SYSIFCOPT Syntax:

1? SYSIFCOPT(
1.1! *IFS64IO (2) 
1.1 *NOIFSIO (1) 
1.1?
1.1 *IFSIO
1.2! *NOASYNCSIGNAL (3) 
1.2?
1.2 *ASYNCSIGNAL (3) 
1.3 )