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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS...T_REPLY(3) sd_bus_message_set_expect_reply SD_BUS...T_REPLY(3)
sd_bus_message_set_expect_reply, sd_bus_message_get_expect_reply,
sd_bus_message_set_auto_start, sd_bus_message_get_auto_start,
sd_bus_message_set_allow_interactive_authorization,
sd_bus_message_get_allow_interactive_authorization - Set and
query bus message metadata
#include <systemd/sd-bus.h>
int sd_bus_message_set_expect_reply(sd_bus_message *message,
int b);
int sd_bus_message_get_expect_reply(sd_bus_message *message);
int sd_bus_message_set_auto_start(sd_bus_message *message,
int b);
int sd_bus_message_get_auto_start(sd_bus_message *message);
int
sd_bus_message_set_allow_interactive_authorization(sd_bus_message *message,
int b);
int
sd_bus_message_get_allow_interactive_authorization(sd_bus_message *message);
sd_bus_message_set_expect_reply() sets or clears the
NO_REPLY_EXPECTED flag on the message m. This flag matters only
for method call messages and is used to specify that no method
return or error reply is expected. It is ignored for other types.
Thus, for a method call message, calling
sd_bus_message_set_expect_reply(..., 0)
sets the flag and suppresses the reply.
sd_bus_message_get_expect_reply() checks if the NO_REPLY_EXPECTED
flag is set on the message m. It will return positive if it is
not set, and zero if it is.
sd_bus_message_set_auto_start() sets or clears the NO_AUTO_START
flag on the message m. When the flag is set, the bus must not
launch an owner for the destination name in response to this
message. Calling
sd_bus_message_set_auto_start(..., 0)
sets the flag.
sd_bus_message_get_auto_start() checks if the NO_AUTO_START flag
is set on the message m. It will return positive if it is not
set, and zero if it is.
sd_bus_message_set_allow_interactive_authorization() sets or
clears the ALLOW_INTERACTIVE_AUTHORIZATION flag on the message m.
Setting this flag informs the receiver that the caller is
prepared to wait for interactive authorization via polkit or a
similar framework. Note that setting this flag does not guarantee
that the receiver will actually perform interactive
authorization. Also, make sure to set a suitable message timeout
when using this flag since interactive authorization could
potentially take a long time as it depends on user input. If b is
non-zero, the flag is set.
sd_bus_message_get_allow_interactive_authorization() checks if
the ALLOW_INTERACTIVE_AUTHORIZATION flag is set on the message m.
It will return a positive integer if the flag is set. Otherwise,
it returns zero.
On success, these functions return a non-negative integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-EINVAL
The message parameter is NULL.
-EPERM
The message message is sealed when trying to set a flag.
The message message has wrong type.
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_message_set_expect_reply(),
sd_bus_message_get_expect_reply(),
sd_bus_message_set_auto_start(), and
sd_bus_message_get_auto_start() were added in version 240.
sd_bus_message_set_allow_interactive_authorization() and
sd_bus_message_get_allow_interactive_authorization() were added
in version 246.
systemd(1), sd-bus(3), sd_bus_set_description(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...T_REPLY(3)
Pages that refer to this page: sd-bus(3), sd-bus-errors(3), sd_bus_message_new(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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