ReplyTo

Answers a call parked with Hold().

Number	Selector	Blocking	Since
0x06 SVC_REPLY	(ticket in r3)	no	2.0

Err ReplyTo(Ticket t, uint32_t xlen, Handle grant);

Registers: (xlen, grant, -1, ticket) -> r0 status

The reply is the first xlen bytes of the answering thread's message box. Any thread of the space that parked the call may answer; a ticket answers once and is meaningless in other spaces. The call in hand, if any, is not affected.

Parameters

Name	Direction	Description
t	in	Ticket from Hold().
xlen	in	Reply length in bytes, at most MSG_BUF_SIZE.
grant	in	Handle (with PERM_TXFR) to copy to the caller, or -1.

Returns

ZUZU_OK, or an error code.

Errors

Error	Condition
ERR_NOENT	Unknown, already answered or forged ticket, or the caller has died.
ERR_BADHANDLE	The handle the call was received through has been closed.
ERR_NOPERM	That handle lacks PERM_WAIT, or grant lacks PERM_TXFR.
ERR_OVERFLOW	xlen is larger than MSG_BUF_SIZE.