centos man page for sys_sigprocmask

SYS_SIGPROCMASK(9)						   Driver Basics						SYS_SIGPROCMASK(9)

NAME
       sys_sigprocmask - examine and change blocked signals

SYNOPSIS
       long sys_sigprocmask(int how, old_sigset_t __user * nset, old_sigset_t __user * oset);

ARGUMENTS
       how
	   whether to add, remove, or set signals

       nset
	   signals to add or remove (if non-null)

       oset
	   previous value of signal mask if non-null

DESCRIPTION
       Some platforms have their own version with special arguments; others support only sys_rt_sigprocmask.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							SYS_SIGPROCMASK(9)