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HP-UX Reference > F
fesetenv(3M)HP-UX 11i Version 3: February 2007 |
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NAMEfesetenv() — set floating-point environment DESCRIPTIONThe fesetenv() 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 fegetenv() or feholdexcept(), or equal the macro FE_DFL_ENV. Note that fesetenv() merely installs the state of the floating-point exception flags represented through its argument, and does not raise these floating-point exceptions (hence no traps will be taken). USAGETo 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. RETURN VALUEEXAMPLESStore the current floating-point environment, continue on exceptions, and then restore the previous environment without raising the accumulated floating-point exceptions. #include <fenv.h> /*...*/ fenv_t holdenv; feholdexcept(&holdenv); /* perform operations */ fesetenv(&holdenv); Restore the default environment: #include <fenv.h> /*...*/ fesetenv(FE_DFL_ENV); |
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