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NAME | SYNOPSIS | DESCRIPTION | EXAMPLES | RETURN VALUE | NOTES | SEE ALSO | COLOPHON |
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SD_BUS_MESSAGE_DUMP(3) sd_bus_message_dump SD_BUS_MESSAGE_DUMP(3)
sd_bus_message_dump - Produce a string representation of a
message for debugging purposes
#include <systemd/sd-bus.h>
int sd_bus_message_dump(sd_bus_message *m, FILE *f,
uint64_t flags);
SD_BUS_MESSAGE_DUMP_WITH_HEADER, SD_BUS_MESSAGE_DUMP_SUBTREE_ONLY
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).
Output for a signal message (with
SD_BUS_MESSAGE_DUMP_WITH_HEADER):
> 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";
};
};
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.
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.
systemd(1), sd-bus(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 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) 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
[email protected]
systemd 257~devel SD_BUS_MESSAGE_DUMP(3)
Pages that refer to this page: sd-bus(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2024-06-26 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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