Skip to content

std: Handle ENOSYS when calling pipe2 - #42521

Merged
bors merged 1 commit into
rust-lang:masterfrom
alexcrichton:enosys
Jun 9, 2017
Merged

std: Handle ENOSYS when calling pipe2#42521
bors merged 1 commit into
rust-lang:masterfrom
alexcrichton:enosys

Conversation

@alexcrichton

@alexcrichtonalexcrichton commented Jun 8, 2017

Copy link
Copy Markdown
Member

Should help fix an accidental regression from #39386.

@rust-highfive

rust-highfive commented Jun 8, 2017

Copy link
Copy Markdown
Contributor

r? @brson

(rust_highfive has picked a reviewer for you, use r? to override)

@alexcrichtonalexcrichton mentioned this pull request Jun 8, 2017
Merged
@alexcrichtonalexcrichton added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jun 8, 2017
@alexcrichton

alexcrichton commented Jun 8, 2017

Copy link
Copy Markdown
MemberAuthor

Nominating for a beta backport as this is technically a regression from 1.17.0

aidanhs
aidanhs reviewed Jun 8, 2017
View reviewed changes
Comment threadsrc/libstd/sys/unix/pipe.rs Outdated

@aidanhsaidanhsJun 8, 2017

Copy link
Copy Markdown
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Can we not just copy the info here? I.e. "...may still get ENOSYS if the kernel is too old for pipe2 as glibc unconditionally defines the pipe2 symbol as a thin syscall wrapper."

@alexcrichtonalexcrichtonJun 8, 2017

Copy link
Copy Markdown
MemberAuthor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Sure yeah!

@aidanhsaidanhs added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Jun 8, 2017
cuviper
cuviper approved these changes Jun 8, 2017
View reviewed changes

@cuvipercuviper left a comment

Copy link
Copy Markdown
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Looks good to me, thanks!

@tbu-

tbu- commented Jun 8, 2017

Copy link
Copy Markdown
Contributor

This undoes what #39386 tried to do: You can save the ENOSYS failure of pipe2 in a global atomic boolean (with relaxed semantics) so you won't try pipe2 over and over again if it doesn't exist.

@cuviper

cuviper commented Jun 8, 2017

Copy link
Copy Markdown
Member

Ah, that was before the advice to ignore ENOSYS. An atomic flag seems fine, and is already used in a few other CLOEXEC fallbacks, but it seems frustrating that these aren't more consistent.

@alexcrichton
std: Handle ENOSYS when calling pipe2
44e6406
Should help fix an accidental regression from rust-lang#39386.
@alexcrichton

alexcrichton commented Jun 8, 2017

Copy link
Copy Markdown
MemberAuthor

@bors: r=cuviper

@bors

bors commented Jun 8, 2017

Copy link
Copy Markdown
Collaborator

📌 Commit 44e6406 has been approved by cuviper

frewsxcv added a commit to frewsxcv/rust that referenced this pull request Jun 8, 2017
@frewsxcv
Rollup merge ofrust-lang#42521- alexcrichton:enosys, r=cuviper
215e2b8
std: Handle ENOSYS when calling `pipe2`
Should help fix an accidental regression from rust-lang#39386.
@frewsxcvfrewsxcv mentioned this pull request Jun 8, 2017
Closed
bors added a commit that referenced this pull request Jun 8, 2017
@bors
Auto merge of#42536- frewsxcv:rollup, r=frewsxcv
661bb22
Rollup of 6 pull requests
- Successful merges: #42307, #42385, #42487, #42491, #42521, #42531
- Failed merges:
@bors

bors commented Jun 9, 2017

Copy link
Copy Markdown
Collaborator

⌛ Testing commit 44e6406 with merge a7ac71b...

bors added a commit that referenced this pull request Jun 9, 2017
@bors
Auto merge of#42521- alexcrichton:enosys, r=cuviper
a7ac71b
std: Handle ENOSYS when calling `pipe2`
Should help fix an accidental regression from #39386.
@bors

bors commented Jun 9, 2017

Copy link
Copy Markdown
Collaborator

☀️ Test successful - status-appveyor, status-travis
Approved by: cuviper
Pushing a7ac71b to master...

@bors
bors merged commit 44e6406 into rust-lang:masterJun 9, 2017
@brsonbrson added the beta-accepted Accepted for backporting to the compiler in the beta channel. label Jun 12, 2017
@brsonbrson mentioned this pull request Jun 12, 2017
Merged
@brsonbrson removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Jun 13, 2017
@alexcrichton
alexcrichton deleted the enosys branch June 14, 2017 18:40
bors added a commit that referenced this pull request Jun 15, 2017
@bors
Auto merge of#42609- brson:beta-next, r=alexcrichton
a175ee5
Beta next
- #42521
- #42512
- #42482
- #42481
- #42480
r? @nikomatsakis remember to untag 'beta-nominated' on linked issues
cuviper added a commit to cuviper/jobserver-rs that referenced this pull request Jan 9, 2018
@cuviper
Handle ENOSYS when calling pipe2
01f8642
Just because libc has the symbol, doesn't mean the kernel supports it.
Based on rust-lang/rust#42521.
@cuvipercuviper mentioned this pull request Jan 9, 2018
Merged
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment

Reviewers

@cuvipercuvipercuviper approved these changes
+1 more reviewer
@aidanhsaidanhsaidanhs left review comments
Reviewers whose approvals may not affect merge requirements

Assignees

@brsonbrson

Labels

beta-acceptedAccepted for backporting to the compiler in the beta channel.S-waiting-on-reviewStatus: Awaiting review from the assignee but also interested parties.

Projects

None yet

Milestone

No milestone

Development

Successfully merging this pull request may close these issues.

7 participants

@alexcrichton@rust-highfive@tbu-@cuviper@bors@aidanhs@brson