sigsetops(3) - NetBSD Manual Pages

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


NAME

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


SYNOPSIS

     #include <signal.h>

     int
     sigemptyset(sigset_t *set);

     int
     sigfillset(sigset_t *set);

     int
     sigaddset(sigset_t *set, int signo);

     int
     sigdelset(sigset_t *set, int signo);

     int
     sigismember(sigset_t *set, int signo);


DESCRIPTION

     These functions manipulate signal sets stored in a sigset_t. Either
     sigemptyset() or sigfillset() must be called for every object of type
     sigset_t before any other use of the object.  sigemptyset() and
     sigfillset() are provided as macros, but actual functions are available
     if their names are undefined (with #undef name).

     The sigemptyset() function initializes a signal set to be empty.

     The sigfillset() function initializes a signal set to contain all sig-
     nals.

     The sigaddset() function adds the specified signal signo to the signal
     set.

     The sigdelset() function deletes the specified signal signo from the sig-
     nal set.

     The sigismember() function returns whether a specified signal signo is
     contained in the signal set.

     These functions are provided as macros in the include file <signal.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, a 0 otherwise.  The other functions return 0 upon success.  A -1 re-
     turn value indicates an error occurred and the global variable errno is
     set to indicated the reason.


ERRORS

     These functions could fail if one of the following occurs:

     [EINVAL]      signo has an invalid value.


SEE ALSO

     kill(2),  sigaction(2),  sigsuspend(2)


STANDARDS

     These functions conform to IEEE Std1003.1-1990 (``POSIX'').