Thread to open socket - c

Question

Hello i made this code to open a socket and make a thread to send data so the socket
int is_valid_fd(int fd)
{
return fcntl(fd, F_GETFD) != -1 || errno != EBADF;
}
int main(int Count, char *Strings[])
{
pfd.events = POLLIN;
pfd.revents = 0;
/*---Create streaming socket---*/
if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )
{
perror("Socket");
exit(errno);
}
/*---Initialize address/port structure---*/
bzero(&self, sizeof(self));
self.sin_family = AF_INET;
self.sin_port = htons(MY_PORT);
self.sin_addr.s_addr = INADDR_ANY;
/*---Assign a port number to the socket---*/
if ( bind(sockfd, (struct sockaddr*)&self, sizeof(self)) != 0 )
{
perror("socket--bind");
exit(errno);
}
/*---Make it a "listening socket"---*/
if ( listen(sockfd, 20) != 0 )
{
perror("socket--listen");
exit(errno);
}
err = pthread_create(&(tid), NULL, &thread_accept, NULL);
if (err != 0)
printf("\ncan't create thread :[%s]", strerror(err));
/*---Forever... ---*/
while(1){
if(0<poll(&pfd,1,100)){
if(pfd.revents & POLLIN){
run = read(pfd.fd, &t,1);
}
}
if(run){
if(is_valid_fd(clientfd))send(clientfd, "12 ",3,0);
/*---Close data connection---*/
}
printf("hejsa\n");
fflush(stdout);
sleep(1);
}
/*---Clean up (should never get here!)---*/
close(sockfd);
return 0;
}
void* thread_accept(){
while (1){
/*---accept a connection (creating a data pipe)---*/
clientfd = accept(sockfd, (struct sockaddr*)&client_addr, &addrlen);
pfd.fd=clientfd;
printf("%s:%d, connected\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
run=1;
/*---Echo back anything sent---*/
send(clientfd, buffer, recv(clientfd, buffer, MAXBUF, 0), 0);
//close(clientfd);
}
}
My problem is then, that when i close the socket connection, the program shuts down instead of just closing the socket and keep printf("hejsa\n)

Answer 1

I don't see where you break the while loop?
you should also protect your shared data with mutex or something.
I have a short example that do something similar(but in different way) here