MirOS Manual: sigaddset(3), sigdelset(3), sigemptyset(3), sigfillset(3), sigismember(3), sigsetops(3)

SIGSETOPS(3)               BSD 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(const 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 sig-
     fillset() 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.

     sigfillset() initializes a signal set to contain all signals.

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

     sigdelset() deletes the specified signal signo from the signal set.

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

RETURN VALUES

     The sigismember() function returns 1 if the signal is a member of the set
     and 0 otherwise. The other functions return 0 upon success. A -1 return
     value indicates an error occurred and the global variable errno is set to
     indicate the reason.

ERRORS

     These functions may fail if one of the following occurs:

     [EINVAL]      The specified signal signo is not a valid signal number.

SEE ALSO

     kill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)

STANDARDS

     These functions are defined by IEEE Std 1003.1-1990 ("POSIX").

MirOS BSD #10-current            June 4, 1993                                1

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