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Hi, Does someone write the checksum function for Socket ICMP ? Does someone write native PING function with RPGIV instead of using PING command ? I need to wrote PING function on ICMP message for Pthread used, I found the C checksum source , but I am not familarwith C transferring to RPGIV ? Do any experts help me to transfer to RPGIV ? The C source as following: // // Mike Muuss' in_cksum() function // and his comments from the original // ping program // // * Author - // * Mike Muuss // * U. S. Army Ballistic Research Laboratory // * December, 1983 /* * I N _ C K S U M * * Checksum routine for Internet Protocol family headers (C Version) * */ u_short in_cksum(u_short *addr, int len) { register int nleft = len; register u_short *w = addr; register u_short answer; register int sum = 0; /* * Our algorithm is simple, using a 32 bit accumulator (sum), * we add sequential 16 bit words to it, and at the end, fold * back all the carry bits from the top 16 bits into the lower * 16 bits. */ while( nleft > 1 ) { sum += *w++; nleft -= 2; } /* mop up an odd byte, if necessary */ if( nleft == 1 ) { u_short u = 0; *(u_char *)(&u) = *(u_char *)w ; sum += u; } /* * add back carry outs from top 16 bits to low 16 bits */ sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ sum += (sum >> 16); /* add carry */ answer = ~sum; /* truncate to 16 bits */ return (answer); }
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