sd_bus_can_send - Man Page
Check which types can be sent over a bus object
Synopsis
#include <systemd/sd-bus.h>
void sd_bus_can_send(sd_bus *bus, char type);
Description
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.
Return Value
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.
Errors
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.
Notes
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.
History
sd_bus_can_send() was added in version 221.
See Also
Referenced By
sd-bus(3), sd_bus_negotiate_fds(3), systemd.directives(7), systemd.index(7).