Query: sigdelset
OS: netbsd
Section: 3
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SIGSETOPS(3) BSD Library Functions Manual SIGSETOPS(3)NAMEsigemptyset, sigfillset, sigaddset, sigdelset, sigismember -- manipulate signal setsLIBRARYStandard C Library (libc, -lc)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);DESCRIPTIONThese 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. 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 signo to the signal set. The sigdelset() function deletes the specified signal signo from the signal set. The sigismember() function returns whether a specified signal signo is contained in the signal set. sigemptyset() and sigfillset() are provided as macros, but actual functions are available if their names are undefined (with #undef name).RETURN VALUESThe 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 return value indicates an error occurred and the global variable errno is set to indicate the reason.ERRORSThese functions could fail if one of the following occurs: [EINVAL] signo has an invalid value.SEE ALSOkill(2), sigaction(2), sigsuspend(2), signal(7)STANDARDSThese functions conform to ISO/IEC 9945-1:1990 (``POSIX.1'').BSDJune 4, 1993 BSD