1FERAISEEXCEPT(3P)          POSIX Programmer's Manual         FERAISEEXCEPT(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       feraiseexcept — raise floating-point exception
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SYNOPSIS

16       #include <fenv.h>
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18       int feraiseexcept(int excepts);
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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  feraiseexcept()  function  shall  attempt  to  raise the supported
27       floating-point exceptions represented by  the  argument  excepts.   The
28       order  in  which these floating-point exceptions are raised is unspeci‐
29       fied. Whether the  feraiseexcept()  function  additionally  raises  the
30       inexact  floating-point  exception  whenever  it raises the overflow or
31       underflow floating-point exception is implementation-defined.
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RETURN VALUE

34       If the argument is zero or if all the specified  exceptions  were  suc‐
35       cessfully  raised,  feraiseexcept()  shall  return  zero. Otherwise, it
36       shall return a non-zero value.
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ERRORS

39       No errors are defined.
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41       The following sections are informative.
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EXAMPLES

44       None.
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APPLICATION USAGE

47       The effect is intended to be similar to that of  floating-point  excep‐
48       tions  raised by arithmetic operations. Hence, enabled traps for float‐
49       ing-point exceptions raised by this function are taken.
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RATIONALE

52       Raising overflow or underflow is allowed to also raise inexact  because
53       on  some  architectures the only practical way to raise an exception is
54       to execute an instruction that has the exception as a side-effect.  The
55       function  is not restricted to accept only valid coincident expressions
56       for atomic operations, so the function can be used to raise  exceptions
57       accrued over several operations.
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FUTURE DIRECTIONS

60       None.
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SEE ALSO

63       feclearexcept(), fegetexceptflag(), fetestexcept()
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65       The Base Definitions volume of POSIX.1‐2008, <fenv.h>
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68       Portions  of  this text are reprinted and reproduced in electronic form
69       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
70       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
71       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
72       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
73       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
74       event of any discrepancy between this version and the original IEEE and
75       The Open Group Standard, the original IEEE and The Open Group  Standard
76       is  the  referee document. The original Standard can be obtained online
77       at http://www.unix.org/online.html .
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79       Any typographical or formatting errors that appear  in  this  page  are
80       most likely to have been introduced during the conversion of the source
81       files to man page format. To report such errors,  see  https://www.ker‐
82       nel.org/doc/man-pages/reporting_bugs.html .
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86IEEE/The Open Group                  2013                    FERAISEEXCEPT(3P)
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