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interrupt_bind.md

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zx_interrupt_bind

NAME

interrupt_bind - Bind an interrupt object to a port

SYNOPSIS

#include <zircon/syscalls.h>

zx_status_t zx_interrupt_bind(zx_handle_t handle,
                              zx_handle_t port_handle,
                              uint64_t key,
                              uint32_t options);

DESCRIPTION

zx_interrupt_bind() binds an interrupt object to a port.

An interrupt object may only be bound to a single port and may only be bound once. The interrupt can only bind to a port which is created with ZX_PORT_BIND_TO_INTERRUPT option.

When a bound interrupt object is triggered, a ZX_PKT_TYPE_INTERRUPT packet will be delivered to the port it is bound to, with the timestamp (relative to ZX_CLOCK_MONOTONIC) of when the interrupt was triggered in the zx_packet_interrupt_t. The key used when binding the interrupt will be present in the key field of the zx_port_packet_t.

Before another packet may be delivered, the bound interrupt must be re-armed using the zx_interrupt_ack() syscall. This is (in almost all cases) best done after the interrupt packet has been fully processed. Especially in the case of multiple threads reading packets from a port, if the processing thread re-arms the interrupt and it has triggered, a packet will immediately be delivered to a waiting thread.

Interrupt packets are delivered via a dedicated queue on ports and are higher priority than non-interrupt packets.

RIGHTS

handle must be of type ZX_OBJ_TYPE_INTERRUPT and have ZX_RIGHT_READ.

port_handle must be of type ZX_OBJ_TYPE_PORT and have ZX_RIGHT_WRITE.

RETURN VALUE

zx_interrupt_bind() returns ZX_OK on success. In the event of failure, a negative error value is returned.

ERRORS

ZX_ERR_BAD_HANDLE handle or port_handle is not a valid handle.

ZX_ERR_WRONG_TYPE handle is not an interrupt object or port_handle is not a port object.

ZX_ERR_CANCELED zx_interrupt_destroy() was called on handle.

ZX_ERR_BAD_STATE A thread is waiting on the interrupt using zx_interrupt_wait()

ZX_ERR_ACCESS_DENIED the handle handle lacks ZX_RIGHT_READ or the port_handle handle lacks ZX_RIGHT_WRITE

ZX_ERR_ALREADY_BOUND this interrupt object is already bound.

ZX_ERR_INVALID_ARGS options contains a non-zero value.

SEE ALSO