SD_BUS_MESSAGE_VERIFY_TYPE(3)                       sd_bus_message_verify_type

NAME
       sd_bus_message_verify_type - Check if the message has specified type at
       the current location

SYNOPSIS
       #include <systemd/sd-bus.h>

       int sd_bus_message_verify_type(sd_bus_message *m, char type,
                                      const char* contents);

DESCRIPTION
       sd_bus_message_verify_type() checks if the complete type at the current
       location in the message m matches the specified type and contents. If
       non-zero, parameter type must be one of the types specified in
       sd_bus_message_append(1). If non-null, parameter contents must be a
       valid sequence of complete types. If both type and contents are
       specified type must be a container type.

       If type is specified, the type in the message must match. If contents
       is specified, the type in the message must be a container type with
       this signature.

RETURN VALUE
       On success, this call returns true if the type matches and zero if not
       (the message m contains different data or the end of the message has
       been reached). On failure, it returns a negative errno-style error
       code.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           m or both type and contents are NULL.

           Arguments do not satisfy other constraints listed above.

       -EPERM
           Message m is not 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.

SEE ALSO
       systemd(1), sd-bus(3), sd_bus_message_append(3)

systemd 255                                      SD_BUS_MESSAGE_VERIFY_TYPE(3)