Linux select TCP并发服务器与客户端编程

http://blog.csdn.net/szkbsgy/article/details/10558881

[cpp] view plain copy 

<span style="font-size:18px;">服务端：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/select.h>
#include <errno.h>
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 8000
#define MAX_RECV_LEN 1024
#define MAX_CLIENT_NUM 30
#define BACK_LOG 20
static int running = 1;
int main(int argc, char *argv[])
{
int sock_fd = -1;
int ret = -1;
struct sockaddr_in serv_addr;
struct sockaddr_in cli_addr;
socklen_t serv_addr_len = 0;
socklen_t cli_addr_len = 0;
int client_fd[MAX_CLIENT_NUM];
char recv_buf[MAX_RECV_LEN];
int new_conn_fd = -1;
int i = 0;
int max_fd = -1;
int num = -1;
struct timeval timeout;
fd_set read_set;
fd_set write_set;
fd_set select_read_set;
FD_ZERO(&read_set);
FD_ZERO(&write_set);
FD_ZERO(&select_read_set);
for (i = 0; i < MAX_CLIENT_NUM; i++)
{
client_fd[i] = -1;
}
memset(&serv_addr, 0, sizeof(serv_addr));
memset(&cli_addr, 0, sizeof(cli_addr));
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if (sock_fd < 0)
{
perror("Fail to socket");
exit(1);
}
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(SERVER_PORT);
serv_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
unsigned int value = 1;
if (setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
(void *)&value, sizeof(value)) < 0)
{
perror("Fail to setsockopt");
exit(1);
}
serv_addr_len = sizeof(serv_addr);
if (bind(sock_fd, (struct sockaddr*)&serv_addr, serv_addr_len) < 0)
{
perror("Fail to bind");
exit(1);
}
if (listen(sock_fd, BACK_LOG) < 0)
{
perror("Fail to listen");
exit(1);
}
char buf[1024];
max_fd = sock_fd;
int len;
FD_SET(sock_fd, &read_set);
while (running)
{
timeout.tv_sec = 5;
timeout.tv_usec = 0;
max_fd = sock_fd;
for (i = 0; i < MAX_CLIENT_NUM; i++)
{
if (max_fd < client_fd[i])
{
max_fd = client_fd[i];
}
}
select_read_set = read_set;
ret = select(max_fd + 1, &select_read_set, NULL, NULL, &timeout);
if (ret == 0)
{
printf("timeout\n");
}
else if (ret < 0)
{
printf("error occur\n");
}
else
{
if (FD_ISSET(sock_fd, &select_read_set))
{
printf("new client comes\n");
len = sizeof(cli_addr);
new_conn_fd = accept(sock_fd, (struct sockaddr*)&cli_addr, &len);
if (new_conn_fd < 0)
{
perror("Fail to accept");
exit(1);
}
else
{
for (i = 0; i < MAX_CLIENT_NUM; i++)
{
if (client_fd[i] == -1)
{
client_fd[i] = new_conn_fd;
FD_SET(new_conn_fd, &read_set);
break;
}
if (max_fd < new_conn_fd)
{
max_fd = new_conn_fd;
}
}
}
}
else
{
for (i = 0; i < MAX_CLIENT_NUM; i++)
{
if (-1 == client_fd[i]) {
continue;
}
memset(recv_buf, 0, MAX_RECV_LEN);
if (FD_ISSET(client_fd[i], &select_read_set))
{
num = read(client_fd[i], recv_buf, MAX_RECV_LEN);
if (num < 0)
{
printf("Client(%d) left\n", client_fd[i]);
FD_CLR(client_fd[i], &read_set);
close(client_fd[i]);
client_fd[i] = -1;
}
else if (num > 0)
{
recv_buf[num] = '\0';
printf("Recieve client(%d) data\n", client_fd[i]);
printf("Data: %s\n\n", recv_buf);
} if (num == 0)
{
printf("Client(%d) exit\n", client_fd[i]);
FD_CLR(client_fd[i], &read_set);
close(client_fd[i]);
client_fd[i] = -1;
}
}
}
}
}
}
return 0;
}
客户端：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/select.h>
#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 8000
#define MAX_RECV_LEN 1024
static int running = 1;
int main(int argc, char *argv[])
{
int sock_fd = -1;
int ret = -1;
struct sockaddr_in serv_addr;
struct sockaddr_in cli_addr;
socklen_t serv_addr_len = 0;
memset(&serv_addr, 0, sizeof(serv_addr));
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
if (sock_fd < 0)
{
perror("Fail to socket");
exit(1);
}
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(SERVER_PORT);
serv_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
serv_addr_len = sizeof(serv_addr);
if (connect(sock_fd, (struct sockaddr *)&serv_addr, serv_addr_len) < 0)
{
perror("Fail to connect");
exit(1);
}
char buf[1024];
int num = 0;
while (running)
{
num = read(STDIN_FILENO, buf, MAX_RECV_LEN);
if (num > 0)
{
buf[num] = '\0';
printf("buf: %s\n", buf);
num = write(sock_fd, buf, num);
if (num < 0)
{
printf("write failed\n");
exit(1);
}
if (strncmp(buf, "exit", strlen("exit")) == 0)
{
printf("Client exit\n");
close(sock_fd);
return 0;
}
}
}
return 0;
} </span>

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Linux select TCP并发服务器与客户端编程

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