__pmservernotifyservicemanagerready(3) — Linux manual page



NAME         top

       __pmServerNotifyServiceManagerReady,  __pmServerNotifyServiceManager‐
       Stopping - notify service start and stop

C SYNOPSIS         top

       #include "pmapi.h"
       #include "libpcp.h"

       int __pmServerNotifyServiceManagerReady(pid_t mainpid);
       int __pmServerNotifyServiceManagerStopping(pid_t mainpid);

       cc ... -lpcp

CAVEAT         top

       This documentation is intended for internal Performance Co-Pilot
       (PCP) developer use.

       These interfaces are not part of the PCP APIs that are guaranteed to
       remain fixed across releases, and they may not work, or may provide
       different semantics at some point in the future.

DESCRIPTION         top

       Within the libraries and applications of the Performance Co-Pilot
       (PCP) these routines provide a convenient and portable interface to
       service manager APIs, such as sd_notify(3).

       PCP service daemons should call __pmServerNotifyServiceManagerReady
       immediately prior to entering their main loop, regardless of whether
       or not they have forked or daemonised.  This will notify the service
       manager (if any, depending on the platform) that the daemon service
       has started, and that the main process to be tracked is mainpid.

       Similarly when shutting down, service daemons should call
       __pmServerNotifyServiceManagerStopping to notify the service manager
       (if any) that the tracked process of the service has returned from
       it's main loop and is about to shut down.

       These routines are intended to be portable and thus no conditional
       code should be needed for any service daemon on any platform.

DIAGNOSTICS         top

       These functions will print diagnostics to the stderr stream if
       pmDebugOptions.services is set.

RETURN CODE         top

       If successful, __pmServerNotifyServiceManagerReady returns a positive
       integer that depends on the platform service manager.  In the case of
       systemd(1), the return code is from sd_notify(3).  If the platform
       supports systemd(1) but the NOTIFY_SOCKET environment variable is not
       set (as may be the case if the server program is started manually
       rather than by systemd(1)), the return code will be PM_ERR_GENERIC
       which will normally be ignored but a diagnostic will be printed if
       pmDebugOptions.services is set.  On platforms that have no service
       manager, the return code will be PM_ERR_NYI.  For backward
       compatibility on these platforms, the return code should be ignored.

COLOPHON         top

       This page is part of the PCP (Performance Co-Pilot) project.
       Information about the project can be found at ⟨http://www.pcp.io/⟩.
       If you have a bug report for this manual page, send it to
       pcp@groups.io.  This page was obtained from the project's upstream
       Git repository ⟨https://github.com/performancecopilot/pcp.git⟩ on
       2020-07-14.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-07-14.)  If you discover any
       rendering problems in this HTML version of the page, or you believe
       there is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to