Function ualarm 

#[unsafe(no_mangle)]
pub extern "C" fn ualarm(
    usecs: useconds_t,
    interval: useconds_t,
) -> useconds_t

👎Deprecated

See https://pubs.opengroup.org/onlinepubs/009695399/functions/ualarm.html.

Deprecation

The ualarm() function was marked obsolescent in the Open Group Base Specifications Issue 6, and removed in Issue 7.