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

12       feholdexcept — save current floating-point environment
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SYNOPSIS

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

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

35       No errors are defined.
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37       The following sections are informative.
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EXAMPLES

40       None.
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APPLICATION USAGE

43       None.
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RATIONALE

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

53       None.
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SEE ALSO

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