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libwebsockets/lib/plat/unix/private.h

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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010 - 2018 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*
* Included from lib/core/private.h if no explicit platform
*/
#include <fcntl.h>
#include <strings.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <poll.h>
#include <netdb.h>
#ifndef __cplusplus
#include <errno.h>
#endif
#include <netdb.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <sys/un.h>
#if defined(LWS_HAVE_EVENTFD)
#include <sys/eventfd.h>
#endif
#if defined(__APPLE__)
#include <machine/endian.h>
#endif
#if defined(__FreeBSD__)
#include <sys/endian.h>
#endif
#if defined(__linux__)
#include <endian.h>
#endif
#if defined(__QNX__)
#include <gulliver.h>
#if defined(__LITTLEENDIAN__)
#define BYTE_ORDER __LITTLEENDIAN__
#define LITTLE_ENDIAN __LITTLEENDIAN__
#define BIG_ENDIAN 4321 /* to show byte order (taken from gcc); for suppres warning that BIG_ENDIAN is not defined. */
#endif
#if defined(__BIGENDIAN__)
#define BYTE_ORDER __BIGENDIAN__
#define LITTLE_ENDIAN 1234 /* to show byte order (taken from gcc); for suppres warning that LITTLE_ENDIAN is not defined. */
#define BIG_ENDIAN __BIGENDIAN__
#endif
#endif
#if defined(__sun) && defined(__GNUC__)
#include <arpa/nameser_compat.h>
#if !defined (BYTE_ORDER)
#define BYTE_ORDER __BYTE_ORDER__
#endif
#if !defined(LITTLE_ENDIAN)
#define LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__
#endif
#if !defined(BIG_ENDIAN)
#define BIG_ENDIAN __ORDER_BIG_ENDIAN__
#endif
#endif /* sun + GNUC */
#if !defined(BYTE_ORDER)
#define BYTE_ORDER __BYTE_ORDER
#endif
#if !defined(LITTLE_ENDIAN)
#define LITTLE_ENDIAN __LITTLE_ENDIAN
#endif
#if !defined(BIG_ENDIAN)
#define BIG_ENDIAN __BIG_ENDIAN
#endif
#if defined(LWS_BUILTIN_GETIFADDRS)
#include "./misc/getifaddrs.h"
#else
#if defined(__HAIKU__)
#define _BSD_SOURCE
#endif
#include <ifaddrs.h>
#endif
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#if defined (__sun) || defined(__HAIKU__) || defined(__QNX__) || defined(__ANDROID__)
#include <syslog.h>
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#if defined(__ANDROID__)
#include <sys/resource.h>
#endif
#else
#include <sys/syslog.h>
#endif
#ifdef __QNX__
# include "netinet/tcp_var.h"
# define TCP_KEEPINTVL TCPCTL_KEEPINTVL
# define TCP_KEEPIDLE TCPCTL_KEEPIDLE
# define TCP_KEEPCNT TCPCTL_KEEPCNT
#endif
#define LWS_ERRNO errno
#define LWS_EAGAIN EAGAIN
#define LWS_EALREADY EALREADY
#define LWS_EINPROGRESS EINPROGRESS
#define LWS_EINTR EINTR
#define LWS_EISCONN EISCONN
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#define LWS_ENOTCONN ENOTCONN
#define LWS_EWOULDBLOCK EWOULDBLOCK
#define LWS_EADDRINUSE EADDRINUSE
#define lws_set_blocking_send(wsi)
#define LWS_SOCK_INVALID (-1)
unix plat: add minimal wsi fd map option An lws context usually contains a processwide fd -> wsi lookup table. This allows any possible fd returned by a *nix type OS to be immediately converted to a wsi just by indexing an array of struct lws * the size of the highest possible fd, as found by ulimit -n or similar. This works modestly for Linux type systems where the default ulimit -n for a process is 1024, it means a 4KB or 8KB lookup table for 32-bit or 64-bit systems. However in the case your lws usage is much simpler, like one outgoing client connection and no serving, this represents increasing waste. It's made much worse if the system has a much larger default ulimit -n, eg 1M, the table is occupying 4MB or 8MB, of which you will only use one. Even so, because lws can't be sure the OS won't return a socket fd at any number up to (ulimit -n - 1), it has to allocate the whole lookup table at the moment. This patch looks to see if the context creation info is setting info->fd_limit_per_thread... if it leaves it at the default 0, then everything is as it was before this patch. However if finds that (info->fd_limit_per_thread * actual_number_of_service_threads) where the default number of service threads is 1, is less than the fd limit set by ulimit -n, lws switches to a slower lookup table scheme, which only allocates the requested number of slots. Lookups happen then by iterating the table and comparing rather than indexing the array directly, which is obviously somewhat of a performance hit. However in the case where you know lws will only have a very few wsi maximum, this method can very usefully trade off speed to be able to avoid the allocation sized by ulimit -n. minimal examples for client that can make use of this are also modified by this patch to use the smaller context allocations.
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struct lws_context;
struct lws *
wsi_from_fd(const struct lws_context *context, int fd);
int
insert_wsi(const struct lws_context *context, struct lws *wsi);
void
delete_from_fd(const struct lws_context *context, int fd);
#ifndef LWS_NO_FORK
#ifdef LWS_HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#endif
#define compatible_close(x) close(x)
#define lws_plat_socket_offset() (0)
/*
* Mac OSX as well as iOS do not define the MSG_NOSIGNAL flag,
* but happily have something equivalent in the SO_NOSIGPIPE flag.
*/
#ifdef __APPLE__
#define MSG_NOSIGNAL SO_NOSIGPIPE
#endif
/*
* Solaris 11.X only supports POSIX 2001, MSG_NOSIGNAL appears in
* POSIX 2008.
*/
#if defined(__sun) && !defined(MSG_NOSIGNAL)
#define MSG_NOSIGNAL 0
#endif