[英]nodejs: child_process.spawn not reporting exit code
While writting unit tests for a simple tool, I was unable to get the process exit code of a child process started with require('child_process').spawn
. 在为一个简单的工具编写单元测试时,我无法获得以require('child_process').spawn
开始的子进程的进程退出代码require('child_process').spawn
。 To simplify if down, consider this simple node command which exits with code 35: 要简化if down,请考虑使用代码35退出的简单节点命令:
SHELL> node -e "process.exit(35)" & [1] 23427 [1]+ Saída 35 node -e "process.exit(35)"
Now consider the following file, where the command above is executed with exec
and with spawn
. 现在考虑以下文件,其中上面的命令是用exec
和spawn
执行的。 The target is catching the exit code: 目标是捕获退出代码:
SHELL> cat WTF.js var cp = require('child_process'); cp.exec('node -e "process.exit(35);"', function(err){ console.log('child exit code (exec)', err.code); }); cp.spawn('node', ['-e', '"process.exit(35);"']).on('exit', function(code){ console.log('child exit code (spawn)', code); });
But when it's run... surprise: 但是当它运行时......惊喜:
SHELL> node WTF.js child exit code (exec) 35 child exit code (spawn) 0
SHELL> node --version v6.0.0
Remove the double quotes from the second parameter for spawn()
, the spawn()
will automatically take care of making sure the parameter is not accidentally separated due to spaces, etc: 从spawn()
的第二个参数中删除双引号, spawn()
将自动确保参数不会因空格等而意外分离:
cp.spawn('node', ['-e', 'process.exit(35);'])
.on('exit', function(code){
console.log('child exit code (spawn)', code);
});
Otherwise node treats the passed (js) code literally as "process.exit(35);"
否则节点将传递的(js)代码字面上视为"process.exit(35);"
(a string literal) which is basically a no-op and so it exits with code 0. (一个字符串文字),它基本上是一个无操作,所以它以代码0退出。
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