计算在C编程中使用TCP/IP套接字连接到服务器的客户端数
在C编程中,我必须统计使用互斥和TCP/IP套接字连接到服务器的客户端数量 这是我的server.c源文件:计算在C编程中使用TCP/IP套接字连接到服务器的客户端数,c,sockets,tcp,C,Sockets,Tcp,在C编程中,我必须统计使用互斥和TCP/IP套接字连接到服务器的客户端数量 这是我的server.c源文件: int numberOfClientsConnected = 0; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; int main () { // ... creation, binding and listen ... while (1) { clientSocket = accept(se
int numberOfClientsConnected = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int main ()
{
// ... creation, binding and listen ...
while (1) {
clientSocket = accept(serverSocket, (struct sockaddr*)&newAddress, &addrSize);
pthread_mutex_lock(&mutex);
numberOfClientsConnected++;
pthread_mutex_unlock(&mutex);
child = fork();
if (child == 0) {
close(serverSocket);
while (1) {
recv(clientSocket, buffer, 1024, 0);
if (strcmp(buffer, ":exit") == 0) {
printf("%s:%d left\n", inet_ntoa(newAddress.sin_addr), ntohs(newAddress.sin_port));
pthread_mutex_lock(&mutex);
numberOfClientsConnected--;
pthread_mutex_unlock(&mutex);
break;
}
else {
printf("%s:%d wrote: %s\n", inet_ntoa(newAddress.sin_addr), ntohs(newAddress.sin_port), buffer);
printf("There are %d client(s) connected\n", numeroDiClientAttualmenteConnessi);
// Invio del messaggio
send(clientSocket, buffer, strlen(buffer), 0);
}
}
}
}
close(clientSocket);
return 0;
}
正如您在我的屏幕截图中所看到的:
如果我检查从client1连接的客户端数量,它将始终显示me 1;如果我与客户2核对,它将始终显示我2。这是连接的客户端数量,取决于我从哪个客户端发送文本。怎么了?fork创建了一个新进程,而不是一个新线程。变量不在进程之间共享。您的子进程获取变量的一个副本,并且只看到变量分叉时的值