sd_bus_get_name

Name

sd_bus_get_name_creds, sd_bus_get_owner_creds — Query bus client credentials

Synopsis

#include <systemd/sd-bus.h>

`int sd_bus_get_name_creds(`	sd_bus *`bus`,
	const char *`name`,
	uint64_t `mask`,
	sd_bus_creds **`creds)`;

`int sd_bus_get_owner_creds(`	sd_bus *`bus`,
	uint64_t `mask`,
	sd_bus_creds **`creds)`;

Description¶

sd_bus_get_name_creds() queries the credentials of the bus client identified by name. The mask parameter is a combo of SD_BUS_CREDS_* flags that indicate which credential info the caller is interested in. See sd_bus_creds_new_from_pid(3) for a list of possible flags. On success, creds contains a new sd_bus_creds instance with the requested information. Ownership of this instance belongs to the caller and it should be freed once no longer needed by calling sd_bus_creds_unref(3).

sd_bus_get_owner_creds() queries the credentials of the creator of the given bus. The mask and creds parameters behave the same as in sd_bus_get_name_creds().

Return Value¶

On success, these functions return a non-negative integer. On failure, they return a negative errno-style error code.

Errors¶

Returned errors may indicate the following problems:

-EINVAL¶: An argument is invalid.
-ENOPKG¶: The bus cannot be resolved.
-EPERM¶: The bus has already been started.
-ECHILD¶: The bus was created in a different process, library or module instance.
-ENOMEM¶: Memory allocation failed.

Notes¶

Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd pkg-config(1) file.

All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time. Different threads may access the same object at different times. Multiple independent objects may be used from different threads in parallel.

The code described here uses getenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call setenv(3) from a parallel thread. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started.

History¶

sd_bus_get_name_creds() and sd_bus_get_owner_creds() were added in version 221.