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- /* Definitions of global stdio data structures.
-
- Copyright (C) 1991, 1992, 1993, 1994 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <stdio.h>
- #include <hurd/fd.h>
- #include <gnu-stabs.h>
- #include <unistd.h>
-
- FILE *stdin, *stdout, *stderr;
-
- /* Pointer to the first stream in the list. */
- FILE *__stdio_head = NULL;
-
- static void
- init_stdio (void)
- {
- inline void init (FILE **streamptr, int fd)
- {
- /* We want to use the existing FILE object if one has been allocated.
- (This will only be the case if our image came from something like
- Emacs's unexec, where we were called in the first run.) */
- FILE *s = *streamptr ?: __newstream ();
- struct hurd_fd *d = _hurd_fd_get (fd);
- if (d == NULL)
- /* There is no file descriptor allocated. We want the standard
- streams to always refer to their standard file descriptors, even
- if those descriptors are not set up until later. So allocate
- the descriptor structure with no ports and store it in the
- stream. Operations will fail until ports are installed in the
- file descriptor. */
- d = _hurd_alloc_fd (NULL, fd);
- if (d)
- __spin_unlock (&d->port.lock);
- if (s)
- s->__cookie = d;
- *streamptr = s;
- }
- #define S(NAME, FD, MODE) \
- init (&NAME, FD); if (NAME) NAME->__mode.__##MODE = 1;
-
- S (stdin, STDIN_FILENO, read);
- S (stdout, STDOUT_FILENO, write);
- S (stderr, STDERR_FILENO, write);
-
- #undef S
-
- if (stderr)
- stderr->__userbuf = 1; /* stderr is always unbuffered. */
-
- (void) &init_stdio; /* Avoid "defined but not used" warning. */
- }
- text_set_element (_hurd_fd_subinit, init_stdio);
-
- /* This function MUST be in this file!
- This is because we want _cleanup to go into the __libc_atexit set
- when any stdio code is used (and to use any stdio code, one must reference
- something defined in this file), and since only local symbols can be made
- set elements, having the set element stab entry here and _cleanup elsewhere
- loses; and having them both elsewhere loses because there is no reference
- to cause _cleanup to be linked in. */
-
- void
- DEFUN_VOID(_cleanup)
- {
- (void) fclose ((FILE *) NULL);
- }
- text_set_element (__libc_atexit, _cleanup);
-