Re: errno handling on sys.() and io.() functions
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- Subject: Re: errno handling on sys.() and io.() functions
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2013年1月31日 09:14:32 -0200
> Today I noticed that these functions also return errno as third return value.
> This seems to be mentioned in PIL, but is omitted in the reference manual. Is
> this officialy part of the Lua API, and is it safe to depend on this behaviour?
* http://www.lua.org/manual/5.2/manual.html#6.8
Unless otherwise stated, all I/O functions return nil on failure (plus
an error message as a second result and a system-dependent error code
as a third result) [...]
* http://www.lua.org/manual/5.2/manual.html#pdf-os.remove
os.remove (filename)
[...] If this function fails, it returns nil, plus a string describing
the error and the error code.
...
-- Roberto