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fegetexceptflag(3M)HP-UX 11i Version 3: February 2007
fegetexceptflag() — get floating-point exception flags
The fegetexceptflag() function stores a representation of the states of the floating-point exception flags indicated by the argument excepts in the object pointed to by the argument flagp. The excepts argument can be constructed as a bitwise OR of the floating-point exception macros: FE_INEXACT, FE_DIVBYZERO, FE_UNDERFLOW, FE_OVERFLOW, and FE_INVALID. FE_ALL_EXCEPT represents all the floating-point exceptions. The object into which the floating-point exception flags are stored can be passed to fesetexceptflag to restore the system exception flags, but the representation of the floating-point exception flags stored in the object is otherwise unspecified.
Use fetestexcept(), instead of fegetexceptflag(), to determine which floating-point exception flags are set.
To use this function, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. Make sure your program includes <fenv.h>.
For Integrity servers, specify +Ofenvaccess on the compiler command line or place the call to this function under the effect of an affirmative FENV_ACCESS pragma:
#pragma STDC FENV_ACCESS ON
If the FENV_ACCESS pragma is placed outside of any top-level declarations in a file, the pragma will apply to all declarations in the compilation following the pragma until another FENV_ACCESS pragma is encountered or until the end of the file is reached.
If the FENV_ACCESS pragma is placed at the beginning of a block (compound statement), the pragma will apply until another FENV_ACCESS pragma is encountered or until the end of the block is reached.
For PA-RISC, you might need to use the +Onomoveflops compiler option in order to prevent optimizations that can undermine the specified behavior of this function.
Link in the math library by specifying -lm on the compiler or linker command line.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp.
Integrity Server Only
This function always returns 0, indicating that a representation was successfully stored.
Store the overflow and invalid floating-point exception flags:
#include <fenv.h> /*...*/ fexcept_t flags; /*...*/ fegetexceptflag(&flags, FE_OVERFLOW | FE_INVALID);
feclearexcept(3M), fegettrapenable(3M), feraiseexcept(3M), fesetexceptflag(3M), fesettrapenable(3M), fetestexcept(3M), fenv(5).