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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Darwin/index.html">Darwin</a> > <a href="../../samplecode/Darwin/idxInterprocessCommunication-date.html">Interprocess Communication</a> > <A HREF="javascript:location.replace('index.html');">NotifyTool</A> >
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<p><strong><a href="NotifyTool.zip">Download Sample</a></strong> (“NotifyTool.zip”, 8.0K)<BR>
<strong><a href="NotifyTool.dmg">Download Sample</a></strong> (“NotifyTool.dmg”, 61.0K)</p>
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<pre class="sourcecodebox">Read Me About NotifyTool
========================
1.0
NotifyTool is a simple example of how to use the BSD notify API
<x-man-page://3/notify>. It shows how to post notifications, and how to receive
them using a file descriptor, using a Mach port, and from a runloop.
The notify API was introduced in Mac OS X 10.3. In theory, this code could run
back to that release. However, to simplify development and testing, the sample
currently only supports Mac OS X 10.4 and later.
Packing List
------------
The sample contains the following items:
o Read Me About NotifyTool.txt -- This file.
o NotifyTool.c -- C source code for the program.
o NotifyTool.xcodeproj -- An Xcode 2.4.1 project for the program.
o build -- A built version of the above.
Using the Sample
----------------
To listen for a notification, open a Terminal window, change into the sample
directory, and run the tool with the "listen" command:
$ build/Debug/NotifyTool listen foo
Listening using a file descriptor:
The tool will run forever, waiting for the notification to be posted. To post
a notification, open another Terminal window and use the "post" command:
$ build/Debug/NotifyTool post foo
You'll see the notification show up in the listening window.
$ build/Debug/NotifyTool listen foo
Listening using a file descriptor:
foo (0)
Use ^C to quit the listener.
You can listen for and post multiple notifications:
$ build/Debug/NotifyTool listen foo bar baz
Listening using a file descriptor:
$ build/Debug/NotifyTool post foo baz
$ build/Debug/NotifyTool listen foo bar baz
Listening using a file descriptor:
foo (0)
baz (2)
By default the listen command listens using a file descriptor. You can also
listen using raw Mach APIs or using CoreFoundation APIs to integrate with the
runloop:
$ build/Debug/NotifyTool listenMach foo bar baz
Listening using Mach:
foo (0)
baz (2)
^C
$ build/Debug/NotifyTool listenCF foo bar baz
Listening using Core Foundation:
foo (0)
baz (2)
^C
Building the Sample
-------------------
The sample was built using Xcode 2.4.1 on Mac OS X 10.4.10. You should be able
to just open the project and choose Build from the Build menu. This will build
the NotifyTool command line tool in the "build" directory.
How it Works
------------
The implementation is just a straightforward use of the <x-man-page://3/notify>
API. For more details, see the comments in the source code.
Caveats
-------
Certain system software versions will error if you listen for two notifications
on the same file descriptor. For example:
$ ./NotifyTool listen foo bar baz
registration failed: bar: NOTIFY_STATUS_INVALID_FILE (4)
This is caused by a bug in notify_register_file_descriptor's support for the
NOTIFY_REUSE flag <rdar://problem/5479205>. The workaround is to either use a
different notification mechanism or to avoid NOTIFY_REUSE (that is, allocate a
new file descriptor for each notification).
There is currently no definitive list of notification keys used by Apple system
software. This will be rectified in a future release of Mac OS X
<rdar://problem/4515110>. Look for the header file <notify_keys.h>.
Credits and Version History
---------------------------
If you find any problems with this sample, mail <[email protected]> and I'll try to
fix them up.
1.0 (Sep 2007) was the first shipping version.
Share and Enjoy.
Apple Developer Technical Support
Core OS/Hardware
13 Sep 2007
</pre>
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