PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT

ASSERT(3P)                POSIX Programmer's Manual               ASSERT(3P)

PROLOG         top

       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         top

       assert — insert program diagnostics

SYNOPSIS         top

       #include <assert.h>

       void assert(scalar expression);

DESCRIPTION         top

       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,
       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         top

       The assert() macro shall not return a value.

ERRORS         top

       No errors are defined.

       The following sections are informative.

EXAMPLES         top

       None.

APPLICATION USAGE         top

       None.

RATIONALE         top

       None.

FUTURE DIRECTIONS         top

       None.

SEE ALSO         top

       abort(3p), stdin(3p)

       The Base Definitions volume of POSIX.1‐2008, assert.h(0p)

COPYRIGHT         top

       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013                          ASSERT(3P)

Pages that refer to this page: assert.h(0p)