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)
