epoll: add support for polling on epoll file descriptors #2074
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In addition, -EINVAL is now returned when the file descriptor being added, deleted, or modified is the same as the epoll file descriptor on which epoll_ctl() is called.
This minimizes the number of memory accesses needed to retrieve the epoll struct pointer and the epoll type.
The return value indicates whether any of the invoked handlers consumed the events. This feature will be used in the next commit.
francescolavra
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I amended the code so that a polling syscall on a set of file descriptors that contains an epoll instance properly returns when the epoll instance becomes readable. |
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In addition, epoll_ctl() now returns -EINVAL if called on a non-epoll file descriptor, or if the file descriptor being added, deleted, or modified is the same as the epoll file descriptor on which epoll_ctl() is called.
Closes #1192.