SD_BUS_CLOSE - Online Linux Manual PageSection : 3
Updated :
Source : systemd 250
Note : sd_bus_close

NAMEsd_bus_close, sd_bus_flush, sd_bus_default_flush_close − Close and flush a bus connection

SYNOPSIS#include <systemd/sd−bus​.h>void sd_bus_close(sd_bus *bus); int sd_bus_flush(sd_bus *bus); void sd_bus_default_flush_close(void);

DESCRIPTIONsd_bus_close() disconnects the specified bus connection​. When this call is invoked and the specified bus object refers to an active connection it is immediately terminated​. No further messages may be sent or received on it​. Any messages queued in the bus object (both incoming and outgoing) are released​. If invoked on NULL bus object or when the bus connection is already closed this function executes no operation​. This call does not free or unreference the bus object itself​. Use sd_bus_unref(3) for that​. sd_bus_flush() synchronously writes out all outgoing queued message on a bus connection if there are any​. This function call may block if the peer is not processing bus messages quickly​. Before a program exits it is usually a good idea to flush any pending messages with sd_bus_flush() and then close connections with sd_bus_close() to ensure that no unwritten messages are lost, no further messages may be queued and all incoming but unprocessed messages are released​. After both operations have been done, it is a good idea to also drop any remaining references to the bus object so that it may be freed​. Since these three operations are frequently done together a helper call sd_bus_flush_close_unref(3) is provided that combines them into one​. sd_bus_default_flush_close() is similar to sd_bus_flush_close_unref(), but does not take a bus pointer argument and instead iterates over any of the "default" buses opened by sd_bus_default(3), sd_bus_default_user(3), sd_bus_default_system(3), and similar calls​. sd_bus_default_flush_close() is particularly useful to clean up any buses opened using those calls before the program exits​.

RETURN VALUEOn success, sd_bus_flush() returns a non−negative integer​. On failure, it returns a negative errno−style error code​.

ErrorsReturned errors may indicate the following problems: −ECHILD The bus connection has been created in a different process​.

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

SEE ALSOsystemd(1), sd-bus(3), sd_bus_unref(3), sd_bus_set_close_on_exit(3)
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