1da2e3ebdSchin /*********************************************************************** 2da2e3ebdSchin * * 3da2e3ebdSchin * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2011 AT&T Intellectual Property * 5da2e3ebdSchin * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 77c2fbfb3SApril Chin * by AT&T Intellectual Property * 8da2e3ebdSchin * * 9da2e3ebdSchin * A copy of the License is available at * 10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html * 11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12da2e3ebdSchin * * 13da2e3ebdSchin * Information and Software Systems Research * 14da2e3ebdSchin * AT&T Research * 15da2e3ebdSchin * Florham Park NJ * 16da2e3ebdSchin * * 17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> * 18da2e3ebdSchin * David Korn <dgk@research.att.com> * 19da2e3ebdSchin * Phong Vo <kpv@research.att.com> * 20da2e3ebdSchin * * 21da2e3ebdSchin ***********************************************************************/ 22da2e3ebdSchin #include "sfhdr.h" 23da2e3ebdSchin 24da2e3ebdSchin /* Function to clear a locked stream. 25da2e3ebdSchin ** This is useful for programs that longjmp from the mid of an sfio function. 26da2e3ebdSchin ** There is no guarantee on data integrity in such a case. 27da2e3ebdSchin ** 28da2e3ebdSchin ** Written by Kiem-Phong Vo 29da2e3ebdSchin */ 30da2e3ebdSchin #if __STD_C sfclrlock(Sfio_t * f)317c2fbfb3SApril Chinint sfclrlock(Sfio_t* f) 32da2e3ebdSchin #else 33da2e3ebdSchin int sfclrlock(f) 347c2fbfb3SApril Chin Sfio_t *f; 35da2e3ebdSchin #endif 36da2e3ebdSchin { 37da2e3ebdSchin int rv; 38*b30d1939SAndy Fiddaman SFMTXDECL(f); /* declare a local stream variable for multithreading */ 39da2e3ebdSchin 40da2e3ebdSchin /* already closed */ 41da2e3ebdSchin if(f && (f->mode&SF_AVAIL)) 42da2e3ebdSchin return 0; 43da2e3ebdSchin 447c2fbfb3SApril Chin SFMTXENTER(f,0); 45da2e3ebdSchin 46da2e3ebdSchin /* clear error bits */ 47da2e3ebdSchin f->flags &= ~(SF_ERROR|SF_EOF); 48da2e3ebdSchin 49da2e3ebdSchin /* clear peek locks */ 50da2e3ebdSchin if(f->mode&SF_PKRD) 51da2e3ebdSchin { f->here -= f->endb-f->next; 52da2e3ebdSchin f->endb = f->next; 53da2e3ebdSchin } 54da2e3ebdSchin 55da2e3ebdSchin SFCLRBITS(f); 56da2e3ebdSchin 57da2e3ebdSchin /* throw away all lock bits except for stacking state SF_PUSH */ 58da2e3ebdSchin f->mode &= (SF_RDWR|SF_INIT|SF_POOL|SF_PUSH|SF_SYNCED|SF_STDIO); 59da2e3ebdSchin 60da2e3ebdSchin rv = (f->mode&SF_PUSH) ? 0 : (f->flags&SF_FLAGS); 61da2e3ebdSchin 62da2e3ebdSchin SFMTXRETURN(f, rv); 63da2e3ebdSchin } 64