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var cp = require('child_process')
var fs = require('fs')
var path = require('path')
/**
* Returns the operating system's CPU architecture. This is different than
* `process.arch` or `os.arch()` which returns the architecture the Node.js (or
* Electron) binary was compiled for.
*/
module.exports = function arch () {
/**
* The running binary is 64-bit, so the OS is clearly 64-bit.
*/
if (process.arch === 'x64') {
return 'x64'
}
/**
* All recent versions of Mac OS are 64-bit.
*/
if (process.platform === 'darwin') {
return 'x64'
}
/**
* On Windows, the most reliable way to detect a 64-bit OS from within a 32-bit
* app is based on the presence of a WOW64 file: %SystemRoot%\SysNative.
* See: https://twitter.com/feross/status/776949077208510464
*/
if (process.platform === 'win32') {
var useEnv = false
try {
useEnv = !!(process.env.SYSTEMROOT && fs.statSync(process.env.SYSTEMROOT))
} catch (err) {}
var sysRoot = useEnv ? process.env.SYSTEMROOT : 'C:\\Windows'
// If %SystemRoot%\SysNative exists, we are in a WOW64 FS Redirected application.
var isWOW64 = false
try {
isWOW64 = !!fs.statSync(path.join(sysRoot, 'sysnative'))
} catch (err) {}
return isWOW64 ? 'x64' : 'x86'
}
/**
* On Linux, use the `getconf` command to get the architecture.
*/
if (process.platform === 'linux') {
var output = cp.execSync('getconf LONG_BIT', {encoding: 'utf8'})
return output === '64\n' ? 'x64' : 'x86'
}
/**
* If none of the above, assume the architecture is 32-bit.
*/
return 'x86'
}
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