feholdexcept(3M)feholdexcept(3M)NAMEfeholdexcept() - save floating-point environment
The function saves the current floating-point environment in the object
pointed to by the argument envp. This function also clears the float‐
ing-point exception flags and disables all traps.
Use with to hide spurious floating-point exceptions. Use it with to
hide all floating-point exceptions.
To use this function, compile either with the default option or with
the and options. Make sure your program includes
For HP 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:
The function returns a zero value, indicating the successful disabling
of any traps.
No errors are defined.
Store the current floating-point environment in hide spurious underflow
exceptions, and continue on any floating-point exceptions that occur
until the call to is encountered.
SEE ALSOfegetenv(3M), fesetenv(3M), feupdateenv(3M), fenv(5).
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arith‐