89 lines
2.5 KiB
C
89 lines
2.5 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
|
|
<<getc_unlocked>>---non-thread-safe version of getc (macro)
|
|
|
|
INDEX
|
|
getc_unlocked
|
|
INDEX
|
|
_getc_unlocked_r
|
|
|
|
SYNOPSIS
|
|
#include <stdio.h>
|
|
int getc_unlocked(FILE *<[fp]>);
|
|
|
|
#include <stdio.h>
|
|
int _getc_unlocked_r(FILE *<[fp]>);
|
|
|
|
DESCRIPTION
|
|
<<getc_unlocked>> is a non-thread-safe version of <<getc>> declared in
|
|
<<stdio.h>>. <<getc_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
|
|
<<getc_unlocked>> is equivalent to <<getc>>.
|
|
|
|
The <<_getc_unlocked_r>> function is simply the reentrant version of
|
|
<<get_unlocked>> which passes an additional reentrancy structure pointer
|
|
argument: <[ptr]>.
|
|
|
|
RETURNS
|
|
See <<getc>>.
|
|
|
|
PORTABILITY
|
|
POSIX 1003.1 requires <<getc_unlocked>>. <<getc_unlocked>> may be
|
|
implemented as a macro, so arguments should not have side-effects.
|
|
|
|
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 */
|
|
|
|
#include <_ansi.h>
|
|
#include <stdio.h>
|
|
|
|
/*
|
|
* A subroutine version of the macro getc_unlocked.
|
|
*/
|
|
|
|
#undef getc_unlocked
|
|
|
|
int
|
|
_getc_unlocked_r (struct _reent *ptr,
|
|
register FILE *fp)
|
|
{
|
|
/* CHECK_INIT is called (eventually) by __srefill_r. */
|
|
|
|
return __sgetc_r (ptr, fp);
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
int
|
|
getc_unlocked (register FILE *fp)
|
|
{
|
|
return __sgetc_r (_REENT, fp);
|
|
}
|
|
|
|
#endif /* !_REENT_ONLY */
|