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Viewing changes to tools/sfio/sfsetfd.c

  • Committer: Bazaar Package Importer
  • Author(s): Stephen M Moraco
  • Date: 2002-02-05 18:52:12 UTC
  • Revision ID: james.westby@ubuntu.com-20020205185212-8i04c70te00rc40y
Tags: upstream-1.7.16
Import upstream version 1.7.16

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tools/sfio/sfsetfd.c
 
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#include        "sfhdr.h"
 
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/*      Change the file descriptor
 
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**
 
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**      Written by Kiem-Phong Vo.
 
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*/
 
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#if __STD_C
 
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static int _sfdup(reg int fd, reg int newfd)
 
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#else
 
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static int _sfdup(fd,newfd)
 
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reg int fd;
 
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reg int newfd;
 
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#endif
 
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{
 
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        reg int dupfd;
 
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#ifdef F_DUPFD  /* the simple case */
 
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        while((dupfd = fcntl(fd,F_DUPFD,newfd)) < 0 && errno == EINTR)
 
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                errno = 0;
 
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        return dupfd;
 
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#else   /* do it the hard way */
 
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        if((dupfd = dup(fd)) < 0 || dupfd >= newfd)
 
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                return dupfd;
 
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        /* dup() succeeded but didn't get the right number, recurse */
 
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        newfd = _sfdup(fd,newfd);
 
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        /* close the one that didn't match */
 
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        CLOSE(dupfd);
 
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        return newfd;
 
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#endif
 
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}
 
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#if __STD_C
 
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int sfsetfd(reg Sfio_t* f, reg int newfd)
 
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#else
 
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int sfsetfd(f,newfd)
 
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reg Sfio_t      *f;
 
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reg int         newfd;
 
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#endif
 
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{
 
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        reg int         oldfd;
 
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        SFMTXSTART(f, -1);
 
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        if(f->flags&SF_STRING)
 
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                SFMTXRETURN(f, -1);
 
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        if((f->mode&SF_INIT) && f->file < 0)
 
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        {       /* restoring file descriptor after a previous freeze */
 
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                if(newfd < 0)
 
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                        SFMTXRETURN(f, -1);
 
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        }
 
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        else
 
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        {       /* change file descriptor */
 
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                if((f->mode&SF_RDWR) != f->mode && _sfmode(f,0,0) < 0)
 
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                        SFMTXRETURN(f, -1);
 
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                SFLOCK(f,0);
 
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                oldfd = f->file;
 
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                if(oldfd >= 0)
 
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                {       if(newfd >= 0)
 
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                        {       if((newfd = _sfdup(oldfd,newfd)) < 0)
 
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                                {       SFOPEN(f,0);
 
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                                        SFMTXRETURN(f, -1);
 
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                                }
 
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                                CLOSE(oldfd);
 
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                        }
 
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                        else
 
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                        {       /* sync stream if necessary */
 
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                                if(((f->mode&SF_WRITE) && f->next > f->data) ||
 
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                                   (f->mode&SF_READ) || f->disc == _Sfudisc)
 
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                                {       if(SFSYNC(f) < 0)
 
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                                        {       SFOPEN(f,0);
 
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                                                SFMTXRETURN(f, -1);
 
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                                        }
 
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                                }
 
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                                if(((f->mode&SF_WRITE) && f->next > f->data) ||
 
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                                   ((f->mode&SF_READ) && f->extent < 0 &&
 
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                                    f->next < f->endb) )
 
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                                {       SFOPEN(f,0);
 
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                                        SFMTXRETURN(f, -1);
 
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                                }
 
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#ifdef MAP_TYPE
 
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                                if((f->bits&SF_MMAP) && f->data)
 
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                                {       SFMUNMAP(f,f->data,f->endb-f->data);
 
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                                        f->data = NIL(uchar*);
 
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                                }
 
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#endif
 
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                                /* make stream appears uninitialized */
 
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                                f->endb = f->endr = f->endw = f->data;
 
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                                f->extent = f->here = 0;
 
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                                f->mode = (f->mode&SF_RDWR)|SF_INIT;
 
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                                f->bits &= ~SF_NULL;    /* off /dev/null handling */
 
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                        }
 
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                }
 
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                SFOPEN(f,0);
 
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        }
 
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        /* notify changes */
 
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        if(_Sfnotify)
 
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                (*_Sfnotify)(f,SF_SETFD,newfd);
 
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        f->file = newfd;
 
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        SFMTXRETURN(f,newfd);
 
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}