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86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/* Definitions of global stdio data structures.
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Copyright (C) 1991, 1992, 1993, 1994, 1995 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 <stdio.h>
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#include <hurd/fd.h>
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#include <unistd.h>
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FILE *stdin, *stdout, *stderr;
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/* Pointer to the first stream in the list. */
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FILE *__stdio_head = NULL;
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static void
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init_stdio (void)
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{
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inline void init (FILE **streamptr, int fd)
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{
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/* We want to use the existing FILE object if one has been allocated.
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(This will only be the case if our image came from something like
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Emacs's unexec, where we were called in the first run.) */
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FILE *s = *streamptr ?: __newstream ();
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struct hurd_fd *d = _hurd_fd_get (fd);
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if (d == NULL)
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{
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/* There is no file descriptor allocated. We want the standard
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streams to always refer to their standard file descriptors, even
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if those descriptors are not set up until later. So allocate
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the descriptor structure with no ports and store it in the
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stream. Operations will fail until ports are installed in the
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file descriptor. */
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if (d = _hurd_alloc_fd (NULL, fd))
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__spin_unlock (&d->port.lock);
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}
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if (s)
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s->__cookie = d;
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*streamptr = s;
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}
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#define S(NAME, FD, MODE) \
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init (&NAME, FD); if (NAME) NAME->__mode.__##MODE = 1;
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S (stdin, STDIN_FILENO, read);
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S (stdout, STDOUT_FILENO, write);
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S (stderr, STDERR_FILENO, write);
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#undef S
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if (stderr)
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stderr->__userbuf = 1; /* stderr is always unbuffered. */
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(void) &init_stdio; /* Avoid "defined but not used" warning. */
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}
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text_set_element (_hurd_fd_subinit, init_stdio);
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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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text_set_element (__libc_atexit, _cleanup);
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