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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2011 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* 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"
/* Close a stream. A file stream is synced before closing.
**
** Written by Kiem-Phong Vo
*/
#if __STD_C
int sfclose(Sfio_t* f)
#else
int sfclose(f)
Sfio_t* f;
#endif
{
reg int local, ex, rv;
Void_t* data = NIL(Void_t*);
SFMTXDECL(f); /* declare a local stream variable for multithreading */
SFMTXENTER(f, -1);
GETLOCAL(f,local);
if(!(f->mode&SF_INIT) &&
SFMODE(f,local) != (f->mode&SF_RDWR) &&
SFMODE(f,local) != (f->mode&(SF_READ|SF_SYNCED)) &&
_sfmode(f,SF_SYNCED,local) < 0)
SFMTXRETURN(f,-1);
/* closing a stack of streams */
while(f->push)
{ reg Sfio_t* pop;
if(!(pop = (*_Sfstack)(f,NIL(Sfio_t*))) )
SFMTXRETURN(f,-1);
if(sfclose(pop) < 0)
{ (*_Sfstack)(f,pop);
SFMTXRETURN(f,-1);
}
}
rv = 0;
if(f->disc == _Sfudisc) /* closing the ungetc stream */
f->disc = NIL(Sfdisc_t*);
else if(f->file >= 0) /* sync file pointer */
{ f->bits |= SF_ENDING;
rv = sfsync(f);
}
SFLOCK(f,0);
/* raise discipline exceptions */
if(f->disc && (ex = SFRAISE(f,local ? SF_NEW : SF_CLOSING,NIL(Void_t*))) != 0)
SFMTXRETURN(f,ex);
if(!local && f->pool)
{ /* remove from pool */
if(f->pool == &_Sfpool)
{ reg int n;
POOLMTXLOCK(&_Sfpool);
for(n = 0; n < _Sfpool.n_sf; ++n)
{ if(_Sfpool.sf[n] != f)
continue;
/* found it */
_Sfpool.n_sf -= 1;
for(; n < _Sfpool.n_sf; ++n)
_Sfpool.sf[n] = _Sfpool.sf[n+1];
break;
}
POOLMTXUNLOCK(&_Sfpool);
}
else
{ f->mode &= ~SF_LOCK; /**/ASSERT(_Sfpmove);
if((*_Sfpmove)(f,-1) < 0)
{ SFOPEN(f,0);
SFMTXRETURN(f,-1);
}
f->mode |= SF_LOCK;
}
f->pool = NIL(Sfpool_t*);
}
if(f->data && (!local || (f->flags&SF_STRING) || (f->bits&SF_MMAP) ) )
{ /* free buffer */
#ifdef MAP_TYPE
if(f->bits&SF_MMAP)
SFMUNMAP(f,f->data,f->endb-f->data);
else
#endif
if(f->flags&SF_MALLOC)
data = (Void_t*)f->data;
f->data = NIL(uchar*);
f->size = -1;
}
/* zap the file descriptor */
if(_Sfnotify)
(*_Sfnotify)(f, SF_CLOSING, (void*)((long)f->file));
if(f->file >= 0 && !(f->flags&SF_STRING))
{ while(sysclosef(f->file) < 0 )
{ if(errno == EINTR)
errno = 0;
else
{ rv = -1;
break;
}
}
}
f->file = -1;
SFKILL(f);
f->flags &= SF_STATIC;
f->here = 0;
f->extent = -1;
f->endb = f->endr = f->endw = f->next = f->data;
/* zap any associated auxiliary buffer */
if(f->rsrv)
{ free(f->rsrv);
f->rsrv = NIL(Sfrsrv_t*);
}
/* delete any associated sfpopen-data */
if(f->proc && _sfpclose(f) < 0 )
rv = -1;
/* destroy the mutex */
if(f->mutex)
{ (void)vtmtxclrlock(f->mutex);
if(f != sfstdin && f != sfstdout && f != sfstderr)
{ (void)vtmtxclose(f->mutex);
f->mutex = NIL(Vtmutex_t*);
}
}
if(!local)
{ if(f->disc && (ex = SFRAISE(f,SF_FINAL,NIL(Void_t*))) != 0 )
{ rv = ex;
goto done;
}
if(!(f->flags&SF_STATIC) )
free(f);
else
{ f->disc = NIL(Sfdisc_t*);
f->stdio = NIL(Void_t*);
f->mode = SF_AVAIL;
}
}
done:
if(data)
free(data);
return rv;
}
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