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sd_bus_message_set_destination(3) — Linux manual page

SD_BUS_...INATION(3)  sd_bus_message_set_destinationSD_BUS_...INATION(3)

NAME        top

       sd_bus_message_set_destination, sd_bus_message_get_destination,       sd_bus_message_get_path, sd_bus_message_get_interface,       sd_bus_message_get_member, sd_bus_message_set_sender,       sd_bus_message_get_sender - Set and query bus message addressing       information

SYNOPSIS        top

#include <systemd/sd-bus.h>int sd_bus_message_set_destination(sd_bus_message *message,const char *destination);const char*sd_bus_message_get_destination(sd_bus_message *message);const char* sd_bus_message_get_path(sd_bus_message *message);const char* sd_bus_message_get_interface(sd_bus_message *message);const char* sd_bus_message_get_member(sd_bus_message *message);int sd_bus_message_set_sender(sd_bus_message *message,const char *sender);const char* sd_bus_message_get_sender(sd_bus_message *message);

DESCRIPTION        top

sd_bus_message_set_destination()sets the destination service name       for the specified bus message object. The specified name must be a       valid unique or well-known service name.sd_bus_message_get_destination(),sd_bus_message_get_path(),sd_bus_message_get_interface(), andsd_bus_message_get_member()       return the destination, path, interface, and member fields frommessage header. The return value will beNULLismessage isNULL       or the message is of a type that does not use those fields or the       message does not have them set. Seesd_bus_message_new_method_call(3) andsd_bus_message_set_destination(3) for more discussion of those       values.sd_bus_message_set_sender()sets the sender service name for the       specified bus message object. The specified name must be a valid       unique or well-known service name. This function is useful only       for messages to send on direct connections as for connections to       bus brokers the broker will fill in the destination field anyway,       and the sender field set by original sender is ignored.sd_bus_message_get_sender()returns the sender field frommessage.       When a string is returned, it is a pointer to internal storage,       and may not be modified or freed. It is only valid as long as themessage remains referenced and this field has not been changed by       a different call.

RETURN VALUE        top

       On success, these calls return 0 or a positive integer. On       failure, these calls return a negative errno-style error code.Errors       Returned errors may indicate the following problems:-EINVAL           Themessage parameter or the output parameter areNULL.-EPERM           Forsd_bus_message_set_destination()andsd_bus_message_set_sender(), the message is already sealed.-EEXIST           The message already has a destination or sender field set.

NOTES        top

       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.

HISTORY        top

sd_bus_message_set_destination()andsd_bus_message_set_sender()       were added in version 237.sd_bus_message_get_destination(),sd_bus_message_get_path(),sd_bus_message_get_interface(),sd_bus_message_get_member(), andsd_bus_message_get_sender()were added in version 240.

SEE ALSO        top

systemd(1),sd-bus(3),sd_bus_new(3),sd_bus_set_sender(3)

COLOPHON        top

       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_...INATION(3)

Pages that refer to this page:sd-bus(3), sd_bus_message_get_type(3), sd_bus_message_new_signal(3), sd_bus_message_set_destination(3), sd_bus_send(3), sd_bus_set_sender(3), systemd.directives(7), systemd.index(7)

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