systemd 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: -ENOPKG The bus object bus could not be resolved. -ENOTCONN The input parameter bus is NULL or the bus is not connected. -ECHILD The bus object bus was created in a different process. sd_bus_can_send() was added in version 221. systemd1 sd-bus3