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# zx_socket_write
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Write data to a socket.
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#include <zircon/syscalls.h>
zx_status_t zx_socket_write(zx_handle_t handle,
uint32_t options,
const void* buffer,
size_t buffer_size,
size_t* actual);
`zx_socket_write()` attempts to write *buffer_size* bytes to the socket specified
by *handle*. The pointer to *bytes* may be NULL if *buffer_size* is zero.
If a NULL *actual* is passed in, it will be ignored.
A **ZX_SOCKET_STREAM** socket write can be short if the socket does not have
enough space for all of *buffer*. If a non-zero amount of data was written to
the socket, the amount written is returned via *actual* and the call succeeds.
Otherwise, if the socket was already full, the call returns
**ZX_ERR_SHOULD_WAIT** and the client should wait (e.g., with
[`zx_object_wait_one()`] or [`zx_object_wait_async()`]).
A **ZX_SOCKET_DATAGRAM** socket write is never short. If the socket has
insufficient space for *buffer*, it writes nothing and returns
**ZX_ERR_SHOULD_WAIT**. If the write succeeds, *buffer_size* is returned via
*actual*. Attempting to write a packet larger than the datagram socket's
capacity will fail with **ZX_ERR_OUT_OF_RANGE**.
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*handle* must be of type **ZX_OBJ_TYPE_SOCKET** and have **ZX_RIGHT_WRITE**.
`zx_socket_write()` returns **ZX_OK** on success.
**ZX_ERR_BAD_HANDLE** *handle* is not a valid handle.
**ZX_ERR_BAD_STATE** writing has been disabled for this socket endpoint via [`zx_socket_shutdown()`].
**ZX_ERR_WRONG_TYPE** *handle* is not a socket handle.
**ZX_ERR_INVALID_ARGS** *buffer* is an invalid pointer.
**ZX_ERR_ACCESS_DENIED** *handle* does not have **ZX_RIGHT_WRITE**.
**ZX_ERR_SHOULD_WAIT** The buffer underlying the socket is full.
**ZX_ERR_OUT_OF_RANGE** The socket was created with **ZX_SOCKET_DATAGRAM** and
*buffer* is larger than the remaining space in the socket.
**ZX_ERR_PEER_CLOSED** The other side of the socket is closed.
**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 build this error will no longer occur.
- [`zx_socket_create()`]
- [`zx_socket_read()`]
- [`zx_socket_shutdown()`]
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