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haproxy/include/haproxy/compat.h
Aurelien DARRAGON 07cbd8e074 MINOR: clock: add now_mono_time_fast() function 
Same as now_mono_time(), but for fast queries (less accurate)
Relies on coarse clock source (also known as fast clock source on
some systems).

Fallback to now_mono_time() if coarse source is not supported on the system.
2023-04-19 11:03:31 +02:00

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/*
* include/haproxy/compat.h
* Operating system compatibility interface.
*
* Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
*
* 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
* exclusively.
*
* 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
*/
#ifndef _HAPROXY_COMPAT_H
#define _HAPROXY_COMPAT_H
#include <limits.h>
#include <unistd.h>
/* This is needed on Linux for Netfilter includes */
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
/* These are a few short names for commonly used types whose size and sometimes
* signedness depends on the architecture. Be careful not to rely on a few
* common but wrong assumptions:
* - char is not always signed (ARM, AARCH64, PPC)
* - long is not always large enough for a pointer (Windows)
* These types are needed with the standard C API (string.h, printf, syscalls).
*
* When a fixed size is needed (protocol interoperability), better use the
* standard types provided by stdint.h:
* - size_t : unsigned int of default word size, large enough for any
* object in memory
* - ssize_t : signed int of default word size, used by some syscalls
* - uintptr_t : an unsigned int large enough to store any pointer
* - ptrdiff_t : a signed int large enough to hold a distance between 2 ptrs
* - int<size>_t : a signed int of <size> bits (8,16,32,64 work everywhere)
* - uint<size>_t : an unsigned int of <size> bits
*/
typedef signed char schar;
typedef unsigned char uchar;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;
typedef unsigned long long ullong;
typedef long long llong;
/* set any optional field in a struct to this type to save ifdefs. Its address
* will still be valid but it will not reserve any room nor require any
* initialization.
*/
typedef struct { } empty_t;
// Redefine some limits that are not present everywhere
#ifndef LLONG_MAX
# define LLONG_MAX 9223372036854775807LL
# define LLONG_MIN (-LLONG_MAX - 1LL)
#endif
#ifndef ULLONG_MAX
# define ULLONG_MAX (LLONG_MAX * 2ULL + 1)
#endif
#ifndef LONGBITS
#define LONGBITS ((unsigned int)sizeof(long) * 8)
#endif
#ifndef BITS_PER_INT
#define BITS_PER_INT (8*sizeof(int))
#endif
#ifndef __WORDSIZE
# if defined(__SIZEOF_LONG__) && __SIZEOF_LONG__ == 4
# define __WORDSIZE 32
# elif defined(__SIZEOF_LONG__) && __SIZEOF_LONG__ == 8
# define __WORDSIZE 64
# else
# error "Unknown machine word size (__WORDSIZE, __SIZEOF_LONG)"
# endif
#endif
#ifndef MIN
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#endif
/* this is for libc5 for example */
#ifndef TCP_NODELAY
#define TCP_NODELAY 1
#endif
#ifndef SHUT_RD
#define SHUT_RD 0
#endif
#ifndef SHUT_WR
#define SHUT_WR 1
#endif
/* only Linux defines it */
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
/* AIX does not define MSG_DONTWAIT. We'll define it to zero, and test it
* wherever appropriate.
*/
#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif
/* Only Linux defines MSG_MORE */
#ifndef MSG_MORE
#define MSG_MORE 0
#endif
/* On Linux 2.4 and above, MSG_TRUNC can be used on TCP sockets to drop any
* pending data. Let's rely on NETFILTER to detect if this is supported.
*/
#ifdef USE_NETFILTER
#define MSG_TRUNC_CLEARS_INPUT
#endif
/* Maximum path length, OS-dependant */
#ifndef MAXPATHLEN
#define MAXPATHLEN 128
#endif
/* longest UNIX socket name */
#ifndef UNIX_MAX_PATH
#define UNIX_MAX_PATH 108
#endif
/* On Linux, allows pipes to be resized */
#ifndef F_SETPIPE_SZ
#define F_SETPIPE_SZ (1024 + 7)
#endif
#if defined(USE_TPROXY) && defined(USE_NETFILTER)
#include <linux/types.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_ipv4.h>
#endif
/* On Linux, IP_TRANSPARENT and/or IP_FREEBIND generally require a kernel patch */
#if defined(USE_LINUX_TPROXY)
#if !defined(IP_FREEBIND)
#define IP_FREEBIND 15
#endif /* !IP_FREEBIND */
#if !defined(IP_TRANSPARENT)
#define IP_TRANSPARENT 19
#endif /* !IP_TRANSPARENT */
#if !defined(IPV6_TRANSPARENT)
#define IPV6_TRANSPARENT 75
#endif /* !IPV6_TRANSPARENT */
#endif /* USE_LINUX_TPROXY */
#if defined(IP_FREEBIND) \
|| defined(IP_BINDANY) \
|| defined(IPV6_BINDANY) \
|| defined(SO_BINDANY) \
|| defined(IP_TRANSPARENT) \
|| defined(IPV6_TRANSPARENT)
#define CONFIG_HAP_TRANSPARENT
#endif
/* We'll try to enable SO_REUSEPORT on Linux 2.4 and 2.6 if not defined.
* There are two families of values depending on the architecture. Those
* are at least valid on Linux 2.4 and 2.6, reason why we'll rely on the
* USE_NETFILTER define.
*/
#if !defined(SO_REUSEPORT) && defined(USE_NETFILTER)
#if defined(SO_REUSEADDR) && (SO_REUSEADDR == 2)
#define SO_REUSEPORT 15
#elif defined(SO_REUSEADDR) && (SO_REUSEADDR == 0x0004)
#define SO_REUSEPORT 0x0200
#endif /* SO_REUSEADDR */
#endif /* SO_REUSEPORT */
/* only Linux defines TCP_FASTOPEN */
#ifdef USE_TFO
#ifndef TCP_FASTOPEN
#define TCP_FASTOPEN 23
#endif
#ifndef TCP_FASTOPEN_CONNECT
#define TCP_FASTOPEN_CONNECT 30
#endif
#endif
/* If IPv6 is supported, define IN6_IS_ADDR_V4MAPPED() if missing. */
#if defined(IPV6_TCLASS) && !defined(IN6_IS_ADDR_V4MAPPED)
#define IN6_IS_ADDR_V4MAPPED(a) \
((((const uint32_t *) (a))[0] == 0) \
&& (((const uint32_t *) (a))[1] == 0) \
&& (((const uint32_t *) (a))[2] == htonl (0xffff)))
#endif
#if defined(__dietlibc__)
#include <strings.h>
#endif
/* crypt_r() has been present in glibc since 2.2 and on FreeBSD since 12.0
* (12000002). No other OS makes any mention of it for now. Feel free to add
* valid known combinations below if needed to relax the crypt() lock when
* using threads.
*/
#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 2)) \
|| (defined(__FreeBSD__) && __FreeBSD_version >= 1200002)
#define HA_HAVE_CRYPT_R
#endif
/* some backtrace() implementations are broken or incomplete, in this case we
* can replace them. We must not do it all the time as some are more accurate
* than ours.
*/
#ifdef USE_BACKTRACE
#if defined(__aarch64__)
/* on aarch64 at least from gcc-4.7.4 to 7.4.1 we only get a single entry, which
* is pointless. Ours works though it misses the faulty function itself,
* probably due to an alternate stack for the signal handler which does not
* create a new frame hence doesn't store the caller's return address.
*/
#elif defined(__clang__) && defined(__x86_64__)
/* this is on FreeBSD, clang 4.0 to 8.0 produce don't go further than the
* sighandler.
*/
#else
#define HA_HAVE_WORKING_BACKTRACE
#endif
#endif
/* dl_iterate_phdr() is available in GLIBC 2.2.4 and up. Let's round up to 2.3.x */
#if defined(USE_DL) && defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
#define HA_HAVE_DL_ITERATE_PHDR
#define HA_HAVE_DUMP_LIBS
#endif
/* malloc_trim() can be very convenient to reclaim unused memory especially
* from huge pattern files. It's available (and really usable) in glibc 2.8 and
* above.
*/
#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 8))
#include <malloc.h>
#define HA_HAVE_MALLOC_TRIM
#endif
/* glibc 2.26 includes a thread-local cache which makes it fast enough in threads */
#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 26))
#include <malloc.h>
#define HA_HAVE_FAST_MALLOC
#endif
/* glibc 2.33 provides mallinfo2() that overcomes mallinfo()'s type limitations */
#if (defined(__GNU_LIBRARY__) && (__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 33))
#include <malloc.h>
#define HA_HAVE_MALLINFO2
#endif
/* FreeBSD also has malloc_usable_size() but it requires malloc_np.h */
#if defined(USE_MEMORY_PROFILING) && defined(__FreeBSD__) && (__FreeBSD_version >= 700002)
#include <malloc_np.h>
#endif
/* macOS has a call similar to malloc_usable_size */
#if defined(__APPLE__)
#include <malloc/malloc.h>
#define malloc_usable_size malloc_size
#define HA_HAVE_MALLOC_ZONE
#define TCP_KEEPIDLE TCP_KEEPALIVE
#define TCP_INFO TCP_CONNECTION_INFO
#define tcp_info tcp_connection_info
#endif
/* Max number of file descriptors we send in one sendmsg(). Linux seems to be
* able to send 253 fds per sendmsg(), however musl is limited to 252, not sure
* about the other OSes.
*/
#define MAX_SEND_FD 252
/* Some bsd kernels (ie: FreeBSD) offer the FAST clock source as equivalent
* to Linux COARSE clock source. Aliasing COARSE to FAST on such systems when
* COARSE is not already defined.
*/
#if !defined(CLOCK_MONOTONIC_COARSE) && defined(CLOCK_MONOTONIC_FAST)
#define CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_FAST
#endif
#endif /* _HAPROXY_COMPAT_H */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*/
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