sgetmask, ssetmask - manipulation of signal mask (obsolete)
Standard C library (
libc,
-lc)
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
[[deprecated]] long syscall(SYS_sgetmask, void);
[[deprecated]] long syscall(SYS_ssetmask, long newmask);
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.
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 option.
These system calls are Linux-specific.
These system calls are unaware of signal numbers greater than 31 (i.e.,
real-time signals).
These system calls do not exist on x86-64.
It is not possible to block
SIGSTOP or
SIGKILL.
sigprocmask(2),
signal(7)