SGETMASK(2) Linux Programmer's Manual SGETMASK(2)
sgetmask, ssetmask - manipulation of signal mask (obsolete)
long ssetmask(long newmask);
Note: There are no glibc wrappers for these system calls; see NOTES.
These system calls are obsolete. Do not use them; use sigprocmask(2)
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.
sgetmask() always successfully returns the signal mask. ssetmask()
always succeeds, and returns the previous signal mask.
These system calls always succeed.
Since Linux 3.16, support for these system calls is optional, depending
on whether the kernel was built with the CONFIG_SGETMASK_SYSCALL
These system calls are Linux-specific.
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.,
These system calls do not exist on x86-64.
It is not possible to block SIGSTOP or SIGKILL.
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Linux 2017-09-15 SGETMASK(2)