db2vend(隔离的供应商进程)：代表一个EDU执行供应商代码，使实例执行用户退出程序，以便进行日志归档(仅在UNIX上)。

Db2vend (fenced vendor process) : Executes vendor code on behalf of an EDU, for instance to execute the user-exit program for log archiving (UNIX-only).

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例如，在清单3中，当执行square - root(- 22.0)时应该产生错误消息，程序退出，返回状态应该是- 1而不是- 1.0。

For example, in Listing 3, it would be good to receive an error message when doing square-root (-22.0) and exiting the program with return status -1 instead of returning -1.0.

youdao

最常见的值应该是SPE_EXIT(程序成功执行，在这个结构中已经保存了一个退出状态)。

The most common value should be SPE_EXIT (the program was successful and an exit status has been stored in the structure).

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