Struct Syscall 

pub struct Syscall;

System call interface for accessing the runtime environment.

The Syscall struct provides a collection of methods that abstract lower-level operations, such as retrieving message metadata (ID, size, source, value), fetching the program identifier, obtaining the current block height, and accessing environment variables.

These methods are essential for enabling on-chain applications to interact with the Gear runtime in a consistent manner. Depending on the target environment, different implementations are provided:

• For the WASM target, direct calls are made to gstd::msg and gstd::exec to fetch runtime data.
• In standard (std) environments, a mock implementation uses thread-local state for testing purposes.
• In no_std configurations without the std feature and not WASM target, the functions are marked as unimplemented.

Use these methods to retrieve contextual information about the current execution environment, ensuring that your program logic remains agnostic of the underlying platform specifics.

Implementations

impl Syscall

pub fn message_id() -> MessageId

pub fn message_size() -> usize

pub fn message_source() -> ActorId

pub fn message_value() -> u128

pub fn reply_to() -> Result<MessageId, Error>

pub fn reply_code() -> Result<ReplyCode, Error>

pub fn signal_from() -> Result<MessageId, Error>

pub fn signal_code() -> Result<Option<SignalCode>, Error>

pub fn program_id() -> ActorId

pub fn block_height() -> u32

pub fn block_timestamp() -> u64

pub fn value_available() -> u128

pub fn env_vars() -> EnvVars

impl Syscall

pub fn exit(_inheritor_id: ActorId) -> !