//*****esh-sys-utils.h******//
/* Signal handler prototype */
typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);




//*****esh-sys-utils.c******//

/* Install signal handler for signal 'sig' */
void
esh_signal_sethandler(int sig, sa_sigaction_t handler)
{
    sigset_t emptymask;

    sigemptyset(&emptymask);
    struct sigaction sa = {
        .sa_sigaction = handler,
        /* do not block any additional signals (besides 'sig') when
         * signal handler is entered. */
        .sa_mask = emptymask,
        /* restart system calls when possible */
        .sa_flags = SA_RESTART
    };

    if (sigaction(sig, &sa, NULL) != 0)
        esh_sys_fatal_error("sigaction failed for signal %d", sig);
}