SD_BUS_MESSAGE_VERIFY_TYPE(3)

  .SH "NAME" sd_bus_message_verify_type - Check if the message has specified type at the current location
  .SH "SYNOPSIS"

#include <systemd/sd-bus.h>

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

  .SH "DESCRIPTION"

    .PP 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.
    .PP 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.

  .SH "RETURN VALUE"

    .PP 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.

  .SH "ERRORS"

    .PP Returned errors may indicate the following problems:

      .PP -EINVAL

            m or both type and contents are NULL.

            Arguments do not satisfy other contraints listed above.

          .RE
          .PP -EPERM

                Message m is not sealed.
              .RE

          .SH "NOTES"

          .PP These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.
          .SH "SEE ALSO"

            .PP systemd(1), sd-bus(3), sd_bus_message_append(3)