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authorUlrich Drepper <drepper@redhat.com>1999-11-12 17:23:30 +0000
committerUlrich Drepper <drepper@redhat.com>1999-11-12 17:23:30 +0000
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Update.
1999-11-02 Andreas Jaeger <aj@suse.de> * Versions.def: Add version GLIBC_2.2 for libm. * math/fenv.h: Add prototypes for fegetexcept, feenableexcept and fedisableexcept. * sysdeps/generic/feenablxcpt.c: Stub file. * sysdeps/generic/fedisblxcpt.c: Stub file. * sysdeps/generic/fegetexcept.c: Stub file. * sysdeps/i386/fpu/fedisblxcpt.c: New file. * sysdeps/i386/fpu/feenablxcpt.c: New file. * sysdeps/i386/fpu/fegetexcept.c: New file. * math/Makefile (libm-support): Add new files. * math/Versions: Add new functions with version GLIBC_2.2. * manual/arith.texi (Control Functions): Document fegetexcept, feenableexcept and fedisableexcept.
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diff --git a/manual/arith.texi b/manual/arith.texi
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--- a/manual/arith.texi
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@@ -828,6 +828,42 @@ The function returns zero in case the operation was successful, a
non-zero value otherwise.
@end deftypefun
+@noindent
+To control for individual exceptions if raising them causes a trap to
+occur, you can use the following two functions.
+
+@strong{Portability Note:} These functions are all GNU extensions.
+
+@comment fenv.h
+@comment GNU
+@deftypefun int feenableexcept (int @var{excepts})
+This functions enables traps for each of the exceptions as indicated by
+the parameter @var{except}. The individual excepetions are described in
+@ref{Examining the FPU status word}. Only the specified exceptions are
+enabled, the status of the other exceptions is not changed.
+
+The function returns the previous enabled exceptions in case the
+operation was successful, @code{-1} otherwise.
+@end deftypefun
+
+@comment fenv.h
+@comment GNU
+@deftypefun int fedisableexcept (int @var{excepts})
+This functions disables traps for each of the exceptions as indicated by
+the parameter @var{except}. The individual excepetions are described in
+@ref{Examining the FPU status word}. Only the specified exceptions are
+disabled, the status of the other exceptions is not changed.
+
+The function returns the previous enabled exceptions in case the
+operation was successful, @code{-1} otherwise.
+@end deftypefun
+
+@comment fenv.h
+@comment GNU
+@deftypefun int fegetexcept (int @var{excepts})
+The function returns a bitmask of all currently enabled exceptions. It
+returns @code{-1} in case of failure.
+
@node Arithmetic Functions
@section Arithmetic Functions