Hanging commands interrupted by SIGINT

[andreaulicna]

• 135

  • Added a new signal handler handle_sigint_hanging_command, using SIGUSR2, for a case when a hanging command gets interrupted by SIGINT

  • Example commands

    cat
    sort

  • Child flow:

  • SIGUSR2 is registered and makes the child exit with 130

  • SIGINT is ignored

  • Parent flow:

  • SIGUSR2 is ignored

  • SIGINT is registered and then it:

    • prints a \n
    • sets g_signal to SIGUSR2 so that it can be checked at the end of wait_for_pipeline and the exit_status set to 130 if needed
    • sends SIGUSR2 to all process, making the child to exit with 130

• 133

  • functions used only within one file set as static
  • general cleanup and some documentation tweaks

• Other notes

  • Moved main.c into the main folder
  • Removed print.c from compilation but kept the file in debug directory to always have access to the debugging minishell_loop and print functions
  • Edited free.c to separate actual freeing and setting variables that are used repeatedly to NULL before a new minishell_loop
  • Edited free_pipe_child in free_pipe.c to get rid of the last bits of still reachable leaks (for multiple pipes)
  • Added checks for heredoc only across expander (old_cmd != NULL) and exec (content->cmd[0] == NULL)