?? talker.c
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#include <stdio.h> #include <stdlib.h>#include <errno.h> #include <string.h> #include <netdb.h> #include <sys/types.h> #include <netinet/in.h> #include <sys/socket.h> #define PORT 5000 // The port which is communicate with server#define LENGTH 512 // Buffer lengthint main(int argc, char *argv[]){ int sockfd; // Socket file descriptor int num; // Counter of received bytes char sdbuf[LENGTH]; // Receive buffer struct sockaddr_in addr_remote; // Host address information char sdstr[]= {"SmartARM22000 UDP Experiment."}; /* Check parameters number */ if (argc != 2) { printf ("ERROR: Please enter Host IP address follow by 'gdclient'\n"); return (0); } /* Get the Socket file descriptor */ if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { printf("ERROR: Cannot obtain Socket Descriptor!\n"); return (0); } /* Fill the socket address struct */ addr_remote.sin_family = AF_INET; // Protocol Family addr_remote.sin_port = htons(PORT); // Port number inet_pton(AF_INET, argv[1], &addr_remote.sin_addr); // Net Address bzero(&(addr_remote.sin_zero), 8); // Flush the rest of struct /* Try to connect the server */ bzero(sdbuf,LENGTH); num = sendto(sockfd, sdstr, strlen(sdstr), 0, (struct sockaddr *)&addr_remote, sizeof(struct sockaddr_in)); if( num < 0 ) { printf ("ERROR: Cannot send your data!\n", argv[1], num); } else { printf ("OK: Sent to %s total %d bytes !\n", argv[1], num); } close (sockfd); return (0);}
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