NAME

       sd_bus_message_rewind - Return to beginning of message or current container

SYNOPSIS

       #include <systemd/sd-bus.h>

       int sd_bus_message_rewind(sd_bus_message *m, int complete);

DESCRIPTION

       sd_bus_message_rewind() moves the "read pointer" in the message m to either the beginning
       of the message (if complete is true) or to the beginning of the currently open container.
       If no container is open, complete has no effect.

RETURN VALUE

       On success, this function returns 0 or a positive integer. The value is zero if the
       current container or whole message in case no container is open is empty, and positive
       otherwise. On failure, it returns a negative errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           The m parameter is NULL.

       -EPERM
           The message m has not been sealed.

NOTES

       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.

HISTORY

       sd_bus_message_rewind() was added in version 240.

SEE ALSO

       systemd(1), sd-bus(3), sd_bus_message_read(3)