Function glib::source::child_watch_add

pub fn child_watch_add<F>(pid: Pid, func: F) -> SourceId where
    F: FnMut(Pid, i32) + Send + 'static, 

Adds a closure to be called by the main loop the returned Source is attached to when a child process exits.

func will be called when pid exits Sets a function to be called when the child indicated by pid exits, at a default priority, G_PRIORITY_DEFAULT.

If you obtain pid from spawn_async() or g_spawn_async_with_pipes() you will need to pass SpawnFlags::DO_NOT_REAP_CHILD as flag to the spawn function for the child watching to work.

Note that on platforms where GPid must be explicitly closed (see g_spawn_close_pid()) pid must not be closed while the source is still active. Typically, you will want to call g_spawn_close_pid() in the callback function for the source.

GLib supports only a single callback per process id. On POSIX platforms, the same restrictions mentioned for g_child_watch_source_new() apply to this function.

This internally creates a main loop source using g_child_watch_source_new() and attaches it to the main loop context using g_source_attach(). You can do these steps manually if you need greater control.

pid

process id to watch. On POSIX the positive pid of a child process. On Windows a handle for a process (which doesn’t have to be a child).

function

function to call

Returns

the ID (greater than 0) of the event source.