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

12       feraiseexcept — raise floating-point exception
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SYNOPSIS

15       #include <fenv.h>
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17       int feraiseexcept(int excepts);
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DESCRIPTION

20       The functionality described on this reference page is aligned with  the
21       ISO C  standard.  Any  conflict between the requirements described here
22       and the ISO C standard is unintentional. This  volume  of  POSIX.1‐2017
23       defers to the ISO C standard.
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25       The  feraiseexcept()  function  shall  attempt  to  raise the supported
26       floating-point exceptions represented  by  the  excepts  argument.  The
27       order  in  which these floating-point exceptions are raised is unspeci‐
28       fied, except that if the excepts argument represents  IEC  60559  valid
29       coincident  floating-point  exceptions  for  atomic  operations (namely
30       overflow and inexact, or  underflow  and  inexact),  then  overflow  or
31       underflow  shall be raised before inexact.  Whether the feraiseexcept()
32       function additionally raises the inexact floating-point exception when‐
33       ever  it  raises  the overflow or underflow floating-point exception is
34       implementation-defined.
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RETURN VALUE

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

42       No errors are defined.
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44       The following sections are informative.
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EXAMPLES

47       None.
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APPLICATION USAGE

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

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

63       None.
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SEE ALSO

66       feclearexcept(), fegetexceptflag(), fetestexcept()
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68       The Base Definitions volume of POSIX.1‐2017, <fenv.h>
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71       Portions  of  this text are reprinted and reproduced in electronic form
72       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
73       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
74       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
75       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
76       event of any discrepancy between this version and the original IEEE and
77       The  Open Group Standard, the original IEEE and The Open Group Standard
78       is the referee document. The original Standard can be  obtained  online
79       at http://www.opengroup.org/unix/online.html .
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81       Any  typographical  or  formatting  errors that appear in this page are
82       most likely to have been introduced during the conversion of the source
83       files  to  man page format. To report such errors, see https://www.ker‐
84       nel.org/doc/man-pages/reporting_bugs.html .
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88IEEE/The Open Group                  2017                    FERAISEEXCEPT(3P)
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