1FEHOLDEXCEPT(3P)           POSIX Programmer's Manual          FEHOLDEXCEPT(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       feholdexcept — save current floating-point environment
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SYNOPSIS

16       #include <fenv.h>
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18       int feholdexcept(fenv_t *envp);
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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 feholdexcept() function shall save the current floating-point envi‐
27       ronment in the object pointed to by envp, clear the floating-point sta‐
28       tus  flags,  and  then  install  a non-stop (continue on floating-point
29       exceptions) mode, if available, for all floating-point exceptions.
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RETURN VALUE

32       The feholdexcept() function shall return zero if and only  if  non-stop
33       floating-point exception handling was successfully installed.
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ERRORS

36       No errors are defined.
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38       The following sections are informative.
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EXAMPLES

41       None.
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APPLICATION USAGE

44       None.
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RATIONALE

47       The   feholdexcept()   function   should   be   effective   on  typical
48       IEC 60559:1989 standard implementations which have the default non-stop
49       mode  and at least one other mode for trap handling or aborting. If the
50       implementation provides only the non-stop  mode,  then  installing  the
51       non-stop mode is trivial.
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FUTURE DIRECTIONS

54       None.
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SEE ALSO

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