我已经在这个网站上搜索了所有关于这个问题的信息。
我的程序方案是：
- 有一个服务器总是监听来自客户端的请求。
- 有一个客户端总是
char在 2 秒内向服务器请求
得到错误信息：
在程序运行大约 1024 次后，socket() 函数上发生了太多打开的文件。
我目前的解决方案是增加打开文件的数量：
"ulimit -n 5000"，但我认为这不是一个完美的解决方案，因为它会使程序运行 5000 次。
那么，有人有更好的解决方案吗？
环境：
- Ubuntu 10
- c语言
我的代码如下：
客户：
int sockfd;
struct sockaddr_in address;
int socket_port = 9734;
while (1) {
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
DieWithSystemMessage("socket() failed");//<<===========Too many open files
memset(&address, 0, sizeof(address));
address.sin_family = AF_INET;
address.sin_addr.s_addr = inet_addr("127.0.0.1");
address.sin_port = socket_port;
//Establish the connection to the server
if ((connect(sockfd, (struct sockaddr *) &address, sizeof(address)))
< 0)
DieWithSystemMessage("connect() failed");
if (rename_count % 2 == 0)
ch = 'A';
else if (rename_count % 2 == 1)
ch = 'B';
else
ch = 'E';
ssize_t numBytes = send(sockfd, &ch, strlen(&ch), 0);
if (numBytes < 0)
DieWithSystemMessage("send() failed");
else if (numBytes != strlen(&ch))
DieWithUserMessage("send()", "sent unexpected number of bytes");
//fflush(sockfd);
shutdown(sockfd, SHUT_RDWR);
rename_count++;
}
服务器：
int server_sockfd, client_sockfd;
int server_len, client_len;
socklen_t clntAddrLen;
struct sockaddr_in server_address;
struct sockaddr_in client_address;
uint64_t start_time_micro, end_time_micro;
int socket_num = 9734;
server_sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (server_sockfd < 0)
DieWithSystemMessage("socket() failed");
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = inet_addr("127.0.0.1");
server_address.sin_port = socket_num;
if ((bind(server_sockfd, (struct sockaddr *) &server_address,
sizeof(server_address))) < 0)
DieWithSystemMessage("bind() failed");
if ((listen(server_sockfd, 5)) < 0)
DieWithSystemMessage("listen() failed");
while (1) {
char ch;
printf("\nserver waiting\n");
//accept a connect
clntAddrLen = sizeof(client_address);
client_sockfd = accept(server_sockfd,
(struct sockaddr *) &client_address, &clntAddrLen);
if (client_sockfd < 0)
DieWithSystemMessage("accept() failed");
//reading and writing through client side
ssize_t numBytesRcvd = recv(client_sockfd, &ch, 1, 0);
if (numBytesRcvd < 0)
DieWithSystemMessage("recv() failed");
if (ch == 'A') {
rename_num = 0;//printf("A\n");
} else if (ch == 'B') {
rename_num = 1;//printf("B\n");
} else
;
printf("%d. Got it!!!\n", i);
close(client_sockfd);
}
close(server_sockfd);