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cunixsignalsterminal-emulator

\033 Prompt in unix

I wrote a signal handler that prints a line from buffer, it first removes the previous prompt, print a line and prints the prompt again at the end of the screen. here is my handler.

void print(int param)
{
  int c;
  signal(SIGALRM, print);
  printf("\b\b\b\b\b\b\b\b\b\b\033[0K");
  print_line();
  printf("\033[7m--HEY--\033[0m");
}

This handler is doing everything I wanted except that I could not see the prompt at the end of the screen. I do not understand why I am not able to see the prompt that?

Solution

  • Standard output is usually line buffered. End with a \n character, or flush explicitly like this:

    fflush(stdout);