PARA_ERROR(SIGNAL_READ, "read error from signal pipe"), \
PARA_ERROR(WAITPID, "waitpid error"), \
PARA_ERROR(SIGNAL_PIPE, "failed to setup signal pipe"), \
PARA_ERROR(SIGNAL_READ, "read error from signal pipe"), \
PARA_ERROR(WAITPID, "waitpid error"), \
PARA_ERROR(SIGNAL_PIPE, "failed to setup signal pipe"), \