sd_bus_default_flush_close(3) — Linux manual page


SD_BUS_CLOSE(3)                 sd_bus_close                 SD_BUS_CLOSE(3)

NAME         top

       sd_bus_close, sd_bus_flush, sd_bus_default_flush_close - Close and
       flush a bus connection

SYNOPSIS         top

       #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);

DESCRIPTION         top

       sd_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 VALUE         top

       On success, sd_bus_flush() returns a non-negative integer. On
       failure, it returns a negative errno-style error code.

       Returned errors may indicate the following problems:

           The bus connection has been created in a different process.

NOTES         top

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

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_unref(3), sd_bus_set_close_on_exit(3)

COLOPHON         top

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systemd 247                                                  SD_BUS_CLOSE(3)

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