sd_bus_message_verify_type

systemd
sd_bus_message_verify_type 3
sd_bus_message_verify_type Check if the message has specified type at the current location

    #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.

## See Also

systemd 1, sd-bus 3, sd_bus_message_append 3