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Initialize a set to contain no signals
#include <signal.h>
int sigemptyset( sigset_t *set );
- set
- A pointer to the sigset_t object that you want to
initialize.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The sigemptyset() function initializes set to
contain no signals.
- 0
- Success.
- -1
- An error occurred
(errno is set).
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
void print( sigset_t set, int signo )
{
printf( "Set %8.8lx. Signal %d is ", set, signo );
if( sigismember( &set, signo ) )
printf( "a member.\n" );
else
printf( "not a member.\n" );
}
int main( void )
{
sigset_t set;
sigemptyset( &set );
print( set, SIGINT );
sigfillset( &set );
print( set, SIGINT );
sigdelset( &set, SIGINT );
print( set, SIGINT );
sigaddset( &set, SIGINT );
print( set, SIGINT );
return EXIT_SUCCESS;
}
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
kill(),
pthread_sigmask(),
raise(),
sigaction(),
sigaddset(),
sigdelset(),
sigfillset(),
sigismember(),
signal(),
sigpending(),
sigprocmask()
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