Function ppoll 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn ppoll(
    fds: *mut pollfd,
    nfds: nfds_t,
    tmo_p: *const timespec,
    sigmask: *const sigset_t,
) -> c_int

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/ppoll.html.

Provides applications with a mechanism for multiplexing input/output over a set of file descriptors.

• The tmo_p parameter is the timeout as represented by a timespec struct.
• Passing a null pointer for timeout is equivalent to -1 for timeout to poll.

Note: Uses epoll internally.