14887Schin /*********************************************************************** 24887Schin * * 34887Schin * This software is part of the ast package * 4*12068SRoger.Faulkner@Oracle.COM * Copyright (c) 1985-2010 AT&T Intellectual Property * 54887Schin * and is licensed under the * 64887Schin * Common Public License, Version 1.0 * 78462SApril.Chin@Sun.COM * by AT&T Intellectual Property * 84887Schin * * 94887Schin * A copy of the License is available at * 104887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 124887Schin * * 134887Schin * Information and Software Systems Research * 144887Schin * AT&T Research * 154887Schin * Florham Park NJ * 164887Schin * * 174887Schin * Glenn Fowler <gsf@research.att.com> * 184887Schin * David Korn <dgk@research.att.com> * 194887Schin * Phong Vo <kpv@research.att.com> * 204887Schin * * 214887Schin ***********************************************************************/ 224887Schin #include "sfhdr.h" 234887Schin 244887Schin /* Function to clear a locked stream. 254887Schin ** This is useful for programs that longjmp from the mid of an sfio function. 264887Schin ** There is no guarantee on data integrity in such a case. 274887Schin ** 284887Schin ** Written by Kiem-Phong Vo 294887Schin */ 304887Schin #if __STD_C sfclrlock(Sfio_t * f)318462SApril.Chin@Sun.COMint sfclrlock(Sfio_t* f) 324887Schin #else 334887Schin int sfclrlock(f) 348462SApril.Chin@Sun.COM Sfio_t *f; 354887Schin #endif 364887Schin { 374887Schin int rv; 388462SApril.Chin@Sun.COM SFMTXDECL(f); 394887Schin 404887Schin /* already closed */ 414887Schin if(f && (f->mode&SF_AVAIL)) 424887Schin return 0; 434887Schin 448462SApril.Chin@Sun.COM SFMTXENTER(f,0); 454887Schin 464887Schin /* clear error bits */ 474887Schin f->flags &= ~(SF_ERROR|SF_EOF); 484887Schin 494887Schin /* clear peek locks */ 504887Schin if(f->mode&SF_PKRD) 514887Schin { f->here -= f->endb-f->next; 524887Schin f->endb = f->next; 534887Schin } 544887Schin 554887Schin SFCLRBITS(f); 564887Schin 574887Schin /* throw away all lock bits except for stacking state SF_PUSH */ 584887Schin f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO); 594887Schin 604887Schin rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS); 614887Schin 624887Schin SFMTXRETURN(f, rv); 634887Schin } 64