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