不同的服务器测试使用了相同的客户端代码，服务器实现的功能是简单的将客户端发过来的数据发回客户端。
客户端代码如下：
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <strings.h>
int main(int argc, char **argv)
{
if(3 != argc)
{
printf("Usage: %s <IP> <PORT>\n", argv[0]);
exit(-1);
}
int my_fd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == my_fd)
{
perror("socket");
exit(-1);
}
struct sockaddr_in serveraddr = {0};
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(atoi(argv[2]));
serveraddr.sin_addr.s_addr = inet_addr(argv[1]);
if(-1 == connect(my_fd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)))
{
perror("connect");
exit(-1);
}
printf("success !\n");
char buf[100];
while(1)
{
printf("input: ");fflush(stdout);
gets(buf);
write(my_fd, buf, 100);
bzero(buf, 100);
read(my_fd, buf, 100);
printf("recv : %s\n", buf);
}
}
1.进程实现并发服务器设计
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
int main()
{
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == listen_fd)
{
perror("socket");
exit(-1);
}
struct sockaddr_in myaddr = {0}, clientaddr= {0};
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(8888);
myaddr.sin_addr.s_addr = inet_addr("0.0.0.0");//0 //INADDR_ANY
if(-1 == bind(listen_fd, (struct sockaddr*)&myaddr, sizeof(myaddr)))
{
perror("bind");
exit(-1);
}
listen(listen_fd, 10);
int len = sizeof(clientaddr);//应指定大小
char buf[100];
while(1)
{
int client_fd = accept(listen_fd, (struct sockaddr*)&clientaddr, &len);
if(-1 == client_fd)
{
perror("accept");
exit(-1);
}
printf("incomming: %s\n", inet_ntoa(clientaddr.sin_addr) );
pid_t pid = fork();
if(0 == pid)
{
printf("creat process: %d\n", getpid());
close(listen_fd);
while(1)
{
read(client_fd, buf, 100);
if(0 == strncmp("time", buf, 4))
{
time_t t = time(NULL);
snprintf(buf, 20, "%s", ctime(&t));
// strcpy(buf, ctime(&t));
}
if(0 == strncmp("quit", buf, 4))
{
close(client_fd);
exit(0);
}
write(client_fd, buf, 100);
}
}
}
}
2.多线程实现并发服务器
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <pthread.h>
void *fun(void *p)
{
int client_fd = *((int*)p);//????
char buf[100];
while(1)
{
read(client_fd, buf, 100);
if(0 == strncmp("time", buf, 4))
{
time_t t = time(NULL);
snprintf(buf, 20, "%s", ctime(&t));
// strcpy(buf, ctime(&t));
}
write(client_fd, buf, 100);
}
}
int main()
{
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == listen_fd)
{
perror("socket");
exit(-1);
}
struct sockaddr_in myaddr = {0}, clientaddr= {0};
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(8888);
myaddr.sin_addr.s_addr = inet_addr("0.0.0.0");//0 //INADDR_ANY
if(-1 == bind(listen_fd, (struct sockaddr*)&myaddr, sizeof(myaddr)))
{
perror("bind");
exit(-1);
}
listen(listen_fd, 10);
int len = sizeof(clientaddr);//应指定大小
char buf[100];
while(1)
{
int client_fd = accept(listen_fd, (struct sockaddr*)&clientaddr, &len);
if(-1 == client_fd)
{
perror("accept");
exit(-1);
}
printf("incomming: %s\n", inet_ntoa(clientaddr.sin_addr) );
pthread_t t;
pthread_create(&t, NULL, fun, &client_fd);
printf("create thread: %ld\n", t);
}
}
3.多路IO复用实现的并发服务器
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
int main()
{
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == listen_fd)
{
perror("socket");
exit(-1);
}
struct sockaddr_in myaddr = {0}, clientaddr= {0};
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(8888);
myaddr.sin_addr.s_addr = inet_addr("0.0.0.0");//0 //INADDR_ANY
if(-1 == bind(listen_fd, (struct sockaddr*)&myaddr, sizeof(myaddr)))
{
perror("bind");
exit(-1);
}
listen(listen_fd, 10);
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(listen_fd, &readfds);
fd_set tem_fds = readfds;
int max_fd = listen_fd;
while(1)
{
readfds = tem_fds;
if(-1 == select(max_fd+1, &readfds, NULL, NULL, NULL))
{
perror("select");
exit(-1);
}
if(FD_ISSET(listen_fd, &readfds))
{
int len = sizeof(clientaddr);//应指定大小
int client_fd = accept(listen_fd, (struct sockaddr*)&clientaddr, &len);
if(-1 == client_fd)
{
perror("accept");
exit(-1);
}
printf("incomming: %s\n", inet_ntoa(clientaddr.sin_addr) );
FD_SET(client_fd, &tem_fds);
max_fd = (max_fd > client_fd) ? max_fd:client_fd;
}
int i;
for(i = 0; i<max_fd+1; i++)
{
if(FD_ISSET(i, &readfds) && i!=listen_fd)
{
char buf[100];
read(i, buf, 100);
if(0 == strncmp("time", buf, 4))
{
time_t t = time(NULL);
snprintf(buf, 20, "%s", ctime(&t));
// strcpy(buf, ctime(&t));
}
write(i, buf, 100);
}//if
}
}//while
}
4.循环服务器
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
int main()
{
int listen_fd = socket(AF_INET, SOCK_STREAM, 0);
if(-1 == listen_fd)
{
perror("socket");
exit(-1);
}
struct sockaddr_in myaddr = {0}, clientaddr= {0};
myaddr.sin_family = AF_INET;
myaddr.sin_port = htons(8888);
myaddr.sin_addr.s_addr = inet_addr("0.0.0.0");//0 //INADDR_ANY
if(-1 == bind(listen_fd, (struct sockaddr*)&myaddr, sizeof(myaddr)))
{
perror("bind");
exit(-1);
}
listen(listen_fd, 10);
int len = sizeof(clientaddr);//应指定大小
char buf[100];
while(1)
{
int client_fd = accept(listen_fd, (struct sockaddr*)&clientaddr, &len);
if(-1 == client_fd)
{
perror("accept");
exit(-1);
}
printf("incomming: %s\n", inet_ntoa(clientaddr.sin_addr) );
while(1)
{
read(client_fd, buf, 100);
if(0 == strncmp("time", buf, 4))
{
time_t t = time(NULL);
snprintf(buf, 20, "%s", ctime(&t));
// strcpy(buf, ctime(&t));
}
if(0 == strncmp("quit", buf, 4))
break;
write(client_fd, buf, 100);
}
}
}