# include & lt; Signal. H> 
# include & lt; Unistd. H> 
# include & lt; stdio.h> 

Int main () {
Sigset_t set; 
Int count=10; 
Sigemptyset (& amp; The set);//to empty all signal collection 
Sigaddset (& amp; The set of SIGINT);//add to block signals 
Sigprocmask (SIG_BLOCK, & amp; Set to NULL);//set the blocking signal 

While (count) {
Printf (" don 't disturb me (% d) \ n ", the count --); 
sleep(1); 
} 
Sigprocmask (SIG_UNBLOCK, & amp; Set to NULL);//unblocked 
Sleep (10); 
Printf (" you did not disturb me! \ n "); 
return 0; 
} 

Shell on the results are as follows, don't understand why, after click Ctrl C signal doesn't appear the last sentence is what? :

CodePudding user response:

SIGSTOP/SIGKILL this two signals can't block and block, should be a Ctrl + C directly out of the process, so will not print