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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* 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"
/* Change the file descriptor
**
** Written by Kiem-Phong Vo.
*/
#if __STD_C
static int _sfdup(int fd, int newfd)
#else
static int _sfdup(fd,newfd)
int fd;
int newfd;
#endif
{
reg int dupfd;
#ifdef F_DUPFD /* the simple case */
while((dupfd = sysfcntlf(fd,F_DUPFD,newfd)) < 0 && errno == EINTR)
errno = 0;
return dupfd;
#else /* do it the hard way */
if((dupfd = sysdupf(fd)) < 0 || dupfd >= newfd)
return dupfd;
/* dup() succeeded but didn't get the right number, recurse */
newfd = _sfdup(fd,newfd);
/* close the one that didn't match */
CLOSE(dupfd);
return newfd;
#endif
}
#if __STD_C
int sfsetfd(Sfio_t* f, int newfd)
#else
int sfsetfd(f,newfd)
Sfio_t *f;
int newfd;
#endif
{
reg int oldfd;
SFMTXDECL(f);
SFMTXENTER(f, -1);
if(f->flags&SF_STRING)
SFMTXRETURN(f, -1);
if((f->mode&SF_INIT) && f->file < 0)
{ /* restoring file descriptor after a previous freeze */
if(newfd < 0)
SFMTXRETURN(f, -1);
}
else
{ /* change file descriptor */
if((f->mode&SF_RDWR) != f->mode && _sfmode(f,0,0) < 0)
SFMTXRETURN(f, -1);
SFLOCK(f,0);
oldfd = f->file;
if(oldfd >= 0)
{ if(newfd >= 0)
{ if((newfd = _sfdup(oldfd,newfd)) < 0)
{ SFOPEN(f,0);
SFMTXRETURN(f, -1);
}
CLOSE(oldfd);
}
else
{ /* sync stream if necessary */
if(((f->mode&SF_WRITE) && f->next > f->data) ||
(f->mode&SF_READ) || f->disc == _Sfudisc)
{ if(SFSYNC(f) < 0)
{ SFOPEN(f,0);
SFMTXRETURN(f, -1);
}
}
if(((f->mode&SF_WRITE) && f->next > f->data) ||
((f->mode&SF_READ) && f->extent < 0 &&
f->next < f->endb) )
{ SFOPEN(f,0);
SFMTXRETURN(f, -1);
}
#ifdef MAP_TYPE
if((f->bits&SF_MMAP) && f->data)
{ SFMUNMAP(f,f->data,f->endb-f->data);
f->data = NIL(uchar*);
}
#endif
/* make stream appears uninitialized */
f->endb = f->endr = f->endw = f->data;
f->extent = f->here = 0;
f->mode = (f->mode&SF_RDWR)|SF_INIT;
f->bits &= ~SF_NULL; /* off /dev/null handling */
}
}
SFOPEN(f,0);
}
/* notify changes */
if(_Sfnotify)
(*_Sfnotify)(f, SF_SETFD, (void*)((long)newfd));
f->file = newfd;
SFMTXRETURN(f,newfd);
}
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