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src: define fs.constants.S_IWUSR & S_IRUSR for Win
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On Windows, most of the POSIX file mode definitions are not available.
However, functionally equivalent read/write definitions exists, and
chmod() can use them. This patch defines two aliases, so that these
definintions are issued in fs.constants.

fixes: #41591

PR-URL: #42757
Refs: #41591
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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ilg-ul authored and targos committed Apr 28, 2022
1 parent 5d15eb1 commit 1976284
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18 changes: 17 additions & 1 deletion doc/api/fs.md
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Expand Up @@ -6771,7 +6771,11 @@ operations.
The following constants are exported by `fs.constants`.
Not every constant will be available on every operating system.
Not every constant will be available on every operating system;
this is especially important for Windows, where many of the POSIX specific
definitions are not available.
For portable applications it is recommended to check for their presence
before use.
To use more than one constant, use the bitwise OR `|` operator.
Expand Down Expand Up @@ -6824,6 +6828,8 @@ The following constants are meant for use as the `mode` parameter passed to
</tr>
</table>
The definitions are also available on Windows.
##### File copy constants
The following constants are meant for use with [`fs.copyFile()`][].
Expand Down Expand Up @@ -6852,6 +6858,8 @@ The following constants are meant for use with [`fs.copyFile()`][].
</tr>
</table>
The definitions are also available on Windows.
##### File open constants
The following constants are meant for use with `fs.open()`.
Expand Down Expand Up @@ -6946,6 +6954,9 @@ The following constants are meant for use with `fs.open()`.
</tr>
</table>
On Windows, only `O_APPEND`, `O_CREAT`, `O_EXCL`, `O_RDONLY`, `O_RDWR`,
`O_TRUNC`, `O_WRONLY` and `UV_FS_O_FILEMAP` are available.
##### File type constants
The following constants are meant for use with the {fs.Stats} object's
Expand Down Expand Up @@ -6990,6 +7001,9 @@ The following constants are meant for use with the {fs.Stats} object's
</tr>
</table>
On Windows, only `S_IFCHR`, `S_IFDIR`, `S_IFLNK`, `S_IFMT`, and `S_IFREG`,
are available.
##### File mode constants
The following constants are meant for use with the {fs.Stats} object's
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</tr>
</table>
On Windows, only `S_IRUSR` and `S_IWUSR` are available.
## Notes
### Ordering of callback and promise-based operations
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10 changes: 10 additions & 0 deletions src/node_constants.cc
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Expand Up @@ -47,6 +47,16 @@
#include <dlfcn.h>
#endif

#if defined(_WIN32)
#include <io.h> // _S_IREAD _S_IWRITE
#ifndef S_IRUSR
#define S_IRUSR _S_IREAD
#endif // S_IRUSR
#ifndef S_IWUSR
#define S_IWUSR _S_IWRITE
#endif // S_IWUSR
#endif

#include <cerrno>
#include <csignal>
#include <limits>
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8 changes: 8 additions & 0 deletions test/parallel/test-fs-constants.js
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@@ -0,0 +1,8 @@
'use strict';
require('../common');
const fs = require('fs');
const assert = require('assert');

// Check if the two constants accepted by chmod() on Windows are defined.
assert.notStrictEqual(fs.constants.S_IRUSR, undefined);
assert.notStrictEqual(fs.constants.S_IWUSR, undefined);

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