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NAME

       sigblock, siggetmask, sigsetmask, sigmask - manipulate the signal mask

SYNOPSIS

       #include <signal.h>

       int sigblock(int mask);

       int siggetmask(void);

       int sigsetmask(int mask);

       int sigmask(int signum);

DESCRIPTION

       This interface is made obsolete by sigprocmask(2).

       The  sigblock()  system  call adds the signals specified in mask to the
       set of signals currently being blocked from delivery.

       The sigsetmask() system  call  replaces  the  set  of  blocked  signals
       totally  with  a new set specified in mask.  Signals are blocked if the
       corresponding bit in mask is a 1.

       The current set of blocked signals can be obtained using  siggetmask().

       The  sigmask()  macro  is  provided  to  construct the mask for a given
       signum.

RETURN VALUE

       siggetmask() returns the current set of masked signals.

       sigsetmask() and sigblock() return the previous set of masked  signals.

NOTES

       Prototypes  for  these  functions  are only available if _BSD_SOURCE is
       defined before the inclusion of any system header file.

       It is not possible to block SIGKILL or SIGSTOP -  this  restriction  is
       silently imposed by the system.

CONFORMING TO

       4.4BSD.  These  function  calls  appeared in 4.3BSD and are deprecated.
       Use the POSIX signal facilities for new programs.

SEE ALSO

       kill(2), sigprocmask(2), signal(7)