Contents
Does SIGINT kill the process?
SIGINT is the signal sent when we press Ctrl+C. The default action is to terminate the process. However, some programs override this action and handle it differently.
Can SIGINT be handled?
There are several ways to handle abortion of shell scripts when SIGINT is received while a foreground child runs: Not only the program called will exit, but the calling (the script-executing) shell.
Can a process ignore SIGKILL?
The SIGKILL signal is sent to a process to cause it to terminate immediately (kill). Processes that are in the blocked state will not die until they wake up again. The init process is special: It does not get signals that it does not want to handle, and thus it can ignore SIGKILL.
Why is SIGINT not propagated to child process when sent to its?
SIGINT is delivered to the cat process, which dies. Because it was the only process on the terminal, the session ends, just as if you’d said “exit” at a shell prompt. In effect cat was your shell for a while. There’s no reason to propagate the SIGINT to the child.
How are signals sent to processes in process group 12345?
When you type a signal-generating key sequence (e.g., Ctrl + C ), the signal is sent to all processes that are attached to (associated with) the terminal. There is no such mechanism for signals generated by kill. will send the signal to all processes in process group 12345; see kill (1) and kill (2) .
How does Ctrl + C send a SIGINT?
The first thing is to understand how CTRL + C works. When you press CTRL + C, your terminal emulator sends an ETX character (end-of-text / 0x03). The TTY is configured such that when it receives this character, it sends a SIGINT to the foreground process group of the terminal.
When to send SIGINT to foreground process group?
The POSIX specification says that when INTR is received, it should send a SIGINT to the foreground process group of that terminal. What is the foreground process group?