remctl_command, remctl_commandv

(Send a command to a remctl server)


#include <remctl.h>

int remctl_command(struct remctl *r, const char **command);

#include <sys/uio.h>

int remctl_commandv(struct remctl *r, const struct iovec *iov, size_t count);


remctl_command() and remctl_commandv() send a command to a remote remctl server. The remctl client object r, created with remctl_new(), should have previously been passed to remctl_open() to open a connection to the server.

remctl_command() 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.

remctl_commandv() takes the command as an array of iovec structs of length count. 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 writev(2) for the layout of the iovec struct.

To control the network timeout for sending the command, see the remctl_set_timeout(3) function.

After calling one of these functions, call remctl_output() to get the results of the command.


remctl_command() and remctl_commandv() return true on success and false on failure. On failure, the caller should call remctl_error() to retrieve the error message.


These interfaces have been provided by the remctl client library since its initial release in version 2.0.


Russ Allbery <>


Copyright 2007, 2009, 2014 The Board of Trustees of the Leland Stanford Junior University

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.


remctl_new(3), remctl_open(3), remctl_output(3), remctl_error(3)

The current version of the remctl library and complete details of the remctl protocol are available from its web page at <>.

Last modified and spun 2016-10-11