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| author | Joyee Cheung <joyeec9h3@gmail.com> | 2018-01-17 03:21:16 +0800 |
|---|---|---|
| committer | Joyee Cheung <joyeec9h3@gmail.com> | 2018-01-20 08:51:47 +0800 |
| commit | 4af1bba6d0f1da1b4d444ef3a936e2ef2c639a1e (patch) | |
| tree | ae8a75b9ac85984da88ee4af569215b94befd1b5 /doc/api/util.md | |
| parent | cbd634947d3aa308266ac6192a5af0a30445a449 (diff) | |
| download | android-node-v8-4af1bba6d0f1da1b4d444ef3a936e2ef2c639a1e.tar.gz android-node-v8-4af1bba6d0f1da1b4d444ef3a936e2ef2c639a1e.tar.bz2 android-node-v8-4af1bba6d0f1da1b4d444ef3a936e2ef2c639a1e.zip | |
util: implement util.getSystemErrorName()
Reimplement uv.errname() as internal/util.getSystemErrorName() to
avoid the memory leaks caused by unknown error codes
and avoid calling into C++ for the error names. Also
expose it as a public API for external use.
PR-URL: https://github.com/nodejs/node/pull/18186
Refs: http://docs.libuv.org/en/v1.x/errors.html#c.uv_err_name
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Diffstat (limited to 'doc/api/util.md')
| -rw-r--r-- | doc/api/util.md | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/doc/api/util.md b/doc/api/util.md index 68f8487b1b..c9ce952af3 100644 --- a/doc/api/util.md +++ b/doc/api/util.md @@ -257,6 +257,25 @@ intended as a debugging tool. Some input values can have a significant performance overhead that can block the event loop. Use this function with care and never in a hot code path. +## util.getSystemErrorName(err) +<!-- YAML +added: REPLACEME +--> + +* `err` {number} +* Returns: {string} + +Returns the string name for a numeric error code that comes from a Node.js API. +The mapping between error codes and error names is platform-dependent. +See [Common System Errors][] for the names of common errors. + +```js +fs.access('file/that/does/not/exist', (err) => { + const name = util.getSystemErrorName(err.errno); + console.error(name); // ENOENT +}); +``` + ## util.inherits(constructor, superConstructor) <!-- YAML added: v0.3.0 @@ -1362,6 +1381,7 @@ Deprecated predecessor of `console.log`. [Customizing `util.inspect` colors]: #util_customizing_util_inspect_colors [Internationalization]: intl.html [WHATWG Encoding Standard]: https://encoding.spec.whatwg.org/ +[Common System Errors]: errors.html#errors_common_system_errors [constructor]: https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/constructor [list of deprecated APIS]: deprecations.html#deprecations_list_of_deprecated_apis [semantically incompatible]: https://github.com/nodejs/node/issues/4179 |