[syserror] Refactor linuxerr and error package.

Move Error struct to pkg/errors package for use in multiple places.
Move linuxerr static definitions under pkg/errors/linuxerr.
Add a lookup list for quick lookup of *errors.Error by errno. This is useful
when converting syserror errors and unix.Errno/syscall.Errrno values to
*errors.Error.
Update benchmarks routines to include conversions.

The below benchmarks show *errors.Error usage to be comparable to using
unix.Errno.

BenchmarkAssignUnix
BenchmarkAssignUnix-32                 	787875022	         1.284 ns/op
BenchmarkAssignLinuxerr
BenchmarkAssignLinuxerr-32             	1000000000	         1.209 ns/op
BenchmarkAssignSyserror
BenchmarkAssignSyserror-32             	759269229	         1.429 ns/op
BenchmarkCompareUnix
BenchmarkCompareUnix-32                	1000000000	         1.310 ns/op
BenchmarkCompareLinuxerr
BenchmarkCompareLinuxerr-32            	1000000000	         1.241 ns/op
BenchmarkCompareSyserror
BenchmarkCompareSyserror-32            	147196165	         8.248 ns/op
BenchmarkSwitchUnix
BenchmarkSwitchUnix-32                 	373233556	         3.664 ns/op
BenchmarkSwitchLinuxerr
BenchmarkSwitchLinuxerr-32             	476323929	         3.294 ns/op
BenchmarkSwitchSyserror
BenchmarkSwitchSyserror-32             	39293408	        29.62 ns/op
BenchmarkReturnUnix
BenchmarkReturnUnix-32                 	1000000000	         0.5042 ns/op
BenchmarkReturnLinuxerr
BenchmarkReturnLinuxerr-32             	1000000000	         0.8152 ns/op
BenchmarkConvertUnixLinuxerr
BenchmarkConvertUnixLinuxerr-32        	739948875	         1.547 ns/op
BenchmarkConvertUnixLinuxerrZero
BenchmarkConvertUnixLinuxerrZero-32    	977733974	         1.489 ns/op

PiperOrigin-RevId: 379806801

1 files changed, 0 insertions, 164 deletions

diff --git a/pkg/linuxerr/linuxerr_test.go b/pkg/linuxerr/linuxerr_test.go
deleted file mode 100644
index d34937e93..000000000
--- a/pkg/linuxerr/linuxerr_test.go
+++ /dev/null
@@ -1,164 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package syserror_test
-
-import (
-	"errors"
-	"testing"
-
-	"golang.org/x/sys/unix"
-	"gvisor.dev/gvisor/pkg/linuxerr"
-	"gvisor.dev/gvisor/pkg/syserror"
-)
-
-var globalError error
-
-func BenchmarkAssignErrno(b *testing.B) {
-	for i := b.N; i > 0; i-- {
-		globalError = unix.EINVAL
-	}
-}
-
-func BenchmarkLinuxerrAssignError(b *testing.B) {
-	for i := b.N; i > 0; i-- {
-		globalError = linuxerr.EINVAL
-	}
-}
-
-func BenchmarkAssignSyserrorError(b *testing.B) {
-	for i := b.N; i > 0; i-- {
-		globalError = syserror.EINVAL
-	}
-}
-
-func BenchmarkCompareErrno(b *testing.B) {
-	globalError = unix.EAGAIN
-	j := 0
-	for i := b.N; i > 0; i-- {
-		if globalError == unix.EINVAL {
-			j++
-		}
-	}
-}
-
-func BenchmarkCompareLinuxerrError(b *testing.B) {
-	globalError = linuxerr.E2BIG
-	j := 0
-	for i := b.N; i > 0; i-- {
-		if globalError == linuxerr.EINVAL {
-			j++
-		}
-	}
-}
-
-func BenchmarkCompareSyserrorError(b *testing.B) {
-	globalError = syserror.EAGAIN
-	j := 0
-	for i := b.N; i > 0; i-- {
-		if globalError == syserror.EINVAL {
-			j++
-		}
-	}
-}
-
-func BenchmarkSwitchErrno(b *testing.B) {
-	globalError = unix.EPERM
-	j := 0
-	for i := b.N; i > 0; i-- {
-		switch globalError {
-		case unix.EINVAL:
-			j++
-		case unix.EINTR:
-			j += 2
-		case unix.EAGAIN:
-			j += 3
-		}
-	}
-}
-
-func BenchmarkSwitchLinuxerrError(b *testing.B) {
-	globalError = linuxerr.EPERM
-	j := 0
-	for i := b.N; i > 0; i-- {
-		switch globalError {
-		case linuxerr.EINVAL:
-			j++
-		case linuxerr.EINTR:
-			j += 2
-		case linuxerr.EAGAIN:
-			j += 3
-		}
-	}
-}
-
-func BenchmarkSwitchSyserrorError(b *testing.B) {
-	globalError = syserror.EPERM
-	j := 0
-	for i := b.N; i > 0; i-- {
-		switch globalError {
-		case syserror.EINVAL:
-			j++
-		case syserror.EINTR:
-			j += 2
-		case syserror.EAGAIN:
-			j += 3
-		}
-	}
-}
-
-type translationTestTable struct {
-	fn                  string
-	errIn               error
-	syscallErrorIn      unix.Errno
-	expectedBool        bool
-	expectedTranslation unix.Errno
-}
-
-func TestErrorTranslation(t *testing.T) {
-	myError := errors.New("My test error")
-	myError2 := errors.New("Another test error")
-	testTable := []translationTestTable{
-		{"TranslateError", myError, 0, false, 0},
-		{"TranslateError", myError2, 0, false, 0},
-		{"AddErrorTranslation", myError, unix.EAGAIN, true, 0},
-		{"AddErrorTranslation", myError, unix.EAGAIN, false, 0},
-		{"AddErrorTranslation", myError, unix.EPERM, false, 0},
-		{"TranslateError", myError, 0, true, unix.EAGAIN},
-		{"TranslateError", myError2, 0, false, 0},
-		{"AddErrorTranslation", myError2, unix.EPERM, true, 0},
-		{"AddErrorTranslation", myError2, unix.EPERM, false, 0},
-		{"AddErrorTranslation", myError2, unix.EAGAIN, false, 0},
-		{"TranslateError", myError, 0, true, unix.EAGAIN},
-		{"TranslateError", myError2, 0, true, unix.EPERM},
-	}
-	for _, tt := range testTable {
-		switch tt.fn {
-		case "TranslateError":
-			err, ok := syserror.TranslateError(tt.errIn)
-			if ok != tt.expectedBool {
-				t.Fatalf("%v(%v) => %v expected %v", tt.fn, tt.errIn, ok, tt.expectedBool)
-			} else if err != tt.expectedTranslation {
-				t.Fatalf("%v(%v) (error) => %v expected %v", tt.fn, tt.errIn, err, tt.expectedTranslation)
-			}
-		case "AddErrorTranslation":
-			ok := syserror.AddErrorTranslation(tt.errIn, tt.syscallErrorIn)
-			if ok != tt.expectedBool {
-				t.Fatalf("%v(%v) => %v expected %v", tt.fn, tt.errIn, ok, tt.expectedBool)
-			}
-		default:
-			t.Fatalf("Unknown function %v", tt.fn)
-		}
-	}
-}