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Diffstat (limited to 'sysdeps/posix/defs.c')
-rw-r--r-- | sysdeps/posix/defs.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/posix/defs.c b/sysdeps/posix/defs.c new file mode 100644 index 0000000000..fcbaf16f69 --- /dev/null +++ b/sysdeps/posix/defs.c @@ -0,0 +1,76 @@ +/* Definitions of global stdio data structures. + +Copyright (C) 1991, 1993 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 <stddef.h> +#include <stdio.h> +#include <unistd.h> + +/* This file defines all the global internal variables for stdio. */ + +/* Standard streams. */ +#define READ 1, 0 +#define WRITE 0, 1 +#define BUFFERED 0 +#define UNBUFFERED 1 +#define stdstream(name, next, fd, readwrite, unbuffered) \ + { \ + _IOMAGIC, \ + NULL, NULL, NULL, NULL, 0, \ + (PTR) fd, \ + { readwrite, /* ... */ }, \ + { NULL, NULL, NULL, NULL, NULL }, \ + { NULL, NULL }, \ + -1, -1, \ + (next), \ + NULL, '\0', 0, \ + 0, 0, unbuffered, 0, 0, 0, 0 \ + } +static FILE stdstreams[3] = + { + stdstream (&stdstreams[0], &stdstreams[1], STDIN_FILENO, READ, BUFFERED), + stdstream (&stdstreams[1], &stdstreams[2], STDOUT_FILENO, WRITE, BUFFERED), + stdstream (&stdstreams[2], NULL, STDERR_FILENO, WRITE, UNBUFFERED), + }; +FILE *stdin = &stdstreams[0]; +FILE *stdout = &stdstreams[1]; +FILE *stderr = &stdstreams[2]; + +/* Pointer to the first stream in the list. */ +FILE *__stdio_head = &stdstreams[0]; + +/* 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); +} + + +#ifdef HAVE_GNU_LD +text_set_element(__libc_atexit, _cleanup); +#endif |