#include <signal.h>
#include <type_traits>
#ifndef SIG_DFL
#error SIG_DFL not defined
#endif
#ifndef SIG_ERR
#error SIG_ERR not defined
#endif
#ifndef SIG_IGN
#error SIG_IGN not defined
#endif
#ifndef SIGABRT
#error SIGABRT not defined
#endif
#ifndef SIGFPE
#error SIGFPE not defined
#endif
#ifndef SIGILL
#error SIGILL not defined
#endif
#ifndef SIGINT
#error SIGINT not defined
#endif
#ifndef SIGSEGV
#error SIGSEGV not defined
#endif
#ifndef SIGTERM
#error SIGTERM not defined
#endif
int main()
{
sig_atomic_t sig;
typedef void (*func)(int);
static_assert((std::is_same<decltype(signal(0, (func)0)), func>::value), "");
static_assert((std::is_same<decltype(raise(0)), int>::value), "");
}