fesetexceptflag(3M)fesetexceptflag(3M)NAMEfesetexceptflag() - set floating-point exception flags
HP Integrity Server Only
The function sets the status for the floating-point exception flags
indicated by the argument excepts to the states stored in the object
pointed to by flagp. The value of *flagp must have been set by a pre‐
vious call to whose second argument represented at least those float‐
ing-point exceptions represented by the argument excepts; otherwise,
the effect on the indicated floating-point exception flags is unde‐
fined. This function does not raise exceptions, but only sets the
state of the flags (hence no traps will be taken). The excepts argu‐
ment can be constructed as a bitwise OR of the floating-point exception
macros: and represents all the floating-point exceptions.
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 in order to prevent optimiza‐
tions that can undermine the specified behavior of this function.
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 all the specified flags
were successfully set to the appropriate state.
No errors are defined.
Use to save the current state of two floating-point exception flags.
Later, use to restore the saved state.
SEE ALSOfeclearexcept(3M), fegetexceptflag(3M), fegettrapenable(3M), feraiseex‐
cept(3M), fesettrapenable(3M), fetestexcept(3M), fenv(5).
: ISO/IEC C99 (including Annex F, "IEC 60559 floating-point arith‐