28 lines
973 B
JavaScript
28 lines
973 B
JavaScript
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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const { spawn } = require('child_process');
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// Check that, once a child process has ended, it’s safe to read from a pipe
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// that the child had used as input.
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// We simulate that using cat | (head -n1; ...)
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const p1 = spawn('cat', { stdio: ['pipe', 'pipe', 'inherit'] });
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const p2 = spawn('head', ['-n1'], { stdio: [p1.stdout, 'pipe', 'inherit'] });
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// First, write the line that gets passed through p2, making 'head' exit.
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p1.stdin.write('hello\n');
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p2.stdout.setEncoding('utf8');
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p2.stdout.on('data', common.mustCall((chunk) => {
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assert.strictEqual(chunk, 'hello\n');
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}));
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p2.on('exit', common.mustCall(() => {
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// We can now use cat’s output, because 'head' is no longer reading from it.
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p1.stdin.end('world\n');
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p1.stdout.setEncoding('utf8');
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p1.stdout.on('data', common.mustCall((chunk) => {
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assert.strictEqual(chunk, 'world\n');
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}));
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p1.stdout.resume();
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}));
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