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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_BUS_SET_FD(3) sd_bus_set_fd SD_BUS_SET_FD(3)
sd_bus_set_fd - Set the file descriptors to use for bus
communication
#include <systemd/sd-bus.h>
int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd);
sd_bus_set_fd() sets the file descriptors used to communicate by
a bus connection object. Both input_fd and output_fd must be
valid file descriptors, referring to stream-based file objects
(e.g. a stream socket, a pair of pipes or FIFOs, or even a TTY
device). input_fd must be readable, and output_fd must be
writable. The same file descriptor may be used (and typically is
used) as both the input and the output file descriptor. This
function must be called before the bus connection is started via
sd_bus_start(3).
The bus connection object will take possession of the passed file
descriptors and will close them automatically when it is freed.
Use sd_bus_set_close_on_exit(3) to turn off this behaviour.
On success, sd_bus_set_fd() returns a non-negative integer. On
failure, it returns a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-EINVAL
An invalid bus object was passed.
-ECHILD
The bus connection was allocated in a parent process and is
being reused in a child process after fork().
-EBADF
An invalid file descriptor was passed to sd_bus_set_fd().
-ENOPKG
The bus cannot be resolved.
-EPERM
The bus connection has already been started.
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-bus(3), sd_bus_get_fd(3), sd_bus_start(3)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2022-12-17. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-16.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 252 SD_BUS_SET_FD(3)
Pages that refer to this page: sd_bus_get_fd(3), sd_bus_start(3), systemd.directives(7), systemd.index(7)
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