fflush.c revision 72373
11573Srgrimes/*- 21573Srgrimes * Copyright (c) 1990, 1993 31573Srgrimes * The Regents of the University of California. All rights reserved. 41573Srgrimes * 51573Srgrimes * This code is derived from software contributed to Berkeley by 61573Srgrimes * Chris Torek. 71573Srgrimes * 81573Srgrimes * Redistribution and use in source and binary forms, with or without 91573Srgrimes * modification, are permitted provided that the following conditions 101573Srgrimes * are met: 111573Srgrimes * 1. Redistributions of source code must retain the above copyright 121573Srgrimes * notice, this list of conditions and the following disclaimer. 131573Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141573Srgrimes * notice, this list of conditions and the following disclaimer in the 151573Srgrimes * documentation and/or other materials provided with the distribution. 161573Srgrimes * 3. All advertising materials mentioning features or use of this software 171573Srgrimes * must display the following acknowledgement: 181573Srgrimes * This product includes software developed by the University of 191573Srgrimes * California, Berkeley and its contributors. 201573Srgrimes * 4. Neither the name of the University nor the names of its contributors 211573Srgrimes * may be used to endorse or promote products derived from this software 221573Srgrimes * without specific prior written permission. 231573Srgrimes * 241573Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251573Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261573Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271573Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281573Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291573Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301573Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311573Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321573Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331573Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341573Srgrimes * SUCH DAMAGE. 351573Srgrimes */ 361573Srgrimes 371573Srgrimes#if defined(LIBC_SCCS) && !defined(lint) 3816586Sjraynard#if 0 391573Srgrimesstatic char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93"; 4016586Sjraynard#endif 4116586Sjraynardstatic const char rcsid[] = 4250476Speter "$FreeBSD: head/lib/libc/stdio/fflush.c 72373 2001-02-11 22:06:43Z deischen $"; 431573Srgrimes#endif /* LIBC_SCCS and not lint */ 441573Srgrimes 4571579Sdeischen#include "namespace.h" 461573Srgrimes#include <errno.h> 471573Srgrimes#include <stdio.h> 4871579Sdeischen#include "un-namespace.h" 4971579Sdeischen#include "libc_private.h" 501573Srgrimes#include "local.h" 511573Srgrimes 5272373Sdeischenstatic int sflush_locked(FILE *); 5372373Sdeischen 5471579Sdeischen/* 5571579Sdeischen * Flush a single file, or (if fp is NULL) all files. 5671579Sdeischen * MT-safe version 5771579Sdeischen */ 5813545Sjulianint 5971579Sdeischenfflush(FILE *fp) 601573Srgrimes{ 6113545Sjulian int retval; 621573Srgrimes 631573Srgrimes if (fp == NULL) 6472373Sdeischen return (_fwalk(sflush_locked)); 6535129Sjb FLOCKFILE(fp); 661573Srgrimes if ((fp->_flags & (__SWR | __SRW)) == 0) { 671573Srgrimes errno = EBADF; 6813545Sjulian retval = EOF; 6971579Sdeischen } else 7013545Sjulian retval = __sflush(fp); 7135129Sjb FUNLOCKFILE(fp); 7213545Sjulian return (retval); 731573Srgrimes} 741573Srgrimes 7571579Sdeischen/* 7671579Sdeischen * Flush a single file, or (if fp is NULL) all files. 7771579Sdeischen * Non-MT-safe version 7871579Sdeischen */ 7913545Sjulianint 8071579Sdeischen__fflush(FILE *fp) 811573Srgrimes{ 8271579Sdeischen int retval; 831573Srgrimes 8471579Sdeischen if (fp == NULL) 8572373Sdeischen return (_fwalk(sflush_locked)); 8671579Sdeischen if ((fp->_flags & (__SWR | __SRW)) == 0) { 8771579Sdeischen errno = EBADF; 8871579Sdeischen retval = EOF; 8971579Sdeischen } else 9071579Sdeischen retval = __sflush(fp); 9171579Sdeischen return (retval); 9271579Sdeischen} 9371579Sdeischen 9471579Sdeischenint 9571579Sdeischen__sflush(FILE *fp) 9671579Sdeischen{ 9771579Sdeischen unsigned char *p; 9871579Sdeischen int n, t; 9971579Sdeischen 1001573Srgrimes t = fp->_flags; 1011573Srgrimes if ((t & __SWR) == 0) 1021573Srgrimes return (0); 1031573Srgrimes 1041573Srgrimes if ((p = fp->_bf._base) == NULL) 1051573Srgrimes return (0); 1061573Srgrimes 1071573Srgrimes n = fp->_p - p; /* write this much */ 1081573Srgrimes 1091573Srgrimes /* 1101573Srgrimes * Set these immediately to avoid problems with longjmp and to allow 1111573Srgrimes * exchange buffering (via setvbuf) in user write function. 1121573Srgrimes */ 1131573Srgrimes fp->_p = p; 1141573Srgrimes fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; 1151573Srgrimes 1161573Srgrimes for (; n > 0; n -= t, p += t) { 1171573Srgrimes t = (*fp->_write)(fp->_cookie, (char *)p, n); 1181573Srgrimes if (t <= 0) { 1191573Srgrimes fp->_flags |= __SERR; 1201573Srgrimes return (EOF); 1211573Srgrimes } 1221573Srgrimes } 1231573Srgrimes return (0); 1241573Srgrimes} 12572373Sdeischen 12672373Sdeischenstatic int 12772373Sdeischensflush_locked(FILE *fp) 12872373Sdeischen{ 12972373Sdeischen int ret; 13072373Sdeischen 13172373Sdeischen FLOCKFILE(fp); 13272373Sdeischen ret = __sflush(fp); 13372373Sdeischen FUNLOCKFILE(fp); 13472373Sdeischen return (ret); 13572373Sdeischen} 136