PTRACE_PEEKSIGINFO
case PTRACE_PEEKSIGINFO:
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, siginfo);
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_rw);
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg,
ret = sys_ptrace(PTRACE_PEEKSIGINFO, child, &arg, addr_ro);