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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 differ (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 functionality described on this reference page is aligned with  the
       ISO C  standard.  Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1-2008
       defers to the ISO C standard.
       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.
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(), stdin
       The Base Definitions volume of POSIX.1-2008, <assert.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                           ASSERT(3P)