punix

Documentation

Overview

punix has functions to examine unix.Errno errors

Index

• func Errno(err error) (errnoValue unix.Errno)
• func ErrnoError(err error, includeError ...bool) (errnoString string)
• func ErrnoString(label string, err error) (errnoNumericString string)
• func IsConnectionRefused(err error) (isConnectionRefused bool)
• func IsENOENT(err error) (isENOENT bool)
• func OsVersion() (version string, hasVersion bool, err error)
• func Processor() (model string, err error)

Functions

func Errno

func Errno(err error) (errnoValue unix.Errno)

Errno scans an error chain for a unix.Errno type.

• if no errno value exists, unix.Errno 0x0 is returned
• unlike most error implementations, unix.Errno type is uintptr
• to check for error condition of a unix.Errno error: if errno != 0 {…
• to obtain errno number: int(errno)
• to print errno number: fmt.Sprintf("%d", errno) → "1"
• to print errno message: fmt.Sprintf("%v", unix.EPERM) → "operation not permitted"
• to obtain errno name: unix.ErrnoName(unix.EPERM) → "EPERM"
• to print hexadecimal errno:

Note: unix.Errno.Error has value receiver. Errno checks:

Errno(nil) == 0 → true.
if errno != 0 {…
int(errno) // numeric value
 if errno == unix.ENOENT…
 fmt.Sprintf("%d", unix.EPERM) → "1"
 fmt.Printf("%v", errno) → "state not recoverable"
 unix.ErrnoName(unix.EPERM) → "EPERM"
 var i, s = int(errno), ""
 if i < 0 { i = -i; s = "-" }
 fmt.Printf("%s0x%x", s, i) → 0x68

func ErrnoError

func ErrnoError(err error, includeError ...bool) (errnoString string)

ErrnoError gets the errno interpretation if the error chain does contain a unix.Errno type. if includeError is true, the error chain’s error message is prepended. if includeError is true and err is nil "OK" is returned if includeError is false or missing and no errno exists, the empty string is returned

func ErrnoString

func ErrnoString(label string, err error) (errnoNumericString string)

ErrnoString returns the errno number as a string if the err error chain has a non-zero syscall.Errno error.

• if label is empty string, no label is returned
• if no syscall.Errno is found or it is zero, the empty string is returned
• ErrnoString("errno", nil) → ""
• ErrnoString("errno", unix.EPERM) → "errno: EPERM 1 0x1"
• ErrnoString("errno", unix.Errno(math.MaxUint)) → "-1 -0x1"

func IsConnectionRefused

func IsConnectionRefused(err error) (isConnectionRefused bool)

IsConnectionRefused searches the error chsin of err for unix.ECONNREFUSED net.Dialer errors for closed socket

func IsENOENT

func IsENOENT(err error) (isENOENT bool)

IsENOENT returns true if the root cause of err is file not found. Can be used with os.Open* file not found

func OsVersion

func OsVersion() (version string, hasVersion bool, err error)

OsVersion for linux returns version: "Linux 5.15.0-56-generic"

func Processor

func Processor() (model string, err error)

Processor returns human readable string like "Intel(R) Core(TM) i5-6267U CPU @ 2.90GHz"