FEGETENV(3P)

🦋 PROLOG 🦋

okay bestie, quick heads up before we get into it 💖 this page is part of the POSIX Programmer's Manual. that's the manual name, that's the vibe, we move.

ngl the Linux implementation of this interface may differ (so go check the corresponding Linux manual page for the deets on Linux behavior), or the interface might not be implemented on Linux at all. so like… vibe check your platform first 🙈

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✨ NAME ✨

fegetenv, fesetenv — get and set current floating-point environment

like, literally grab the float env and put it back. that's the whole gig 💅

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🌸 SYNOPSIS 🌸

#include <fenv.h>

int fegetenv(fenv_t *envp);
int fesetenv(const fenv_t *envp);

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💖 DESCRIPTION 💖

so the functionality described on this reference page is aligned with the ISO C standard. if there's any conflict between the requirements described here and the ISO C standard, that's unintentional, ok? not a plot twist we wanted. this volume of POSIX.1‐2017 defers to the ISO C standard, periodt.

now, the tea ☕:

• The fegetenv() function shall attempt to store the current floating-point environment in the object pointed to by envp. 📥
• The fesetenv() function shall attempt to establish the floating-point environment represented by the object pointed to by envp. The argument envp shall point to an object set by a call to fegetenv() or feholdexcept(), or equal a floating-point environment macro. 🎀

and here's the part that's giving very specific, bestie: fesetenv() does not raise floating-point exceptions. it only installs the state of the floating-point status flags represented through its argument. no drama, no exceptions, just installation. slay 🔥

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⭐ RETURN VALUE ⭐

• If the representation was successfully stored, fegetenv() shall return zero. Otherwise, it shall return a non-zero value.
• If the environment was successfully established, fesetenv() shall return zero. Otherwise, it shall return a non-zero value.

zero = we ate. non-zero = uh oh 💀

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🌈 ERRORS 🌈

No errors are defined.

and lowkey, the following sections are informative. iykyk 👑

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🎀 EXAMPLES 🎀

None.

(it's giving minimal, honestly)

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🫶 APPLICATION USAGE 🫶

None.

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🧚 RATIONALE 🧚

None.

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💜 FUTURE DIRECTIONS 💜

None.

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👑 SEE ALSO 👑

• feholdexcept()
• feupdateenv()

The Base Definitions volume of POSIX.1‐2017, <fenv.h>

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💅 COPYRIGHT 💅

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

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fr fr that's the whole page. no cap, that's it 🍓

and that's a wrap bestie!! this lil masterpiece was brought to you by IEEE/The Open Group, 2017 💖✨ go forth and set your floating-point environments responsibly 🦋👑