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    <p>There's a function from Apple to detect whether a program is being debugged in the <em>Technical Q&amp;A 1361</em> (<a href="https://developer.apple.com/library/mac/qa/qa2004/qa1361.html" rel="noreferrer">entry in Mac library</a> and <a href="https://developer.apple.com/library/ios/qa/qa1361/_index.html" rel="noreferrer">entry in iOS library</a>; they are identical). </p> <p>Code from the Technical Q&amp;A:</p> <pre><code>#include &lt;assert.h&gt; #include &lt;stdbool.h&gt; #include &lt;sys/types.h&gt; #include &lt;unistd.h&gt; #include &lt;sys/sysctl.h&gt; static bool AmIBeingDebugged(void) // Returns true if the current process is being debugged (either // running under the debugger or has a debugger attached post facto). { int junk; int mib[4]; struct kinfo_proc info; size_t size; // Initialize the flags so that, if sysctl fails for some bizarre // reason, we get a predictable result. info.kp_proc.p_flag = 0; // Initialize mib, which tells sysctl the info we want, in this case // we're looking for information about a specific process ID. mib[0] = CTL_KERN; mib[1] = KERN_PROC; mib[2] = KERN_PROC_PID; mib[3] = getpid(); // Call sysctl. size = sizeof(info); junk = sysctl(mib, sizeof(mib) / sizeof(*mib), &amp;info, &amp;size, NULL, 0); assert(junk == 0); // We're being debugged if the P_TRACED flag is set. return ( (info.kp_proc.p_flag &amp; P_TRACED) != 0 ); } </code></pre> <p>Also pay attention to this note at the end of the Q&amp;A:</p> <blockquote> <p><strong>Important:</strong> Because the definition of the <code>kinfo_proc</code> structure (in <code>&lt;sys/sysctl.h&gt;</code>) is conditionalized by <code>__APPLE_API_UNSTABLE</code>, you should restrict use of the above code to the debug build of your program.</p> </blockquote>
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    1. COThere's one thing that I don't understand in that document... After the code it says: "Because the definition of the kinfo_proc structure (in <sys/sysctl.h>) is conditionalized by __APPLE_API_UNSTABLE, you should restrict use of the above code to the debug build of your program.". So... what's the point of the code if I can include it only in the debug build? If I can use it only in the debug build... it means that I know already that I'm in the debug build...
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    2. COThe question was not about a whether a _build_ is a _debug build_ but whether the app is _running in a debugger_. The question already assumes that a debug build is made and run and then just wants to decide what to do with the log messages. You're right that document in effect says you should not use this technique in a release build that you ship to customers.
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    3. COthanks for the clarification. I was hoping to use your suggestion to solve a similar issue that I'm having (http://stackoverflow.com/questions/12406831/check-for-release-build-at-runtime). Unfortunately it doesn't look like the right one then...
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