Socket adoption helpers

Data Structures
union	lws_sock_file_fd_type
union	lws_sockaddr46
struct	lws_adopt_desc

Macros
#define	sa46_sockaddr(_sa46)   ((struct sockaddr *)(_sa46))
#define	sa46_socklen(_sa46)   (socklen_t)sizeof(struct sockaddr_in)
#define	sa46_sockport(_sa46, _sp)   (_sa46)->sa4.sin_port = (_sp)
#define	sa46_address(_sa46)   (uint8_t *)&_sa46->sa4.sin_addr
#define	sa46_address_len(_sa46)   ((_sa46)->sa4.sin_family == AF_INET ? 4 : 16)
#define	LWS_CAUDP_BIND   (1 << 0)
#define	LWS_CAUDP_BROADCAST   (1 << 1)
#define	LWS_CAUDP_PF_PACKET   (1 << 2)

Typedefs
typedef struct lws_adopt_desc	lws_adopt_desc_t

Enumerations
enum	lws_adoption_type {   LWS_ADOPT_RAW_FILE_DESC = 0 , LWS_ADOPT_HTTP = 1 , LWS_ADOPT_SOCKET = 2 , LWS_ADOPT_ALLOW_SSL = 4 ,   LWS_ADOPT_FLAG_UDP = 16 , LWS_ADOPT_FLAG_RAW_PROXY = 32 , LWS_ADOPT_RAW_SOCKET_UDP = LWS_ADOPT_SOCKET | LWS_ADOPT_FLAG_UDP }

Functions
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_socket (struct lws_context *context, lws_sockfd_type accept_fd)
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_socket_vhost (struct lws_vhost *vh, lws_sockfd_type accept_fd)
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_descriptor_vhost (struct lws_vhost *vh, lws_adoption_type type, lws_sock_file_fd_type fd, const char *vh_prot_name, struct lws *parent)
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_descriptor_vhost_via_info (const lws_adopt_desc_t *info)
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_socket_readbuf (struct lws_context *context, lws_sockfd_type accept_fd, const char *readbuf, size_t len)
LWS_VISIBLE LWS_EXTERN struct lws *	lws_adopt_socket_vhost_readbuf (struct lws_vhost *vhost, lws_sockfd_type accept_fd, const char *readbuf, size_t len)

Detailed Description

Socket adoption helpers

When integrating with an external app with its own event loop, these can be used to accept connections from someone else's listening socket.

When using lws own event loop, these are not needed.

Function Documentation

lws_adopt_descriptor_vhost()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_descriptor_vhost	(	struct lws_vhost *	vh,
		lws_adoption_type	type,
		lws_sock_file_fd_type	fd,
		const char *	vh_prot_name,
		struct lws *	parent
	)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_descriptor_vhost() - adopt foreign socket or file descriptor if socket descriptor, should already have been accepted from listen socket

Parameters

vh	lws vhost
type	OR-ed combinations of lws_adoption_type flags
fd	union with either .sockfd or .filefd set
vh_prot_name	NULL or vh protocol name to bind raw connection to
parent	NULL or struct lws to attach new_wsi to as a child

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

If LWS_ADOPT_SOCKET is set, LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

parent may be NULL, if given it should be an existing wsi that will become the parent of the new wsi created by this call.

lws_adopt_descriptor_vhost_via_info()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_descriptor_vhost_via_info

(

const lws_adopt_desc_t *

info

)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_descriptor_vhost_via_info() - adopt foreign socket or file descriptor if socket descriptor, should already have been accepted from listen socket

Parameters

info	the struct containing the parameters

• vh: lws vhost
• type: OR-ed combinations of lws_adoption_type flags
• fd: union with either .sockfd or .filefd set
• vh_prot_name: NULL or vh protocol name to bind raw connection to
• parent: NULL or struct lws to attach new_wsi to as a child
• opaque: opaque pointer to set on created wsi

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

If LWS_ADOPT_SOCKET is set, LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

parent may be NULL, if given it should be an existing wsi that will become the parent of the new wsi created by this call.

lws_adopt_socket()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket	(	struct lws_context *	context,
		lws_sockfd_type	accept_fd
	)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_socket() - adopt foreign socket as if listen socket accepted it for the default vhost of context.

Parameters

context	lws context
accept_fd	fd of already-accepted socket to adopt

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

lws_adopt_socket_readbuf()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket_readbuf	(	struct lws_context *	context,
		lws_sockfd_type	accept_fd,
		const char *	readbuf,
		size_t	len
	)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_socket_readbuf() - adopt foreign socket and first rx as if listen socket accepted it for the default vhost of context.

Parameters

context	lws context
accept_fd	fd of already-accepted socket to adopt
readbuf	NULL or pointer to data that must be drained before reading from accept_fd
len	The length of the data held at readbuf

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

If your external code did not already read from the socket, you can use lws_adopt_socket() instead.

This api is guaranteed to use the data at readbuf first, before reading from the socket.

readbuf is limited to the size of the ah rx buf, currently 2048 bytes.

lws_adopt_socket_vhost()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket_vhost	(	struct lws_vhost *	vh,
		lws_sockfd_type	accept_fd
	)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_socket_vhost() - adopt foreign socket as if listen socket accepted it for vhost

Parameters

vh	lws vhost
accept_fd	fd of already-accepted socket to adopt

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

lws_adopt_socket_vhost_readbuf()

LWS_VISIBLE LWS_EXTERN struct lws* lws_adopt_socket_vhost_readbuf	(	struct lws_vhost *	vhost,
		lws_sockfd_type	accept_fd,
		const char *	readbuf,
		size_t	len
	)

#include <include/libwebsockets/lws-adopt.h>

lws_adopt_socket_vhost_readbuf() - adopt foreign socket and first rx as if listen socket accepted it for vhost.

Parameters

vhost	lws vhost
accept_fd	fd of already-accepted socket to adopt
readbuf	NULL or pointer to data that must be drained before reading from accept_fd
len	The length of the data held at readbuf

Either returns new wsi bound to accept_fd, or closes accept_fd and returns NULL, having cleaned up any new wsi pieces.

LWS adopts the socket in http serving mode, it's ready to accept an upgrade to ws or just serve http.

If your external code did not already read from the socket, you can use lws_adopt_socket() instead.

This api is guaranteed to use the data at readbuf first, before reading from the socket.

readbuf is limited to the size of the ah rx buf, currently 2048 bytes.