uloop: add support for user defined signal handlers

Reuse and extend the existing signal waker pipe mechanism to add user
defined signal handling functionality to uloop.

This commit introduces two new api functions `uloop_signal_add()` and
`uloop_signal_remove()` along with a new structure type `uloop_signal`
to allow adding and removing arbitrary signal handlers.

Registered signal handlers are maintained in a linked list and matched
by their signo member value which allows registering multiple handlers
for the same signal numbers.

Upon registering a new signal handler, the existing handler is saved
in the `uloop_signal` structure. When removing the user defined signal
handler, the original behavior is restored.

The Lua binding has been updated as well to support the new signal
handler mechanism.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 16 insertions, 0 deletions

diff --git a/examples/uloop-example.lua b/examples/uloop-example.lua
index f3aef60..1b73aed 100755
--- a/examples/uloop-example.lua
+++ b/examples/uloop-example.lua
@@ -63,6 +63,22 @@ uloop.timer(
 	end, 2000
 )
 
+-- SIGINT handler
+uloop.signal(function(signo)
+	print(string.format("Terminating on SIGINT (#%d)!", signo))
+
+	-- end uloop to terminate program
+	uloop.cancel()
+end, uloop.SIGINT)
+
+local sig
+sig = uloop.signal(function(signo)
+	print(string.format("Got SIGUSR2 (#%d)!", signo))
+
+	-- remove signal handler, next SIGUSR2 will terminate program
+	sig:delete()
+end, uloop.SIGUSR2)
+
 -- Keep udp_ev reference, events will be gc'd, even if the callback is still referenced
 -- .delete will manually untrack.
 udp_ev = uloop.fd_add(udp, function(ufd, events)