/* protable signal() like */
#include <signal.h>
/* Portable signal() from R.Stevens,
* modified to reset the handler */
void (*Signal(int signo, void (*func)(int)))(int)
{
struct sigaction act, oact;
act.sa_handler = func;
sigemptyset(&act.sa_mask);
act.sa_flags = 0; /* So if set SA_RESETHAND is cleared */
if (signo == SIGALRM)
{
#ifdef SA_INTERRUPT
act.sa_flags |= SA_INTERRUPT; /* SunOS 4.x */
#endif
}
else
{
#ifdef SA_RESTART
act.sa_flags |= SA_RESTART; /* SVR4, 4.4BSD, Linux */
#endif
}
if (sigaction(signo, &act, &oact) == -1)
return SIG_ERR;
return (oact.sa_handler);
}
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