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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 dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       assert - insert program diagnostics

SYNOPSIS
       #include <assert.h>

       void assert(scalar expression);


DESCRIPTION
       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, respectively,
       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 command 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.

RETURN VALUE
       The assert() macro shall not return a value.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       abort(), stderr, the Base Definitions volume of IEEE Std 1003.1-2001, <assert.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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)