forked from Green-Sky/tomato
42 lines
1.0 KiB
C
42 lines
1.0 KiB
C
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/* Though it may look bleak at times,
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* this ring will stabilize to have one token,
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* and Tox will be the one true chat protocol!
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* -- Alex P. Klinkhamer (grencez)
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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int main(int i, char** msg)
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{
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int j, fd[4], xpd, xid;
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if (--i<1) return 1;
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srand(getpid());
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pipe(fd);
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while (xid=rand()%5, --i>0) {
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pipe(&fd[2]);
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j = (0==fork() ? 0 : 1);
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close(fd[j]);
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fd[j] = fd[j+2];
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close(fd[3-j]);
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if (j==0) break;
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}
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#define SendSc() write(fd[1], &xid, sizeof(xid))
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#define RecvPd() read(fd[0], &xpd, sizeof(xpd))
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#define A(g,v) if (g) {xid=v; puts(msg[i+1]); fflush(stdout); SendSc();}
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SendSc();
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while (RecvPd(), 1) {
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sleep(1);
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if (i==0) {
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A( xpd==0 && xid==0 , 1 );
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A( xpd==1 && xid<=1 , 2 );
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A( xpd> 1 && xid> 1 , 0 );
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continue;
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}
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A( xpd==0 && xid> 1 , xid/4 );
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A( xpd==1 && xid!=1 , 1 );
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A( xpd==2 && xid<=1 , 2+xid );
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A( xpd>=3 && xid<=1 , 4 );
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}
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return 0;
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}
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