sd_bus_set_fd(3) — Linux manual page


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

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

       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.

       Returned errors may indicate the following problems:

           An invalid bus object was passed.

           The bus connection was allocated in a parent process and is
           being reused in a child process after fork().

           An invalid file descriptor was passed to sd_bus_set_fd().

           The bus cannot be resolved.

           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

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systemd 249                                             SD_BUS_SET_FD(3)

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