#include <bits/errno-return.h>
#include <signal.h>
#include <sys/syscall.h>
#include <unistd.h>

extern "C" void sigreturn();

extern "C"
{
    int sigaction(int signo, const struct sigaction* act, struct sigaction* oldact)
    {
        long rc = syscall(SYS_sigaction, signo, act, oldact, sigreturn);
        __errno_return(rc, int);
    }

    int kill(pid_t pid, int signo)
    {
        long rc = syscall(SYS_kill, pid, signo);
        __errno_return(rc, int);
    }

    int raise(int signo)
    {
        return kill(getpid(), signo);
    }
}