ref: d7f0e25b97d041a2645e2d90f6033949b01c7cc6
dir: /src/libc/arch/posix/signal.c/
#include <stddef.h>
#include <signal.h>
#include <sys.h>
#undef signal
void
(*signal(int signum, void (*func)(int)))(int)
{
struct sigaction sa = {
.sa_handler = func,
};
if (_sigaction(signum, &sa, &sa) < 0)
return SIG_ERR;
return sa.sa_handler;
}