Function sigset 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn sigset(
    sig: c_int,
    func: Option<extern "C" fn(c_int)>,
) -> Option<extern "C" fn(c_int)>

👎Deprecated

See https://pubs.opengroup.org/onlinepubs/9699919799/functions/sighold.html.

Modifies signal dispositions.

Upon success, returns SIG_HOLD if the signal had been blocked and the signal’s previous disposition if it had not been blocked. Upon failure, returns SIG_ERR and sets errno to indicate the error.

Deprecated

Present in issue 7. Removed in issue 8.

Use of this function is unspecified in a multi-threaded process.

sigaction() should be used instead.

Implementation

Calls sigaction() internally.