uv_signal_t - Signal handle

[uv_handle_t][] functions also apply.

Signal handles implement Unix style signal handling on a per-event loop bases.

Windows Notes:

Reception of some signals is emulated on Windows:

• SIGINT is normally delivered when the user presses CTRL+C. However, like on

Unix, it is not generated when terminal raw mode is enabled.

• SIGBREAK is delivered when the user pressed CTRL + BREAK.
• SIGHUP is generated when the user closes the console window. On SIGHUP the

program is given approximately 10 seconds to perform cleanup. After that Windows will unconditionally terminate it.

• SIGWINCH is raised whenever libuv detects that the console has been resized.

SIGWINCH is emulated by libuv when the program uses a uvttyt handle to write to the console. SIGWINCH may not always be delivered in a timely manner; libuv will only detect size changes when the cursor is being moved. When a readable [uv_tty_t][] handle is used in raw mode, resizing the console buffer will also trigger a SIGWINCH signal.

• Watchers for other signals can be successfully created, but these signals

are never received. These signals are: SIGILL, SIGABRT, SIGFPE, SIGSEGV, SIGTERM and SIGKILL.

• Calls to raise() or abort() to programmatically raise a signal are not

detected by libuv; these will not trigger a signal watcher.

Unix Notes:

• SIGKILL and SIGSTOP are impossible to catch.
• Handling SIGBUS, SIGFPE, SIGILL or SIGSEGV via libuv results into undefined

behavior.

• SIGABRT will not be caught by libuv if generated by abort(), e.g. through

assert().

• On Linux SIGRT0 and SIGRT1 (signals 32 and 33) are used by the NPTL pthreads

library to manage threads. Installing watchers for those signals will lead to unpredictable behavior and is strongly discouraged. Future versions of libuv may simply reject them.

-- Create a new signal handler
local signal = uv.new_signal()
-- Define a handler function
uv.signal_start(signal, "sigint", function(signame)
  print("got " .. signame .. ", shutting down")
  os.exit(1)
end)