一个 C 实现最基本的 socket 编程例子
服务端 service.c#include <stdio.h>#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
int port = 17000;
main ()
{
struct sockaddr_in sin;
struct sockaddr_in pin;
int sock_descriptor;
int temp_sock_descriptor;
int size_of_addr;
size_of_addr=sizeof(pin);
char buf;
int i, lenth;
sock_descriptor = socket (AF_INET, SOCK_STREAM, 0);
bzero (&sin, sizeof (sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons (port);
if (bind (sock_descriptor, (struct sockaddr *) &sin, sizeof (sin)) == -1)
{
perror ("bind!"); exit (1);}
if (listen (sock_descriptor, 20) == -1)
{
perror ("listen!"); exit (1);}
printf ("waiting for accepting connections from client\n");
while (1)
{
temp_sock_descriptor = accept(sock_descriptor,(struct sockaddr *)&pin,&size_of_addr);
if (temp_sock_descriptor == -1)
{
perror ("call to accept"); }
if (recv (temp_sock_descriptor, buf, sizeof (buf), 0) == -1)
{
perror ("recv!"); exit (1);}
printf ("received:%s\n", buf);
lenth = strlen (buf);
for (i = 0; i <= lenth; i++)
{
buf = toupper (buf);
if (send (temp_sock_descriptor, buf, lenth, 0) == -1)
{
perror ("send!"); exit (1);}
}
close (temp_sock_descriptor);
}
}
客户端 client.c#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
char * host_name="127.0.0.1";
int port=17000;
void main(int argc,char *argv[])
{
char buf;
char message;
int socket_descriptor;
struct sockaddr_in pin;
struct hostent *server_host_name;
char *message_str="hello,network";
if(argc<2)
{printf("send default srting.\n");
}else{
message_str=argv;
}
if((server_host_name=gethostbyname(host_name))==0)
{
perror("cant resolving localhost\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("cant connecting to server");
exit(1);
}
printf("send message %s to server ...\n",message_str);
if (send(socket_descriptor,message_str,strlen(message_str),0)==-1)
{
perror("cant send message\n");
exit(1);
}
printf("waiting for response from server\n");
if (recv(socket_descriptor,buf,sizeof(buf),0)==-1)
{
perror("cant receive response\n");
exit(1);
}
printf("\nResponse from server:\n\n%s\n",buf);
close(socket_descriptor);
}
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