我正在使用 C 语言通过 Linux 套接字实现一个简单的客户端-服务器检索系统。我现在已经成功连接远程服务器,但是当我关闭连接时,服务器宕机了,即服务器程序停止了。 我应该怎样做才能避免这种情况?
这是我的代码示例:
服务器:
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <netinet/in.h>
int main(void)
{
int optval;
socklen_t optlen = sizeof(optval);
char str[100] = "";
int listen_fd, conn_fd;
struct sockaddr_in servaddr;
listen_fd = socket(AF_INET, SOCK_STREAM, 0);
// check if on
getsockopt(listen_fd, SOL_SOCKET, SO_KEEPALIVE, &optval, &optlen);
printf("keep alive is %s\n", (optval? "ON" : "OFF"));
// set it on
optval = 1;
optlen = sizeof(optval);
setsockopt(listen_fd, SOL_SOCKET, SO_KEEPALIVE, &optval, optlen);
printf("done, check again.\n");
printf("keep alive is %s\n", (optval? "ON" : "OFF"));
bzero( &servaddr, sizeof(servaddr));
// set appropriate protocol and port number (15792)
// the htons() function converts the unsigned short integer
// from host byte order to network byte order.
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htons(INADDR_ANY);
servaddr.sin_port = htons(15792);
// Bind a name to a socket
bind(listen_fd, (struct sockaddr *) &servaddr, sizeof(servaddr));
// listening for incoming connection
listen(listen_fd, 10);
// accept a connection on a socket
conn_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);
do
{
// set str to null
bzero(str, 100);
// Read from a file descriptor (linux all)
read(conn_fd,str,100);
// print the received message
// printf("Received: %s\n",str);
if (!strcmp(str, "GET TIME\n"))
{
bzero(str, 100);
time_t clocks;
clocks = time(NULL);
sprintf(str, "%s", ctime(&clocks));
write(conn_fd, str, strlen(str));
//close(conn_fd);
}
else
{
bzero(str, 100);
strcpy(str, "ERROR: No such command.\n");
write(conn_fd, str, strlen(str));
//close(conn_fd);
}
} while (1);
}
客户:
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc,char **argv)
{
// declare necessary variables
int sockfd;
char recv[1024] = "";
char command[100] = "";
struct sockaddr_in servaddr;
if (argc != 2)
{
printf("usage: %s <ip address>\n", argv[0]);
exit(EXIT_FAILURE);
}
// create a socket with the appropriate protocol
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
printf("ERROR: Failed create cosket.\n");
exit(EXIT_FAILURE);
}
// Set all the socket structures with null values.
bzero(&servaddr, sizeof servaddr);
// set appropriate protocol and port number (1999)
// The htons() function converts the unsigned short integer
// hostshort from host byte order to network byte order.
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(15792);
// Convert IPv4 and IPv6 addresses from text to binary form
if (inet_pton(AF_INET, argv[1], &(servaddr.sin_addr)) <= 0)
{
printf("ERROR: Wrong ip address.\n");
exit(EXIT_FAILURE);
}
// attempt to connect to a socket
if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
{
printf("ERROR: Failed at connect.\n");
exit(EXIT_FAILURE);
}
else
{
printf("------ connect successfull ------\n");
}
do
{
printf("> ");
fgets(command, 100, stdin);
write(sockfd, command, strlen(command));
if (!strcmp(command, "QUIT\n"))
{
close(sockfd);
break;
}
// print the receive stuff
read(sockfd, recv, sizeof(recv));
fputs(recv, stdout);
bzero(recv, 1024);
} while (1);
}
最佳答案
在服务器代码中,必须在 do-while 循环中调用 accept()
函数:
// listening for incoming connection
listen(listen_fd, 10);
do
{
// accept a connection on a socket
conn_fd = accept(listen_fd, (struct sockaddr*) NULL, NULL);
...
close(conn_fd);
} while(1);
关于c - Linux C 套接字 - 保持服务器处于事件状态,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34150492/