about summary refs log tree commit diff
path: root/libio/oldiofdopen.c
diff options
context:
space:
mode:
Diffstat (limited to 'libio/oldiofdopen.c')
-rw-r--r--libio/oldiofdopen.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/libio/oldiofdopen.c b/libio/oldiofdopen.c
new file mode 100644
index 0000000000..e9c18d932b
--- /dev/null
+++ b/libio/oldiofdopen.c
@@ -0,0 +1,135 @@
+/* Copyright (C) 1993, 1994, 1997 Free Software Foundation, Inc.
+   This file is part of the GNU IO 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.
+
+   This 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.
+
+   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.
+
+   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.  */
+
+#define _IO_USE_OLD_IO_FILE
+#ifdef __STDC__
+#include <stdlib.h>
+#endif
+#include "libioP.h"
+#include <fcntl.h>
+
+#ifndef _IO_fcntl
+#define _IO_fcntl fcntl
+#endif
+
+_IO_FILE *
+_IO_old_fdopen (fd, mode)
+     int fd;
+     const char *mode;
+{
+  int read_write;
+  int posix_mode = 0;
+  struct locked_FILE
+  {
+    struct _IO_FILE_plus fp;
+#ifdef _IO_MTSAFE_IO
+    _IO_lock_t lock;
+#endif
+  } *new_f;
+  int fd_flags;
+
+  switch (*mode++)
+    {
+    case 'r':
+      read_write = _IO_NO_WRITES;
+      break;
+    case 'w':
+      read_write = _IO_NO_READS;
+      break;
+    case 'a':
+      posix_mode = O_APPEND;
+      read_write = _IO_NO_READS|_IO_IS_APPENDING;
+      break;
+    default:
+      MAYBE_SET_EINVAL;
+      return NULL;
+  }
+  if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
+    read_write &= _IO_IS_APPENDING;
+#ifdef F_GETFL
+  fd_flags = _IO_fcntl (fd, F_GETFL);
+#ifndef O_ACCMODE
+#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
+#endif
+  if (fd_flags == -1
+      || ((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES))
+      || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS)))
+    return NULL;
+
+  /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
+     [System Application Program Interface (API) Amendment 1:
+     Realtime Extensions], Rationale B.8.3.3
+     Open a Stream on a File Descriptor says:
+
+         Although not explicitly required by POSIX.1, a good
+         implementation of append ("a") mode would cause the
+         O_APPEND flag to be set.
+
+     (Historical implementations [such as Solaris2] do a one-time
+     seek in fdopen.)
+
+     However, we do not turn O_APPEND off if the mode is "w" (even
+     though that would seem consistent) because that would be more
+     likely to break historical programs.
+     */
+  if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
+    {
+#ifdef F_SETFL
+      if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
+#endif
+	return NULL;
+    }
+#endif
+
+  new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
+  if (new_f == NULL)
+    return NULL;
+#ifdef _IO_MTSAFE_IO
+  new_f->fp.file._lock = &new_f->lock;
+#endif
+  _IO_init (&new_f->fp.file, 0);
+  _IO_JUMPS (&new_f->fp) = &_IO_old_file_jumps;
+  _IO_old_file_init (&new_f->fp.file);
+#if  !_IO_UNIFIED_JUMPTABLES
+  new_f->fp.vtable = NULL;
+#endif
+  if (_IO_old_file_attach (&new_f->fp.file, fd) == NULL)
+    {
+      _IO_un_link (&new_f->fp.file);
+      free (new_f);
+      return NULL;
+    }
+  new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
+
+  new_f->fp.file._IO_file_flags =
+    _IO_mask_flags (&new_f->fp.file, read_write,
+		    _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
+
+  return (_IO_FILE *) &new_f->fp;
+}
+
+strong_alias (_IO_old_fdopen, __old_fdopen)
+symbol_version (_IO_old_fdopen, _IO_fdopen, GLIBC_2.0);
+symbol_version (__old_fdopen, fdopen, GLIBC_2.0);