Create a SocketSource that will be dispatched upon delivery of the UNIX
signal signum.
In GLib versions before 2.36, only `SIGHUP`, `SIGINT`, `SIGTERM` can be monitored. In GLib 2.36, `SIGUSR1` and `SIGUSR2` were added.
Note that unlike the UNIX default, all sources which have created a watch will be dispatched, regardless of which underlying thread invoked SignalSource.
For example, an effective use of this function is to handle `SIGTERM` cleanly; flushing any outstanding files, and then calling
g_main_loop_quit (). It is not safe to do any of this a regular UNIX signal handler; your handler may be invoked while malloc
or another library function is running, causing reentrancy if you attempt to use it from the handler. None of the GLib/GObject API is
safe against this kind of reentrancy.
The interaction of this source when combined with native UNIX functions like sigprocmask is not defined.
The source will not initially be associated with any MainContext and must be added to one with attach before it will be executed.
| signum |
A signal number |
|
A newly created SocketSource |