How can Unix pipes be used between main process and thread?

Question

I am trying to channel data via pipes whenever a signal arrives from a thread to the main process.

Is this possible?
How can this be done?

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The pr

Answer 1

Yes its possible through pipes.

Step one call pipe to get a pipe:

  #include 


  int main(...)
  {

    int fileDescriptors[2];
    pipe(fileDescriptors);

Step 2 pass the fileDescriptors[0] to the main process, and fileDescriptors1 to the thread. In Main you wait for the pipe to be written to to by reading from fileDescriptors[0]

    ...
    char msg[100];
    read(fileDescriptors[0], msg, 100);  // block until pipe is read
  }

Step 3, from your thread write to fileDescritpors1 when the signal occurs

 void signal_handler( int sig )
 {
     // Write to the file descriptor
     if (sig == SIGKILL)
     {
         const char* msg = "Hello Mama!";
         write(fileDescriptors[1], msg, strlen(msg));
     }
 }