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/*! arch. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */ | |
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' | |
} | |