How to set sa_mask in sigset_t?

Question

gcc (GCC) 4.6.0 C89

I have a signal handler declared as follows:

/* Setup signal handler */ struct sigaction new_action; new_action.sa_handler = g_signal_handler; new_action.sa_flags = SA_ONSTACK; if(sigaction(SIGINT, &new_action, NULL) == -1) { fprintf(stderr, "Failed to setup signal handlers."); return -1; } 

When I ran my code through valgrind ie valgrind --leak-check=full , it found the following error:

 ==5206== Syscall param rt_sigaction(act->sa_mask) points to uninitialised byte(s) ==5206== at 0x347A435455: __libc_sigaction (in /lib64/libc-2.14.so) 

So, looking at the manual pages, I decided to do this: just check:

new_action.sa_mask = SA_NODEFER;

However, just give me the following error:

 error: incompatible types when assigning to type '__sigset_t' from type 'int' 

Thanks so much for any suggestions,

Answer 1

Try the following:

 /* Signals blocked during the execution of the handler. */ sigemptyset(&new_action.sa_mask); sigaddset(&new_action.sa_mask, SIGINT); 

The sa_mask field allows us to specify a set of signals that arent allowed to interrupt the execution of this handler. In addition, the signal that caused the handler to be called is automatically added to the process signal mask.