1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2010 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 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 31int sfclrlock(Sfio_t* f) 32#else 33int sfclrlock(f) 34Sfio_t *f; 35#endif 36{ 37 int rv; 38 SFMTXDECL(f); 39 40 /* already closed */ 41 if(f && (f->mode&SF_AVAIL)) 42 return 0; 43 44 SFMTXENTER(f,0); 45 46 /* clear error bits */ 47 f->flags &= ~(SF_ERROR|SF_EOF); 48 49 /* clear peek locks */ 50 if(f->mode&SF_PKRD) 51 { f->here -= f->endb-f->next; 52 f->endb = f->next; 53 } 54 55 SFCLRBITS(f); 56 57 /* throw away all lock bits except for stacking state SF_PUSH */ 58 f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO); 59 60 rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS); 61 62 SFMTXRETURN(f, rv); 63} 64