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int main(int argc, char **argv){
    uint ret, pid;
    if (fork()==0) {
        exec("/bin/sh", NULL);
    }
    printn(1, 10); //seg fault
    while(1) {
        pid = wait(&ret);
        //printf("exited - pid %d => %d\n", pid, ret);
    }
}

#define _SYS1(T0, FN, T1)                       \
    T0 FN(T1 p1){                               \
        register int r;                         \
        asm volatile(                           \
            "int $0x80"                         \
            :"=a"(r),                           \
             "=b"(errno)                        \
            :"a"(NR_##FN),                      \
             "b"((int)p1)                       \
        );                                      \
        if (r<0){                               \
            errno = -r;                         \
            return -1;                          \
        }                                       \
        return r;                               \
    }

 NINT = 128
 0.upto(NINT) do |i|
   puts %{
     _hwint#{i}:
       #{'push  dword 0' if i!=17 and (i<8 or i>14)}
       push  dword #{i}
       jmp   _hwint_common_stub
   }
 end

 # generate the vector table
 puts %{
 ; vector table
 [section .data]
 [global  _hwint]

 _hwint:
 }
 0.upto(NINT) do |i|
   puts "  dd _hwint#{i}"
 end