C - Processes in linux handle with any signal - c

Question

I'm writing code that have process who have to handle with any signal i gave him. I read that i should do something like that
void signalHandler(int sig_num)
{
// some stuff
}
//My process
int i;
for (i = 1; i <= 64; i++)
signal(i, signalHandler);
Is this correct solution ??

Answer 1

Although #Dylan's solution seems good and it is but it poses the a common problem and that is compatibility issue with signal function. It is hence recommended that you use sigaction always. Here is an example
#include <stdio.h>
#include <signal.h>
static void handler(int signo){
write(stdout, &signo, sizeof(int));
}
int main() {
struct sigaction sa;
sa.sa_handler = handler;
int i;
for (i = 1; i <= 64; i++) {
sigaction(i, &sa, NULL);
}
while(1);
return 0;
}
Try to avoid the use of signal as much as possible
Never use any function which are not Reentrant or not Async-signal-safe functions in signal handler like printf
Check the list of allowed functions in signal handler from here
POSIX.1-2004 (also known as POSIX.1-2001 Technical Corrigendum 2)
requires an implementation to guarantee that the following functions
can be safely called inside a signal handler:

Answer 2

You are on the right track if you want to handle signals 1 through 64 with the same signal handler. This test program will handle signals 1 through 64 by printing out its number.
#include <stdio.h>
#include <signal.h>
void signalHandler(int sig_num)
{
printf("Signal %d caught!\n", sig_num);
}
int main(int argc, char const *argv[])
{
//My process
int i;
for (i = 1; i <= 64; i++) {
signal(i, signalHandler);
}
while (1);
return 0;
}
For example, when you press CTRL+C while this program is running. The kernel sends signal 2 SIGINT to the program, and calls signalHandler(2). This program prints "Signal 2 caught!"
Post-Facepalm edit: this program obviously needs to be terminated with a kill -9 command........