fex_merge_flags(3m) [sunos man page]

fex_merge_flags(3M)					  Mathematical Library Functions				       fex_merge_flags(3M)

NAME

       fex_merge_flags - manage the floating point environment

SYNOPSIS

       cc [ flag... ] file... -lm [ library... ]
       #include <fenv.h>

       void fex_merge_flags(const fenv_t *envp);

DESCRIPTION

       The fex_merge_flags() function copies into the current environment those exception flags that are set in the environment represented by the
       object pointed to by envp.  The argument envp must point to an object set by a call to feholdexcept(3M) or fegetenv(3M)	or  equal  to  the
       macro FE_DFL_ENV.  The fex_merge_flags() function does not raise any exceptions, but only sets its flags.

RETURN VALUES

       The fex_merge_flags function does not return a value.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Availability		     |SUNWlibms, SUNWlmsx	   |
       |Interface Stability	     |Stable			   |
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       feclearexcept(3M), fegetenv(3M), fesetround(3M), fesetprec(3M), fex_set_handling(3M), fex_set_log(3M), attributes(5)

       Numerical Computation Guide

NOTES

       In a multithreaded program, the fex_merge_flags() function affects the floating point environment only for the calling thread.

       The  fex_merge_flags()  function automatically installs and deinstalls SIGFPE handlers and sets and clears the trap enable mode bits in the
       floating point status register as needed.  If a program uses these functions and attempts to install a SIGFPE handler or control  the  trap
       enable mode bits independently, the resulting behavior is not defined.

SunOS 5.10							    1 Nov 2003						       fex_merge_flags(3M)

fegetenv(3M)						  Mathematical Library Functions					      fegetenv(3M)

NAME

       fegetenv, fesetenv - get and set current floating-point environment

SYNOPSIS

       c99 [ flag... ] file... -lm [ library... ]
       #include <fenv.h>

       int fegetenv(fenv_t *envp);

       int fesetenv(const fenv_t *envp);

DESCRIPTION

       The fegetenv() function attempts to store the current floating-point environment in the object pointed to by envp.

       The  fesetenv()	function attempts to establish the floating-point environment represented by the object pointed to by envp. The envp argu-
       ment points to an object set by a call to fegetenv() or feholdexcept(3M), or equals a  floating-point  environment  macro.  The	fesetenv()
       function  does  not raise floating-point exceptions, but only installs the state of the floating-point status flags represented through its
       argument.

RETURN VALUES

       If the representation was successfully stored, fegetenv returns 0. Otherwise, it returns a non-zero value.

       If the environment was successfully established, fesetenv returns 0. Otherwise, it returns a non-zero value.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       feholdexcept(3M), fenv.h(3HEAD), feupdateenv(3M), attributes(5), standards(5)

NOTES

       In a multithreaded program, the fegetenv() and fegetenv() functions affect the floating point environment only for the calling thread.

       These functions automatically install and deinstall SIGFPE handlers and set and clear the trap enable mode bits in the floating point  sta-
       tus  register  as  needed.  If a program uses these functions and attempts to install a SIGFPE handler or control the trap enable mode bits
       independently, the resulting behavior is not defined.

       As described in fex_set_handling(3M), when a handling function installed in FEX_CUSTOM mode is invoked, all exception  traps  are  disabled
       (and  will  not be reenabled while SIGFPE is blocked). Thus, attempting to change the environment from within a handler by calling fesetenv
       or feupdateenv(3M) might not produce the expected results.

SunOS 5.11							    12 Jul 2006 						      fegetenv(3M)