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doc: specify that errno is a number, not a string

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The documentation erroneously described the errno property as an alias
for the code property, but that is not the case in the implementation.
errno is the error code of the error as a number, and code is the error
code of the error as a string.

PR-URL: https://github.com/nodejs/node/pull/9007
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
This commit is contained in:
John Vilk 2016-10-10 12:28:49 -04:00 committed by Luigi Pinca
parent f7842ad169
commit f478b46a00
1 changed files with 5 additions and 3 deletions
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8
doc/api/errors.md
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@ -449,13 +449,15 @@ added properties.
### Class: System Error
#### error.code
#### error.errno
Returns a string representing the error code, which is always `E` followed by
a sequence of capital letters, and may be referenced in `man 2 intro`.
The properties `error.code` and `error.errno` are aliases of one another and
return the same value.
#### error.errno
Returns a number corresponding to the **negated** error code, which may be
referenced in `man 2 intro`. For example, an `ENOENT` error has an `errno` of
`-2` because the error code for `ENOENT` is `2`.
#### error.syscall