14887Schin /*********************************************************************** 24887Schin * * 34887Schin * This software is part of the ast package * 4*8462SApril.Chin@Sun.COM * Copyright (c) 1985-2008 AT&T Intellectual Property * 54887Schin * and is licensed under the * 64887Schin * Common Public License, Version 1.0 * 7*8462SApril.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 /* Set some control flags or file descript for the stream 254887Schin ** 264887Schin ** Written by Kiem-Phong Vo. 274887Schin */ 284887Schin 294887Schin #if __STD_C 30*8462SApril.Chin@Sun.COM int sfset(Sfio_t* f, int flags, int set) 314887Schin #else 324887Schin int sfset(f,flags,set) 33*8462SApril.Chin@Sun.COM Sfio_t* f; 34*8462SApril.Chin@Sun.COM int flags; 35*8462SApril.Chin@Sun.COM int set; 364887Schin #endif 374887Schin { 384887Schin reg int oflags; 39*8462SApril.Chin@Sun.COM SFMTXDECL(f); 404887Schin 41*8462SApril.Chin@Sun.COM SFMTXENTER(f,0); 424887Schin 434887Schin if(flags == 0 && set == 0) 444887Schin SFMTXRETURN(f, (f->flags&SF_FLAGS)); 454887Schin 464887Schin if((oflags = (f->mode&SF_RDWR)) != (int)f->mode && _sfmode(f,oflags,0) < 0) 474887Schin SFMTXRETURN(f, 0); 484887Schin 494887Schin if(flags == 0) 504887Schin SFMTXRETURN(f, (f->flags&SF_FLAGS)); 514887Schin 524887Schin SFLOCK(f,0); 534887Schin 544887Schin /* preserve at least one rd/wr flag */ 554887Schin oflags = f->flags; 564887Schin if(!(f->bits&SF_BOTH) || (flags&SF_RDWR) == SF_RDWR ) 574887Schin flags &= ~SF_RDWR; 584887Schin 594887Schin /* set the flag */ 604887Schin if(set) 614887Schin f->flags |= (flags&SF_SETS); 624887Schin else f->flags &= ~(flags&SF_SETS); 634887Schin 644887Schin /* must have at least one of read/write */ 654887Schin if(!(f->flags&SF_RDWR)) 664887Schin f->flags |= (oflags&SF_RDWR); 674887Schin 684887Schin if(f->extent < 0) 694887Schin f->flags &= ~SF_APPENDWR; 704887Schin 714887Schin /* turn to appropriate mode as necessary */ 724887Schin if((flags &= SF_RDWR) ) 734887Schin { if(!set) 744887Schin { if(flags == SF_READ) 754887Schin flags = SF_WRITE; 764887Schin else flags = SF_READ; 774887Schin } 784887Schin if((flags == SF_WRITE && !(f->mode&SF_WRITE)) || 794887Schin (flags == SF_READ && !(f->mode&(SF_READ|SF_SYNCED))) ) 804887Schin (void)_sfmode(f,flags,1); 814887Schin } 824887Schin 834887Schin /* if not shared or unseekable, public means nothing */ 844887Schin if(!(f->flags&SF_SHARE) || f->extent < 0) 854887Schin f->flags &= ~SF_PUBLIC; 864887Schin 874887Schin SFOPEN(f,0); 884887Schin SFMTXRETURN(f, (oflags&SF_FLAGS)); 894887Schin } 90