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   sd_bus_set_fd    ( 3 )

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Имя (Name)

sd_bus_set_fd - Set the file descriptors to use for bus
       communication

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Синопсис (Synopsis)

#include <systemd/sd-bus.h>

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

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Описание (Description)

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.

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Возвращаемое значение (Return value)

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.

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Примечание (Note)

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

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Смотри также (See also)

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

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