Socket_Client
socket_client.c — 1 KB
File contents
#include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #include <stdio.h> #define SRV_ADDRESS "141.22.17.137" #define SRV_PORT 7777 int main ( ) { int s_tcp; /* socket descriptor */ struct sockaddr_in sa; /* socket address structure*/ int sa_len = sizeof(struct sockaddr_in), n; char* msg="Hello World!"; sa.sin_family = AF_INET; /* select IPv4 */ sa.sin_port = htons(SRV_PORT); if (inet_pton(sa.sin_family,SRV_ADDRESS, &sa.sin_addr.s_addr) <= 0) { perror("Address Conversion"); exit(1); } if ((s_tcp=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)) < 0) { perror("TCP Socket"); exit(1); } if (connect(s_tcp,(struct sockaddr*) &sa, sa_len) < 0) { perror("Connect"); exit(1); } if((n=send(s_tcp,msg, strlen(msg),0)) > 0) { printf("Message %s sent ( %i Bytes).\n", msg, n); } close(s_tcp); }