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[107.215.223.229]) by smtp.gmail.com with ESMTPSA id b13-20020a92ce0d000000b00369fd0b4595sm629913ilo.59.2024.04.05.14.43.31 for <9fans@9fans.net> (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 05 Apr 2024 14:43:32 -0700 (PDT) Content-Type: multipart/alternative; boundary="Apple-Mail=_4ACDA8A4-7B1C-4BDB-8039-E3E1E64D5567" Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3774.500.171.1.1\)) Subject: Re: [9fans] openat() Date: Fri, 5 Apr 2024 14:43:20 -0700 References: To: 9fans <9fans@9fans.net> In-Reply-To: Message-Id: <79953545-3E92-4A48-AA6E-D20B9AD96463@iitbombay.org> X-Mailer: Apple Mail (2.3774.500.171.1.1) Topicbox-Policy-Reasoning: allow: sender is a member Topicbox-Message-UUID: 90a47b4e-f395-11ee-85a5-e4eaa91900c9 Archived-At: =?UTF-8?B?PGh0dHBzOi8vOWZhbnMudG9waWNib3guY29tL2dyb3Vwcy85?= =?UTF-8?B?ZmFucy9UNjc1ZTczN2U3NzZlNWE5Yy1NMGVmYzM4MDI4OTMwMzQxZTBkYjhm?= =?UTF-8?B?Nzk0Pg==?= List-Help: List-Id: "9fans" <9fans.9fans.net> List-Post: List-Software: Topicbox v0 List-Subscribe: Precedence: list Reply-To: 9fans <9fans@9fans.net> Content-Transfer-Encoding: 7bit From: "Bakul Shah via 9fans" <9fans@9fans.net> List-Unsubscribe: , Topicbox-Delivery-ID: 2:9fans:437d30aa-c441-11e9-8a57-d036212d11b0:522be890-2105-11eb-b15e-8d699134e1fa:M0efc38028930341e0db8f794:1:x3R2qgqtKEXtMN-S8CTPDASa16HoaYTADEpmE46tEGs --Apple-Mail=_4ACDA8A4-7B1C-4BDB-8039-E3E1E64D5567 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 To me this sounds very similar to open() given a path relative to your curr= ent working directory. > On Apr 5, 2024, at 2:22=E2=80=AFPM, ron minnich wrot= e: >=20 > not so much what I want, I'm curious about ideas people have about implem= enting it that I would not think of. >=20 > On Fri, Apr 5, 2024 at 1:38=E2=80=AFPM Gorka Guardiola > wrote: >> Hmm sorry. Now I see what you want. Not to rewalk. You can use the chan = of the dirfd and walk just the remainder cloning it and creating a new one.= That way the openat provides the guarantees you want. >>=20 >> On Fri, Apr 5, 2024, 22:15 Gorka Guardiola > wrote: >>> I mean, if you want a new syscall jus copy or call the implementation o= f these. >>>=20 >>>=20 >>> On Fri, Apr 5, 2024, 22:12 Gorka Guardiola > wrote: >>>> =C2=BFIsn't that fd2path, strcat and open? >>>> Or am I misunderstanding something? >>>>=20 >>>> On Fri, Apr 5, 2024, 21:51 ron minnich > wrote: >>>>> One of the folks I worked with, when we pulled a big chunk of plan 9 = into akaros, commented that he had implemented openat on akaros.=20 >>>>>=20 >>>>> I don't want this to turn into a debate on the merits of openat; I am= more curious: if you went to implement openat on Plan 9, how would you go = about it? I have a few ideas but I'm more interested in your ideas. >>>>>=20 >>>>> Thanks >=20 > 9fans / 9fans / see discussions + participants + delivery=C2=A0options Permalink ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/T675e737e776e5a9c-M0efc3= 8028930341e0db8f794 Delivery options: https://9fans.topicbox.com/groups/9fans/subscription --Apple-Mail=_4ACDA8A4-7B1C-4BDB-8039-E3E1E64D5567 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=UTF-8
To me this sou= nds very similar to open() given a path relative to your current working di= rectory.

On Apr 5, 2024, at 2:22 PM, ron minnich <rminni= ch@gmail.com> wrote:

not so much what I want, I'm curious about ideas peop= le have about implementing it that I would not think of.

On Fri, Apr 5, 20= 24 at 1:38 PM Gorka Guardiola <paurea@gmail.com> wrote:
Hmm sorry. Now I see what you wa= nt. Not to rewalk. You can use the chan of the dirfd and walk just the rema= inder cloning it and creating a new one. That way the openat provides the g= uarantees you want.

On Fri, Apr 5, 2024, 22:15 Gorka Guardiola <paurea@gmail.com> wro= te:
I mean, if you want a new syscall jus copy or call the implementa= tion of these.


On Fri, Apr 5, 2024, 22:12 Go= rka Guardiola <paurea@gmail.com> wrote:
¿Isn't that = fd2path, strcat and open?
Or am I misunderstanding somethi= ng?

On Fri, Apr 5, 2024, 21:51 ron minnich <rminnich@g= mail.com> wrote:
One of the folks I worked with, when we pu= lled a big chunk of plan 9 into akaros, commented that he had implemented o= penat on akaros. 

I don't want this to turn i= nto a debate on the merits of openat; I am more curious: if you went to imp= lement openat on Plan 9, how would you go about it? I have a few ideas but = I'm more interested in your ideas.

Thanks

= --Apple-Mail=_4ACDA8A4-7B1C-4BDB-8039-E3E1E64D5567--