diff options
Diffstat (limited to 'usr/src/lib/libast/common/sfio/sfset.c')
| -rw-r--r-- | usr/src/lib/libast/common/sfio/sfset.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/sfio/sfset.c b/usr/src/lib/libast/common/sfio/sfset.c new file mode 100644 index 0000000000..2618ba60b4 --- /dev/null +++ b/usr/src/lib/libast/common/sfio/sfset.c @@ -0,0 +1,88 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#include "sfhdr.h" + +/* Set some control flags or file descript for the stream +** +** Written by Kiem-Phong Vo. +*/ + +#if __STD_C +int sfset(reg Sfio_t* f, reg int flags, reg int set) +#else +int sfset(f,flags,set) +reg Sfio_t* f; +reg int flags; +reg int set; +#endif +{ + reg int oflags; + + SFMTXSTART(f,0); + + if(flags == 0 && set == 0) + SFMTXRETURN(f, (f->flags&SF_FLAGS)); + + if((oflags = (f->mode&SF_RDWR)) != (int)f->mode && _sfmode(f,oflags,0) < 0) + SFMTXRETURN(f, 0); + + if(flags == 0) + SFMTXRETURN(f, (f->flags&SF_FLAGS)); + + SFLOCK(f,0); + + /* preserve at least one rd/wr flag */ + oflags = f->flags; + if(!(f->bits&SF_BOTH) || (flags&SF_RDWR) == SF_RDWR ) + flags &= ~SF_RDWR; + + /* set the flag */ + if(set) + f->flags |= (flags&SF_SETS); + else f->flags &= ~(flags&SF_SETS); + + /* must have at least one of read/write */ + if(!(f->flags&SF_RDWR)) + f->flags |= (oflags&SF_RDWR); + + if(f->extent < 0) + f->flags &= ~SF_APPENDWR; + + /* turn to appropriate mode as necessary */ + if((flags &= SF_RDWR) ) + { if(!set) + { if(flags == SF_READ) + flags = SF_WRITE; + else flags = SF_READ; + } + if((flags == SF_WRITE && !(f->mode&SF_WRITE)) || + (flags == SF_READ && !(f->mode&(SF_READ|SF_SYNCED))) ) + (void)_sfmode(f,flags,1); + } + + /* if not shared or unseekable, public means nothing */ + if(!(f->flags&SF_SHARE) || f->extent < 0) + f->flags &= ~SF_PUBLIC; + + SFOPEN(f,0); + SFMTXRETURN(f, (oflags&SF_FLAGS)); +} |