1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #include "sfhdr.h" 23 24 /* Function to clear a locked stream. 25 ** This is useful for programs that longjmp from the mid of an sfio function. 26 ** There is no guarantee on data integrity in such a case. 27 ** 28 ** Written by Kiem-Phong Vo 29 */ 30 #if __STD_C 31 int sfclrlock(reg Sfio_t* f) 32 #else 33 int sfclrlock(f) 34 reg Sfio_t *f; 35 #endif 36 { 37 int rv; 38 39 /* already closed */ 40 if(f && (f->mode&SF_AVAIL)) 41 return 0; 42 43 SFMTXSTART(f,0); 44 45 /* clear error bits */ 46 f->flags &= ~(SF_ERROR|SF_EOF); 47 48 /* clear peek locks */ 49 if(f->mode&SF_PKRD) 50 { f->here -= f->endb-f->next; 51 f->endb = f->next; 52 } 53 54 SFCLRBITS(f); 55 56 /* throw away all lock bits except for stacking state SF_PUSH */ 57 f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO); 58 59 rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS); 60 61 SFMTXRETURN(f, rv); 62 } 63