HP Rp7410 BSD Sockets Interface Programmer's Guide - Page 102
internet address.
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Using Internet Datagram Sockets Example Using Datagram Sockets #include #include #include #include int s; /* socket descriptor */ #define BUFFERSIZE 1024 /* max size of packets to be received */ int cc; /* contains the number of bytes read */ char buffer[BUFFERSIZE]; /* buffer for packets to be read into */ struct hostent *hp; struct servent *sp; /* pointer to info of requested host */ /* pointer to service information */ struct sockaddr_in myaddr_in; /* for local socket address */ struct sockaddr_in clientaddr_in;/* for client's socket address */ struct in_addr reqaddr; /* for requested host's address */ #define ADDRNOTFOUND 0xffffffff /* return address for unfound host */ /* * M A I N * * This routine starts the server. It forks, leaving the child * to do all the work, so it does not have to be run in the * background. It sets up the socket, and for each incoming * request, it returns an answer. Each request consists of a * host name for which the requester desires to know the * internet address. The server will look up the name in its * /etc/hosts file, and return the internet address to the * client. An internet address value of all ones will be returned * if the host name is not found. NOTE: This example is valid * only if the /etc/hosts file is being used to lookup host names. * */ main(argc, argv) int argc; char *argv[]; { int addrlen; /* clear out address structures */ memset ((char *)&myaddr_in, 0, sizeof(struct sockaddr_in)); memset ((char *)&clientaddr_in, 0, sizeof(struct sockaddr_in)); /* Set up address structure for the socket. */ myaddr_in.sin_family = AF_INET; /* The server should receive on the wildcard address, * rather than its own internet address. This is * generally good practice for servers, because on * systems which are connected to more than one * network at once will be able to have one server * listening on all networks at once. Even when the * host is connected to only one network, this is good * practice, because it makes the server program more * portable. 102 Chapter 4
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