sigaction sigaltstack sigblock siggetmask sigmask signal sigpause
sigpending sigprocmask sigreturn sigsetmask sigsuspend sigvec socket
socketcall socketpair ssetmask statfs stime stty swapoff swapon
-syscalls sysctl sysfs sysinfo syslog time times
-ulimit umount uname ustat utime utimes vfork vhangup wait3
+syscalls sysctl sysfs sysinfo times
+ulimit umount uname ustat vfork vhangup wait3
wait4 write writev
4) In the spec but not implemented: