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POCreating a simple Hello World tool that runs as a daemon
 

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  1. POCreating a simple Hello World tool that runs as a daemon
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    <p>I built the Command Line tool (Foundation) template in Xcode. It just logs "Hello World" to the console.There is only one class in it main.m. Here's the code:</p> <blockquote> <pre><code>#import &lt;Foundation/Foundation.h&gt; int main (int argc, const char * argv[]) </code></pre> <p>{</p> <pre><code> @autoreleasepool { // insert code here... NSLog(@"Hello, World!"); } return 0; </code></pre> <p>}</p> </blockquote> <p>Now I want to run it as a daemon and log "Hello World" to the console every 10 seconds. So I moved the product/binary to <em>/tmp</em> on my Mac. I created the following plist for launchd:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt; &lt;plist version="1.0"&gt; &lt;dict&gt; &lt;key&gt;Label&lt;/key&gt; &lt;string&gt;helloDaemon&lt;/string&gt; &lt;key&gt;ProgramArguments&lt;/key&gt; &lt;array&gt; &lt;string&gt;/tmp/helloDaemon&lt;/string&gt; &lt;/array&gt; &lt;key&gt;StartInterval&lt;/key&gt; &lt;integer&gt;10&lt;/integer&gt; &lt;/dict&gt; &lt;/plist&gt; </code></pre> <p>I loaded the plist using launchctl, but I do not see any "Hello World"s in the console. Instead, I get this:</p> <pre><code>11/03/2012 00:55:35.141 com.apple.launchd: (helloDaemon) Throttling respawn: Will start in 1 seconds 11/03/2012 00:55:45.141 com.apple.launchd: (helloDaemon) Throttling respawn: Will start in 2 seconds 11/03/2012 00:55:55.140 com.apple.launchd: (helloDaemon) Throttling respawn: Will start in 3 seconds </code></pre> <p>So what's going wrong?</p>
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    1. COWhere did you install the launchd plist?
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      1. USRob Keniger
    2. CO@RobKeniger I used `launchctl` to install the plist. Also as I loaded it as the root user (using sudo) it should had been installed in /Library/LaunchDaemons. But well, my plist was not copied in that directory (I think only the daemons which start at reboot are placed there). So I manually copied it over to /Library/LaunchDaemons, but still no luck.
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    3. CO@RobKeniger But I think it was loaded correctly by launchctl. When I type `sudo launchctl list`, it lists my daemon with status 0.
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