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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.

SEE ALSO

   sigprocmask(2), signal(7)

COLOPHON

   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.



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