Cannot get Uname by golang

Question

I'm using golang 1.4.2 on Mac

I want to use Uname to get some information, followings are my codes:

package main

import (
  "syscall"
)

func main() {
  utsname := syscall.Utsname{}
  syscall.Uname(&utsname)
}

But I got these errors:

# command-line-arguments
./main.go:8: undefined: syscall.Utsname
./main.go:9: undefined: syscall.Uname

Any went wrong?

It doesn't look like you're doing something wrong. Can you make sure your Go version is 1.4.2 by running `go version`? — fuz, Apr 02 '15 at 14:52
check `go env` too, making sure GOARCH and GOOS are correct. — JimB, Apr 02 '15 at 14:53
buy my `goroot` is `GOROOT="/usr/local/Cellar/go/1.4/libexec"` — waitingkuo, Apr 02 '15 at 14:55
my `goroot` is now GOROOT="/usr/local/Cellar/go/1.4.2/libexec" after opening a new terminal tab. But I still got the same errors — waitingkuo, Apr 02 '15 at 14:59

score 8 · Answer 1 · answered Apr 02 '15 at 15:54

TL;DR Uname and Utsname are not available for OSX.

The reason is because those functions are not defined for the operating system.

Reading the documentation for syscall this jumped at me:

The details vary depending on the underlying system, and by default, godoc will display the syscall documentation for the current system. If you want godoc to display syscall documentation for another system, set $GOOS and $GOARCH to the desired system.

Running godoc syscall on my Mac yielded the sycall documentation which does not include the Utsname type nor the Uname function call.

However, running GOOS=linux GOARCH=amd64 godoc syscall actually shows the Utsname and Uname.

Also, note that the package itself is locked down in favor of OS specific packages

https://golang.org/pkg/syscall/ => https://godoc.org/golang.org/x/sys

score 1 · Answer 2 · answered Jun 09 '21 at 03:07

(Adding a more direct answer with exactly how I got past this problem)

Instead of importing syscall, I imported golang.org/x/sys/unix.

Then, the following code-block:

u := syscall.Utsname{}
syscall.Uname(&u)

is replaced by:

u := unix.Utsname{}
unix.Uname(&u)

NOTE! You need to call relevant functions for Windows.

Relevant contents of git diff:

-       "syscall"
+       "golang.org/x/sys/unix"

-       utsname := syscall.Utsname{}
-       syscall.Uname(&utsname)
+       utsname := unix.Utsname{}
+       unix.Uname(&utsname)

Cannot get Uname by golang

2 Answers2