Child.childWatchAdd

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 g_spawn_async() or g_spawn_async_with_pipes() you will need to pass #G_SPAWN_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.

struct Child
static
uint
childWatchAdd
(
GPid pid
,
GChildWatchFunc funct
,
void* data
)

Parameters

pid GPid

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).

funct GChildWatchFunc

function to call

data void*

data to pass to @function

Return Value

Type: uint

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

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