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[thirdparty/glibc.git] / libio / freopen64.c

diff --git a/libio/freopen64.c b/libio/freopen64.c
index fb19ed9029a394240fa24b9f4e4e630bcd3e00f2..3c596894c3cbaeeae354536e87c2d9bf7b3c24e9 100644 (file)
--- a/libio/freopen64.c
+++ b/libio/freopen64.c
@@ -1,68 +1,95 @@
-/* Copyright (C) 1993,1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
-   This file is part of the GNU IO Library.
+/* Copyright (C) 1993-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
 
-   This library 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 2, or (at
-   your option) any later version.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
 
-   This library is distributed in the hope that it will be useful, but
-   WITHOUT ANY WARRANTY; without even the implied warranty of
+   The GNU C Library 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.
+   Lesser General Public License for more details.
 
-   You should have received a copy of the GNU General Public License
-   along with this library; see the file COPYING.  If not, write to
-   the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
-   MA 02111-1307, USA.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.
 
-   As a special exception, if you link this library with files
-   compiled with a GNU compiler to produce an executable, this does
-   not cause the resulting executable to be covered by the GNU General
-   Public License.  This exception does not however invalidate any
-   other reasons why the executable file might be covered by the GNU
-   General Public License.  */
+   As a special exception, if you link the code in this file with
+   files compiled with a GNU compiler to produce an executable,
+   that does not cause the resulting executable to be covered by
+   the GNU Lesser General Public License.  This exception does not
+   however invalidate any other reasons why the executable file
+   might be covered by the GNU Lesser General Public License.
+   This exception applies to code released by its copyright holders
+   in files containing the exception.  */
 
-#include "libioP.h"
-#include "stdio.h"
+#include <stdio.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
 
+#include <libioP.h>
 #include <fd_to_filename.h>
 
 FILE *
-freopen64 (filename, mode, fp)
-     const char* filename;
-     const char* mode;
-     FILE *fp;
+freopen64 (const char *filename, const char *mode, FILE *fp)
 {
-#ifdef _G_OPEN64
-  FILE *result;
-  int fd = -1;
+  FILE *result = NULL;
+  char fdfilename[FD_TO_FILENAME_SIZE];
+
   CHECK_FILE (fp, NULL);
+
+  _IO_acquire_lock (fp);
+  /* First flush the stream (failure should be ignored).  */
+  _IO_SYNC (fp);
+
   if (!(fp->_flags & _IO_IS_FILEBUF))
-    return NULL;
-  _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp);
-  _IO_flockfile (fp);
-  if (filename == NULL && _IO_fileno (fp) >= 0)
-    {
-      fd = dup (_IO_fileno (fp));
-      if (fd != -1)
-       filename = fd_to_filename (fd);
-    }
-  result = _IO_freopen64 (filename, mode, fp);
+    goto end;
+
+  int fd = _IO_fileno (fp);
+  const char *gfilename
+    = filename != NULL ? filename : fd_to_filename (fd, fdfilename);
+
+  fp->_flags2 |= _IO_FLAGS2_NOCLOSE;
+  _IO_file_close_it (fp);
+  _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps;
+  if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL)
+    fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
+  result = _IO_file_fopen (fp, gfilename, mode, 0);
+  fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE;
+  if (result != NULL)
+    result = __fopen_maybe_mmap (result);
   if (result != NULL)
-    /* unbound stream orientation */
-    result->_mode = 0;
-  if (fd != -1)
     {
-      close (fd);
-      if (filename != NULL)
-       free ((char *) filename);
+      /* unbound stream orientation */
+      result->_mode = 0;
+
+      if (fd != -1 && _IO_fileno (result) != fd)
+       {
+         /* At this point we have both file descriptors already allocated,
+            so __dup3 will not fail with EBADF, EINVAL, or EMFILE.  But
+            we still need to check for EINVAL and, due Linux internal
+            implementation, EBUSY.  It is because on how it internally opens
+            the file by splitting the buffer allocation operation and VFS
+            opening (a dup operation may run when a file is still pending
+            'install' on VFS).  */
+         if (__dup3 (_IO_fileno (result), fd,
+                     (result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0
+                     ? O_CLOEXEC : 0) == -1)
+           {
+             _IO_file_close_it (result);
+             result = NULL;
+             goto end;
+           }
+         __close (_IO_fileno (result));
+         _IO_fileno (result) = fd;
+       }
     }
-  _IO_funlockfile (fp);
-  _IO_cleanup_region_end (0);
+  else if (fd != -1)
+    __close (fd);
+
+end:
+  _IO_release_lock (fp);
   return result;
-#else
-  __set_errno (ENOSYS);
-  return NULL;
-#endif
 }