remctl_noop - Man Page

Send a NOOP message to a remctl server


#include <remctl.h>

int remctl_noop(struct remctl *r);


remctl_noop() sends a NOOP message to a remctl server and reads the expected NOOP 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.

The NOOP 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 remctl_open().

Return Value

remctl_noop() returns true on success and false on failure.  On failure, the caller should call remctl_error() to retrieve the error message.  In addition to network errors, this function may fail if the server doesn't support protocol version 3.


This interface was added in version 3.0.


Russ Allbery <>

See Also

remctl_new(3), remctl_open(3), remctl_command(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 <>.


2022-05-09 3.18 remctl Library Reference