sd_bus_message_dump(3) — Linux manual page


SD_BUS_MESSAGE_DUMP(3)     sd_bus_message_dump    SD_BUS_MESSAGE_DUMP(3)

NAME         top

       sd_bus_message_dump - Produce a string representation of a
       message for debugging purposes

SYNOPSIS         top

       #include <systemd/sd-bus.h>

       int sd_bus_message_dump(sd_bus_message *m, FILE *f,
                               uint64_t flags);


DESCRIPTION         top

       The sd_bus_message_dump() function writes a textual
       representation of the message m to the stream f. If f is NULL,
       standard output (stdio) will be used. This function is intended
       to be used for debugging purposes, and the output is neither
       stable nor designed to be machine readable.

       The flags parameter may be used to modify the output. With
       SD_BUS_MESSAGE_DUMP_WITH_HEADER, a header that specifies the
       message type and flags and some additional metadata is printed.
       When SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY is not passed, the contents
       of the whole message are printed. When it is passed, only the
       current container in printed.

       Note that this function moves the read pointer of the message. It
       may be necessary to reset the position afterwards, for example
       with sd_bus_message_rewind(3).

EXAMPLES         top

       Output for a signal message (with

           > Type=signal  Endian=l  Flags=1  Version=1  Cookie=22
             Path=/value/a  Interface=org.freedesktop.DBus.Properties  Member=PropertiesChanged
             MESSAGE "sa{sv}as" {
                     STRING "org.freedesktop.systemd.ValueTest";
                     ARRAY "{sv}" {
                             DICT_ENTRY "sv" {
                                     STRING "Value";
                                     VARIANT "s" {
                                             STRING "object 0x1e, path /value/a";
                     ARRAY "s" {
                             STRING "Value2";
                             STRING "AnExplicitProperty";

RETURN VALUE         top

       On success, this function returns 0 or a positive integer. On
       failure, it returns a negative errno-style error code. No error
       codes are currently defined.

NOTES         top

       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

SEE ALSO         top

       systemd(1), sd-bus(3)

COLOPHON         top

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       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2023-12-22.  (At that
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systemd 255                                       SD_BUS_MESSAGE_DUMP(3)

Pages that refer to this page: sd-bus(3)systemd.directives(7)systemd.index(7)