DragonFly On-Line Manual Pages


SIGSETOPS(3)	      DragonFly Library Functions Manual	  SIGSETOPS(3)

NAME

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

LIBRARY

Standard 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(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. 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, 0 otherwise. The other functions return 0.

ERRORS

Currently no errors are detected.

SEE ALSO

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

STANDARDS

These functions are defined by IEEE Std 1003.1-1988 (``POSIX.1''). DragonFly 3.7 June 4, 1993 DragonFly 3.7