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(7) for descriptions of the following attributes:


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

SEE ALSO

fenv.h(3HEAD), fegetenv(3M), feupdateenv(3M), attributes(7),
standards(7)

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 July 12, 2006 FEHOLDEXCEPT(3M)