/* * 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 _getchar_unlocked_r (struct _reent *ptr) { return _getc_unlocked_r (ptr, _stdin_r (ptr)); } #ifndef _REENT_ONLY int getchar_unlocked (void) { /* CHECK_INIT is called (eventually) by __srefill_r. */ return _getc_unlocked_r (_REENT, _stdin_r (_REENT)); } #endif