![](https://img2020.cnblogs.com/blog/665372/202105/665372-20210526093534487-1669942876.png)
root@ubuntu:~/c++# ./u_server
Listener on port /tmp/echo_socket
Waiting for connections ...
Welcome message sent successfully
Adding to list of sockets as 0
Welcome message sent successfully
Adding to list of sockets as 1
recv failed: Connection reset by peer
recv failed: Connection reset by peer
Welcome message sent successfully
Adding to list of sockets as 0
Welcome message sent successfully
Adding to list of sockets as 1
recv failed: Connection reset by peer
recv failed: Connection reset by peer
^C
server
root@ubuntu:~/c++# cat u_server.c
#include <stdio.h>
#include <stdint.h>
#include <string.h> //strlen
#include <stdlib.h>
#include <errno.h>
#include <unistd.h> //close
#include <sys/un.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <sys/time.h> //FD_SET, FD_ISSET, FD_ZERO macros
#include<pthread.h> //for threading , link with lpthread
#include <fcntl.h>
#define SOCK_PATH "/tmp/echo_socket"
bool daemonize() {
int res = fork();
if (res < 0) {
perror("fork");
return false;
}
if (res != 0)
_exit(0);
// Now we're running as the daemon...
res = setsid();
if (res < 0) {
perror("setsid");
return false;
}
if (false) {
int fd = open("/dev/null", O_RDWR, 0);
if (fd >= 0) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close(fd);
}
}
return true;
}
/*
* This will handle connection for each client
* */
void *connection_handler(void *socket_desc)
{
//Get the socket descriptor
int& sock = *(int*)socket_desc;
int read_size;
char client_message[2000];
//Send some messages to the client
const char *message = "Greetings! I am your connection handler
";
write(sock , message , strlen(message));
message = "Now type something and i shall repeat what you type
";
write(sock , message , strlen(message));
//Receive a message from client
while( (read_size = recv(sock , client_message , 2000 , 0)) > 0 )
{
//end of string marker
client_message[read_size] = '