Linux C-TCP data send and receive sample

1.client End (Read)

#include <stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<arpa/inet.h>#include<sys/socket.h>voidError_handling (Char*msg);intMainintargcChar*argv[]) {    intsock_fd; structsockaddr_in serv_addr; Charmessage[ -] = {0}; intRcv_len; if(ARGC! =3) {printf ("Usage:%s <IP> <port>\n", argv[0]); Exit (1); } sock_fd= Socket (Af_inet, Sock_stream,0); if(SOCK_FD = =-1) error_handling ("sock () error"); memset (&AMP;SERV_ADDR,0,sizeof(SERV_ADDR)); Serv_addr.sin_family=af_inet; Serv_addr.sin_addr.s_addr= Inet_addr (argv[1]);//server ' s IP addrServ_addr.sin_port = htons (Atoi (argv[2]));//Port    if(Connect (SOCK_FD,structsockaddr*) &serv_addr,sizeof(SERV_ADDR)) == -1) error_handling ("Connect () error!"); Rcv_len= Read (SOCK_FD, message,sizeof(message)-1); if(Rcv_len = =-1) error_handling ("read () error!"); printf ("Message from server:%s\n", message); printf ("Read length:%d\n", Rcv_len);    Close (SOCK_FD); return 0;}voidError_handling (Char*message)    {fputs (message, stderr); FPUTC ('\ n', stderr); Exit (1);}

If you are sending data in the client, simply modify read to write.

2.server (send)

#include <stdio.h>#include<stdlib.h>#include<string.h>#include<unistd.h>#include<arpa/inet.h>#include<sys/socket.h>voidError_handling (Char*msg);intMainintargcChar*argv[]) {    intserv_sock_fd; intclnt_sock_fd; structsockaddr_in serv_addr; structsockaddr_in clnt_addr;    Socklen_t clnt_addr_size; CharMessage[] ="This is a sample tcp?sserver!"; if(ARGC! =2) {printf ("Usage:%s <port>\n", argv[0]); Exit (1); } serv_sock_fd= Socket (Af_inet, Sock_stream,0); if(SERV_SOCK_FD = =-1) error_handling ("sock () error"); memset (&AMP;SERV_ADDR,0,sizeof(SERV_ADDR)); Serv_addr.sin_family=af_inet; Serv_addr.sin_addr.s_addr=htonl (Inaddr_any); Serv_addr.sin_port= Htons (Atoi (argv[1])); if(Bind (SERV_SOCK_FD, (structsockaddr*) &serv_addr,sizeof(SERV_ADDR)) == -1) error_handling ("bind () error"); if(Listen (SERV_SOCK_FD,5) == -1) error_handling ("Listen () Error"); Clnt_addr_size=sizeof(CLNT_ADDR); CLNT_SOCK_FD= Accept (SERV_SOCK_FD, (structsockaddr*) &clnt_addr, &clnt_addr_size); if(CLNT_SOCK_FD = =-1) error_handling ("Accept () error"); Write (CLNT_SOCK_FD, message,sizeof(message));    Close (CLNT_SOCK_FD);    Close (SERV_SOCK_FD); return 0;}voidError_handling (Char*message)    {fputs (message, stderr); FPUTC ('\ n', stderr); Exit (1);}

If you are receiving data on the server side, simply modify write to read.

3, above, under Linux separately GCC compiles, runs the server program first, then runs the client program, the server side waits for the client connection, once the connection and completes the data sends, the server shuts down.

4, the server of the sample program can only connect to one client side and does not verify the correctness of the data sending and receiving.

Linux C-TCP data send and receive sample