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CentOS 7.0 - man page for sgetmask (centos section 2)

SGETMASK(2)						     Linux Programmer's Manual						       SGETMASK(2)

NAME
sgetmask, ssetmask - manipulation of signal mask (obsolete)
SYNOPSIS
long sgetmask(void); long ssetmask(long newmask); Note: There are no glibc wrappers for these system calls; see NOTES.
DESCRIPTION
These system calls are obsolete. Do not use them; use sigprocmask(2) instead. sgetmask() returns the signal mask of the calling process. ssetmask() sets the signal mask of the calling process to the value given in newmask. The previous signal mask is returned. The signal masks dealt with by these two system calls are plain bit masks (unlike the sigset_t used by sigprocmask(2)); use sigmask(3) to create and inspect these masks.
RETURN VALUE
sgetmask() always successfully returns the signal mask. ssetmask() always succeeds, and returns the previous signal mask.
ERRORS
These system calls always succeed.
CONFORMING TO
These system calls are Linux-specific.
NOTES
Glibc does not provide wrappers for these obsolete system calls; in the unlikely event that you want to call them, use syscall(2). These system calls are unaware of signal numbers greater than 31 (i.e., real-time signals). It is not possible to block SIGSTOP or SIGKILL.
SEE ALSO
sigprocmask(2), signal(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2012-07-13 SGETMASK(2)