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port_queue.md

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zx_port_queue

SUMMARY

Queue a packet to a port.

DECLARATION

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

zx_status_t zx_port_queue(zx_handle_t handle, const zx_port_packet_t* packet);

DESCRIPTION

zx_port_queue() queues a user packet to the port specified by handle.

User packets are drained by zx_port_wait(). Failure to drain packets in a timely fashion can cause excessive kernel memory to be used, which might generate an exception. See ipc limits for details.

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

In packet 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;

RIGHTS

handle must be of type ZX_OBJ_TYPE_PORT and have ZX_RIGHT_WRITE.

RETURN VALUE

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

ERRORS

ZX_ERR_BAD_HANDLE handle isn't a valid handle

ZX_ERR_INVALID_ARGS packet is an invalid pointer.

ZX_ERR_WRONG_TYPE handle is not a port handle.

ZX_ERR_ACCESS_DENIED handle does not have ZX_RIGHT_WRITE.

SEE ALSO