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[glibc/history.git] / libio / freopen.c
blobd80815f91828d9d4acefe4a9602c0560eac74bfc
1 /* Copyright (C) 1993,95,96,97,98,2000,2001,2002,2003,2008
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA.
20 As a special exception, if you link the code in this file with
21 files compiled with a GNU compiler to produce an executable,
22 that does not cause the resulting executable to be covered by
23 the GNU Lesser General Public License. This exception does not
24 however invalidate any other reasons why the executable file
25 might be covered by the GNU Lesser General Public License.
26 This exception applies to code released by its copyright holders
27 in files containing the exception. */
29 #include "libioP.h"
30 #include "stdio.h"
31 #include <stdlib.h>
33 #include <shlib-compat.h>
34 #include <fd_to_filename.h>
36 FILE*
37 freopen (filename, mode, fp)
38 const char* filename;
39 const char* mode;
40 FILE* fp;
42 FILE *result;
43 int fd = -1;
44 CHECK_FILE (fp, NULL);
45 if (!(fp->_flags & _IO_IS_FILEBUF))
46 return NULL;
47 _IO_acquire_lock (fp);
48 if (filename == NULL && _IO_fileno (fp) >= 0)
50 fd = __dup (_IO_fileno (fp));
51 if (fd != -1)
52 filename = fd_to_filename (fd);
54 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
55 if (&_IO_stdin_used == NULL)
57 /* If the shared C library is used by the application binary which
58 was linked against the older version of libio, we just use the
59 older one even for internal use to avoid trouble since a pointer
60 to the old libio may be passed into shared C library and wind
61 up here. */
62 _IO_old_file_close_it (fp);
63 _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_old_file_jumps;
64 result = _IO_old_file_fopen (fp, filename, mode);
66 else
67 #endif
69 INTUSE(_IO_file_close_it) (fp);
70 _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps;
71 if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL)
72 fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
73 result = INTUSE(_IO_file_fopen) (fp, filename, mode, 1);
74 if (result != NULL)
75 result = __fopen_maybe_mmap (result);
77 if (result != NULL)
78 /* unbound stream orientation */
79 result->_mode = 0;
80 if (fd != -1)
82 __close (fd);
83 free ((char *) filename);
85 _IO_release_lock (fp);
86 return result;