Output the canonical hash of the originating transaction

Behaviour

  • Write the canonical hash of the originating transaction to the output buffer

Definition

int64_t otxn_id (
    uint32_t write_ptr,
    uint32_t write_len
);

Example

uint8_t txn_id[32];
int64_t bytes_written = 
    otxn_id(txn_id, 32);

Parameters

Name

Type

Description

write_ptr

uint32_t

Pointer to a buffer of to store the ID.

write_len

uint32_t

Length of the output buffer. Should be at least 32 bytes.

Return Code

Type

Description

int64_t

The number of bytes written

If negative, an error:
OUT_OF_BOUNDS

  • pointers/lengths specified outside of hook memory.

TOO_SMALL

  • output buffer was not large enough to hold the serialized object