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doc: update behaviour of fs.writeFile #25080

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thefourtheye
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As per the decision in #23433,
the fs.writeFile will always write from the current position if it
is used with file descriptors. This patch updates it.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • documentation is changed or added
  • commit message follows commit guidelines

cc @nodejs/fs @nodejs/tsc

@thefourtheye thefourtheye added doc Issues and PRs related to the documentations. fs Issues and PRs related to the fs subsystem / file system. semver-major PRs that contain breaking changes and should be released in the next major version. labels Dec 17, 2018
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@mcollina mcollina left a comment

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LGTM

@vsemozhetbyt vsemozhetbyt added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Dec 17, 2018
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Node.js Collaborators, please, add 👍 here if you approve fast-tracking.

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pls make sure there's a Ref: https://github.com/nodejs/node/pull/23709 in the metadata too.

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I don't think it should be fast-tracked. Its a critical, much debated, long discussed change, and documentation text should at least have the opportunity for people to comment on it.

doc/api/fs.md Outdated
then the contents of the file would be `'Aloha World'`, rather than just
`'Aloha'`.
3. The writing will begin at the current position. For example, if the string
`'Hello'` is written to the file descriptor, and if `'World'` is written with
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I would suggest a string of ', World'. Or perhaps, the first string could be 'Dogs\n', and the second 'Cats\n'? The docs as written generate a misspelled phrase, which to me suggests its demonstrating a side-effect of some kind of misuse of the API, rather than a working-as-designed-and-useful capability.

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I included your suggestion, the , World. I didn't change it to Dogs and Cats because, readFile also uses Hello World as the example. Perhaps we can change them together in a separate PR. What do you think?

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Related code change #23709

@thefourtheye thefourtheye force-pushed the update-fs-writefile-doc branch 2 times, most recently from 3177ae2 to bb31222 Compare December 26, 2018 07:38
As per the decision in nodejs#23433,
the `fs.writeFile` will always write from the current position if it
is used with file descriptors. This patch updates it.

Ref: nodejs#23709
@thefourtheye thefourtheye force-pushed the update-fs-writefile-doc branch from bb31222 to 55822cf Compare December 26, 2018 07:40
@addaleax
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addaleax commented Jan 7, 2019

Landed in 309e772

@addaleax addaleax closed this Jan 7, 2019
addaleax pushed a commit that referenced this pull request Jan 7, 2019
As per the decision in #23433,
the `fs.writeFile` will always write from the current position if it
is used with file descriptors. This patch updates it.

Ref: #23709

PR-URL: #25080
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@thefourtheye thefourtheye deleted the update-fs-writefile-doc branch January 8, 2019 03:52
refack pushed a commit to refack/node that referenced this pull request Jan 14, 2019
As per the decision in nodejs#23433,
the `fs.writeFile` will always write from the current position if it
is used with file descriptors. This patch updates it.

Ref: nodejs#23709

PR-URL: nodejs#25080
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
@BethGriggs BethGriggs mentioned this pull request Apr 18, 2019
BethGriggs added a commit that referenced this pull request Apr 22, 2019
Notable changes:

* assert:
  * improve performance to instantiate errors (Ruben Bridgewater)
    [#26738](#26738)
  * validate required arguments (Ruben Bridgewater)
    [#26641](#26641)
  * adjust loose assertions (Ruben Bridgewater)
    [#25008](#25008)
* async_hooks:
  * remove deprecated emitBefore and emitAfter (Matteo Collina)
    [#26530](#26530)
  * remove promise object from resource (Andreas Madsen)
    [#23443](#23443)
* bootstrap
  * make Buffer and process non-enumerable (Ruben Bridgewater)
    [#24874](#24874)
* buffer:
  * use stricter range checks (Ruben Bridgewater)
    [#27045](#27045)
  * harden SlowBuffer creation (ZYSzys)
    [#26272](#26272)
  * harden validation of buffer allocation size (ZYSzys)
    [#26162](#26162)
  * do proper error propagation in addon methods (Anna Henningsen)
    [#23939](#23939)
* child_process:
  * change the defaults maxBuffer size (kohta ito)
    [#27179](#27179)
  * harden fork arguments validation (ZYSzys)
    [#27039](#27039)
  * use non-infinite maxBuffer defaults (kohta ito)
    [#23027](#23027)
* console:
  * don't use ANSI escape codes when TERM=dumb (Vladislav Kaminsky)
    [#26261](#26261)
* crypto:
  * remove legacy native handles (Tobias Nießen)
    [#27011](#27011)
  * decode missing passphrase errors (Tobias Nießen)
    [#25208](#25208)
  * move DEP0113 to End-of-Life (Tobias Nießen)
    [#26249](#26249)
  * remove deprecated crypto.\_toBuf (Tobias Nießen)
    [#25338](#25338)
  * set `DEFAULT\_ENCODING` property to non-enumerable
    (Antoine du Hamel)
    [#23222](#23222)
* deps:
  * silence irrelevant V8 warning (Michaël Zasso)
    [#26685](#26685)
  * update postmortem metadata generation script (cjihrig)
    [#26685](#26685)
  * V8: un-cherry-pick bd019bd (Refael Ackermann)
    [#26685](#26685)
  * V8: cherry-pick 6 commits (Michaël Zasso)
    [#26685](#26685)
  * V8: cherry-pick d82c9af (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick e5f01ba (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick d5f08e4 (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick 6b09d21 (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick f0bb5d2 (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick 5b0510d (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick 91f0cd0 (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick 392316d (Anna Henningsen)
    [#26685](#26685)
  * V8: cherry-pick 2f79d68 (Anna Henningsen)
    [#26685](#26685)
  * sync V8 gypfiles with 7.4 (Ujjwal Sharma)
    [#26685](#26685)
  * update V8 to 7.4.288.13 (Ujjwal Sharma)
    [#26685](#26685)
  * bump minimum icu version to 63 (Ujjwal Sharma)
    [#25852](#25852)
  * silence irrelevant V8 warnings (Michaël Zasso)
    [#25852](#25852)
  * V8: cherry-pick 7803fa6 (Jon Kunkee)
    [#25852](#25852)
  * V8: cherry-pick 58cefed (Jon Kunkee)
    [#25852](#25852)
  * V8: cherry-pick d3308d0 (Michaël Zasso)
    [#25852](#25852)
  * V8: cherry-pick 74571c8 (Michaël Zasso)
    [#25852](#25852)
  * cherry-pick fc0ddf5 from upstream V8 (Anna Henningsen)
    [#25852](#25852)
  * sync V8 gypfiles with 7.3 (Ujjwal Sharma)
    [#25852](#25852)
  * sync V8 gypfiles with 7.2 (Michaël Zasso)
    [#25852](#25852)
  * update V8 to 7.3.492.25 (Michaël Zasso)
    [#25852](#25852)
  * add s390 asm rules for OpenSSL-1.1.1 (Shigeki Ohtsu)
    [#19794](#19794)
  * sync V8 gypfiles with 7.1 (Refael Ackermann)
    [#23423](#23423)
  * update V8 to 7.1.302.28 (Michaël Zasso)
    [#23423](#23423)
* doc:
  * update behaviour of fs.writeFile
    (Sakthipriyan Vairamani (thefourtheye))
    [#25080](#25080)
  * add internal functionality details of util.inherits
    (Ruben Bridgewater)
    [#24755](#24755)
* errors:
  * update error name (Ruben Bridgewater)
    [#26738](#26738)
* fs:
  * use proper .destroy() implementation for SyncWriteStream
    (Matteo Collina)
    [#26690](#26690)
  * improve mode validation (Ruben Bridgewater)
    [#26575](#26575)
  * harden validation of start option in createWriteStream (ZYSzys)
    [#25579](#25579)
  * make writeFile consistent with readFile wrt fd
    (Sakthipriyan Vairamani (thefourtheye))
    [#23709](#23709)
* http:
  * validate timeout in ClientRequest() (cjihrig)
    [#26214](#26214)
  * return HTTP 431 on HPE\_HEADER\_OVERFLOW error (Albert Still)
    [#25605](#25605)
  * switch default parser to llhttp (Anna Henningsen)
    [#24870](#24870)
  * change DEP0066 to a runtime deprecation (Morgan Roderick)
    [#24167](#24167)
  * else case is not reachable (szabolcsit)
    [#24176](#24176)
* lib:
  * move DEP0021 to end of life (cjihrig)
    [#27127](#27127)
  * remove Atomics.wake (Gus Caplan)
    [#27033](#27033)
  * validate Error.captureStackTrace() calls (Ruben Bridgewater)
    [#26738](#26738)
  * refactor Error.captureStackTrace() usage (Ruben Bridgewater)
    [#26738](#26738)
  * move DTRACE\_\* probes out of global scope (James M Snell)
    [#26541](#26541)
  * deprecate \_stream\_wrap (Sam Roberts)  [#26245]
  (#26245)
  * don't use `util.inspect()` internals (Ruben Bridgewater)
    [#24971](#24971)
  * improve error message for MODULE\_NOT\_FOUND (Ali Ijaz Sheikh)
    [#25690](#25690)
  * requireStack property for MODULE\_NOT\_FOUND (Ali Ijaz Sheikh)
    [#25690](#25690)
  * move DEP0029 to end of life (cjihrig)
    [#25377](#25377)
  * move DEP0028 to end of life (cjihrig)
    [#25377](#25377)
  * move DEP0027 to end of life (cjihrig)
    [#25377](#25377)
  * move DEP0026 to end of life (cjihrig)
    [#25377](#25377)
  * move DEP0023 to end of life (cjihrig)
    [#25280](#25280)
  * move DEP0006 to end of life (cjihrig)
    [#25279](#25279)
  * remove unintended access to deps/ (Anna Henningsen)
    [#25138](#25138)
  * move DEP0120 to end of life (cjihrig)
    [#24862](#24862)
  * use ES6 class inheritance style (Ruben Bridgewater)
    [#24755](#24755)
  * remove `inherits()` usage (Ruben Bridgewater)
    [#24755](#24755)
* module:
  * remove dead code (Ruben Bridgewater)
    [#26983](#26983)
  * mark DEP0019 as End-of-Life (Ruben Bridgewater)
    [#26973](#26973)
  * throw an error for invalid package.json main entries
    (Ruben Bridgewater)
    [#26823](#26823)
  * don't search in require.resolve.paths (cjihrig)
    [#23683](#23683)
* n-api:
  * remove code from error name (Ruben Bridgewater)
    [#26738](#26738)
* net:
  * do not manipulate potential user code (Ruben Bridgewater)
    [#26751](#26751)
  * emit "write after end" errors in the next tick (Ouyang Yadong)
    [#24457](#24457)
  * deprecate \_setSimultaneousAccepts() undocumented function
    (James M Snell)
    [#23760](#23760)
* net,http2:
  * merge setTimeout code (ZYSzys)
    [#25084](#25084)
* os:
  * implement os.type() using uv\_os\_uname() (cjihrig)
    [#25659](#25659)
* process:
  * global.process, global.Buffer getters (Guy Bedford)
    [#26882](#26882)
  * move DEP0062 (node --debug) to end-of-life (Joyee Cheung)
    [#25828](#25828)
  * exit on --debug and --debug-brk after option parsing (Joyee Cheung)
    [#25828](#25828)
  * improve `--redirect-warnings` handling (Ruben Bridgewater)
    [#24965](#24965)
* readline:
  * support TERM=dumb (Vladislav Kaminsky)
    [#26261](#26261)
* repl:
  * add welcome message (gengjiawen)
    [#25947](#25947)
  * fix terminal default setting (Ruben Bridgewater)
    [#26518](#26518)
  * check colors with .getColorDepth() (Vladislav Kaminsky)
    [#26261](#26261)
  * deprecate REPLServer.rli (Ruben Bridgewater)
    [#26260](#26260)
* src:
  * remove unused INT\_MAX constant (Sam Roberts)
    [#27078](#27078)
  * update NODE\_MODULE\_VERSION to 72 (Ujjwal Sharma)
    [#26685](#26685)
  * remove `AddPromiseHook()` (Anna Henningsen)
    [#26574](#26574)
  * update NODE\_MODULE\_VERSION to 71 (Michaël Zasso)
    [#25852](#25852)
  * clean up MultiIsolatePlatform interface (Anna Henningsen)
    [#26384](#26384)
  * properly configure default heap limits (Ali Ijaz Sheikh)
    [#25576](#25576)
  * remove icuDataDir from node config (GauthamBanasandra)
    [#24780](#24780)
  * explicitly allow JS in ReadHostObject (Yang Guo)
    [#23423](#23423)
  * update postmortem constant (cjihrig)
    [#23423](#23423)
  * update NODE\_MODULE\_VERSION to 68 (Michaël Zasso)
    [#23423](#23423)
* tls:
  * support TLSv1.3 (Sam Roberts)
    [#26209](#26209)
  * return correct version from getCipher() (Sam Roberts)
    [#26625](#26625)
  * check arg types of renegotiate() (Sam Roberts)
    [#25876](#25876)
  * add code for ERR\_TLS\_INVALID\_PROTOCOL\_METHOD (Sam Roberts)
    [#24729](#24729)
  * emit a warning when servername is an IP address (Rodger Combs)
    [#23329](#23329)
  * disable TLS v1.0 and v1.1 by default (Ben Noordhuis)
    [#23814](#23814)
  * remove unused arg to createSecureContext() (Sam Roberts)
    [#24241](#24241)
  * deprecate Server.prototype.setOptions() (cjihrig)[
    #23820](#23820)
  * load NODE\_EXTRA\_CA\_CERTS at startup (Ouyang Yadong)
    [#23354](#23354)
* util:
  * change inspect compact and breakLength default (Ruben Bridgewater)
    [#27109](#27109)
  * improve inspect edge cases (Ruben Bridgewater)
    [#27109](#27109)
  * only the first line of the error message (Simon Zünd)
    [#26685](#26685)
  * don't set the prototype of callbackified functions
    (Ruben Bridgewater)
    [#26893](#26893)
  * rename callbackified function (Ruben Bridgewater)
    [#26893](#26893)
  * increase function length when using `callbackify()`
    (Ruben Bridgewater)
    [#26893](#26893)
  * prevent tampering with internals in `inspect()` (Ruben Bridgewater)
    [#26577](#26577)
  * fix proxy inspection (Ruben Bridgewater)
    [#26241](#26241)
  * prevent leaking internal properties (Ruben Bridgewater)
    [#24971](#24971)
  * protect against monkeypatched Object prototype for inspect()
    (Rich Trott)
    [#25953](#25953)
  * treat format arguments equally (Roman Reiss)
    [#23162](#23162)
* win, fs:
  * detect if symlink target is a directory (Bartosz Sosnowski)
    [#23724](#23724)
* zlib:
  * throw TypeError if callback is missing (Anna Henningsen)[
    #24929](#24929)
  * make “bare” constants un-enumerable (Anna Henningsen)
    [#24824](#24824)

PR-URL: #26930
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