Linux API/linux2021. 5. 21. 17:33

stdin을 통해 입력을 받아 작동하는 프로그램을 쉘에서 실행하고 백드라운드로 돌리니 멈춘다?!

[1] /test
[1]+  Stopped (tty input)        /test


[링크 :]

[링크 :]


아무튼 SIGTTIN이 들어와서 그렇다고 하는데

간단하게는.. 해당 시그널을 무시하면 되는거고..

다른 방법은 좀 더 고민해 봐야 할 듯 -_-


init_shell ()

  /* See if we are running interactively.  */
  shell_terminal = STDIN_FILENO;
  shell_is_interactive = isatty (shell_terminal);

  if (shell_is_interactive)
      /* Loop until we are in the foreground.  */
      while (tcgetpgrp (shell_terminal) != (shell_pgid = getpgrp ()))
        kill (- shell_pgid, SIGTTIN);

      /* Ignore interactive and job-control signals.  */
      signal (SIGINT, SIG_IGN);
      signal (SIGQUIT, SIG_IGN);
      signal (SIGTSTP, SIG_IGN);
      signal (SIGTTIN, SIG_IGN);
      signal (SIGTTOU, SIG_IGN);
      signal (SIGCHLD, SIG_IGN);

      /* Put ourselves in our own process group.  */
      shell_pgid = getpid ();
      if (setpgid (shell_pgid, shell_pgid) < 0)
          perror ("Couldn't put the shell in its own process group");
          exit (1);

      /* Grab control of the terminal.  */
      tcsetpgrp (shell_terminal, shell_pgid);

      /* Save default terminal attributes for shell.  */
      tcgetattr (shell_terminal, &shell_tmodes);

[링크 :]


Macro: int SIGTTINA process cannot read from the user’s terminal while it is running as a background job. When any process in a background job tries to read from the terminal, all of the processes in the job are sent a SIGTTIN signal. The default action for this signal is to stop the process. For more information about how this interacts with the terminal driver, see Access to the Terminal.

[링크 :]

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Posted by 구차니

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