Zen

Source string Source string

592/10000 · 592
English Actions
Name
Use
:ref:`errno() <errno-errno>`
Get an error number for the last OS-related function
:ref:`errno.strerror() <errno-strerror>`
Get an error message for the corresponding error number
Return an error number for the last operating-system-related function, or 0. To invoke it, simply say ``errno()``, without the module name.
rtype
integer
Return a string, given an error number. The string will contain the text of the conventional error message for the current operating system. If ``code`` is not supplied, the error message will be for the last operating-system-related function, or 0.
Parameters
number of an operating-system error
string
**Example:**
This function displays the result of a call to :ref:`fio.open() <fio-open>` which causes error 2 (``errno.ENOENT``). The display includes the error number, the associated error string, and the error name.
tarantool> function f()
> local fio = require('fio')
> local errno = require('errno')
> fio.open('no_such_file')
> print('errno() = ' .. errno())
> print('errno.strerror() = ' .. errno.strerror())
> local t = getmetatable(errno).__index
> for k, v in pairs(t) do
> if v == errno() then
> print('errno() constant = ' .. k)
> end
> end
> end
---
...

tarantool> f()
errno() = 2
errno.strerror() = No such file or directory
errno() constant = ENOENT
---
...
To see all possible error names stored in the ``errno`` metatable, say ``getmetatable(errno)`` (output abridged):
tarantool> getmetatable(errno)
---
- __newindex: 'function: 0x41666a38'
__call: 'function: 0x41666890'
__index:
ENOLINK: 67
EMSGSIZE: 90
EOVERFLOW: 75
ENOTCONN: 107
EFAULT: 14
EOPNOTSUPP: 95
EEXIST: 17
ENOSR: 63
ENOTSOCK: 88
EDESTADDRREQ: 89
<...>
...

Loading…

User avatar None

New source string

testing_project / Documentation: reference/reference_lua/errno — English

tarantool> function f()
> local fio = require('fio')
> local errno = require('errno')
> fio.open('no_such_file')
> print('errno() = ' .. errno())
> print('errno.strerror() = ' .. errno.strerror())
> local t = getmetatable(errno).__index
> for k, v in pairs(t) do
> if v == errno() then
> print('errno() constant = ' .. k)
> end
> end
> end
---
...

tarantool> f()
errno() = 2
errno.strerror() = No such file or directory
errno() constant = ENOENT
---
...
2 years ago
Browse all string changes

Things to check

Ellipsis

The string uses three dots (...) instead of an ellipsis character (…)

Reset

Glossary

English English
No related strings found in the glossary.

String information

Flags
read-only
String age
2 years ago
Last updated
2 years ago
Source string age
2 years ago
Translation file
string 21