     write_status = _IO_do_flush (fp);
-  else if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL
-	   && !_IO_in_backup (fp))
-    {
-      off64_t o = _IO_SEEKOFF (fp, 0, _IO_seek_cur, 0);
-      if (o == WEOF)
-	write_status = EOF;
-      else
-	write_status = _IO_SYSSEEK (fp, o, SEEK_SET) < 0 ? EOF : 0;
-    }
   else
     write_status = 0;
 
-- 
1.7.12.4