Program received signal SIGPIPE, Broken pipe

Question

I write a client program based on posix sockets. The program creates multiple threads and is going to lock the server. But during debug in gdb time the program gives an info

Answer 1

The process received a SIGPIPE. The default behaviour for this signal is to end the process.

A SIGPIPE is sent to a process if it tried to write to a socket that had been shutdown for writing or isn't connected (anymore).

To avoid that the program ends in this case, you could either

• make the process ignore SIGPIPE

  #include 
  
  int main(void)
  {
    sigaction(SIGPIPE, &(struct sigaction){SIG_IGN}, NULL);
  
    ...
  

  or

• install an explicit handler for SIGPIPE (typically doing nothing):

  #include 
  
  void sigpipe_handler(int unused)
  {
  }
  
  int main(void)
  {
    sigaction(SIGPIPE, &(struct sigaction){sigpipe_handler}, NULL);
  
    ...
  

In both cases send*()/write() would return -1 and set errno to EPIPE.