уведомить о запуске и остановке службы (notify service start and stop)
Имя (Name)
__pmServerNotifyServiceManagerReady,
__pmServerNotifyServiceManagerStopping - notify service start and
stop
Синопсис C (C Synopsis)
#include "pmapi.h"
#include "libpcp.h"
int __pmServerNotifyServiceManagerReady(pid_t mainpid);
int __pmServerNotifyServiceManagerStopping(pid_t mainpid);
cc ... -lpcp
Предостережение (Caveat)
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.
Описание (Description)
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.
Диагностика (Diagnostic)
These functions will print diagnostics to the stderr stream if
pmDebugOptions.services is set.
Возвращаемое значение (Return value)
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.
