sd_bus_set_fd(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | COLOPHON

SD_BUS_SET_FD(3)              sd_bus_set_fd             SD_BUS_SET_FD(3)

NAME         top

       sd_bus_set_fd - Set the file descriptors to use for bus
       communication

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd);

DESCRIPTION         top

       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.

RETURN VALUE         top

       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.

NOTES         top

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

SEE ALSO         top

       systemd(1), sd-bus(3), sd_bus_get_fd(3), sd_bus_start(3)

COLOPHON         top

       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 2021-08-27.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-08-27.)  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 249                                             SD_BUS_SET_FD(3)

Pages that refer to this page: sd_bus_get_fd(3)sd_bus_start(3)