mirror of https://github.com/mkerrisk/man-pages
78 lines
2.2 KiB
Plaintext
78 lines
2.2 KiB
Plaintext
.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
|
|
.TH "FETESTEXCEPT" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
|
|
.\" fetestexcept
|
|
.SH NAME
|
|
fetestexcept \- test floating-point exception flags
|
|
.SH SYNOPSIS
|
|
.LP
|
|
\fB#include <fenv.h>
|
|
.br
|
|
.sp
|
|
int fetestexcept(int\fP \fIexcepts\fP\fB);
|
|
.br
|
|
\fP
|
|
.SH DESCRIPTION
|
|
.LP
|
|
The \fIfetestexcept\fP() function shall determine which of a specified
|
|
subset of the floating-point exception flags are
|
|
currently set. The \fIexcepts\fP argument specifies the floating-point
|
|
status flags to be queried.
|
|
.SH RETURN VALUE
|
|
.LP
|
|
The \fIfetestexcept\fP() function shall return the value of the bitwise-inclusive
|
|
OR of the floating-point exception macros
|
|
corresponding to the currently set floating-point exceptions included
|
|
in \fIexcepts\fP.
|
|
.SH ERRORS
|
|
.LP
|
|
No errors are defined.
|
|
.LP
|
|
\fIThe following sections are informative.\fP
|
|
.SH EXAMPLES
|
|
.LP
|
|
The following example calls function \fIf\fP() if an invalid exception
|
|
is set, and then function \fIg\fP() if an overflow
|
|
exception is set:
|
|
.sp
|
|
.RS
|
|
.nf
|
|
|
|
\fB#include <fenv.h>
|
|
/* ... */
|
|
{
|
|
#pragma STDC FENV_ACCESS ON
|
|
int set_excepts;
|
|
feclearexcept(FE_INVALID | FE_OVERFLOW);
|
|
// maybe raise exceptions
|
|
set_excepts = fetestexcept(FE_INVALID | FE_OVERFLOW);
|
|
if (set_excepts & FE_INVALID) f();
|
|
if (set_excepts & FE_OVERFLOW) g();
|
|
/* ... */
|
|
}
|
|
\fP
|
|
.fi
|
|
.RE
|
|
.SH APPLICATION USAGE
|
|
.LP
|
|
None.
|
|
.SH RATIONALE
|
|
.LP
|
|
None.
|
|
.SH FUTURE DIRECTIONS
|
|
.LP
|
|
None.
|
|
.SH SEE ALSO
|
|
.LP
|
|
\fIfeclearexcept\fP() , \fIfegetexceptflag\fP() , \fIferaiseexcept\fP()
|
|
, the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<fenv.h>\fP
|
|
.SH COPYRIGHT
|
|
Portions of this text are reprinted and reproduced in electronic form
|
|
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
|
|
-- Portable Operating System Interface (POSIX), The Open Group Base
|
|
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
|
|
Electrical and Electronics Engineers, Inc and The Open Group. In the
|
|
event of any discrepancy between this version 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 .
|