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SD_BUS_CAN_SEND(3) sd_bus_can_send SD_BUS_CAN_SEND(3)


sd_bus_can_send - Check which types can be sent over a bus object


#include <systemd/sd-bus.h>

void sd_bus_can_send(sd_bus *bus, char type);


sd_bus_can_send() is mostly used for checking if file descriptor passing is available on the given bus. type can be any of the SD_BUS_TYPE constants.


On failure, sd_bus_can_send() returns a negative errno-style error code. If values of the given type can be sent over the given bus, it returns a positive integer. Otherwise, it returns zero.


Returned errors may indicate the following problems:


The bus object bus could not be resolved.

Added in version 246.


The input parameter bus is NULL or the bus is not connected.

Added in version 246.


The bus object bus was created in a different process.

Added in version 246.


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

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.


sd_bus_can_send() was added in version 246.


systemd(1), sd-bus(3)

systemd 255