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Annotation of 41BSD/cmd/refer/refer3.c, revision 1.1

1.1     ! root        1: # include "refer..c"
        !             2: corout(in, out, rprog, arg, outlen)
        !             3:        char *in, *out, *rprog;
        !             4: {
        !             5: # define move(x, y) close(y); dup(x); close(x);
        !             6: int pipev[2], fr1, fr2, fw1, fw2, n;
        !             7: 
        !             8: pipe (pipev); fr1= pipev[0]; fw1 = pipev[1];
        !             9: pipe (pipev); fr2= pipev[0]; fw2 = pipev[1];
        !            10: if (fork()==0)
        !            11:        {
        !            12:        close (fw1); close (fr2);
        !            13:        move (fr1, 0);
        !            14:        move (fw2, 1);
        !            15:        execl(rprog, "deliv", arg, 0);
        !            16:        err ("Can't run %s", rprog);
        !            17:        }
        !            18: close(fw2); close(fr1);
        !            19: write (fw1, in , strlen(in));
        !            20: close(fw1);
        !            21: wait(0);
        !            22: n = read (fr2, out, outlen);
        !            23: out[n]=0;
        !            24: close(fr2);
        !            25: return(n);
        !            26: }

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