Manual browser: _DIAGASSERT(3)
|_DIAGASSERT(3)||Library Functions Manual||_DIAGASSERT(3)|
NAME_DIAGASSERT — expression verification macro
DESCRIPTIONThe _DIAGASSERT() macro tests the given expression and if it is false, one or more of the following may occur:
- a diagnostic message may be logged to the system logger with syslog(3). This is default behaviour.
- a diagnostic message may be printed to the stderr stream.
- 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.
ENVIRONMENTThe 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:
DIAGNOSTICSThe diagnostic message has the following format:
"assertion \"%s\" failed: file \"%s\", line %d, function \"%s\"\n", "expression", __FILE__, __LINE__, __func__
HISTORYThe _DIAGASSERT macro appeared in NetBSD 1.5.
|January 22, 2007||NetBSD 7.0|