简单的linux c socket例子

服务端代码：

# include < stdio. h> # include < string . h> # include < sys/ socket . h> # include < netinet/ in. h> # define MAXDATASIZE 1024 # define SERVERPORT 8000 # define MAXCONN_NUM 10 int main( ) { char buf[ MAXDATASIZE] ; int sockfd, new_fd, numbytes; struct sockaddr_in server_addr; struct sockaddr_in client_addr; int sin_size; if ( ( sockfd = socket ( AF_INET , SOCK_STREAM , 0) ) = = - 1) { perror ( "socket error" ) ; return 1; } memset ( & client_addr, 0, sizeof ( struct sockaddr ) ) ; server_addr. sin_family = AF_INET ; server_addr. sin_port = htons ( SERVERPORT) ; server_addr. sin_addr. s_addr = INADDR_ANY ; if ( bind ( sockfd, ( struct sockaddr * ) & server_addr, sizeof ( struct sockaddr ) ) = = - 1) { perror ( "bind error" ) ; return 1; } if ( listen ( sockfd, MAXCONN_NUM) = = - 1) { perror ( "listen error" ) ; return 1; } while ( 1) { sin_size = sizeof ( struct sockaddr_in ) ; if ( ( new_fd = accept ( sockfd, ( struct sockaddr * ) & client_addr, & sin_size) ) = = - 1) { perror ( "accept error" ) ; continue ; } printf ( "server: got connection from %s/n" , inet_ntoa( client_addr. sin_addr) ) ; if ( ( numbytes = recv ( new_fd, buf, MAXDATASIZE, 0) ) = = - 1) { perror ( "recv error" ) ; return 1; } if ( numbytes) { buf[ numbytes] = '/0' ; printf ( "received: %s/n" , buf) ; sleep ( 3) ; } printf ( "send: hi~~/n" ) ; if ( send ( new_fd, "hi~~" , 5, 0) = = - 1) { perror ( "send error" ) ; return 1; } close ( new_fd) ; } return 0; }

客户端代码：

# include < stdio. h> # include < string . h> # include < sys/ socket . h> # include < netinet/ in. h> # define MAXDATASIZE 1024 # define SERVERIP "192.168.0.2" # define SERVERPORT 8000 int main( int argc, char * argv[ ] ) { char buf[ MAXDATASIZE] ; int sockfd, numbytes; struct sockaddr_in server_addr; if ( ( sockfd = socket ( AF_INET , SOCK_STREAM , 0) ) = = - 1) { perror ( "socket error" ) ; return 1; } memset ( & server_addr, 0, sizeof ( struct sockaddr ) ) ; server_addr. sin_family = AF_INET ; server_addr. sin_port = htons ( SERVERPORT) ; server_addr. sin_addr. s_addr = inet_addr( SERVERIP) ; if ( connect ( sockfd, ( struct sockaddr * ) & server_addr, sizeof ( struct sockaddr ) ) = = - 1) { perror ( "connect error" ) ; return 1; } printf ( "send: Hello, world!/n" ) ; if ( send ( sockfd, "Hello, world!" , 14, 0) = = - 1) { perror ( "send error" ) ; return 1; } if ( ( numbytes = recv ( sockfd, buf, MAXDATASIZE, 0) ) = = - 1) { perror ( "recv error" ) ; return 1; } if ( numbytes) { buf[ numbytes] = '/0' ; printf ( "received: %s/n" , buf) ; } close ( sockfd) ; return 0; }