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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.

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

     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).

     These system calls do not exist on x86-64.

     It is not possible to block SIGSTOP or SIGKILL.