Путеводитель по Руководству Linux

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   sd_notify    ( 3 )

уведомлять сервисного менеджера о завершении запуска и других изменениях статуса сервиса (notify service manager about start-up completion and other service status changes)

  Name  |  Synopsis  |  Description  |    Return value    |  Note  |  Environment  |  Examples  |  See also  |

Возвращаемое значение (Return value)

On failure, these calls return a negative errno-style error code. If $NOTIFY_SOCKET was not set and hence no status message could be sent, 0 is returned. If the status was sent, these functions return a positive value. In order to support both service managers that implement this scheme and those which do not, it is generally recommended to ignore the return value of this call. Note that the return value simply indicates whether the notification message was enqueued properly, it does not reflect whether the message could be processed successfully. Specifically, no error is returned when a file descriptor is attempted to be stored using FDSTORE=1 but the service is not actually configured to permit storing of file descriptors (see above).