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77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
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/* Definitions of global stdio data structures.
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Copyright (C) 1991, 1993 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <unistd.h>
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/* This file defines all the global internal variables for stdio. */
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/* Standard streams. */
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#define READ 1, 0
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#define WRITE 0, 1
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#define BUFFERED 0
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#define UNBUFFERED 1
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#define stdstream(name, next, fd, readwrite, unbuffered) \
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{ \
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_IOMAGIC, \
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NULL, NULL, NULL, NULL, 0, \
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(PTR) fd, \
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{ readwrite, /* ... */ }, \
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{ NULL, NULL, NULL, NULL, NULL }, \
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{ NULL, NULL }, \
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-1, -1, \
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(next), \
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NULL, '\0', 0, \
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0, 0, unbuffered, 0, 0, 0, 0 \
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}
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static FILE stdstreams[3] =
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{
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stdstream (&stdstreams[0], &stdstreams[1], STDIN_FILENO, READ, BUFFERED),
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stdstream (&stdstreams[1], &stdstreams[2], STDOUT_FILENO, WRITE, BUFFERED),
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stdstream (&stdstreams[2], NULL, STDERR_FILENO, WRITE, UNBUFFERED),
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};
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FILE *stdin = &stdstreams[0];
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FILE *stdout = &stdstreams[1];
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FILE *stderr = &stdstreams[2];
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/* Pointer to the first stream in the list. */
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FILE *__stdio_head = &stdstreams[0];
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/* This function MUST be in this file!
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This is because we want _cleanup to go into the __libc_atexit set
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when any stdio code is used (and to use any stdio code, one must reference
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something defined in this file), and since only local symbols can be made
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set elements, having the set element stab entry here and _cleanup elsewhere
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loses; and having them both elsewhere loses because there is no reference
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to cause _cleanup to be linked in. */
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void
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DEFUN_VOID(_cleanup)
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{
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(void) fclose((FILE *) NULL);
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}
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#ifdef HAVE_GNU_LD
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text_set_element(__libc_atexit, _cleanup);
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#endif
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