port_queue.md

zx_port_queue

NAME

port_queue - queue a packet to an port

SYNOPSIS

#include <zircon/syscalls.h>
#include <zircon/syscalls/port.h>

zx_status_t zx_port_queue(zx_handle_t handle, const void* packet, size_t size);

DESCRIPTION

port_queue() queues a packet to the port specified by handle. The packet must be of type zx_port_packet and size should be set to zero.

typedef struct zx_port_packet {
    uint64_t key;
    uint32_t type;
    int32_t status;
    union {
        zx_packet_user_t user;
        zx_packet_signal_t signal;
    };
} zx_port_packet_t;

In zx type should be ZX_PKT_TYPE_USER and only the user union element is considered valid:

typedef union zx_packet_user {
    uint64_t u64[4];
    uint32_t u32[8];
    uint16_t u16[16];
    uint8_t   c8[32];
} zx_packet_user_t;

RETURN VALUE

port_queue() returns ZX_OK on successful queue of a packet.

ERRORS

ZX_ERR_INVALID_ARGS handle isn't a valid port handle, or packet is an invalid pointer.

ZX_ERR_WRONG_TYPE size is not zero or handle is not a port handle.

ZX_ERR_ACCESS_DENIED handle does not have ZX_RIGHT_WRITE.

NOTES

The queue is drained by calling port_wait().

SEE ALSO

port_create. port_wait.