[syserror] Add linuxerr package.

Add linuxerr package to replace syserror and syserr errors. This is done
to improve performance comparing/returning errors to on par with
syscall.Errno.

The below linuxerr_test (formerly syserror_test) shows linuxerr.Error
on par with unix.Error (syscall.Errno) as desired.

BenchmarkAssignErrno
BenchmarkAssignErrno-6                  1000000000               0.6291 ns/op
BenchmarkLinuxerrAssignError
BenchmarkLinuxerrAssignError-6          1000000000               0.5808 ns/op
BenchmarkAssignSyserrorError
BenchmarkAssignSyserrorError-6          1000000000               0.6188 ns/op
BenchmarkCompareErrno
BenchmarkCompareErrno-6                 1000000000               0.5041 ns/op
BenchmarkCompareLinuxerrError
BenchmarkCompareLinuxerrError-6         1000000000               0.4660 ns/op
BenchmarkCompareSyserrorError
BenchmarkCompareSyserrorError-6         309026907                3.386 ns/op
BenchmarkSwitchErrno
BenchmarkSwitchErrno-6                  722253750                1.440 ns/op
BenchmarkSwitchLinuxerrError
BenchmarkSwitchLinuxerrError-6          709108542                1.453 ns/op
BenchmarkSwitchSyserrorError
BenchmarkSwitchSyserrorError-6          106331331               11.21 ns/op

PiperOrigin-RevId: 374507431

2 files changed, 1 insertions, 142 deletions

diff --git a/pkg/syserror/BUILD b/pkg/syserror/BUILD
index 7d2f5adf6..76bee5a64 100644
--- a/pkg/syserror/BUILD
+++ b/pkg/syserror/BUILD
@@ -1,4 +1,4 @@
-load("//tools:defs.bzl", "go_library", "go_test")
+load("//tools:defs.bzl", "go_library")
 
 package(licenses = ["notice"])
 
@@ -8,12 +8,3 @@ go_library(
     visibility = ["//visibility:public"],
     deps = ["@org_golang_x_sys//unix:go_default_library"],
 )
-
-go_test(
-    name = "syserror_test",
-    srcs = ["syserror_test.go"],
-    deps = [
-        ":syserror",
-        "@org_golang_x_sys//unix:go_default_library",
-    ],
-)
diff --git a/pkg/syserror/syserror_test.go b/pkg/syserror/syserror_test.go
deleted file mode 100644
index c141e5f6e..000000000
--- a/pkg/syserror/syserror_test.go
+++ /dev/null
@@ -1,132 +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/syserror"
-)
-
-var globalError error
-
-func BenchmarkAssignErrno(b *testing.B) {
-	for i := b.N; i > 0; i-- {
-		globalError = unix.EINVAL
-	}
-}
-
-func BenchmarkAssignError(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 BenchmarkCompareError(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 += 1
-		case unix.EINTR:
-			j += 2
-		case unix.EAGAIN:
-			j += 3
-		}
-	}
-}
-
-func BenchmarkSwitchError(b *testing.B) {
-	globalError = syserror.EPERM
-	j := 0
-	for i := b.N; i > 0; i-- {
-		switch globalError {
-		case syserror.EINVAL:
-			j += 1
-		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)
-		}
-	}
-}