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95 lines
2.1 KiB
95 lines
2.1 KiB
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const os = require('os');
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const util = require('util');
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const spawn = require('child_process').spawn;
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// We're trying to reproduce:
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// $ echo "hello\nnode\nand\nworld" | grep o | sed s/o/a/
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var grep, sed, echo;
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if (common.isWindows) {
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grep = spawn('grep', ['--binary', 'o']),
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sed = spawn('sed', ['--binary', 's/o/O/']),
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echo = spawn('cmd.exe',
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['/c', 'echo', 'hello&&', 'echo',
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'node&&', 'echo', 'and&&', 'echo', 'world']);
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} else {
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grep = spawn('grep', ['o']),
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sed = spawn('sed', ['s/o/O/']),
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echo = spawn('echo', ['hello\nnode\nand\nworld\n']);
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}
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/*
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* grep and sed hang if the spawn function leaks file descriptors to child
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* processes.
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* This happens when calling pipe(2) and then forgetting to set the
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* FD_CLOEXEC flag on the resulting file descriptors.
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*
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* This test checks child processes exit, meaning they don't hang like
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* explained above.
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*/
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// pipe echo | grep
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echo.stdout.on('data', function(data) {
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console.error('grep stdin write ' + data.length);
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if (!grep.stdin.write(data)) {
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echo.stdout.pause();
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}
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});
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grep.stdin.on('drain', function(data) {
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echo.stdout.resume();
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});
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// propagate end from echo to grep
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echo.stdout.on('end', function(code) {
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grep.stdin.end();
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});
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echo.on('exit', function() {
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console.error('echo exit');
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});
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grep.on('exit', function() {
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console.error('grep exit');
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});
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sed.on('exit', function() {
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console.error('sed exit');
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});
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// pipe grep | sed
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grep.stdout.on('data', function(data) {
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console.error('grep stdout ' + data.length);
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if (!sed.stdin.write(data)) {
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grep.stdout.pause();
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}
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});
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sed.stdin.on('drain', function(data) {
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grep.stdout.resume();
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});
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// propagate end from grep to sed
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grep.stdout.on('end', function(code) {
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console.error('grep stdout end');
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sed.stdin.end();
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});
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var result = '';
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// print sed's output
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sed.stdout.on('data', function(data) {
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result += data.toString('utf8', 0, data.length);
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util.print(data);
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});
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sed.stdout.on('end', function(code) {
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assert.equal(result, 'hellO' + os.EOL + 'nOde' + os.EOL + 'wOrld' + os.EOL);
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});
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