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