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”).