1SD_BUS_SET_FD(3)                 sd_bus_set_fd                SD_BUS_SET_FD(3)
2
3
4

NAME

6       sd_bus_set_fd - Set the file descriptors to use for bus communication
7

SYNOPSIS

9       #include <systemd/sd-bus.h>
10
11       int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd);
12

DESCRIPTION

14       sd_bus_set_fd() sets the file descriptors used to communicate by a bus
15       connection object. Both input_fd and output_fd must be valid file
16       descriptors, referring to stream-based file objects (e.g. a stream
17       socket, a pair of pipes or FIFOs, or a even a TTY device).  input_fd
18       must be readable, and output_fd must be writable. The same file
19       descriptor may be used (and typically is used) as both the input and
20       the output file descriptor. This function must be called before the bus
21       connection is started via sd_bus_start(3).
22
23       The bus connection object will take possession of the passed file
24       descriptors and will close them automatically when it is freed. Use
25       sd_bus_set_close_on_exit(3) to turn off this behaviour.
26

RETURN VALUE

28       On success, sd_bus_set_fd() returns a non-negative integer. On failure,
29       it returns a negative errno-style error code.
30
31   Errors
32       Returned errors may indicate the following problems:
33
34       -EINVAL
35           An invalid bus object was passed.
36
37       -ECHILD
38           The bus connection was allocated in a parent process and is being
39           reused in a child process after fork().
40
41       -EBADF
42           An invalid file descriptor was passed to sd_bus_set_fd().
43
44       -ENOPKG
45           The bus cannot be resolved.
46
47       -EPERM
48           The bus connection has already been started.
49

NOTES

51       These APIs are implemented as a shared library, which can be compiled
52       and linked to with the libsystemd pkg-config(1) file.
53

SEE ALSO

55       systemd(1), sd-bus(3), sd_bus_get_fd(3), sd_bus_start(3)
56
57
58
59systemd 248                                                   SD_BUS_SET_FD(3)
Impressum