node.js 中 process.on('SIGINT') 的 Windows 等价物是什么？
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What is the Windows equivalent of process.on('SIGINT') in node.js?
提问by pappadog
I'm following the guidance here(listening for SIGINTevents) to gracefully shutdown my Windows-8-hosted node.js application in response to Ctrl+Cor server shutdown.
我正在按照此处的指南（侦听SIGINT事件）优雅地关闭我的 Windows-8 托管的 node.js 应用程序以响应Ctrl+C或服务器关闭。
But Windows doesn't have SIGINT. I also tried process.on('exit'), but that seems to late to do anything productive.
但是 Windows 没有SIGINT. 我也试过process.on('exit')，但做任何有成效的事情似乎都晚了。
On Windows, this code gives me: Error: No such module
在 Windows 上，此代码给了我：错误：没有这样的模块
process.on( 'SIGINT', function() {
console.log( "\ngracefully shutting down from SIGINT (Crtl-C)" )
// wish this worked on Windows
process.exit( )
})
On Windows, this code runs, but is too late to do anything graceful:
在 Windows 上，此代码运行，但为时已晚，无法做任何优雅的事情：
process.on( 'exit', function() {
console.log( "never see this log message" )
})
Is there a SIGINTequivalent event on Windows?
SIGINTWindows 上是否有等效的事件？
回答by Gabriel Llamas
You have to use the readline module and listen for a SIGINT event:
您必须使用 readline 模块并侦听 SIGINT 事件：
http://nodejs.org/api/readline.html#readline_event_sigint
http://nodejs.org/api/readline.html#readline_event_signt
if (process.platform === "win32") {
var rl = require("readline").createInterface({
input: process.stdin,
output: process.stdout
});
rl.on("SIGINT", function () {
process.emit("SIGINT");
});
}
process.on("SIGINT", function () {
//graceful shutdown
process.exit();
});
回答by Meirion Hughes
I'm not sure as of when, but on node 8.x and on Windows 10 the original question code simply works now.
我不确定什么时候，但在节点 8.x 和 Windows 10 上，原始问题代码现在可以正常工作。
process.on( "SIGINT", function() {
console.log( "\ngracefully shutting down from SIGINT (Crtl-C)" );
process.exit();
} );
process.on( "exit", function() {
console.log( "never see this log message" );
} );
setInterval( () => console.log( "tick" ), 2500 );
also works with a windows command prompt.
也适用于 Windows 命令提示符。
回答by tfmontague
Unless you need the "readline" import for other tasks, I would suggest importing "readline" once the program has verified that it's running on Windows. Additionally, for those who might be unaware - this works on both Windows 32-bit and Windows 64-bit systems (which will return the keyword "win32"). Thanks for this solution Gabriel.
除非您需要为其他任务导入“readline”，否则我建议在程序验证它在 Windows 上运行后导入“readline”。此外，对于那些可能不知道的人 - 这适用于 Windows 32 位和 Windows 64 位系统（将返回关键字“win32”）。感谢这个解决方案加布里埃尔。
if (process.platform === "win32") {
require("readline")
.createInterface({
input: process.stdin,
output: process.stdout
})
.on("SIGINT", function () {
process.emit("SIGINT");
});
}
process.on("SIGINT", function () {
// graceful shutdown
process.exit();
});
回答by Pero P.
Currently there is still no support in node for capturing the windows console control events, so there are no equivalents to the POSIX signals:
目前 node 中仍然不支持捕获 windows 控制台控制事件，因此没有与 POSIX 信号等效的信号：
https://github.com/joyent/node/issues/1553
https://github.com/joyent/node/issues/1553
However the tty module documentationdoes give an example of a mechanism to capture the key presses in order to initiate a graceful shutdown, but then this does only work for ctrl+c.
然而tty 模块文档确实给出了一个机制的例子，用于捕获按键以启动正常关闭，但这仅适用于ctrl+ c。
var tty = require('tty');
process.stdin.resume();
tty.setRawMode(true);
process.stdin.on('keypress', function(char, key) {
if (key && key.ctrl && key.name == 'c') {
console.log('graceful exit of process %d', process.pid);
process.exit();
}
});
回答by Heinrich Ulbricht
Nowadays it just workson all platforms, including Windows.
现在它只适用于所有平台，包括 Windows。
The following code logs and then terminates properly on Windows 10:
以下代码记录然后在 Windows 10 上正确终止：
process.on('SIGINT', () => {
console.log("Terminating...");
process.exit(0);
});
回答by mekwall
Since node.js 0.8 the keypressevent no longer exists. There is however an npm package called keypressthat reimplements the event.
从 node.js 0.8 开始，该keypress事件不再存在。然而，有一个名为keypress的 npm 包可以重新实现该事件。
Install with npm install keypress, then do something like:
安装npm install keypress，然后执行以下操作：
// Windows doesn't use POSIX signals
if (process.platform === "win32") {
const keypress = require("keypress");
keypress(process.stdin);
process.stdin.resume();
process.stdin.setRawMode(true);
process.stdin.setEncoding("utf8");
process.stdin.on("keypress", function(char, key) {
if (key && key.ctrl && key.name == "c") {
// Behave like a SIGUSR2
process.emit("SIGUSR2");
} else if (key && key.ctrl && key.name == "r") {
// Behave like a SIGHUP
process.emit("SIGHUP");
}
});
}
