fegetenv - Linux
Overview
fegetenv is a utility for printing and manipulating the floating-point environment of the calling process. It allows users to retrieve and set the current floating-point rounding mode, exception handling behavior, and other settings that affect the behavior of floating-point operations. This command is particularly useful for debugging and testing numerical applications or optimizing performance.
Syntax
fegetenv [-s]
Options/Flags
-s: Instead of printing the floating-point environment, store it in the global variable __fenv_save__
.
Examples
Get the current floating-point environment:
$ fegetenv
Store the current floating-point environment in a variable:
$ fegetenv -s
Set the floating-point rounding mode to nearest:
$ fegetenv -s
setfe(FE_ROUND, FE_TONEAREST)
fegetenv
Common Issues
- Ensure that the
__fenv_save__
variable is initialized before storing the floating-point environment using the-s
flag.
Integration
- fegetenv can be used in conjunction with the
fesetenv
command to change the floating-point environment of the calling process. - It can also be integrated into scripts or C programs to control the floating-point environment for specific operations or debugging purposes.
Related Commands
- fesetenv: Sets the floating-point environment of the calling process.
- feupdateenv: Updates the floating-point environment based on the exception flags.
- fenv.h: C header file defining the floating-point environment and related functions.