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.