Question

I need to handle some signal with sigaction, but when I compile my code I get this error:

warning: assignment from incompatible pointer type

the code is:

struct sigaction hup_act;
...
hup_act.sa_flags=SA_SIGINFO;
hup_act.sa_sigaction = sighupHandler;
sigaction(SIGHUP, &hup_act, NULL);

Warning is on hup_act.sa_sigaction assignment. This warning causes a segmentation fault when I send sighup to my application.

Answer 1

If SA_SIGINFOis set in struct sigaction‘s member sa_flags use a method of type

void signalhandler(int, siginfo_t *, void *);

as handler function to be assigned to struct sigaction‘s member sa_sigaction

else use a method of type

void signalhandler(int);

as handler function to be assigned to struct sigaction‘s member sa_handler.