1 '\" te 2 .\" Copyright (c) 2001, the Institute of Electrical and Electronics Engineers, Inc. and The Open Group. All Rights Reserved. 3 .\" Portions Copyright (c) 2006, Sun Microsystems, Inc. All Rights Reserved. 4 .\" Sun Microsystems, Inc. gratefully acknowledges The Open Group for permission to reproduce portions of its copyrighted documentation. Original documentation from The Open Group can be obtained online at 5 .\" http://www.opengroup.org/bookstore/. 6 .\" The Institute of Electrical and Electronics Engineers and The Open Group, have given us permission to reprint portions of their documentation. In the following statement, the phrase "this text" refers to portions of the system documentation. Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html. 7 .\" This notice shall appear on any product containing this material. 8 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License. 9 .\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License. 10 .\" When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 11 .TH fegetenv 3M "12 Jul 2006" "SunOS 5.11" "Mathematical Library Functions" 12 .SH NAME 13 fegetenv, fesetenv \- get and set current floating-point environment 14 .SH SYNOPSIS 15 .LP 16 .nf 17 c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ] 18 #include <fenv.h> 19 20 \fBint\fR \fBfegetenv\fR(\fBfenv_t *\fR\fIenvp\fR); 21 .fi 22 23 .LP 24 .nf 25 \fBint\fR \fBfesetenv\fR(\fBconst fenv_t *\fR\fIenvp\fR); 26 .fi 27 28 .SH DESCRIPTION 29 .sp 30 .LP 31 The \fBfegetenv()\fR function attempts to store the current floating-point 32 environment in the object pointed to by \fIenvp\fR. 33 .sp 34 .LP 35 The \fBfesetenv()\fR function attempts to establish the floating-point 36 environment represented by the object pointed to by \fIenvp\fR. The \fIenvp\fR 37 argument points to an object set by a call to \fBfegetenv()\fR or 38 \fBfeholdexcept\fR(3M), or equals a floating-point environment macro. The 39 \fBfesetenv()\fR function does not raise floating-point exceptions, but only 40 installs the state of the floating-point status flags represented through its 41 argument. 42 .SH RETURN VALUES 43 .sp 44 .LP 45 If the representation was successfully stored, fegetenv returns 0. Otherwise, 46 it returns a non-zero value. 47 .sp 48 .LP 49 If the environment was successfully established, fesetenv returns 0. Otherwise, 50 it returns a non-zero value. 51 .SH ERRORS 52 .sp 53 .LP 54 No errors are defined. 55 .SH ATTRIBUTES 56 .sp 57 .LP 58 See \fBattributes\fR(5) for descriptions of the following attributes: 59 .sp 60 61 .sp 62 .TS 63 tab() box; 64 cw(2.75i) |cw(2.75i) 65 lw(2.75i) |lw(2.75i) 66 . 67 ATTRIBUTE TYPEATTRIBUTE VALUE 68 _ 69 Interface StabilityStandard 70 _ 71 MT-LevelMT-Safe 72 .TE 73 74 .SH SEE ALSO 75 .sp 76 .LP 77 \fBfeholdexcept\fR(3M), \fBfenv.h\fR(3HEAD), \fBfeupdateenv\fR(3M), 78 \fBattributes\fR(5), \fBstandards\fR(5) 79 .SH NOTES 80 .sp 81 .LP 82 In a multithreaded program, the \fBfegetenv()\fR and \fBfegetenv()\fR functions 83 affect the floating point environment only for the calling thread. 84 .sp 85 .LP 86 These functions automatically install and deinstall \fBSIGFPE\fR handlers and 87 set and clear the trap enable mode bits in the floating point status register 88 as needed. If a program uses these functions and attempts to install a 89 \fBSIGFPE\fR handler or control the trap enable mode bits independently, the 90 resulting behavior is not defined. 91 .sp 92 .LP 93 As described in \fBfex_set_handling\fR(3M)\fB\fR, when a handling function 94 installed in \fBFEX_CUSTOM\fR mode is invoked, all exception traps are disabled 95 (and will not be reenabled while \fBSIGFPE\fR is blocked). Thus, attempting to 96 change the environment from within a handler by calling \fBfesetenv\fR or 97 \fBfeupdateenv\fR(3M) might not produce the expected results.