Handling signals like the big boys

[tkks]

Hi All,

I am still trying to write a custom shell and I want to handle SIGINT and SIGTSTP, so I assigned them handlers:



signal(SIGINT, sigint_handler);
signal(SIGTSTP, sigtstp_handler);


The problem is that I get the user input with fgets() :



fgets(lineSize, MAX_LINE_SIZE, stdin);


When waiting for the user input if I press CTRL+z or CTRL+c the handlers will not be invoked until I press ENTER.

And when I am waiting on a running a command like so:



pID=fork();
if(pID ==-1){
printf("error...");
return;
} else if(pID == 0) {
execvp(args[0], args);
printf("error...");
return;
} else {
wpID=wait(&status);
if(wpID == -1){
printf("error...");
}
return;
}


And I press CTRL+z or CTRL+c the handlers are not invoked at all and the program gets stuck.

Anybody has an idea what the problem might be?

Thanks a lot