NAME

       sgetmask, ssetmask - manipulation of signal mask (obsolete)

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

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

       [[deprecated]] long syscall(SYS_sgetmask, void);
       [[deprecated]] long syscall(SYS_ssetmask, long newmask);

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.

STANDARDS

       Linux.

HISTORY

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

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)