launchd.plist每10秒运行一次，而不是一次 [英] launchd.plist runs every 10 seconds instead of just once

问题描述

我一直在设置 launchd.plist XML，该XML在每次安装特定的USB设备时都会运行.我按照 xpc_events(3)手册页，无论何时安装设备，它都在运行应用程序.

I have been setting up a launchd.plist XML that is run every time a specific USB device is mounted. I followed the instructions on the xpc_events(3) man page and it is running the application whenever the device is mounted.

我遇到的问题是，只要仍然安装设备，该应用程序就会每10秒钟运行一次.如何设置它，使其仅在将设备插入USB端口时才运行一次?

The problem I'm having is that the application is run again and again every 10 seconds as long as the device is still mounted. How can I set it up so it only runs once when the device is inserted in the USB port?

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.myapp.agent</string>
    <key>Program</key>
    <string>/Applications/MyApp.app/Contents/MacOS/MyAgent</string>
    <key>LaunchEvents</key>
    <dict>
        <key>com.apple.iokit.matching</key>
        <dict>
            <key>com.apple.device-attach</key>
            <dict>
                <key>idVendor</key>
                <integer>2316</integer>
                <key>idProduct</key>
                <integer>4096</integer>
                <key>IOProviderClass</key>
                <string>IOUSBDevice</string>
                <key>IOMatchLaunchStream</key>
                <true/>
            </dict>
        </dict>
        <key>com.apple.notifyd.matching</key>
        <dict>
            <key>com.apple.interesting-notification</key>
            <dict>
                <key>Notification</key>
                <string>com.apple.interesting-notification</string>
            </dict>
        </dict>
    </dict>
</dict>
</plist>

推荐答案

AIUI，您的应用程序必须调用xpc_set_event_stream_handler才能从队列中删除事件.您可能还需要在.plist中添加< key> KeepAlive</key>< false/> ，但是我不确定.

AIUI your application must call xpc_set_event_stream_handler to remove the event from the queue. You might also have to add <key>KeepAlive</key><false/> to the .plist, but I'm not sure about that.

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