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Annotation of xinu/sys/preset.c, revision 1.1

1.1     ! root        1: /* preset.c - preset */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <mark.h>
        !             6: #include <ports.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  preset  --  reset a port, freeing waiting processes and messages
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: SYSCALL        preset(portid, dispose)
        !            13:        int     portid;
        !            14:        int     (*dispose)();
        !            15: {
        !            16:        PStype  ps;
        !            17:        struct  pt *ptptr;
        !            18: 
        !            19:        disable(ps);
        !            20:        if ( isbadport(portid) ||
        !            21: #ifdef MEMMARK
        !            22:             unmarked(ptmark) ||
        !            23: #endif
        !            24:             (ptptr= &ports[portid])->ptstate != PTALLOC ) {
        !            25:                restore(ps);
        !            26:                return(SYSERR);
        !            27:        }
        !            28:        _ptclear(ptptr, PTALLOC, dispose);
        !            29:        restore(ps);
        !            30:        return(OK);
        !            31: }

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