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x/sys/unix: expose signal and errno names as strings #25134

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AlekSi opened this issue Apr 27, 2018 · 7 comments
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x/sys/unix: expose signal and errno names as strings #25134

AlekSi opened this issue Apr 27, 2018 · 7 comments
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FeatureRequest FrozenDueToAge
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@AlekSi
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AlekSi commented Apr 27, 2018

Currently, signal and errno names are represented by the following generated Go code (abbreviated):

const (
  SIGINT = syscall.Signal(0x2)
)

const (
  EAGAIN = syscall.Errno(0xb)
)

var signals = [...]string{
  2: "interrupt",
}

var errors = [...]string{
  11: "resource temporarily unavailable",
}

There is no way to get back signal or errno name (SIGINT and EAGAIN) from the number for, for example, nice logging messages.

I propose to expose them via two functions:

func SignalName(s syscall.Signal) string { }
func ErrnoName(e syscall.Errno) string { }

That's something that annoyed me for years, but I finally decided to create an issue.
@gopherbot gopherbot added this to the Unreleased milestone Apr 27, 2018
@gopherbot
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Change https://golang.org/cl/110156 mentions this issue: zerros: Expose functions to get back names from the number

@tklauser
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Sounds fine to me. It would be nice if we had unix.Errno and unix.Signal types (not sure why these were not converted in the initial x/sys package split). We could then even have

func (s Signal) Name() string { ... }
func (e Errno) Name() string {... }

@ianlancetaylor @bradfitz what do you think?

@ianlancetaylor
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I think we would still want SignalName and ErrnoName, for use with the standard library. It seems a little confusing to require people to convert to unix.Signal or unix.Errno.

@gopherbot
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Change https://golang.org/cl/110875 mentions this issue: unix: add ErrnoName and SignalName

@kolyshkin kolyshkin mentioned this issue Oct 4, 2018
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@kolyshkin
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@tklauser it seems that zerrors_linux_sparc64.go is not converted to the new format.

@gopherbot
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Change https://golang.org/cl/139977 mentions this issue: unix: convert errorList and signalList to new format for linux/sparc64

@tklauser
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tklauser commented Oct 5, 2018

@kolyshkin uh, I forgot to change it there because linux/sparc64is not integrated with the Docker-based build system. I sent https://golang.org/cl/139977 to fix it. Thanks.

gopherbot pushed a commit to golang/sys that referenced this issue Oct 5, 2018
@tklauser
unix: convert errorList and signalList to new format for linux/sparc64
4497e2d 
This wasn't converted during CL 110875

Updates golang/go#25134

Change-Id: Iaa579e0c173d3e27cf9f7e20072752277089beb1
Reviewed-on: https://go-review.googlesource.com/c/139977
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
@golang golang locked and limited conversation to collaborators Oct 5, 2019
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@AlekSi @tklauser @agnivade @ianlancetaylor @kolyshkin @gopherbot