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43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/*
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* Copyright (c) 1996 W. Richard Stevens. All rights reserved.
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* Permission to use or modify this software and its documentation only for
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* educational purposes and without fee is hereby granted, provided that
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* the above copyright notice appear in all copies. The author makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*/
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#include "cliserv.h"
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int
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main() /* simple UDP server */
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{
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struct sockaddr_in serv, cli;
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char request[REQUEST], reply[REPLY];
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int sockfd, n, clilen;
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if ( (sockfd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
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err_sys("socket error");
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memset(&serv, 0, sizeof(serv));
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serv.sin_family = AF_INET;
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serv.sin_addr.s_addr = htonl(INADDR_ANY);
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serv.sin_port = htons(UDP_SERV_PORT);
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if (bind(sockfd, (SA) &serv, sizeof(serv)) < 0)
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err_sys("bind error");
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for ( ; ; ) {
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clilen = sizeof(cli);
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if ( (n = recvfrom(sockfd, request, REQUEST, 0,
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(SA) &cli, &clilen)) < 0)
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err_sys("recvfrom error");
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/* process "n" bytes of request[] and create reply[] ... */
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if (sendto(sockfd, reply, REPLY, 0,
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(SA) &cli, sizeof(cli)) != REPLY)
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err_sys("sendto error");
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}
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}
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