Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/upstream/archlinux/man3p/feupdateenv.3p b/upstream/archlinux/man3p/feupdateenv.3p
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+'\" et
+.TH FEUPDATEENV "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+feupdateenv
+\(em update floating-point environment
+.SH SYNOPSIS
+.LP
+.nf
+#include <fenv.h>
+.P
+int feupdateenv(const fenv_t *\fIenvp\fP);
+.fi
+.SH DESCRIPTION
+The functionality described on this reference page is aligned with the
+ISO\ C standard. Any conflict between the requirements described here and the
+ISO\ C standard is unintentional. This volume of POSIX.1\(hy2017 defers to the ISO\ C standard.
+.P
+The
+\fIfeupdateenv\fR()
+function shall attempt to save the currently raised floating-point
+exceptions in its automatic storage, attempt to install the
+floating-point environment represented by the object pointed to by
+.IR envp ,
+and then attempt to raise the saved floating-point exceptions. The
+argument
+.IR envp
+shall point to an object set by a call to
+\fIfeholdexcept\fR()
+or
+\fIfegetenv\fR(),
+or equal a floating-point environment macro.
+.SH "RETURN VALUE"
+The
+\fIfeupdateenv\fR()
+function shall return a zero value if and only if all the required
+actions were successfully carried out.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+The following example shows sample code to hide spurious underflow
+floating-point exceptions:
+.sp
+.RS 4
+.nf
+
+#include <fenv.h>
+double f(double x)
+{
+    #pragma STDC FENV_ACCESS ON
+    double result;
+    fenv_t save_env;
+    feholdexcept(&save_env);
+    // compute result
+    if (/* test spurious underflow */)
+    feclearexcept(FE_UNDERFLOW);
+    feupdateenv(&save_env);
+    return result;
+}
+.fi
+.P
+.RE
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIfegetenv\fR\^(\|)",
+.IR "\fIfeholdexcept\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<fenv.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 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 .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .