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[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libc/] [stdio/] [getc_u.c] - Rev 853
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/* * 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 _DEFUN(_getc_unlocked_r, (ptr, fp), struct _reent *ptr _AND register FILE *fp) { /* CHECK_INIT is called (eventually) by __srefill_r. */ return __sgetc_r (ptr, fp); } #ifndef _REENT_ONLY int _DEFUN(getc_unlocked, (fp), register FILE *fp) { return __sgetc_r (_REENT, fp); } #endif /* !_REENT_ONLY */
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