fesetenv(3M)fesetenv(3M)NAMEfesetenv() - set floating-point environment
HP Integrity Server Only
The function establishes the floating-point environment represented by
the object pointed to by envp. The argument envp must point to an
object set by a call to or or equal the macro
Note that merely installs the state of the floating-point exception
flags represented through its argument, and does not raise these float‐
ing-point exceptions (hence no traps will be taken).
To use this function, compile either with the default option or with
the and options. Make sure your program includes
For Integrity servers, specify on the compiler command line or place
the call to this function under the effect of an affirmative pragma:
If the pragma is placed outside of any top-level declarations in a
file, the pragma will apply to all declarations in the compilation fol‐
lowing the pragma until another pragma is encountered or until the end
of the file is reached.
If the pragma is placed at the beginning of a block (compound state‐
ment), the pragma will apply until another pragma is encountered or
until the end of the block is reached.
For PA-RISC, you might need to use the compiler option in order to pre‐
vent optimizations that can undermine the specified behavior of this
Link in the math library by specifying on the compiler or linker com‐
For more information, see the at the following site:
Integrity Server Only
This function always returns 0, indicating that the environment was
No errors are defined.
Store the current floating-point environment, continue on exceptions,
and then restore the previous environment without raising the accumu‐
lated floating-point exceptions.
Restore the default environment:
SEE ALSOfegetenv(3M), feholdexcept(3M), feupdateenv(3M), fenv(5).
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arith‐