# sigemptyset(3) [ultrix man page]

sigsetops(3) Library Functions Manual sigsetops(3)Namesigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate signal sets (POSIX)Syntax#include <signal.h> int sigemptyset(set) sigset_t *set; int sigfillset (set) sigset_t *set; int sigaddset(set,sig) sigset_t *set; int sig; int sigdelset(set,sig) sigset_t *set; int sig; int sigismember(set,sig) sigset_t *set; int sig;DescriptionThe functions manipulate signal sets used by the other POSIX signal functions The function initializes the signal set pointed to by the argument set so that all signals are excluded. The function initializes the signal set pointed to by the argument set so that all signals are included. The and functions respectively add and delete the individual signal specified by the value of the argument sig from the signal set pointed to by the argument set. The function tests whether the signal specified by the value of the argument sig is a member of the set pointed to by the argument set.Return ValuesUpon successful completion, the function returns a value of 1 if the specified signal is a member of the set. If it is not a member of the set, a value of 0 is returned. If the or functions fail avalue is returned and errno is set to indicate the reason.-1DiagnosticsThe function will fail and the signal mask will remain unchanged if one of the following occur: [EINVAL] The value of the sig argument is not a valid signal numberSee Alsosigprocmask(3), sigaction(3), sigsuspend(3), sigpending(2) sigsetops(3)

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Namesigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate signal sets (POSIX)Syntax#include <signal.h> int sigemptyset(set) sigset_t *set; int sigfillset (set) sigset_t *set; int sigaddset(set,sig) sigset_t *set; int sig; int sigdelset(set,sig) sigset_t *set; int sig; int sigismember(set,sig) sigset_t *set; int sig;DescriptionThe functions manipulate signal sets used by the other POSIX signal functions The function initializes the signal set pointed to by the argument set so that all signals are excluded. The function initializes the signal set pointed to by the argument set so that all signals are included. The and functions respectively add and delete the individual signal specified by the value of the argument sig from the signal set pointed to by the argument set. The function tests whether the signal specified by the value of the argument sig is a member of the set pointed to by the argument set.Return ValuesUpon successful completion, the function returns a value of 1 if the specified signal is a member of the set. If it is not a member of the set, a value of 0 is returned. If the or functions fail avalue is returned and errno is set to indicate the reason.-1DiagnosticsThe function will fail and the signal mask will remain unchanged if one of the following occur: [EINVAL] The value of the sig argument is not a valid signal numberSee Alsosigprocmask(3), sigaction(3), sigsuspend(3), sigpending(2) sigsetops(3)