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feholdexcept(3m) [opensolaris man page]

feholdexcept(3M)					  Mathematical Library Functions					  feholdexcept(3M)

NAME
feholdexcept - save current floating-point environment SYNOPSIS
c99 [ flag... ] file... -lm [ library... ] #include <fenv.h> int feholdexcept(fenv_t *envp); DESCRIPTION
The feholdexcept() function saves the current floating-point environment in the object pointed to by envp, clears the floating-point status flags, and then installs a non-stop (continue on floating-point exceptions) mode, if available, for all floating-point exceptions. RETURN VALUES
The feholdexcept() function returns 0 if and only if non-stop floating-point exception handling was successfully installed. 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
fegetenv(3M), fenv.h(3HEAD), feupdateenv(3M), attributes(5), standards(5) NOTES
In a multithreaded program, the feholdexcept() function affects the floating point environment only for the calling thread. The feholdexcept() 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 5.11 12 Jul 2006 feholdexcept(3M)

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

NAME
fegetenv, fesetenv - get and set current floating-point environment SYNOPSIS
cc [ 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 5.10 1 Nov 2003 fegetenv(3M)
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