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fs: add two new modes "as" and "as+" #18801

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fs: add two new modes "as" and "as+" #18801

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bc65182
fs: support as and as+ flags in stringToFlags()
SirR4T Feb 15, 2018
16537b9
fs: tests and docs for additional modes as and as+
SirR4T Feb 15, 2018
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12 changes: 12 additions & 0 deletions doc/api/fs.md
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Original file line number Diff line number Diff line change
Expand Up @@ -2019,11 +2019,17 @@ The file is created if it does not exist.

* `'ax'` - Like `'a'` but fails if `path` exists.

* `'as'` - Open file for appending in synchronous mode.
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Regarding the phrasing here … I’m not sure, but I think this might lead people to believe that stream.write('foo'); writes the data synchronously, when in reality it still passes it off to the libuv threadpool.

How about something like Open a file for appending with the `O_SYNC` flag set, see open(2) for more details.?

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I think the meaning of synchronous mode is addressed in the 'rs+' mode above. Would it suffice If i can reference to that? How do i do that in markdown?

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@SirR4T You can add an anchor around rs+ with <a id="rs-flag"></a> and reference that as [`rs+`](#rs-flag)

The file is created if it does not exist.

* `'a+'` - Open file for reading and appending.
The file is created if it does not exist.

* `'ax+'` - Like `'a+'` but fails if `path` exists.

* `'as+'` - Open file for reading and appending in synchronous mode.
The file is created if it does not exist.

`mode` sets the file mode (permission and sticky bits), but only if the file was
created. It defaults to `0o666` (readable and writable).

Expand Down Expand Up @@ -3907,11 +3913,17 @@ The file is created if it does not exist.

* `'ax'` - Like `'a'` but fails if `path` exists.

* `'as'` - Open file for appending in synchronous mode.
The file is created if it does not exist.

* `'a+'` - Open file for reading and appending.
The file is created if it does not exist.

* `'ax+'` - Like `'a+'` but fails if `path` exists.

* `'as+'` - Open file for reading and appending in synchronous mode.
The file is created if it does not exist.

`mode` sets the file mode (permission and sticky bits), but only if the file was
created. It defaults to `0o666` (readable and writable).

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4 changes: 4 additions & 0 deletions lib/internal/fs.js
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Expand Up @@ -223,10 +223,14 @@ function stringToFlags(flags) {
case 'a' : return O_APPEND | O_CREAT | O_WRONLY;
case 'ax' : // Fall through.
case 'xa' : return O_APPEND | O_CREAT | O_WRONLY | O_EXCL;
case 'as' : // Fall through.
case 'sa' : return O_APPEND | O_CREAT | O_WRONLY | O_SYNC;

case 'a+' : return O_APPEND | O_CREAT | O_RDWR;
case 'ax+': // Fall through.
case 'xa+': return O_APPEND | O_CREAT | O_RDWR | O_EXCL;
case 'as+': // Fall through.
case 'sa+': return O_APPEND | O_CREAT | O_RDWR | O_SYNC;
}

throw new errors.TypeError('ERR_INVALID_OPT_VALUE', 'flags', flags);
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4 changes: 4 additions & 0 deletions test/parallel/test-fs-open-flags.js
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Expand Up @@ -56,8 +56,12 @@ assert.strictEqual(stringToFlags('wx+'), O_TRUNC | O_CREAT | O_RDWR | O_EXCL);
assert.strictEqual(stringToFlags('xw+'), O_TRUNC | O_CREAT | O_RDWR | O_EXCL);
assert.strictEqual(stringToFlags('ax'), O_APPEND | O_CREAT | O_WRONLY | O_EXCL);
assert.strictEqual(stringToFlags('xa'), O_APPEND | O_CREAT | O_WRONLY | O_EXCL);
assert.strictEqual(stringToFlags('as'), O_APPEND | O_CREAT | O_WRONLY | O_SYNC);
assert.strictEqual(stringToFlags('sa'), O_APPEND | O_CREAT | O_WRONLY | O_SYNC);
assert.strictEqual(stringToFlags('ax+'), O_APPEND | O_CREAT | O_RDWR | O_EXCL);
assert.strictEqual(stringToFlags('xa+'), O_APPEND | O_CREAT | O_RDWR | O_EXCL);
assert.strictEqual(stringToFlags('as+'), O_APPEND | O_CREAT | O_RDWR | O_SYNC);
assert.strictEqual(stringToFlags('sa+'), O_APPEND | O_CREAT | O_RDWR | O_SYNC);

('+ +a +r +w rw wa war raw r++ a++ w++ x +x x+ rx rx+ wxx wax xwx xxx')
.split(' ')
Expand Down