SD_BUS_GET_N_QUEUED_READ(3) sd_bus_get_fd SD_BUS_GET_N_QUEUED_READ(3)
sd_bus_get_n_queued_read, sd_bus_get_n_queued_write - Get the number of pending bus messages in the read and write queues of a bus connection object
#include <systemd/sd-bus.h> int sd_bus_get_n_queued_read(sd_bus *bus, uint64_t *ret); int sd_bus_get_n_queued_write(sd_bus *bus, uint64_t *ret);
sd_bus_get_n_queued_read() may be used to query the number of bus messages in the read queue of a bus connection object. The read queue contains all messages read from the transport medium (e.g. network socket) but not yet processed locally. The function expects two arguments: the bus object to query, and a pointer to a 64bit counter variable to write the current queue size to. Use sd_bus_process() in order to process queued messages, i.e. to reduce the size of the read queue (as well as, in fact, the write queue, see below). Similarly, sd_bus_get_n_queued_write() may be used to query the number of currently pending bus messages in the write queue of a bus connection object. The write queue contains all messages enqueued into the connection with a call such as sd_bus_send() but not yet written to the transport medium. The expected arguments are similar to sd_bus_get_n_queued_read(). Here too, use sd_bus_process() to reduce the size of the write queue. Alternatively, use sd_bus_flush() to synchronously write out any pending bus messages until the write queue is empty.
On success, these functions return 0 or a positive integer. On failure, they return a negative errno-style error code. Errors Returned errors may indicate the following problems: -ECHILD The bus connection was created in a different process.
systemd(1), sd-bus(3), sd_bus_process(3), sd_bus_send(3), sd_bus_flush(3)
This page is part of the systemd (systemd system and service manager) project. Information about the project can be found at ⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug report for this manual page, see ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This page was obtained from the project's upstream Git repository ⟨https://github.com/systemd/systemd.git⟩ on 2020-06-09. (At that time, the date of the most recent commit that was found in the repos‐ itory was 2020-06-09.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to email@example.com systemd 245 SD_BUS_GET_N_QUEUED_READ(3)
Pages that refer to this page: sd-bus(3), 30-systemd-environment-d-generator(7), systemd.directives(7), systemd.index(7)