ASSERT(3P) POSIX Programmer's Manual ASSERT(3P)PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAMEassert - insert program diagnostics
void assert(scalar expression);
The assert() macro shall insert diagnostics into programs; it shall
expand to a void expression. When it is executed, if expression (which
shall have a scalar type) is false (that is, compares equal to 0),
assert() shall write information about the particular call that failed
on stderr and shall call abort().
The information written about the call that failed shall include the
text of the argument, the name of the source file, the source file line
number, and the name of the enclosing function; the latter are, respec‐
tively, the values of the preprocessing macros __FILE__ and __LINE__
and of the identifier __func__.
Forcing a definition of the name NDEBUG, either from the compiler com‐
mand line or with the preprocessor control statement #define NDEBUG
ahead of the #include <assert.h> statement, shall stop assertions from
being compiled into the program.
The assert() macro shall not return a value.
No errors are defined.
The following sections are informative.
SEE ALSOabort(), stderr, the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 ASSERT(3P)