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port_create.md

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zx_port_create

SUMMARY

Create an IO port.

DECLARATION

#include <zircon/syscalls.h>

zx_status_t zx_port_create(uint32_t options, zx_handle_t* out);

DESCRIPTION

zx_port_create() creates a port: a waitable object that can be used to read packets queued by kernel or by user-mode.

If you need this port to be bound to an interrupt, pass ZX_PORT_BIND_TO_INTERRUPT to options, otherwise it should be 0.

In the case where a port is bound to an interrupt, the interrupt packets are delivered via a dedicated queue on ports and are higher priority than other non-interrupt packets.

The returned handle will have:

  • ZX_RIGHT_TRANSFER: allowing them to be sent to another process through zx_channel_write().
  • ZX_RIGHT_WRITE: allowing packets to be queued.
  • ZX_RIGHT_READ: allowing packets to be read.
  • ZX_RIGHT_DUPLICATE: allowing them to be duplicated.

RIGHTS

Caller job policy must allow ZX_POL_NEW_PORT.

RETURN VALUE

zx_port_create() returns ZX_OK and a valid IO port handle via out on success. In the event of failure, an error value is returned.

ERRORS

ZX_ERR_INVALID_ARGS options has an invalid value, or out is an invalid pointer or NULL.

ZX_ERR_NO_MEMORY Failure due to lack of memory. There is no good way for userspace to handle this (unlikely) error. In a future builds this error will no longer occur.

SEE ALSO