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112 lines
4.3 KiB
HTML
112 lines
4.3 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>assert (The Red Hat newlib C Library)</title>
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<meta name="description" content="assert (The Red Hat newlib C Library)">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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<link href="atexit.html#atexit" rel="next" title="atexit">
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</head>
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<body lang="en">
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<a name="assert"></a>
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<div class="header">
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<p>
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Next: <a href="atexit.html#atexit" accesskey="n" rel="next">atexit</a>, Previous: <a href="abs.html#abs" accesskey="p" rel="prev">abs</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="assert_002d_002d_002dmacro-for-debugging-diagnostics"></a>
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<h3 class="section">2.5 <code>assert</code>—macro for debugging diagnostics</h3>
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<a name="index-assert"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <assert.h>
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void assert(int <var>expression</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use this macro to embed debuggging diagnostic statements in
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your programs. The argument <var>expression</var> should be an
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expression which evaluates to true (nonzero) when your program
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is working as you intended.
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</p>
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<p>When <var>expression</var> evaluates to false (zero), <code>assert</code>
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calls <code>abort</code>, after first printing a message showing what
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failed and where:
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</p>
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<div class="smallexample">
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<pre class="smallexample"> Assertion failed: <var>expression</var>, file <var>filename</var>, line <var>lineno</var>, function: <var>func</var>
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</pre></div>
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<p>If the name of the current function is not known (for example,
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when using a C89 compiler that does not understand __func__),
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the function location is omitted.
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</p>
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<p>The macro is defined to permit you to turn off all uses of
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<code>assert</code> at compile time by defining <code>NDEBUG</code> as a
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preprocessor variable. If you do this, the <code>assert</code> macro
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expands to
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</p>
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<div class="smallexample">
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<pre class="smallexample"> (void(0))
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</pre></div>
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<br>
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<p><strong>Returns</strong><br>
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<code>assert</code> does not return a value.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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The <code>assert</code> macro is required by ANSI, as is the behavior
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when <code>NDEBUG</code> is defined.
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</p>
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<p>Supporting OS subroutines required (only if enabled): <code>close</code>, <code>fstat</code>,
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<code>getpid</code>, <code>isatty</code>, <code>kill</code>, <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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</html>
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