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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Copyright (C) 1993-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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#include "stdio.h"
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fd_to_filename.h>
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#include <kernel-features.h>
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FILE *
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freopen64 (filename, mode, fp)
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const char* filename;
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const char* mode;
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FILE *fp;
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{
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FILE *result;
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CHECK_FILE (fp, NULL);
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if (!(fp->_flags & _IO_IS_FILEBUF))
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return NULL;
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_IO_acquire_lock (fp);
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int fd = _IO_fileno (fp);
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const char *gfilename = (filename == NULL && fd >= 0
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? fd_to_filename (fd) : filename);
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fp->_flags2 |= _IO_FLAGS2_NOCLOSE;
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_IO_file_close_it (fp);
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_IO_JUMPS ((struct _IO_FILE_plus *) fp) = &_IO_file_jumps;
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if (_IO_vtable_offset (fp) == 0 && fp->_wide_data != NULL)
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fp->_wide_data->_wide_vtable = &_IO_wfile_jumps;
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result = _IO_file_fopen (fp, gfilename, mode, 0);
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fp->_flags2 &= ~_IO_FLAGS2_NOCLOSE;
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if (result != NULL)
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result = __fopen_maybe_mmap (result);
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if (result != NULL)
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{
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/* unbound stream orientation */
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result->_mode = 0;
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if (fd != -1)
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{
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#ifdef O_CLOEXEC
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# ifndef __ASSUME_DUP3
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int newfd;
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if (__have_dup3 < 0)
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newfd = -1;
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else
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newfd =
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# endif
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__dup3 (_IO_fileno (result), fd,
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(result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0
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? O_CLOEXEC : 0);
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#else
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# define newfd 1
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#endif
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#ifndef __ASSUME_DUP3
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if (newfd < 0)
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{
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if (errno == ENOSYS)
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__have_dup3 = -1;
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__dup2 (_IO_fileno (result), fd);
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if ((result->_flags2 & _IO_FLAGS2_CLOEXEC) != 0)
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__fcntl (fd, F_SETFD, FD_CLOEXEC);
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}
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#endif
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__close (_IO_fileno (result));
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_IO_fileno (result) = fd;
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}
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}
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else if (fd != -1)
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__close (fd);
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if (filename == NULL)
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free ((char *) gfilename);
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_IO_release_lock (fp);
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return result;
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}
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