fegetenv()

QNX SDP8.0C Library ReferenceAPIDeveloper

Get the current floating-point environment

Synopsis:

#include <fenv.h>

int fegetenv( fenv_t *envp );

Arguments:

envp
A pointer to a fenv_t object where the function can store the environment.

Library:

libm
The general-purpose math library.
libm-sve
A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

  • If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
  • If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.
Note:
Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

The fegetenv() function gets the current floating-point environment and stores it in the object that envp points to.

Returns:

0

Classification:

C99, POSIX 1003.1

Safety:
Cancellation pointNo
Signal handlerYes
ThreadYes
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