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'\" et
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.TH FEHOLDEXCEPT "3P" 2013 "IEEE/The Open Group" "POSIX Programmer's Manual"
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.SH PROLOG
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This manual page is part of the POSIX Programmer's Manual.
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The Linux implementation of this interface may differ (consult
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the corresponding Linux manual page for details of Linux behavior),
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or the interface may not be implemented on Linux.
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.SH NAME
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feholdexcept
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\(em save current floating-point environment
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.SH SYNOPSIS
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.LP
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.nf
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#include <fenv.h>
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.P
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int feholdexcept(fenv_t *\fIenvp\fP);
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.fi
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.SH DESCRIPTION
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The functionality described on this reference page is aligned with the
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ISO\ C standard. Any conflict between the requirements described here and the
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ISO\ C standard is unintentional. This volume of POSIX.1\(hy2008 defers to the ISO\ C standard.
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.P
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The
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\fIfeholdexcept\fR()
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function shall save the current floating-point environment in the
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object pointed to by
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.IR envp ,
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clear the floating-point status flags, and then install a non-stop
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(continue on floating-point exceptions) mode, if available, for all
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floating-point exceptions.
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.SH "RETURN VALUE"
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The
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\fIfeholdexcept\fR()
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function shall return zero if and only if non-stop floating-point
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exception handling was successfully installed.
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.SH ERRORS
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No errors are defined.
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.LP
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.IR "The following sections are informative."
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.SH EXAMPLES
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None.
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.SH "APPLICATION USAGE"
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None.
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.SH RATIONALE
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The
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\fIfeholdexcept\fR()
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function should be effective on typical IEC\ 60559:\|1989 standard implementations which
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have the default non-stop mode and at least one other mode for trap
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handling or aborting. If the implementation provides only the non-stop
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mode, then installing the non-stop mode is trivial.
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.SH "FUTURE DIRECTIONS"
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None.
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.SH "SEE ALSO"
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.IR "\fIfegetenv\fR\^(\|)",
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.IR "\fIfeupdateenv\fR\^(\|)"
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.P
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The Base Definitions volume of POSIX.1\(hy2008,
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.IR "\fB<fenv.h>\fP"
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.SH COPYRIGHT
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Portions of this text are reprinted and reproduced in electronic form
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from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
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-- Portable Operating System Interface (POSIX), The Open Group Base
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Specifications Issue 7, Copyright (C) 2013 by the Institute of
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Electrical and Electronics Engineers, Inc and The Open Group.
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(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
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event of any discrepancy between this version and the original IEEE and
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The Open Group Standard, the original IEEE and The Open Group Standard
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is the referee document. The original Standard can be obtained online at
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http://www.unix.org/online.html .
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Any typographical or formatting errors that appear
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in this page are most likely
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to have been introduced during the conversion of the source files to
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man page format. To report such errors, see
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https://www.kernel.org/doc/man-pages/reporting_bugs.html .
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