diff options
Diffstat (limited to 'libc/libio/freopen.c')
-rw-r--r-- | libc/libio/freopen.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/libc/libio/freopen.c b/libc/libio/freopen.c new file mode 100644 index 000000000..d94a5629f --- /dev/null +++ b/libc/libio/freopen.c @@ -0,0 +1,88 @@ +/* Copyright (C) 1993,95,96,97,98,2000,2001,2002,2003 + Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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. + + 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. + + 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 <stdlib.h> + +#include <shlib-compat.h> +#include <fd_to_filename.h> + +FILE* +freopen (filename, mode, fp) + const char* filename; + const char* mode; + FILE* fp; +{ + FILE *result; + int fd = -1; + CHECK_FILE (fp, NULL); + if (!(fp->_flags & _IO_IS_FILEBUF)) + return NULL; + _IO_acquire_lock (fp); + if (filename == NULL && _IO_fileno (fp) >= 0) + { + fd = __dup (_IO_fileno (fp)); + if (fd != -1) + filename = fd_to_filename (fd); + } +#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) + if (&_IO_stdin_used == NULL) + { + /* If the shared C library is used by the application binary which + was linked against the older version of libio, we just use the + older one even for internal use to avoid trouble since a pointer + to the old libio may be passed into shared C library and wind + up here. */ + _IO_old_file_close_it (fp); + _IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_old_file_jumps; + result = _IO_old_file_fopen (fp, filename, mode); + } + else +#endif + { + INTUSE(_IO_file_close_it) (fp); + _IO_JUMPS ((struct _IO_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 = INTUSE(_IO_file_fopen) (fp, filename, mode, 1); + 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); + } + _IO_release_lock (fp); + return result; +} |