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.\" ========================================================================
.\"
.IX Title "REMCTL_COMMAND 3"
.TH REMCTL_COMMAND 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.
.if n .ad l
.nh
.SH "NAME"
remctl_command, remctl_commandv \- Send a command to a remctl server
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
#include <remctl.h>
.PP
int \fBremctl_command\fR(struct remctl *\fIr\fR, const char **\fIcommand\fR);
.PP
#include <sys/uio.h>
.PP
int \fBremctl_commandv\fR(struct remctl *\fIr\fR, const struct iovec *\fIiov\fR,
                    size_t \fIcount\fR);
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBremctl_command()\fR and \fBremctl_commandv()\fR send a command to a remote remctl
server.  The remctl client object \fIr\fR, created with \fBremctl_new()\fR, should
have previously been passed to \fBremctl_open()\fR to open a connection to the
server.
.PP
\&\fBremctl_command()\fR takes the command as a NULL-terminated array of
NUL-terminated strings (the same layout as an argv array).  This function
is most convenient when passing simple text commands.
.PP
\&\fBremctl_commandv()\fR takes the command as an array of iovec structs of length
\&\fIcount\fR.  This function is most convenient when passing arbitrary data to
the command, since the iovec struct takes a pointer and a length for each
chunk of data.  See \fBwritev\fR\|(2) for the layout of the iovec struct.
.PP
To control the network timeout for sending the command, see the
\&\fBremctl_set_timeout\fR\|(3) function.
.PP
After calling one of these functions, call \fBremctl_output()\fR to get the
results of the command.
.SH "RETURN VALUE"
.IX Header "RETURN VALUE"
\&\fBremctl_command()\fR and \fBremctl_commandv()\fR return true on success and false on
failure.  On failure, the caller should call \fBremctl_error()\fR to retrieve
the error message.
.SH "COMPATIBILITY"
.IX Header "COMPATIBILITY"
These interfaces have been provided by the remctl client library since its
initial release in version 2.0.
.SH "AUTHOR"
.IX Header "AUTHOR"
Russ Allbery <eagle@eyrie.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
Copyright 2007, 2009, 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_output\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/>.