TCP併發服務器是通過創建子進程來處理不同客戶端的請求實現的
server.c
/*
** TCP併發服務器
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define portnumber 3333
int main( int argc, char *argv[] )
{
int sockfd, temp_fd;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int sin_size;
int nbytes;
char buffer[1024];
int n_fork;
/* (1)分配空間和初始化 */
/* 服務器端開始建立sockfd描述符 */
if( ( sockfd = socket(AF_INET, SOCK_STREAM, 0) ) == -1 )
{ // AF_INET:IPV4;SOCK_STREAM:TCP
perror("call to socket");
exit(1);
}
/* 服務器端填充 sockaddr結構 */
bzero( &server_addr, sizeof(struct sockaddr_in) ); //server_addr初始化置0
server_addr.sin_family = AF_INET; //internet
server_addr.sin_addr.s_addr = htonl(INADDR_ANY); //INADDR_ANY 表示主機可以是任意IP地址,即服務器程序可以綁定到所有的IP上
//server_addr.sin_addr.s_addr=inet_addr("192.168.1.1"); //用於綁定到一個固定IP,inet_addr用於把數字加格式的ip轉化爲整形ip
server_addr.sin_port = htons(portnumber); // (將本機器上的short數據轉化爲網絡上的short數據)端口號
/*捆綁sockfd描述符到IP地址**/
if( bind( sockfd, (struct sockaddr *)(&server_addr), sizeof(server_addr) ) == -1 )
{
perror("call to bind");
exit(1);
}
/* 設置允許連接的最大客戶端數 */
if( listen( sockfd, 5 ) == -1 )
{
perror("call to listen");
exit(1);
}
printf("Accepting connections ...\n");
while(1)
{
/* 服務器阻塞,直到客戶程序建立連接 */
sin_size = sizeof( struct sockaddr_in );
temp_fd = accept( sockfd, (struct sockaddr *)( &client_addr ), &sin_size );
if( temp_fd == -1 )
{
perror("call to accept");
exit(1);
}
/**創建子進程在處理器客戶端的請求*/
if( ( n_fork = fork() ) == 0)
{
fprintf(stderr,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr));
if( ( nbytes = read( temp_fd, buffer, 1024 ) ) == -1 )
{
perror("call to read");
exit(1);
}
buffer[nbytes] = '\0';
printf( "Server received %s\n", buffer );
}
/**本次通信結束**/
else
close(temp_fd);
/*下次循環*/
}
/**結束通信**/
close(sockfd);
exit(0);
}
client.c
/*
**TCP客戶端通信服務程序
**執行時,需要寫入server的ip
** 如: ./client 115.158.92.170
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define portnumber 3333
int main( int argc, char *argv[] )
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
if( argc != 2 )
{
fprintf(stderr,"Usage:%s hostname \a\n",argv[0]);
exit(1);
}
/*使用hostname查詢host名字*/
if( ( host = gethostbyname( argv[1] ) ) == NULL )
{
perror("Error resolving local host\n");
exit(1);
}
/* 客戶程序開始建立 sockfd描述符 */
if( ( sockfd = socket( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
{
perror("Error opening socket");
exit(1);
}
/* 客戶端程序填充服務端的資料 */
bzero(&server_addr,sizeof(server_addr)); // 初始化,置0
server_addr.sin_family=AF_INET; // IPV4
server_addr.sin_port=htons(portnumber); // (將本機器上的short數據轉化爲網絡上的short數據)端口號
server_addr.sin_addr=*((struct in_addr *)host->h_addr); // IP地址
/* 客戶端程序發起連接請求 */
if( connect( sockfd, (struct sockaddr *)(&server_addr), sizeof(struct sockaddr) ) == -1)
{
perror("Error connecting to socket\n");
exit(1);
}
/* 連接成功了 */
printf("Please input char:\n");
/* 發送數據 */
fgets(buffer,1024,stdin);
write(sockfd,buffer,strlen(buffer));
/* 結束通訊 */
close(sockfd);
exit(0);
}