原创 socket 简单编程步骤及代码（GNU/linux编程指南中的例子）

  close(temp_sock_descriptor);
 } 
} 

执行结果：

[root@xing GNUlinux]# ./server
Accepting connections ...
received from client:A default test string

client.c

#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

char *host_name = "127.0.0.1";
int port = 8000;

void main(int argc,char *argv[]) {
 char buf[8192];
 char message[256];
 int socket_descriptor;
 struct sockaddr_in pin;
 struct hostent *server_host_name;
 
 char *str = "A default test string";
 
 if(argc<2){
  printf("usage:' test \"Any test string\"\n");
  printf("We wull send a default test string.\n");
 }else{
  str = argv[1];
 }

 if( server_host_name = gethostbyname(host_name) == 0) {
  perror("Error resolving local host\n");
  exit(1);
 }

 bzero(&pin, sizeof(pin));
 pin.sin_family = AF_INET;
 pin.sin_addr.s_addr = htonl(INADDR_ANY);
 pin.sin_addr.s_addr = ( (struct in_addr *)(server_host_name->h_addr))->s_addr;
 pin.sin_port = htons(port);
 
 if( (socket_descriptor = socket(AF_INET, SOCK_STREAM ,0 )) == -1) {
  perror("Error opening socket\n");
  exit(1);
 } 
 
 if( connect(socket_descriptor, (void *)&pin, sizeof(pin)) == -1) {
  perror("Error connecting to socket\n");
  exit(1);
 }
 printf("sending messag %s to server ... \n", str);
 if( send (socket_descriptor, buf, strlen(str), 0) == -1) {
  perror("Error in send\n");
  exit(1);
 }
 printf("..sent message.. wait for response...\n");
 
 if(recv(socket_descriptor, buf ,8192,0) == -1) {
  perror("Error in receiving response from server \n");
  exit(1);
 }
 
 printf("\nResponse from server:\n\n%s\n",buf);
 
 close(socket_descriptor);
}

执行结果：

[root@xing GNUlinux]# ./client
usage:' test "Any test string"
We will send a default test string.
sending messag A default test string to server ...
..sent message.. wait for response...

Response from server:

A DEFAULT TEST STRING
[root@xing GNUlinux]#