| 1 |
148 |
jeremybenn |
/*
|
| 2 |
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
| 3 |
|
|
* All rights reserved.
|
| 4 |
|
|
*
|
| 5 |
|
|
* Redistribution and use in source and binary forms are permitted
|
| 6 |
|
|
* provided that the above copyright notice and this paragraph are
|
| 7 |
|
|
* duplicated in all such forms and that any documentation,
|
| 8 |
|
|
* advertising materials, and other materials related to such
|
| 9 |
|
|
* distribution and use acknowledge that the software was developed
|
| 10 |
|
|
* by the University of California, Berkeley. The name of the
|
| 11 |
|
|
* University may not be used to endorse or promote products derived
|
| 12 |
|
|
* from this software without specific prior written permission.
|
| 13 |
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
|
| 14 |
|
|
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
|
| 15 |
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
| 16 |
|
|
*/
|
| 17 |
|
|
|
| 18 |
|
|
/*
|
| 19 |
|
|
FUNCTION
|
| 20 |
|
|
<<getc_unlocked>>---non-thread-safe version of getc (macro)
|
| 21 |
|
|
|
| 22 |
|
|
INDEX
|
| 23 |
|
|
getc_unlocked
|
| 24 |
|
|
INDEX
|
| 25 |
|
|
_getc_unlocked_r
|
| 26 |
|
|
|
| 27 |
|
|
SYNOPSIS
|
| 28 |
|
|
#include <stdio.h>
|
| 29 |
|
|
int getc_unlocked(FILE *<[fp]>);
|
| 30 |
|
|
|
| 31 |
|
|
#include <stdio.h>
|
| 32 |
|
|
int _getc_unlocked_r(FILE *<[fp]>);
|
| 33 |
|
|
|
| 34 |
|
|
DESCRIPTION
|
| 35 |
|
|
<<getc_unlocked>> is a non-thread-safe version of <<getc>> declared in
|
| 36 |
|
|
<<stdio.h>>. <<getc_unlocked>> may only safely be used within a scope
|
| 37 |
|
|
protected by flockfile() (or ftrylockfile()) and funlockfile(). These
|
| 38 |
|
|
functions may safely be used in a multi-threaded program if and only
|
| 39 |
|
|
if they are called while the invoking thread owns the ( FILE *)
|
| 40 |
|
|
object, as is the case after a successful call to the flockfile() or
|
| 41 |
|
|
ftrylockfile() functions. If threads are disabled, then
|
| 42 |
|
|
<<getc_unlocked>> is equivalent to <<getc>>.
|
| 43 |
|
|
|
| 44 |
|
|
The <<_getc_unlocked_r>> function is simply the reentrant version of
|
| 45 |
|
|
<<get_unlocked>> which passes an additional reentrancy structure pointer
|
| 46 |
|
|
argument: <[ptr]>.
|
| 47 |
|
|
|
| 48 |
|
|
RETURNS
|
| 49 |
|
|
See <<getc>>.
|
| 50 |
|
|
|
| 51 |
|
|
PORTABILITY
|
| 52 |
|
|
POSIX 1003.1 requires <<getc_unlocked>>. <<getc_unlocked>> may be
|
| 53 |
|
|
implemented as a macro, so arguments should not have side-effects.
|
| 54 |
|
|
|
| 55 |
|
|
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
|
| 56 |
|
|
<<lseek>>, <<read>>, <<sbrk>>, <<write>>. */
|
| 57 |
|
|
|
| 58 |
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
| 59 |
|
|
static char sccsid[] = "%W% (Berkeley) %G%";
|
| 60 |
|
|
#endif /* LIBC_SCCS and not lint */
|
| 61 |
|
|
|
| 62 |
|
|
#include <_ansi.h>
|
| 63 |
|
|
#include <stdio.h>
|
| 64 |
|
|
|
| 65 |
|
|
/*
|
| 66 |
|
|
* A subroutine version of the macro getc_unlocked.
|
| 67 |
|
|
*/
|
| 68 |
|
|
|
| 69 |
|
|
#undef getc_unlocked
|
| 70 |
|
|
|
| 71 |
|
|
int
|
| 72 |
|
|
_DEFUN(_getc_unlocked_r, (ptr, fp),
|
| 73 |
|
|
struct _reent *ptr _AND
|
| 74 |
|
|
register FILE *fp)
|
| 75 |
|
|
{
|
| 76 |
|
|
/* CHECK_INIT is called (eventually) by __srefill_r. */
|
| 77 |
|
|
|
| 78 |
|
|
return __sgetc_r (ptr, fp);
|
| 79 |
|
|
}
|
| 80 |
|
|
|
| 81 |
|
|
#ifndef _REENT_ONLY
|
| 82 |
|
|
|
| 83 |
|
|
int
|
| 84 |
|
|
_DEFUN(getc_unlocked, (fp),
|
| 85 |
|
|
register FILE *fp)
|
| 86 |
|
|
{
|
| 87 |
|
|
return __sgetc_r (_REENT, fp);
|
| 88 |
|
|
}
|
| 89 |
|
|
|
| 90 |
|
|
#endif /* !_REENT_ONLY */
|
