Question

Hi
I have a signal handler defined in one file, from where the signal is generated. I have defined a “static struct sigaction” to define a signal handler which is non-static.

We know using “static” we can also put scope limitation to one single file, so using this technique can we restrict the signal handler to catch signals from only the file in which it is defined?

My “file” – File1, which is linked with other file – File2, File2 can generate signals, which should not be caught by File1 handler. So can i achieve this, if i put “static struct sigaction” in File1?

enter code here
File1.c

static struct sigaction;
void sigHandler(int sig); // also a handler for SIG_NO but should catch signals generated for only File1.c (sig handler is non-static)

File2.c
kill(getpid(), SIG_NO)

File1.c and File2.c are linked together.

Answer 1

It really doesn’t matter where you declare / define the handler. If you get to install the handler, it handles ALL the signals of that type received by the process.

So, no matter the scope and linkage of your identifiers, once you install the handler it handles everything.