ReplyRecv¶

Answers the call in hand (if any), then waits for the next one, in one syscall.

Number	Selector	Blocking	Since
`0x06` SVC_REPLY	—	yes	2.0

SvcResult ReplyRecv(uint32_t xlen, Handle grant_handle, Handle recv_port, Duration timeout);

Registers: (xlen, grant, port, timeout) -> r0 status, r1 marker, r2 length, r3 granted handle

The usual server loop. Returns like WaitOn() on recv_port.

Parameters¶

Name	Direction	Description
`xlen`	in	Reply length in bytes, at most MSG_BUF_SIZE.
`grant_handle`	in	Handle (with PERM_TXFR) to copy to the caller, or -1.
`recv_port`	in	Port to receive on, with PERM_WAIT.
`timeout`	in	Milliseconds to wait, or TIMEOUT_POLL / TIMEOUT_INFINITE.

r0 is the status; r1-r3 as for WaitOn() on a port.

Error	Condition
`ERR_TIMEOUT`	No call within `timeout`.
`ERR_OVERFLOW`	`xlen` is larger than MSG_BUF_SIZE.
`ERR_BADHANDLE`	`recv_port` or `grant_handle` is not a live handle.
`ERR_BADTYPE`	`recv_port` is not a port.
`ERR_NOPERM`	`recv_port` lacks PERM_WAIT, or `grant_handle` lacks PERM_TXFR.
`ERR_DEAD`	`recv_port` has died.