table of contents
- bookworm 252.30-1~deb12u2
- bookworm-backports 254.16-1~bpo12+1
- testing 256.7-2
- unstable 256.7-2
SD_BUS_CAN_SEND(3) | sd_bus_can_send | SD_BUS_CAN_SEND(3) |
NAME¶
sd_bus_can_send - 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
-ENOTCONN
-ECHILD
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¶
systemd(1), sd-bus(3)
systemd 256 |