PARA_ERROR(SIGNAL_SIG_ERR, "signal() retured SIG_ERR"), \
PARA_ERROR(SIGNAL_READ, "read error from signal pipe"), \
PARA_ERROR(WAITPID, "waitpid error"), \
PARA_ERROR(SIGNAL_SIG_ERR, "signal() retured SIG_ERR"), \
PARA_ERROR(SIGNAL_READ, "read error from signal pipe"), \
PARA_ERROR(WAITPID, "waitpid error"), \