Programming

Hi everyone,

Is there a variable or built in function in the Unix env. for me to obtain the name of a signal that is caught? As far as I understand only a numeric value of the signal is returned to the handler.

For example:

Code:

void handler (int signum)
            {
                    signal(SIGINT, handler);
                    cout<<"Signal: "<<signum<<endl;
            }

            int main (int argc, char* argv[])
            {
                  signal(SIGINT, handler);
                  for ( ;; )
                      pause();
            }

with the above code, only the number printed. I would like to get the name of the signal... i'm hoping that there is a built-in function for me to get this so that i won't need to manually code the conversion part in.

Also, do i need to have ( signal(SIGINT, handler); ) and a handler function set for EVERY signal that I want to catch? Is there a way for me to catch all the signals using one handler? would the use of sigaction() and sigprocmask() satisfy my requirements?

Thank you for your time and help.

There is nothing such as 'name of the signal'. I guess you are refferring to the defined macros for the signal numbers.

#define SIGHUP 1 /* hangup */
#define SIGINT 2 /* interrupt (rubout) */
#define SIGQUIT 3 /* quit (ASCII FS) */

There are couple of ways to find out the description of the caught signal. One can call below functions to get the description:

void psignal(int sig, const char *s);
void psiginfo(siginfo_t *pinfo, char *s);

These functions are defined in <siginfo.h>

Coming to your second question:

As per my understanding, there is no generic function to catch all the signals. It is necessary to specify the signal you want handle.

Hope this helps.

Thank you for your suggestion. i'll try those functions out and see.

any other suggestion would be greatly appreciated.

Cheers!