c_g_input_stream_read_async

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GInputStream* stream, void* buffer, size_t count, int ioPriority, GCancellable* cancellable, GAsyncReadyCallback callback, void* userData) c_g_input_stream_read_async;

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