1ASSERT(3P)                 POSIX Programmer's Manual                ASSERT(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       assert — insert program diagnostics
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SYNOPSIS

16       #include <assert.h>
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18       void assert(scalar expression);
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DESCRIPTION

21       The functionality described on this reference page is aligned with  the
22       ISO C  standard.  Any  conflict between the requirements described here
23       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2008
24       defers to the ISO C standard.
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26       The  assert()  macro  shall  insert diagnostics into programs; it shall
27       expand to a void expression. When it is executed, if expression  (which
28       shall  have  a  scalar  type)  is false (that is, compares equal to 0),
29       assert() shall write information about the particular call that  failed
30       on stderr and shall call abort().
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32       The  information  written  about the call that failed shall include the
33       text of the argument, the name of the source file, the source file line
34       number, and the name of the enclosing function; the latter are, respec‐
35       tively, the values of the preprocessing macros  __FILE__  and  __LINE__
36       and of the identifier __func__.
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38       Forcing  a definition of the name NDEBUG, either from the compiler com‐
39       mand line or with the preprocessor  control  statement  #define  NDEBUG
40       ahead  of the #include <assert.h> statement, shall stop assertions from
41       being compiled into the program.
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RETURN VALUE

44       The assert() macro shall not return a value.
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ERRORS

47       No errors are defined.
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49       The following sections are informative.
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EXAMPLES

52       None.
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APPLICATION USAGE

55       None.
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RATIONALE

58       None.
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FUTURE DIRECTIONS

61       None.
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SEE ALSO

64       abort(), stdin
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66       The Base Definitions volume of POSIX.1‐2008, <assert.h>
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69       Portions of this text are reprinted and reproduced in  electronic  form
70       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
71       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
72       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
73       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
74       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) In the
75       event of any discrepancy between this version and the original IEEE and
76       The  Open Group Standard, the original IEEE and The Open Group Standard
77       is the referee document. The original Standard can be  obtained  online
78       at http://www.unix.org/online.html .
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80       Any  typographical  or  formatting  errors that appear in this page are
81       most likely to have been introduced during the conversion of the source
82       files  to  man page format. To report such errors, see https://www.ker‐
83       nel.org/doc/man-pages/reporting_bugs.html .
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87IEEE/The Open Group                  2013                           ASSERT(3P)
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