HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH. |  |
NAME |SYNOPSIS |DESCRIPTION |RETURN VALUE |NOTES |HISTORY |SEE ALSO |COLOPHON | |
SD_BUS_SET_FD(3) sd_bus_set_fdSD_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, intinput_fd, intoutput_fd);
sd_bus_set_fd()sets the file descriptors used to communicate by a bus connection object. Bothinput_fd andoutput_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, andoutput_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 viasd_bus_start(3). The bus connection object will take possession of the passed file descriptors and will close them automatically when it is freed. Usesd_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 afterfork(). Added in version 248.-EBADF An invalid file descriptor was passed tosd_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 thelibsystemd pkg-config(1) file. The code described here usesgetenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not callsetenv(3) from a parallel thread. It is recommended to only do calls tosetenv()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 thesystemd (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 isnot part of the original manual page), send a mail to man-pages@man7.orgsystemd 258~rc2SD_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)
HTML rendering created 2025-09-06 byMichael Kerrisk, author ofThe Linux Programming Interface. For details of in-depthLinux/UNIX system programming training courses that I teach, lookhere. Hosting byjambit GmbH. | |