SIGSETOPS(3)	    UNIX Programmer's Manual	     SIGSETOPS(3)



NAME
     sigemptyset, sigfillset, sigaddset, sigdelset, sigismember -
     manipulate signal sets

SYNOPSIS
     #include <signal.h>

     sigemptyset(set)
     _s_i_g_s_e_t__t *_s_e_t;

     sigfillset(set)
     _s_i_g_s_e_t__t *_s_e_t;

     sigaddset(set, signo)
     _s_i_g_s_e_t__t *_s_e_t;
     _i_n_t _s_i_g_n_o;

     sigdelset(set, signo)
     _s_i_g_s_e_t__t *_s_e_t;
     _i_n_t _s_i_g_n_o;

     sigismember(set, signo)
     _s_i_g_s_e_t__t *_s_e_t;
     _i_n_t _s_i_g_n_o;

DESCRIPTION
     These functions manipulate signal sets stored in a _s_i_g_s_e_t__t
     . Either sigemptyset or sigfillset must be called for every
     object of type _s_i_g_s_e_t__t before any other use of the object.

     The sigemptyset function initializes a signal set to be
     empty.

     The sigfillset function initializes a signal set to contain
     all signals.

     The sigaddset function adds the specified signal _s_i_g_n_o to
     the signal set.

     The sigdelset function deletes the specified signal _s_i_g_n_o
     from the signal set.

     The sigismember function returns whether a specified signal
     _s_i_g_n_o is contained in the signal set.

     These functions are provided as macros in the include file
     <_s_i_g_n_a_l._h>.  Actual functions are available if their names
     are undefined (with #undef name).

RETURN VALUES
     The sigismember function returns 1 if the signal is a member
     of the set, 0 otherwise.  The other functions return 0.



Printed 11/26/99	September 3, 1997			1






SIGSETOPS(3)	    UNIX Programmer's Manual	     SIGSETOPS(3)



ERRORS
     Currently no errors are detected.

SEE ALSO
     kill(2), sigaction(2), sigsuspend(2)

STANDARDS
     These functions are defined by IEEE Std1003.1-1988
     (``POSIX'').














































Printed 11/26/99	September 3, 1997			2