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NetBSD 6.1.5 - man page for assert (netbsd section 3)

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ASSERT(3)			   BSD Library Functions Manual 			ASSERT(3)

NAME
     assert -- expression verification macro

SYNOPSIS
     #include <assert.h>

     assert(expression);

DESCRIPTION
     The assert() macro tests the given expression and if it is false, the calling process is
     terminated.  A diagnostic message, consisting of the text of the expression, the name of the
     source file, the line number and the enclosing function, is written to stderr and the
     abort(3) function is called, effectively terminating the program.

     If expression is true, the assert() macro does nothing.

     The assert() macro may be removed at compile time with the cc(1) option -DNDEBUG.

DIAGNOSTICS
     The following diagnostic message is written to stderr if expression is false:

	   "assertion \"%s\" failed: file \"%s\", line %d, function \"%s\"\n", \
			       "expression", __FILE__, __LINE__, __func__);

SEE ALSO
     cc(1), _DIAGASSERT(3), abort(3)

STANDARDS
     The assert() macro conforms to ISO/IEC 9899:1999 (``ISO C99'').

HISTORY
     A assert macro appeared in Version 6 AT&T UNIX.

     Information on the name of the enclosing function appeared in ISO/IEC 9899:1999
     (``ISO C99'').

BSD					 January 22, 2007				      BSD
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