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Command: assert | Section: 3 | Source: OpenBSD | 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 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\n", \
"expression", __FILE__, __LINE__);
SEE ALSO
cc(1), abort(3)
STANDARDS
The assert() macro conforms to ANSI X3.159-1989 ("ANSI C89").
HISTORY
An assert() macro first appeared in Version 7 AT&T UNIX.
FreeBSD 14.1-RELEASE-p8 December 10, 2014 FreeBSD 14.1-RELEASE-p8