multithreading - Using Linux C. I use sleep in thread function,but the whole process ends? -

when program goes sleepsleep (1)in thread function ,it ends. have thread?

void send_packet(int sockfd, struct sockaddr_in dest_addr) {    int packetsize; while( nsend < max_no_packets) {           printf("send %d\n", nsend);     nsend++;     packetsize=pack(nsend);      if( sendto(sockfd,sendpacket,packetsize,0,(struct sockaddr *)&dest_addr,sizeof(dest_addr) )<0  )     {                perror("sendto error");         continue;     }     printf(" %d\n", packetsize);     sleep(1);  } } 

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int find_host(void * arg) {  send_packet(sockfd, present_addr); recv_packet(sockfd, recvpacket, from); 

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pthread_create(&ntid, null, find_host, (void *)&inaddr);     

in 1 comment write main thread ends. taken pthread_create man page:

the new thread terminates in 1 of following ways:
[...]
* of threads in process calls exit(3), or main thread performs return main(). causes termination of threads in process.

your main thread needs pthread_join wait sender terminate.