| // Copyright Joyent, Inc. and other Node contributors. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to permit |
| // persons to whom the Software is furnished to do so, subject to the |
| // following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN |
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| // USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| var is_windows = process.platform === 'win32'; |
| |
| var common = require('../common'); |
| var assert = require('assert'), |
| util = require('util'), |
| spawn = require('child_process').spawn; |
| |
| // We're trying to reproduce: |
| // $ echo "hello\nnode\nand\nworld" | grep o | sed s/o/a/ |
| |
| var grep = spawn('grep', ['o']), |
| sed = spawn('sed', ['s/o/O/']), |
| echo; |
| |
| if (is_windows) { |
| echo = spawn('cmd.exe', |
| ['/c', 'echo', 'hello&&', 'echo', |
| 'node&&', 'echo', 'and&&', 'echo', 'world']); |
| } else { |
| echo = spawn('echo', ['hello\nnode\nand\nworld\n']); |
| } |
| |
| /* |
| * grep and sed hang if the spawn function leaks file descriptors to child |
| * processes. |
| * This happens when calling pipe(2) and then forgetting to set the |
| * FD_CLOEXEC flag on the resulting file descriptors. |
| * |
| * This test checks child processes exit, meaning they don't hang like |
| * explained above. |
| */ |
| |
| |
| |
| // pipe echo | grep |
| echo.stdout.on('data', function(data) { |
| console.error('grep stdin write ' + data.length); |
| if (!grep.stdin.write(data)) { |
| echo.stdout.pause(); |
| } |
| }); |
| |
| grep.stdin.on('drain', function(data) { |
| echo.stdout.resume(); |
| }); |
| |
| // propagate end from echo to grep |
| echo.stdout.on('end', function(code) { |
| grep.stdin.end(); |
| }); |
| |
| echo.on('exit', function() { |
| console.error('echo exit'); |
| }); |
| |
| grep.on('exit', function() { |
| console.error('grep exit'); |
| }); |
| |
| sed.on('exit', function() { |
| console.error('sed exit'); |
| }); |
| |
| |
| |
| // pipe grep | sed |
| grep.stdout.on('data', function(data) { |
| console.error('grep stdout ' + data.length); |
| if (!sed.stdin.write(data)) { |
| grep.stdout.pause(); |
| } |
| }); |
| |
| sed.stdin.on('drain', function(data) { |
| grep.stdout.resume(); |
| }); |
| |
| // propagate end from grep to sed |
| grep.stdout.on('end', function(code) { |
| console.error('grep stdout end'); |
| sed.stdin.end(); |
| }); |
| |
| |
| |
| var result = ''; |
| |
| // print sed's output |
| sed.stdout.on('data', function(data) { |
| result += data.toString('utf8', 0, data.length); |
| util.print(data); |
| }); |
| |
| sed.stdout.on('end', function(code) { |
| assert.equal(result, 'hellO\nnOde\nwOrld\n'); |
| }); |