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ctassert(9) [netbsd man page]

CTASSERT(9)						   BSD Kernel Developer's Manual					       CTASSERT(9)

CTASSERT -- compile time assertion macro SYNOPSIS
void CTASSERT(expression); DESCRIPTION
The CTASSERT() macro evaluates expression at compile time and causes a compiler error if it is false. The CTASSERT() macro is useful for asserting the size or alignment of important data structures and variables during compilation, which would otherwise cause the code to fail at run time. IMPLEMENTATION NOTES
The CTASSERT() macro should not be used in a header file. It is implemented using a dummy typedef, with a name (based on line number) that may conflict with a CTASSERT() in a source file including that header. EXAMPLES
Assert that the size of the uuid structure is 16 bytes. CTASSERT(sizeof(struct uuid) == 16); SEE ALSO
This manual page was written by Hiten M. Pandya <>. BSD
January 24, 2010 BSD

Check Out this Related Man Page

_DIAGASSERT(3)						   BSD Library Functions Manual 					    _DIAGASSERT(3)

_DIAGASSERT -- expression verification macro SYNOPSIS
#include <assert.h> _DIAGASSERT(expression); DESCRIPTION
The _DIAGASSERT() macro tests the given expression and if it is false, one or more of the following may occur: o a diagnostic message may be logged to the system logger with syslog(3). This is default behaviour. o a diagnostic message may be printed to the stderr stream. o the calling process will be terminated by calling abort(3). This behaviour may be changed by setting the LIBC_DIAGASSERT environment variable (see below). The diagnostic message consists of the text of the expression, the name of the source file, the line number and the enclosing function. If expression is true, the _DIAGASSERT() macro does nothing. The _DIAGASSERT() macro is not compiled in by default, and will only be compiled in with the cc(1) option -D_DIAGNOSTIC. This macro is used in the various system libraries such as the Standard C Library (libc, -lc) to ensure that various library calls are invoked with valid arguments. ENVIRONMENT
The LIBC_DIAGASSERT environment variable can be used to modify the default behaviour of logging the assertion to the system logger. LIBC_DIAGASSERT may be set to one or more of the following characters: a abort(3) once any assertion messages have been logged and/or printed. A Opposite of ``a''. e Print the assertion message to the stderr stream. E Opposite of ``e''. l Log the assertion message with syslog(3) to the facility user.debug. L Opposite of ``l''. DIAGNOSTICS
The diagnostic message has the following format: "assertion "%s" failed: file "%s", line %d, function "%s" ", "expression", __FILE__, __LINE__, __func__ SEE ALSO
cc(1), abort(3), assert(3), syslog(3) HISTORY
The _DIAGASSERT macro appeared in NetBSD 1.5. BSD
January 22, 2007 BSD
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