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j = sizeof(int);
if (no_sack != -1) {
if (setsockopt(fd, proto->p_proto,
TCP_DO_SACK, (char *)&no_sack, j) < 0)
perror("disable/enable SACKs for all connections");
if (getsockopt(fd, proto->p_proto,
TCP_DO_SACK, (char *)&tno_sack, &j) < 0)
perror("disable/enable SACK for all connections");
if (no_sack != tno_sack)
printf("no_sack != tno_sack");
}