我应该设置错误号？ [英] Should I set errno?

问题描述

我正在写出口类似的接口发送模块和的recv 。

I'm writing a module which exports an interface similar to send and recv.

由于这些功能都应该分别返回发送和接收的字节数，我不能做正确的错误管理，我会（即使用和enumeratives返回助记符值）做正常。

Since those functions are supposed to return respectively the number of sent and received bytes, I cannot do proper error management as I would do normally (i.e. using enumeratives and returning mnemonic values).

在这样的我应该设置一个情况错误号作为标准库呢？如果是这样，因为错误号是线程特定的，是有它的书写一种特殊的方式，或可我只是一个值分配给它？

In a situation like this should I set errno as the standard library does? If so, since errno is thread specific, is there a particular way of writing on it, or can I simply assign a value to it?

编辑：尝试它，我注意到，设置错误号由分配工作。还是：这是安全和便携的任何系统

experimenting it I noticed that setting errno by assignment is working. Still: is this safe and portable for any system?

推荐答案

这是有点老了，但错误号 - 手动节3 说，你可以直接分配给它，即使它是一个宏观的，这将是线程本地

This is a bit old, but errno - manual section 3 says that you can directly assign to it, even though it is a macro, and it will be thread local

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