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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | HISTORY | SEE ALSO | COLOPHON |
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SD_BUS_ME...READ_STRV(3) sd_bus_message_read_strvSD_BUS_ME...READ_STRV(3)
sd_bus_message_read_strv, sd_bus_message_read_strv_extend - Access
an array of strings in a message
#include <systemd/sd-bus.h>
int sd_bus_message_read_strv(sd_bus_message *m, char ***l);
int sd_bus_message_read_strv_extend(sd_bus_message *m, char ***l);
sd_bus_message_read_strv() reads an array of string-like items
from the message m. The "read pointer" in the message must be
right before an array of strings (D-Bus type "as"), object paths
(D-Bus type "ao"), or signatures (D-Bus type "ag"). On success, a
pointer to a NULL-terminated array of strings (strv) is returned
in the output parameter l. Note that ownership of this array is
transferred to the caller. Hence, the caller is responsible for
freeing this array and its contents. Also note that as a matter of
optimization, if an empty array is encountered a NULL pointer
might be returned here, and should be considered equivalent to an
array with zero entries.
sd_bus_message_read_strv_extend() is similar, but the second
parameter is an input-output parameter. If *l is NULL, if behaves
identically to sd_bus_message_read_strv(). Otherwise, *l must
point to a strv, which will be reallocated and extended with
additional strings. This function is particularly useful when
combining multiple lists of strings in a message or messages into
a single array of strings.
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
m or l are NULL.
Added in version 246.
-EPERM
The message is not sealed.
Added in version 246.
-EBADMSG
The message cannot be parsed.
Added in version 246.
-ENXIO
The message "read pointer" is not right before an array of the
appropriate type.
Added in version 248.
sd_bus_message_read_strv() was added in version 246.
sd_bus_message_read_strv_extend() was added in version 252.
systemd(1), sd-bus(3), sd_bus_message_read(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 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 is not part of the original manual page), send a mail to
man-pages@man7.org
systemd 258~rc2 SD_BUS_ME...READ_STRV(3)
Pages that refer to this page: sd-bus(3), sd_bus_message_read_array(3), systemd.directives(7), systemd.index(7)
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HTML rendering created 2025-09-06 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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