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

NAME
       sgetmask, ssetmask - manipulation of signal mask (obsolete)

SYNOPSIS
       #include <sys/syscall.h>      /* Definition of SYS_* constants */
       #include <unistd.h>

       long syscall(SYS_sgetmask, void);
       long syscall(SYS_ssetmask, long newmask);

       Note: glibc provides no wrappers for these functions, necessitating the use of syscall(2).

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.

VERSIONS
       Since Linux 3.16, support for these system calls is optional, depending on whether the kernel was built with the CONFIG_SGETMASK_SYSCALL option.

CONFORMING TO
       These system calls are Linux-specific.

NOTES
       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.

SEE ALSO
       sigprocmask(2), signal(7)

Linux                                                                          2021-03-22                                                                    SGETMASK(2)