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)

COLOPHON

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