sigfillset()--Initialize and Fill Signal Set

#include <signal.h>

int sigfillset( sigset_t *set );

The sigfillset() function is part of a family of functions that manipulate signal sets. Signal sets are data objects that let a thread keep track of groups of signals. For example, a thread might create a signal set to record which signals it is blocking, and another signal set to record which signals are pending. Signal sets are used to manipulate groups of signals used by other functions (such as sigprocmask()) or to examine signal sets returned by other functions (such as sigpending()).

sigfillset() initializes the signal set specified by set to a complete set. That is, the set includes all supported signals (see Figure 1-2).

Parameters

*set

(Input) A pointer to a signal set.

Return Value

0

sigfillset() was successful.

Error Conditions

The sigfillset() function does not return an error.

Related Information

• The <signal.h> file (see Header Files for UNIX-Type Functions)

• sigaction()--Examine and Change Signal Action

• sigaddset()--Add Signal to Signal Set

• sigdelset()--Delete Signal from Signal Set

• sigemptyset()--Initialize and Empty Signal Set

• sigismember()--Test for Signal in Signal Set

• sigprocmask()--Examine and Change Blocked Signals

• sigpending()--Examine Pending Signals

• sigsuspend()--Wait for Signal

• sigtimedwait()--Synchronously Accept a Signal for Interval of Time

• sigwait()--Synchronously Accept a Signal

• sigwaitinfo()--Synchronously Accept a Signal and Signal Data

Example

The following example initializes a set of signals to the complete set:

#include <stdio.h>
#include <unistd.h>
#include <signal.h>

int main( int argc, char *argv[] ) {

    sigset_t sigset;

    /*
     * Blocking all signals ensures that the signal
     * handling action for the signals in the set is
     * not taken until the signals are unblocked.
     */

    sigfillset( &sigset );
    sigprocmask( SIG_SETMASK, &sigset, NULL );

    printf( "before kill()\n" );
    kill( getpid(), SIGUSR2 );
    printf( "after kill()\n" );

    return( 0 );
}

Output:

    before kill()
    after kill()