sigmask

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)