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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | 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.
Added in version 248.
-ECHILD
The bus connection was allocated in a parent process and is
being reused in a child process after fork().
Added in version 248.
-EBADF
An invalid file descriptor was passed to sd_bus_set_fd().
Added in version 248.
-ENOPKG
The bus cannot be resolved.
Added in version 248.
-EPERM
The bus connection has already been started.
Added in version 248.
Functions described here are available as a shared library, which
can be compiled against and linked to with the
libsystemd pkg-config(1) file.
The code described here uses getenv(3), which is declared to be
not multi-thread-safe. This means that the code calling the
functions described here must not call setenv(3) from a parallel
thread. It is recommended to only do calls to setenv() from an
early phase of the program when no other threads have been
started.
sd_bus_set_fd() was added in version 248.
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) 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 258~rc2 SD_BUS_SET_FD(3)
Pages that refer to this page: sd-bus(3), sd_bus_get_fd(3), sd_bus_start(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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