nbd_set_socket_activation_name3

Usage

 #include <libnbd.h>
 int nbd_set_socket_activation_name (
       struct nbd_handle *h, const char *socket_name
     );

Overview

When running an NBD server using nbd_connect_systemd_socket_activation(3) you can optionally name the socket. Call this function before connecting to the server.

Some servers such as qemu-storage-daemon(1) can use this information to associate the socket with a name used on the command line, but most servers will ignore it. The name is passed through the "LISTEN_FDNAMES" environment variable.

The parameter "socket_name" can be a short alphanumeric string. If it is set to the empty string (also the default when the handle is created) then the name "unknown" will be seen by the server.

Return value

If the call is successful the function returns 0.

Errors

On error -1 is returned.

Refer to "ERROR HANDLING" in libnbd(3) for how to get further details of the error.

The following parameters must not be NULL: "h", "socket_name". For more information see "Non-NULL parameters" in libnbd(3).

Handle state

nbd_set_socket_activation_name can be called when the handle is in the following state:

 ┌─────────────────────────────────────┬─────────────────────────┐
 │ Handle created, before connecting   │ ✅ allowed              │
 │ Connecting                          │ ❌ error                │
 │ Connecting & handshaking (opt_mode) │ ❌ error                │
 │ Connected to the server             │ ❌ error                │
 │ Connection shut down                │ ❌ error                │
 │ Handle dead                         │ ❌ error                │
 └─────────────────────────────────────┴─────────────────────────┘

Version

This function first appeared in libnbd 1.16.

If you need to test if this function is available at compile time check if the following macro is defined:

 #define LIBNBD_HAVE_NBD_SET_SOCKET_ACTIVATION_NAME 1