90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
|
/*
|
||
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms are permitted
|
||
|
|
* provided that the above copyright notice and this paragraph are
|
||
|
|
* duplicated in all such forms and that any documentation,
|
||
|
|
* advertising materials, and other materials related to such
|
||
|
|
* distribution and use acknowledge that the software was developed
|
||
|
|
* by the University of California, Berkeley. The name of the
|
||
|
|
* University may not be used to endorse or promote products derived
|
||
|
|
* from this software without specific prior written permission.
|
||
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
||
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
||
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
FUNCTION
|
||
|
|
<<getchar_unlocked>>---non-thread-safe version of getchar (macro)
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
getchar_unlocked
|
||
|
|
INDEX
|
||
|
|
_getchar_unlocked_r
|
||
|
|
|
||
|
|
SYNOPSIS
|
||
|
|
#include <stdio.h>
|
||
|
|
int getchar_unlocked(void);
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
int _getchar_unlocked_r(struct _reent *<[ptr]>);
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
<<getchar_unlocked>> is a non-thread-safe version of <<getchar>>
|
||
|
|
declared in <<stdio.h>>. <<getchar_unlocked>> may only safely be used
|
||
|
|
within a scope protected by flockfile() (or ftrylockfile()) and
|
||
|
|
funlockfile(). These functions may safely be used in a multi-threaded
|
||
|
|
program if and only if they are called while the invoking thread owns
|
||
|
|
the ( FILE *) object, as is the case after a successful call to the
|
||
|
|
flockfile() or ftrylockfile() functions. If threads are disabled,
|
||
|
|
then <<getchar_unlocked>> is equivalent to <<getchar>>.
|
||
|
|
|
||
|
|
The <<_getchar_unlocked_r>> function is simply the reentrant version of
|
||
|
|
<<getchar_unlocked>> which passes an addtional reentrancy structure pointer
|
||
|
|
argument: <[ptr]>.
|
||
|
|
|
||
|
|
RETURNS
|
||
|
|
See <<getchar>>.
|
||
|
|
|
||
|
|
PORTABILITY
|
||
|
|
POSIX 1003.1 requires <<getchar_unlocked>>. <<getchar_unlocked>> may
|
||
|
|
be implemented as a macro.
|
||
|
|
|
||
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
||
|
|
<<lseek>>, <<read>>, <<sbrk>>, <<write>>. */
|
||
|
|
|
||
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
||
|
|
static char sccsid[] = "%W% (Berkeley) %G%";
|
||
|
|
#endif /* LIBC_SCCS and not lint */
|
||
|
|
|
||
|
|
/*
|
||
|
|
* A subroutine version of the macro getchar_unlocked.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <_ansi.h>
|
||
|
|
#include <reent.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#undef getchar_unlocked
|
||
|
|
|
||
|
|
int
|
||
|
|
_DEFUN(_getchar_unlocked_r, (ptr),
|
||
|
|
struct _reent *ptr)
|
||
|
|
{
|
||
|
|
return _getc_unlocked_r (ptr, _stdin_r (ptr));
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef _REENT_ONLY
|
||
|
|
|
||
|
|
int
|
||
|
|
_DEFUN_VOID(getchar_unlocked)
|
||
|
|
{
|
||
|
|
/* CHECK_INIT is called (eventually) by __srefill_r. */
|
||
|
|
|
||
|
|
return _getc_unlocked_r (_REENT, _stdin_r (_REENT));
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|