1'use strict'; 2const common = require('../common'); 3 4if (common.isWindows) { 5 // https://github.com/nodejs/node/issues/48300 6 common.skip('Does not work with cygwin quirks on Windows'); 7} 8 9const assert = require('assert'); 10const { spawn } = require('child_process'); 11 12// Check that, once a child process has ended, it’s safe to read from a pipe 13// that the child had used as input. 14// We simulate that using cat | (head -n1; ...) 15 16const p1 = spawn('cat', { stdio: ['pipe', 'pipe', 'inherit'] }); 17const p2 = spawn('head', ['-n1'], { stdio: [p1.stdout, 'pipe', 'inherit'] }); 18 19// First, write the line that gets passed through p2, making 'head' exit. 20p1.stdin.write('hello\n'); 21p2.stdout.setEncoding('utf8'); 22p2.stdout.on('data', common.mustCall((chunk) => { 23 assert.strictEqual(chunk, 'hello\n'); 24})); 25p2.on('exit', common.mustCall(() => { 26 // We can now use cat’s output, because 'head' is no longer reading from it. 27 p1.stdin.end('world\n'); 28 p1.stdout.setEncoding('utf8'); 29 p1.stdout.on('data', common.mustCall((chunk) => { 30 assert.strictEqual(chunk, 'world\n'); 31 })); 32 p1.stdout.resume(); 33})); 34