Provided by: libsystemd-dev_251.4-1ubuntu7_amd64 bug


       sd_bus_wait - Wait for I/O on a bus connection


       #include <systemd/sd-bus.h>

       int sd_bus_wait(sd_bus *bus, uint64_t timeout_usec);


       sd_bus_wait() synchronously waits for I/O on the specified bus connection object. This
       function is supposed to be called whenever sd_bus_process(3) returns zero, indicating that
       no work is pending on the connection. Internally, this call invokes ppoll(2), to wait for
       I/O on the bus connection. If the timeout_sec parameter is specified, the call will block
       at most for the specified amount of time in ┬Ás. Pass UINT64_MAX to permit it to sleep

       After each invocation of sd_bus_wait() the sd_bus_process() call should be invoked in
       order to process any now pending I/O work.

       Note that sd_bus_wait() is suitable only for simple programs as it does not permit waiting
       for other I/O events. For more complex programs either connect the bus connection object
       to an external event loop using sd_bus_get_fd(3) or to an sd-event(3) event loop using


       If any I/O was seen, a positive value is returned, zero otherwise. If an error occurs, a
       negative errno-style error code is returned.

       Returned errors may indicate the following problems:

           An invalid bus object was passed.

           The bus connection was allocated in a parent process and is being reused in a child
           process after fork().

           The bus connection has been terminated already.


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


       systemd(1), sd-bus(3), sd_bus_process(3), sd_bus_get_fd(3), sd-event(3),