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.\"
.IX Title "REMCTL_NOOP 3"
.TH REMCTL_NOOP 3 "2022-05-09" "3.18" "remctl Library Reference"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
remctl_noop \- Send a NOOP message to a remctl server
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
#include <remctl.h>
.PP
int \fBremctl_noop\fR(struct remctl *\fIr\fR);
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBremctl_noop()\fR sends a \s-1NOOP\s0 message to a remctl server and reads the
expected \s-1NOOP\s0 response.  This is primarily used to keep a connection to a
remctl server alive, such as through a firewall with a session timeout,
while waiting to issue further commands.
.PP
The \s-1NOOP\s0 message requires protocol version 3 support in the server, so the
caller should be prepared for this function to fail, indicating that the
connection could not be kept alive and possibly that it was closed by the
server.  In this case, the client will need to explicitly reopen the
connection with \fBremctl_open()\fR.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
\&\fBremctl_noop()\fR returns true on success and false on failure.  On failure,
the caller should call \fBremctl_error()\fR to retrieve the error message.  In
addition to network errors, this function may fail if the server doesn't
support protocol version 3.
.SH "COMPATIBILITY"
.IX Header "COMPATIBILITY"
This interface was added in version 3.0.
.SH "AUTHOR"
.IX Header "AUTHOR"
Russ Allbery <eagle@eyrie.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2011, 2014 The Board of Trustees of the Leland Stanford Junior
University
.PP
Copying and distribution of this file, with or without modification, are
permitted in any medium without royalty provided the copyright notice and
this notice are preserved.  This file is offered as-is, without any
warranty.
.PP
SPDX-License-Identifier: \s-1FSFAP\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBremctl_new\fR\|(3), \fBremctl_open\fR\|(3), \fBremctl_command\fR\|(3), \fBremctl_error\fR\|(3)
.PP
The current version of the remctl library and complete details of the
remctl protocol are available from its web page at
<https://www.eyrie.org/~eagle/software/remctl/>.