Путеводитель по Руководству Linux
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   sd_pid_notify_with_fds    ( 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  |

Примечание (Note)

These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.

These functions send a single datagram with the state string as payload to the AF_UNIX socket referenced in the $NOTIFY_SOCKET environment variable. If the first character of $NOTIFY_SOCKET is "@", the string is understood as Linux abstract namespace socket. The datagram is accompanied by the process credentials of the sending service, using SCM_CREDENTIALS.