sigblock

SIGBLOCK(2)		  Linux Programmer’s Manual		  SIGBLOCK(2)



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  corre-
       sponding 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 BSD 4.3 and  are  deprecated.
       Use the POSIX signal facilities for new programs.

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



Linux 1.3			  1995-08-31			  SIGBLOCK(2)