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author | 2011-05-25 21:28:43 +0000 | |
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committer | 2011-05-25 21:28:43 +0000 | |
commit | 939fdbfbefbedcc482706073c233c6a468ca2169 (patch) | |
tree | 3bd709d8b20f1a72bf52e3d4309828ff2a949f17 /lib/libm/man/feenableexcept.3 | |
parent | On PowerPC we cannot manipulate FPSCR[VX]--it's a summary of all (diff) | |
download | wireguard-openbsd-939fdbfbefbedcc482706073c233c6a468ca2169.tar.xz wireguard-openbsd-939fdbfbefbedcc482706073c233c6a468ca2169.zip |
Document C99 floating-point environment.
Diffstat (limited to 'lib/libm/man/feenableexcept.3')
-rw-r--r-- | lib/libm/man/feenableexcept.3 | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/libm/man/feenableexcept.3 b/lib/libm/man/feenableexcept.3 new file mode 100644 index 00000000000..d550c6575eb --- /dev/null +++ b/lib/libm/man/feenableexcept.3 @@ -0,0 +1,87 @@ +.\" $OpenBSD: feenableexcept.3,v 1.1 2011/05/25 21:28:43 martynas Exp $ +.\" +.\" Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org> +.\" +.\" Permission to use, copy, modify, and distribute this software for any +.\" purpose with or without fee is hereby granted, provided that the above +.\" copyright notice and this permission notice appear in all copies. +.\" +.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. +.\" +.Dd $Mdocdate: May 25 2011 $ +.Dt FEENABLEEXCEPT 3 +.Os +.Sh NAME +.Nm feenableexcept , +.Nm fedisableexcept , +.Nm fegetexcept +.Nd control floating-point exception masks +.Sh SYNOPSIS +.Fd #include <fenv.h> +.Ft int +.Fn feenableexcept "int excepts" +.Ft int +.Fn fedisableexcept "int excepts" +.Ft int +.Fn fegetexcept void +.Sh DESCRIPTION +These functions provide control of the floating-point exception +masks. +The +.Fa excepts +input argument is a bitmask specifying an exception type and +containing any of the values listed in +.Xr feclearexcept 3 . +.El +.Pp +The +.Fn feenableexcept +function unmasks the floating-point exceptions represented by +.Fa excepts . +The future floating-point operations that produce +.Fa excepts +will trap, and a +.Dv SIGFPE +will be delivered to the process. +.Pp +The +.Fn fedisableexcept +function masks the floating-point exceptions represented by +.Fa excepts . +All exceptions are masked by default. +.Pp +The +.Fn fegetexcept +function returns the current exception mask. +.Sh RETURN VALUES +The +.Fn feenableexcept , +and +.Fn fedisableexcept +functions return the previous exception mask. +The +.Fn fegetexcept +function returns the current exception mask. +.Sh SEE ALSO +.Xr sigaction 2 , +.Xr feclearexcept 3 , +.Xr fegetround 3 , +.Xr fegetenv 3 +.Sh STANDARDS +The +.Fn feenableexcept , +.Fn fedisableexcept , +and +.Fn fegetexcept +functions are +.Ox +extensions. +.Sh HISTORY +These functions first appeared in +.Ox 5.0 . |