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Sebastian Wick authored
The ro_anonymous_file is an abstraction around anonymous read-only files. os_ro_anonymous_file_create creates such a file with the contents passed in data. Subsequent calls to os_ro_anonymous_file_get_fd return a fd that's ready to be send over the socket. When mapmode is RO_ANONYMOUS_FILE_MAPMODE_PRIVATE the fd is only guaranteed to be mmap-able readonly with MAP_PRIVATE but does not require duplicating the file for each resource when memfd_create is available. RO_ANONYMOUS_FILE_MAPMODE_SHARED may be used when the client must be able to map the file with MAP_SHARED but it also means that the file has to be duplicated even when memfd_create is available. See also: weston commit 76829fc4 wayland commit 905c0a341ddf0a885811d19e2b79c65a3f1d210c Signed-off-by: Sebastian Wick <sebastian@sebastianwick.net>
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