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When a <gpu> node is present in the VFS, the plugin opens a Gpu::Connection for each open call to the 'gpu' node and installs a completion signal handler. A read only to the fd returned only comes back if a completion signal has been received between two read transctions to the fd. For now the Gpu::Connections can be retrieved by calling the 'vfs_gpu_connection(unsigned long id)' function. The id can be obtained using 'stat' on the 'gpu' device and is located in the inode (st_ino) field of the stat buffer. issue #4380
This directory is a source-code repository containing Genode-specific services and applications. In contrast to the components that come with the 'os' repository, programs contained in 'gems' are able to leverage the functionalities provided by higher-level repositories such as 'libports'. To use the 'gems' repository, make sure to also add those repositories to your build configuraion.