SIGSETOPS(3) BSD Programmer's Manual SIGSETOPS(3)
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate signal sets
#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);
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.
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.
These functions may fail if one of the following occurs: [EINVAL] The specified signal signo is not a valid signal number.
kill(2), sigaction(2), sigpending(2), sigprocmask(2), sigsuspend(2)
These functions are defined by IEEE Std 1003.1-1990 ("POSIX"). MirOS BSD #10-current June 4, 1993 1
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