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NAME    [Toc]    [Back]

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

LIBRARY    [Toc]    [Back]

     Standard C Library (libc, -lc)

SYNOPSIS    [Toc]    [Back]

     #include <signal.h>

     sigemptyset(sigset_t *set);

     sigfillset(sigset_t *set);

     sigaddset(sigset_t *set, int signo);

     sigdelset(sigset_t *set, int signo);

     sigismember(const sigset_t *set, int signo);

DESCRIPTION    [Toc]    [Back]

     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 signals.

     The sigaddset() function adds the specified signal signo to the signal

     The sigdelset() function deletes the specified signal signo from the signal

     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

RETURN VALUES    [Toc]    [Back]

     The sigismember() function returns 1 if the signal is a member of the
     set, 0 otherwise.	The other functions return 0.

ERRORS    [Toc]    [Back]

     Currently no errors are detected.

SEE ALSO    [Toc]    [Back]

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

STANDARDS    [Toc]    [Back]

     These functions are defined by IEEE Std 1003.1-1988 (``POSIX.1'').

FreeBSD 5.2.1			 June 4, 1993			 FreeBSD 5.2.1
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