Constant SYS_POLL 

pub const SYS_POLL: usize = 460; // 460usize

Poll multiple file descriptors for events.

• fds_ptr: pointer to an array of PollFd structs
• nfds: number of file descriptors in the array
• timeout_ms: maximum wait time in milliseconds (-1 = infinite, 0 = return immediately)

Returns the number of file descriptors with events, or 0 on timeout.