1FEGETENV(3P)               POSIX Programmer's Manual              FEGETENV(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       fegetenv, fesetenv — get and set current floating-point environment
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SYNOPSIS

15       #include <fenv.h>
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17       int fegetenv(fenv_t *envp);
18       int fesetenv(const 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.1‐2017
24       defers to the ISO C standard.
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26       The  fegetenv()  function  shall attempt to store the current floating-
27       point environment in the object pointed to by envp.
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29       The fesetenv() function shall attempt to establish  the  floating-point
30       environment represented by the object pointed to by envp.  The argument
31       envp shall point to an object set by a call to fegetenv() or  feholdex‐
32       cept(),  or  equal  a  floating-point environment macro. The fesetenv()
33       function does not raise floating-point exceptions,  but  only  installs
34       the  state  of  the floating-point status flags represented through its
35       argument.
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RETURN VALUE

38       If the representation was successfully stored, fegetenv() shall  return
39       zero.  Otherwise, it shall return a non-zero value.  If the environment
40       was successfully established, fesetenv() shall return zero.  Otherwise,
41       it shall return a non-zero value.
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ERRORS

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

49       None.
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APPLICATION USAGE

52       None.
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RATIONALE

55       None.
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FUTURE DIRECTIONS

58       None.
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SEE ALSO

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