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.TH FETESTEXCEPT 3M "Jul 12, 2006" "SunOS 5.11" "Mathematical Library Functions"
.SH NAME
fetestexcept \- test floating-point exception flags
.SH SYNOPSIS
.LP
.nf
c99 [ \fIflag\fR... ] \fIfile\fR... \fB-lm\fR [ \fIlibrary\fR... ]
#include <fenv.h>

\fBint\fR \fBfetestexcept\fR(\fBint\fR \fIexcepts\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBfetestexcept()\fR function determines which of a specified subset of the
floating-point exception flags are currently set. The \fIexcepts\fR argument
specifies the floating-point status flags to be queried.
.SH RETURN VALUES
.sp
.LP
The \fBfetestexcept()\fR function returns the value of the bitwise-inclusive OR
of the floating-point exception macros corresponding to the currently set
floating-point exceptions included in \fIexcepts\fR.
.SH ERRORS
.sp
.LP
No errors are defined.
.SH EXAMPLES
.LP
\fBExample 1 \fRExample using \fBfetestexcept()\fR
.sp
.LP
The following example calls function \fIf\fR( ) if an invalid exception is set,
and then function \fIg\fR( ) if an overflow exception is set:

.sp
.in +2
.nf
#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();
      /* ... */
}
.fi
.in -2

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
tab(	) box;
cw(2.75i) |cw(2.75i)
lw(2.75i) |lw(2.75i)
.
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR fenv.h (3HEAD),
.BR feclearexcept (3M),
.BR fegetexceptflag (3M),
.BR attributes (7),
.BR standards (7)