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