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Command: assert | Section: 3 | Source: NetBSD | File: assert.3
ASSERT(3) FreeBSD 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 7 AT&T UNIX.
Information on the name of the enclosing function appeared in ISO/IEC
9899:1999 ("ISO C99").
FreeBSD 14.1-RELEASE-p8 June 1, 2016 FreeBSD 14.1-RELEASE-p8