SIGSETMASK(3B)                                                  SIGSETMASK(3B)


NAME
     sigsetmask - set current signal mask (4.3BSD)

SYNOPSIS
     #include <signal.h>

     int sigsetmask(int mask);

     mask = sigmask(int signum);

     To use any of the BSD signal routines (kill(3B), killpg(3B),
     sigblock(3B), signal(3B), sigpause(3B), sigsetmask(3B), sigstack(2B),
     sigvec(3B)) you must either

     1) #define _BSD_SIGNALS or _BSD_COMPAT before including <signal.h>, or

     2) specify one of them in the compile command or makefile:

          cc -D_BSD_SIGNALS -o prog prog.c


DESCRIPTION
     sigsetmask sets the current signal mask (those signals that are blocked
     from delivery).  Signals are blocked if the corresponding bit in mask is
     a 1 (numbering the bits from 1 to 32); the macro sigmask is provided to
     construct the mask for a given signum.

     The system quietly disallows SIGKILL, SIGSTOP, or SIGCONT to be blocked.

RETURN VALUE
     The previous set of masked signals is returned.

SEE ALSO
     kill(3B), sigvec(3B), sigblock(3B), sigpause(3B), signal(5).

WARNING (IRIX)
     The 4.3BSD and System V signal facilities have different semantics.
     Using both facilities in the same program is strongly discouraged and
     will result in unpredictable behavior.


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