sigemptyset()
Initialize a set to contain no signals
Synopsis:
#include <signal.h>
int sigemptyset( sigset_t *set );
Arguments:
- set
- A pointer to the sigset_t object that you want to initialize.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The sigemptyset() function initializes set to contain no signals.
Returns:
- 0
- Success.
- -1
- An error occurred (errno is set).
Examples:
#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; }
Classification:
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Yes |
Signal handler | Yes |
Thread | Yes |