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package vsock

import (

"fmt"

"os"

"golang.org/x/sys/unix"

)

// contextID retrieves the local context ID for this system.

func contextID() (uint32, error) {

f, err := os.Open(devVsock)

if err != nil {

return 0, err

}

defer f.Close()

return unix.IoctlGetUint32(int(f.Fd()), unix.IOCTL_VM_SOCKETS_GET_LOCAL_CID)

}

// isErrno determines if an error a matches UNIX error number.

func isErrno(err error, errno int) bool {

switch errno {

case ebadf:

return err == unix.EBADF

case enotconn:

return err == unix.ENOTCONN

default:

panicf("vsock: isErrno called with unhandled error number parameter: %d", errno)

return false

}

}

func panicf(format string, a ...any) {

panic(fmt.Sprintf(format, a...))

}