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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
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