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HP-UX Reference Volume 4 of 5 > ffeholdexcept(3M) |
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NAMEfeholdexcept() — save floating-point environment DESCRIPTIONThe feholdexcept() function saves the current floating-point environment in the object pointed to by the argument envp, clears the exception flags, and disables all traps. Use feholdexcept() with feupdateenv() to hide spurious exceptions. Use it with fesetenv() to hide all exceptions. The ISO/ANSI C committee has approved the feholdexcept() function for inclusion in the C9X draft standard. 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>. 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. RETURN VALUEThe feholdexcept() function returns a nonzero value, indicating the successful disabling of any traps. EXAMPLEStore the current floating-point environment in holdenv, hide spurious underflow exceptions, and continue on any exceptions that occur until the call to feupdateenv() is encountered. #include <fenv.h> /*...*/ fenv_t holdenv; feholdexcept(&holdenv); /* perform operations */ if (/* test for spurious underflow */) feclearexcept(FE_UNDERFLOW); feupdateenv(&holdenv); /* raise accumulated exceptions */ |
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