Linux 2.6 - man page for fegetround (linux section 3posix)
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FEGETROUND(P) POSIX Programmer's Manual FEGETROUND(P)
fegetround, fesetround - get and set current rounding direction
int fesetround(int round);
The fegetround() function shall get the current rounding direction.
The fesetround() function shall establish the rounding direction represented by its argu-
ment round. If the argument is not equal to the value of a rounding direction macro, the
rounding direction is not changed.
The fegetround() function shall return the value of the rounding direction macro repre-
senting the current rounding direction or a negative value if there is no such rounding
direction macro or the current rounding direction is not determinable.
The fesetround() function shall return a zero value if and only if the requested rounding
direction was established.
No errors are defined.
The following sections are informative.
The following example saves, sets, and restores the rounding direction, reporting an error
and aborting if setting the rounding direction fails:
void f(int round_dir)
#pragma STDC FENV_ACCESS ON
save_round = fegetround();
setround_ok = fesetround(round_dir);
assert(setround_ok == 0);
/* ... */
/* ... */
The Base Definitions volume of IEEE Std 1003.1-2001, <fenv.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 FEGETROUND(P)
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