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Annotation of xinu/sys/LSI/lfclose.c, revision 1.1

1.1     ! root        1: /* lfclose.c - lfclose */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <disk.h>
        !             7: #include <lfile.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  *  lfclose  --  close a file by flushing output and freeing device slot
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: lfclose(devptr)
        !            14: struct devsw   *devptr;
        !            15: {
        !            16:        struct  dsblk   *dsptr;
        !            17:        struct  dir     *dirptr;
        !            18:        struct  flblk   *flptr;
        !            19:        int     diskdev;
        !            20:        char    ps;
        !            21: 
        !            22:        disable(ps);
        !            23:        flptr = (struct flblk *) devptr->dvioblk;
        !            24:        if (flptr->fl_pid != currpid) {
        !            25:                restore(ps);
        !            26:                return(SYSERR);
        !            27:        }
        !            28:        diskdev = flptr->fl_dev;
        !            29:        dsptr = (struct dsblk *)devtab[diskdev].dvioblk;
        !            30:        dirptr = (struct dir *) dsptr->ddir;
        !            31:        if ( (flptr->fl_mode & FLWRITE) && flptr->fl_dch)
        !            32:                lfsflush(flptr);
        !            33:        flptr->fl_pid = 0;
        !            34:        dsptr->dnfiles--;
        !            35:        write(diskdev, dskbcpy(dirptr), DIRBLK);
        !            36:        restore(ps);
        !            37:        return(OK);
        !            38: }
        !            39: 

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