revert back: link ydbd with pg wrapper to support pg types

6 files changed, 1909 insertions, 0 deletions

diff --git a/contrib/libs/icu/CMakeLists.txt b/contrib/libs/icu/CMakeLists.txt
new file mode 100644
index 00000000000..b2678bda6c9
--- /dev/null
+++ b/contrib/libs/icu/CMakeLists.txt
@@ -0,0 +1,475 @@
+
+# This file was gererated by the build system used internally in the Yandex monorepo.
+# Only simple modifications are allowed (adding source-files to targets, adding simple properties
+# like target_include_directories). These modifications will be ported to original
+# ya.make files by maintainers. Any complex modifications which can't be ported back to the
+# original buildsystem will not be accepted.
+
+
+
+add_library(contrib-libs-icu)
+target_compile_options(contrib-libs-icu PRIVATE
+  -DU_COMMON_IMPLEMENTATION
+  -DU_I18N_IMPLEMENTATION
+  -DU_IO_IMPLEMENTATION
+  -DU_STATIC_IMPLEMENTATION
+  -Wno-everything
+)
+target_include_directories(contrib-libs-icu PUBLIC
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/include
+)
+target_include_directories(contrib-libs-icu PRIVATE
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io
+)
+target_link_libraries(contrib-libs-icu PUBLIC
+  contrib-libs-cxxsupp
+)
+target_sources(contrib-libs-icu PRIVATE
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/appendable.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bmpset.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/brkeng.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/brkiter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bytesinkutil.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bytestream.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bytestrie.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bytestriebuilder.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/bytestrieiterator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/caniter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/characterproperties.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/chariter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/charstr.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/cmemory.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/cstr.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/cstring.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/cwchar.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/dictbe.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/dictionarydata.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/dtintrv.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/edits.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/errorcode.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/filteredbrk.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/filterednormalizer2.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/icudataver.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/icuplug.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/loadednormalizer2impl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/localebuilder.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/localematcher.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/localeprioritylist.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locavailable.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locbased.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locdispnames.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locdistance.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locdspnm.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locid.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/loclikely.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/loclikelysubtags.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locmap.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locresdata.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/locutil.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/lsr.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/messagepattern.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/normalizer2.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/normalizer2impl.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/pluralmap.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbidata.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbinode.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbirb.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbiscan.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbistbl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/rbbitblb.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/resbund.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/resbund_cnv.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/servls.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/servnotf.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/ucnv2022.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/ucnv_bld.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/ucnv_cb.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/ucnv_cnv.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/common/ucnv_err.cpp
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+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/japancal.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/listformatter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/measfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/measunit.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/measunit_extra.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/measure.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/msgfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/name2uni.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nfrs.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nfrule.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nfsubs.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nortrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nounit.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/nultrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_affixutils.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_asformat.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_capi.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_compact.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_currencysymbols.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_decimalquantity.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_decimfmtprops.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_fluent.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_formatimpl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_grouping.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_integerwidth.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_longnames.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_mapper.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_modifiers.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_multiplier.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_notation.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_output.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_padding.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_patternmodifier.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_patternstring.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_rounding.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_scientific.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_skeletons.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/number_utils.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_affixes.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_compositions.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_currency.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_decimal.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_impl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_parsednumber.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_scientific.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_symbols.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numparse_validators.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numrange_fluent.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numrange_impl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/numsys.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/olsontz.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/persncal.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/plurfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/plurrule.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/quant.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/quantityformatter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbnf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbt_data.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbt_pars.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbt_rule.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbt_set.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rbtz.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/regexcmp.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/regeximp.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/regexst.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/regextxt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/region.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/reldatefmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/reldtfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rematch.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/remtrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/repattrn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/rulebasedcollator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/scientificnumberformatter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/scriptset.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/search.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/selfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/sharedbreakiterator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/simpletz.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/smpdtfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/smpdtfst.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/sortkey.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/standardplural.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/string_segment.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/strmatch.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/strrepl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/stsearch.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/taiwncal.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/timezone.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/titletrn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tmunit.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tmutamt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tmutfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tolowtrn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/toupptrn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/translit.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/transreg.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tridpars.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tzfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tzgnames.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tznames.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tznames_impl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tzrule.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/tztrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucal.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucln_in.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucol.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucol_res.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucol_sit.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucoleitr.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ucsdet.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/udat.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/udateintervalformat.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/udatpg.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ufieldpositer.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uitercollationiterator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ulistformatter.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ulocdata.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/umsg.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/unesctrn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uni2name.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/unum.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/unumsys.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/upluralrules.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uregex.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uregexc.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uregion.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/usearch.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uspoof.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uspoof_build.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uspoof_conf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/uspoof_impl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/utf16collationiterator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/utf8collationiterator.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/utmscale.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/utrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/vtzone.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/vzone.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/windtfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/winnmfmt.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/wintzimpl.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/zonemeta.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/zrule.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/i18n/ztrans.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/locbund.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/sprintf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/sscanf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/ucln_io.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/ufile.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/ufmt_cmn.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/uprintf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/uprntf_p.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/uscanf.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/uscanf_p.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/ustdio.cpp
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/io/ustream.cpp
+)
+target_rodata_sources(contrib-libs-icu
+  PRIVATE
+  ${CMAKE_SOURCE_DIR}/contrib/libs/icu/icudt67_dat.rodata
+)
diff --git a/contrib/libs/libpq/src/include/port/darwin.h b/contrib/libs/libpq/src/include/port/darwin.h
new file mode 100644
index 00000000000..15fb69d6dbb
--- /dev/null
+++ b/contrib/libs/libpq/src/include/port/darwin.h
@@ -0,0 +1,8 @@
+/* src/include/port/darwin.h */
+
+#define __darwin__	1
+
+#if HAVE_DECL_F_FULLFSYNC		/* not present before macOS 10.3 */
+#define HAVE_FSYNC_WRITETHROUGH
+
+#endif
diff --git a/contrib/libs/libpq/src/include/port/linux.h b/contrib/libs/libpq/src/include/port/linux.h
new file mode 100644
index 00000000000..7a6e46cdbb7
--- /dev/null
+++ b/contrib/libs/libpq/src/include/port/linux.h
@@ -0,0 +1,22 @@
+/* src/include/port/linux.h */
+
+/*
+ * As of July 2007, all known versions of the Linux kernel will sometimes
+ * return EIDRM for a shmctl() operation when EINVAL is correct (it happens
+ * when the low-order 15 bits of the supplied shm ID match the slot number
+ * assigned to a newer shmem segment).  We deal with this by assuming that
+ * EIDRM means EINVAL in PGSharedMemoryIsInUse().  This is reasonably safe
+ * since in fact Linux has no excuse for ever returning EIDRM; it doesn't
+ * track removed segments in a way that would allow distinguishing them from
+ * private ones.  But someday that code might get upgraded, and we'd have
+ * to have a kernel version test here.
+ */
+#define HAVE_LINUX_EIDRM_BUG
+
+/*
+ * Set the default wal_sync_method to fdatasync.  With recent Linux versions,
+ * xlogdefs.h's normal rules will prefer open_datasync, which (a) doesn't
+ * perform better and (b) causes outright failures on ext4 data=journal
+ * filesystems, because those don't support O_DIRECT.
+ */
+#define PLATFORM_DEFAULT_SYNC_METHOD	SYNC_METHOD_FDATASYNC
diff --git a/contrib/libs/libpq/src/include/port/win32.h b/contrib/libs/libpq/src/include/port/win32.h
new file mode 100644
index 00000000000..e31861fc249
--- /dev/null
+++ b/contrib/libs/libpq/src/include/port/win32.h
@@ -0,0 +1,70 @@
+/* src/include/port/win32.h */
+#pragma once
+
+/*
+ * We always rely on the WIN32 macro being set by our build system,
+ * but _WIN32 is the compiler pre-defined macro. So make sure we define
+ * WIN32 whenever _WIN32 is set, to facilitate standalone building.
+ */
+#if defined(_WIN32) && !defined(WIN32)
+#define WIN32
+#endif
+
+/*
+ * Make sure _WIN32_WINNT has the minimum required value.
+ * Leave a higher value in place. When building with at least Visual
+ * Studio 2015 the minimum requirement is Windows Vista (0x0600) to
+ * get support for GetLocaleInfoEx() with locales. For everything else
+ * the minimum version is Windows XP (0x0501).
+ */
+#if defined(_MSC_VER) && _MSC_VER >= 1900
+#define MIN_WINNT 0x0600
+#else
+#define MIN_WINNT 0x0501
+#endif
+
+#if defined(_WIN32_WINNT) && _WIN32_WINNT < MIN_WINNT
+#undef _WIN32_WINNT
+#endif
+
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT MIN_WINNT
+#endif
+
+/*
+ * We need to prevent <crtdefs.h> from defining a symbol conflicting with
+ * our errcode() function.  Since it's likely to get included by standard
+ * system headers, pre-emptively include it now.
+ */
+#if defined(_MSC_VER) || defined(HAVE_CRTDEFS_H)
+#define errcode __msvc_errcode
+#include <crtdefs.h>
+#undef errcode
+#endif
+
+/*
+ * defines for dynamic linking on Win32 platform
+ */
+
+#ifdef BUILDING_DLL
+#define PGDLLIMPORT __declspec (dllexport)
+#else
+#define PGDLLIMPORT __declspec (dllimport)
+#endif
+
+#ifdef _MSC_VER
+#define PGDLLEXPORT __declspec (dllexport)
+#else
+#define PGDLLEXPORT
+#endif
+
+/*
+ * Windows headers don't define this structure, but you can define it yourself
+ * to use the functionality.
+ */
+struct sockaddr_un
+{
+	unsigned short sun_family;
+	char		sun_path[108];
+};
+#define HAVE_STRUCT_SOCKADDR_UN 1
diff --git a/contrib/libs/postgresql/src/backend/port/posix_sema.c b/contrib/libs/postgresql/src/backend/port/posix_sema.c
new file mode 100644
index 00000000000..114da3b30cb
--- /dev/null
+++ b/contrib/libs/postgresql/src/backend/port/posix_sema.c
@@ -0,0 +1,388 @@
+/*-------------------------------------------------------------------------
+ *
+ * posix_sema.c
+ *	  Implement PGSemaphores using POSIX semaphore facilities
+ *
+ * We prefer the unnamed style of POSIX semaphore (the kind made with
+ * sem_init).  We can cope with the kind made with sem_open, however.
+ *
+ * In either implementation, typedef PGSemaphore is equivalent to "sem_t *".
+ * With unnamed semaphores, the sem_t structs live in an array in shared
+ * memory.  With named semaphores, that's not true because we cannot persuade
+ * sem_open to do its allocation there.  Therefore, the named-semaphore code
+ * *does not cope with EXEC_BACKEND*.  The sem_t structs will just be in the
+ * postmaster's private memory, where they are successfully inherited by
+ * forked backends, but they could not be accessed by exec'd backends.
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/port/posix_sema.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <fcntl.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+#include "miscadmin.h"
+#include "storage/ipc.h"
+#include "storage/pg_sema.h"
+#include "storage/shmem.h"
+
+
+/* see file header comment */
+#if defined(USE_NAMED_POSIX_SEMAPHORES) && defined(EXEC_BACKEND)
+#error cannot use named POSIX semaphores with EXEC_BACKEND
+#endif
+
+typedef union SemTPadded
+{
+	sem_t		pgsem;
+	char		pad[PG_CACHE_LINE_SIZE];
+} SemTPadded;
+
+/* typedef PGSemaphore is equivalent to pointer to sem_t */
+typedef struct PGSemaphoreData
+{
+	SemTPadded	sem_padded;
+} PGSemaphoreData;
+
+#define PG_SEM_REF(x)	(&(x)->sem_padded.pgsem)
+
+#define IPCProtection	(0600)	/* access/modify by user only */
+
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+static sem_t **mySemPointers;	/* keep track of created semaphores */
+#else
+static PGSemaphore sharedSemas; /* array of PGSemaphoreData in shared memory */
+#endif
+static int	numSems;			/* number of semas acquired so far */
+static int	maxSems;			/* allocated size of above arrays */
+static int	nextSemKey;			/* next name to try */
+
+
+static void ReleaseSemaphores(int status, Datum arg);
+
+
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+
+/*
+ * PosixSemaphoreCreate
+ *
+ * Attempt to create a new named semaphore.
+ *
+ * If we fail with a failure code other than collision-with-existing-sema,
+ * print out an error and abort.  Other types of errors suggest nonrecoverable
+ * problems.
+ */
+static sem_t *
+PosixSemaphoreCreate(void)
+{
+	int			semKey;
+	char		semname[64];
+	sem_t	   *mySem;
+
+	for (;;)
+	{
+		semKey = nextSemKey++;
+
+		snprintf(semname, sizeof(semname), "/pgsql-%d", semKey);
+
+		mySem = sem_open(semname, O_CREAT | O_EXCL,
+						 (mode_t) IPCProtection, (unsigned) 1);
+
+#ifdef SEM_FAILED
+		if (mySem != (sem_t *) SEM_FAILED)
+			break;
+#else
+		if (mySem != (sem_t *) (-1))
+			break;
+#endif
+
+		/* Loop if error indicates a collision */
+		if (errno == EEXIST || errno == EACCES || errno == EINTR)
+			continue;
+
+		/*
+		 * Else complain and abort
+		 */
+		elog(FATAL, "sem_open(\"%s\") failed: %m", semname);
+	}
+
+	/*
+	 * Unlink the semaphore immediately, so it can't be accessed externally.
+	 * This also ensures that it will go away if we crash.
+	 */
+	sem_unlink(semname);
+
+	return mySem;
+}
+#else							/* !USE_NAMED_POSIX_SEMAPHORES */
+
+/*
+ * PosixSemaphoreCreate
+ *
+ * Attempt to create a new unnamed semaphore.
+ */
+static void
+PosixSemaphoreCreate(sem_t *sem)
+{
+	if (sem_init(sem, 1, 1) < 0)
+		elog(FATAL, "sem_init failed: %m");
+}
+#endif							/* USE_NAMED_POSIX_SEMAPHORES */
+
+
+/*
+ * PosixSemaphoreKill	- removes a semaphore
+ */
+static void
+PosixSemaphoreKill(sem_t *sem)
+{
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+	/* Got to use sem_close for named semaphores */
+	if (sem_close(sem) < 0)
+		elog(LOG, "sem_close failed: %m");
+#else
+	/* Got to use sem_destroy for unnamed semaphores */
+	if (sem_destroy(sem) < 0)
+		elog(LOG, "sem_destroy failed: %m");
+#endif
+}
+
+
+/*
+ * Report amount of shared memory needed for semaphores
+ */
+Size
+PGSemaphoreShmemSize(int maxSemas)
+{
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+	/* No shared memory needed in this case */
+	return 0;
+#else
+	/* Need a PGSemaphoreData per semaphore */
+	return mul_size(maxSemas, sizeof(PGSemaphoreData));
+#endif
+}
+
+/*
+ * PGReserveSemaphores --- initialize semaphore support
+ *
+ * This is called during postmaster start or shared memory reinitialization.
+ * It should do whatever is needed to be able to support up to maxSemas
+ * subsequent PGSemaphoreCreate calls.  Also, if any system resources
+ * are acquired here or in PGSemaphoreCreate, register an on_shmem_exit
+ * callback to release them.
+ *
+ * In the Posix implementation, we acquire semaphores on-demand; the
+ * maxSemas parameter is just used to size the arrays.  For unnamed
+ * semaphores, there is an array of PGSemaphoreData structs in shared memory.
+ * For named semaphores, we keep a postmaster-local array of sem_t pointers,
+ * which we use for releasing the semaphores when done.
+ * (This design minimizes the dependency of postmaster shutdown on the
+ * contents of shared memory, which a failed backend might have clobbered.
+ * We can't do much about the possibility of sem_destroy() crashing, but
+ * we don't have to expose the counters to other processes.)
+ */
+void
+PGReserveSemaphores(int maxSemas)
+{
+	struct stat statbuf;
+
+	/*
+	 * We use the data directory's inode number to seed the search for free
+	 * semaphore keys.  This minimizes the odds of collision with other
+	 * postmasters, while maximizing the odds that we will detect and clean up
+	 * semaphores left over from a crashed postmaster in our own directory.
+	 */
+	if (stat(DataDir, &statbuf) < 0)
+		ereport(FATAL,
+				(errcode_for_file_access(),
+				 errmsg("could not stat data directory \"%s\": %m",
+						DataDir)));
+
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+	mySemPointers = (sem_t **) malloc(maxSemas * sizeof(sem_t *));
+	if (mySemPointers == NULL)
+		elog(PANIC, "out of memory");
+#else
+
+	/*
+	 * We must use ShmemAllocUnlocked(), since the spinlock protecting
+	 * ShmemAlloc() won't be ready yet.  (This ordering is necessary when we
+	 * are emulating spinlocks with semaphores.)
+	 */
+	sharedSemas = (PGSemaphore)
+		ShmemAllocUnlocked(PGSemaphoreShmemSize(maxSemas));
+#endif
+
+	numSems = 0;
+	maxSems = maxSemas;
+	nextSemKey = statbuf.st_ino;
+
+	on_shmem_exit(ReleaseSemaphores, 0);
+}
+
+/*
+ * Release semaphores at shutdown or shmem reinitialization
+ *
+ * (called as an on_shmem_exit callback, hence funny argument list)
+ */
+static void
+ReleaseSemaphores(int status, Datum arg)
+{
+	int			i;
+
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+	for (i = 0; i < numSems; i++)
+		PosixSemaphoreKill(mySemPointers[i]);
+	free(mySemPointers);
+#endif
+
+#ifdef USE_UNNAMED_POSIX_SEMAPHORES
+	for (i = 0; i < numSems; i++)
+		PosixSemaphoreKill(PG_SEM_REF(sharedSemas + i));
+#endif
+}
+
+/*
+ * PGSemaphoreCreate
+ *
+ * Allocate a PGSemaphore structure with initial count 1
+ */
+PGSemaphore
+PGSemaphoreCreate(void)
+{
+	PGSemaphore sema;
+	sem_t	   *newsem;
+
+	/* Can't do this in a backend, because static state is postmaster's */
+	Assert(!IsUnderPostmaster);
+
+	if (numSems >= maxSems)
+		elog(PANIC, "too many semaphores created");
+
+#ifdef USE_NAMED_POSIX_SEMAPHORES
+	newsem = PosixSemaphoreCreate();
+	/* Remember new sema for ReleaseSemaphores */
+	mySemPointers[numSems] = newsem;
+	sema = (PGSemaphore) newsem;
+#else
+	sema = &sharedSemas[numSems];
+	newsem = PG_SEM_REF(sema);
+	PosixSemaphoreCreate(newsem);
+#endif
+
+	numSems++;
+
+	return sema;
+}
+
+/*
+ * PGSemaphoreReset
+ *
+ * Reset a previously-initialized PGSemaphore to have count 0
+ */
+void
+PGSemaphoreReset(PGSemaphore sema)
+{
+	/*
+	 * There's no direct API for this in POSIX, so we have to ratchet the
+	 * semaphore down to 0 with repeated trywait's.
+	 */
+	for (;;)
+	{
+		if (sem_trywait(PG_SEM_REF(sema)) < 0)
+		{
+			if (errno == EAGAIN || errno == EDEADLK)
+				break;			/* got it down to 0 */
+			if (errno == EINTR)
+				continue;		/* can this happen? */
+			elog(FATAL, "sem_trywait failed: %m");
+		}
+	}
+}
+
+/*
+ * PGSemaphoreLock
+ *
+ * Lock a semaphore (decrement count), blocking if count would be < 0
+ */
+void
+PGSemaphoreLock(PGSemaphore sema)
+{
+	int			errStatus;
+
+	/* See notes in sysv_sema.c's implementation of PGSemaphoreLock. */
+	do
+	{
+		errStatus = sem_wait(PG_SEM_REF(sema));
+	} while (errStatus < 0 && errno == EINTR);
+
+	if (errStatus < 0)
+		elog(FATAL, "sem_wait failed: %m");
+}
+
+/*
+ * PGSemaphoreUnlock
+ *
+ * Unlock a semaphore (increment count)
+ */
+void
+PGSemaphoreUnlock(PGSemaphore sema)
+{
+	int			errStatus;
+
+	/*
+	 * Note: if errStatus is -1 and errno == EINTR then it means we returned
+	 * from the operation prematurely because we were sent a signal.  So we
+	 * try and unlock the semaphore again. Not clear this can really happen,
+	 * but might as well cope.
+	 */
+	do
+	{
+		errStatus = sem_post(PG_SEM_REF(sema));
+	} while (errStatus < 0 && errno == EINTR);
+
+	if (errStatus < 0)
+		elog(FATAL, "sem_post failed: %m");
+}
+
+/*
+ * PGSemaphoreTryLock
+ *
+ * Lock a semaphore only if able to do so without blocking
+ */
+bool
+PGSemaphoreTryLock(PGSemaphore sema)
+{
+	int			errStatus;
+
+	/*
+	 * Note: if errStatus is -1 and errno == EINTR then it means we returned
+	 * from the operation prematurely because we were sent a signal.  So we
+	 * try and lock the semaphore again.
+	 */
+	do
+	{
+		errStatus = sem_trywait(PG_SEM_REF(sema));
+	} while (errStatus < 0 && errno == EINTR);
+
+	if (errStatus < 0)
+	{
+		if (errno == EAGAIN || errno == EDEADLK)
+			return false;		/* failed to lock it */
+		/* Otherwise we got trouble */
+		elog(FATAL, "sem_trywait failed: %m");
+	}
+
+	return true;
+}
diff --git a/contrib/libs/postgresql/src/backend/port/sysv_shmem.c b/contrib/libs/postgresql/src/backend/port/sysv_shmem.c
new file mode 100644
index 00000000000..35cce89e9c9
--- /dev/null
+++ b/contrib/libs/postgresql/src/backend/port/sysv_shmem.c
@@ -0,0 +1,946 @@
+/*-------------------------------------------------------------------------
+ *
+ * sysv_shmem.c
+ *	  Implement shared memory using SysV facilities
+ *
+ * These routines used to be a fairly thin layer on top of SysV shared
+ * memory functionality.  With the addition of anonymous-shmem logic,
+ * they're a bit fatter now.  We still require a SysV shmem block to
+ * exist, though, because mmap'd shmem provides no way to find out how
+ * many processes are attached, which we need for interlocking purposes.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/port/sysv_shmem.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include <signal.h>
+#include <unistd.h>
+#include <sys/file.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#ifdef HAVE_SYS_IPC_H
+#include <sys/ipc.h>
+#endif
+#ifdef HAVE_SYS_SHM_H
+#include <sys/shm.h>
+#endif
+
+#include "miscadmin.h"
+#include "port/pg_bitutils.h"
+#include "portability/mem.h"
+#include "storage/dsm.h"
+#include "storage/fd.h"
+#include "storage/ipc.h"
+#include "storage/pg_shmem.h"
+#include "utils/guc.h"
+#include "utils/pidfile.h"
+
+
+/*
+ * As of PostgreSQL 9.3, we normally allocate only a very small amount of
+ * System V shared memory, and only for the purposes of providing an
+ * interlock to protect the data directory.  The real shared memory block
+ * is allocated using mmap().  This works around the problem that many
+ * systems have very low limits on the amount of System V shared memory
+ * that can be allocated.  Even a limit of a few megabytes will be enough
+ * to run many copies of PostgreSQL without needing to adjust system settings.
+ *
+ * We assume that no one will attempt to run PostgreSQL 9.3 or later on
+ * systems that are ancient enough that anonymous shared memory is not
+ * supported, such as pre-2.4 versions of Linux.  If that turns out to be
+ * false, we might need to add compile and/or run-time tests here and do this
+ * only if the running kernel supports it.
+ *
+ * However, we must always disable this logic in the EXEC_BACKEND case, and
+ * fall back to the old method of allocating the entire segment using System V
+ * shared memory, because there's no way to attach an anonymous mmap'd segment
+ * to a process after exec().  Since EXEC_BACKEND is intended only for
+ * developer use, this shouldn't be a big problem.  Because of this, we do
+ * not worry about supporting anonymous shmem in the EXEC_BACKEND cases below.
+ *
+ * As of PostgreSQL 12, we regained the ability to use a large System V shared
+ * memory region even in non-EXEC_BACKEND builds, if shared_memory_type is set
+ * to sysv (though this is not the default).
+ */
+
+
+typedef key_t IpcMemoryKey;		/* shared memory key passed to shmget(2) */
+typedef int IpcMemoryId;		/* shared memory ID returned by shmget(2) */
+
+/*
+ * How does a given IpcMemoryId relate to this PostgreSQL process?
+ *
+ * One could recycle unattached segments of different data directories if we
+ * distinguished that case from other SHMSTATE_FOREIGN cases.  Doing so would
+ * cause us to visit less of the key space, making us less likely to detect a
+ * SHMSTATE_ATTACHED key.  It would also complicate the concurrency analysis,
+ * in that postmasters of different data directories could simultaneously
+ * attempt to recycle a given key.  We'll waste keys longer in some cases, but
+ * avoiding the problems of the alternative justifies that loss.
+ */
+typedef enum
+{
+	SHMSTATE_ANALYSIS_FAILURE,	/* unexpected failure to analyze the ID */
+	SHMSTATE_ATTACHED,			/* pertinent to DataDir, has attached PIDs */
+	SHMSTATE_ENOENT,			/* no segment of that ID */
+	SHMSTATE_FOREIGN,			/* exists, but not pertinent to DataDir */
+	SHMSTATE_UNATTACHED			/* pertinent to DataDir, no attached PIDs */
+} IpcMemoryState;
+
+
+unsigned long UsedShmemSegID = 0;
+void	   *UsedShmemSegAddr = NULL;
+
+static Size AnonymousShmemSize;
+static void *AnonymousShmem = NULL;
+
+static void *InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size);
+static void IpcMemoryDetach(int status, Datum shmaddr);
+static void IpcMemoryDelete(int status, Datum shmId);
+static IpcMemoryState PGSharedMemoryAttach(IpcMemoryId shmId,
+										   void *attachAt,
+										   PGShmemHeader **addr);
+
+
+/*
+ *	InternalIpcMemoryCreate(memKey, size)
+ *
+ * Attempt to create a new shared memory segment with the specified key.
+ * Will fail (return NULL) if such a segment already exists.  If successful,
+ * attach the segment to the current process and return its attached address.
+ * On success, callbacks are registered with on_shmem_exit to detach and
+ * delete the segment when on_shmem_exit is called.
+ *
+ * If we fail with a failure code other than collision-with-existing-segment,
+ * print out an error and abort.  Other types of errors are not recoverable.
+ */
+static void *
+InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size)
+{
+	IpcMemoryId shmid;
+	void	   *requestedAddress = NULL;
+	void	   *memAddress;
+
+	/*
+	 * Normally we just pass requestedAddress = NULL to shmat(), allowing the
+	 * system to choose where the segment gets mapped.  But in an EXEC_BACKEND
+	 * build, it's possible for whatever is chosen in the postmaster to not
+	 * work for backends, due to variations in address space layout.  As a
+	 * rather klugy workaround, allow the user to specify the address to use
+	 * via setting the environment variable PG_SHMEM_ADDR.  (If this were of
+	 * interest for anything except debugging, we'd probably create a cleaner
+	 * and better-documented way to set it, such as a GUC.)
+	 */
+#ifdef EXEC_BACKEND
+	{
+		char	   *pg_shmem_addr = getenv("PG_SHMEM_ADDR");
+
+		if (pg_shmem_addr)
+			requestedAddress = (void *) strtoul(pg_shmem_addr, NULL, 0);
+		else
+		{
+#if defined(__darwin__) && SIZEOF_VOID_P == 8
+			/*
+			 * Provide a default value that is believed to avoid problems with
+			 * ASLR on the current macOS release.
+			 */
+			requestedAddress = (void *) 0x80000000000;
+#endif
+		}
+	}
+#endif
+
+	shmid = shmget(memKey, size, IPC_CREAT | IPC_EXCL | IPCProtection);
+
+	if (shmid < 0)
+	{
+		int			shmget_errno = errno;
+
+		/*
+		 * Fail quietly if error indicates a collision with existing segment.
+		 * One would expect EEXIST, given that we said IPC_EXCL, but perhaps
+		 * we could get a permission violation instead?  Also, EIDRM might
+		 * occur if an old seg is slated for destruction but not gone yet.
+		 */
+		if (shmget_errno == EEXIST || shmget_errno == EACCES
+#ifdef EIDRM
+			|| shmget_errno == EIDRM
+#endif
+			)
+			return NULL;
+
+		/*
+		 * Some BSD-derived kernels are known to return EINVAL, not EEXIST, if
+		 * there is an existing segment but it's smaller than "size" (this is
+		 * a result of poorly-thought-out ordering of error tests). To
+		 * distinguish between collision and invalid size in such cases, we
+		 * make a second try with size = 0.  These kernels do not test size
+		 * against SHMMIN in the preexisting-segment case, so we will not get
+		 * EINVAL a second time if there is such a segment.
+		 */
+		if (shmget_errno == EINVAL)
+		{
+			shmid = shmget(memKey, 0, IPC_CREAT | IPC_EXCL | IPCProtection);
+
+			if (shmid < 0)
+			{
+				/* As above, fail quietly if we verify a collision */
+				if (errno == EEXIST || errno == EACCES
+#ifdef EIDRM
+					|| errno == EIDRM
+#endif
+					)
+					return NULL;
+				/* Otherwise, fall through to report the original error */
+			}
+			else
+			{
+				/*
+				 * On most platforms we cannot get here because SHMMIN is
+				 * greater than zero.  However, if we do succeed in creating a
+				 * zero-size segment, free it and then fall through to report
+				 * the original error.
+				 */
+				if (shmctl(shmid, IPC_RMID, NULL) < 0)
+					elog(LOG, "shmctl(%d, %d, 0) failed: %m",
+						 (int) shmid, IPC_RMID);
+			}
+		}
+
+		/*
+		 * Else complain and abort.
+		 *
+		 * Note: at this point EINVAL should mean that either SHMMIN or SHMMAX
+		 * is violated.  SHMALL violation might be reported as either ENOMEM
+		 * (BSDen) or ENOSPC (Linux); the Single Unix Spec fails to say which
+		 * it should be.  SHMMNI violation is ENOSPC, per spec.  Just plain
+		 * not-enough-RAM is ENOMEM.
+		 */
+		errno = shmget_errno;
+		ereport(FATAL,
+				(errmsg("could not create shared memory segment: %m"),
+				 errdetail("Failed system call was shmget(key=%lu, size=%zu, 0%o).",
+						   (unsigned long) memKey, size,
+						   IPC_CREAT | IPC_EXCL | IPCProtection),
+				 (shmget_errno == EINVAL) ?
+				 errhint("This error usually means that PostgreSQL's request for a shared memory "
+						 "segment exceeded your kernel's SHMMAX parameter, or possibly that "
+						 "it is less than "
+						 "your kernel's SHMMIN parameter.\n"
+						 "The PostgreSQL documentation contains more information about shared "
+						 "memory configuration.") : 0,
+				 (shmget_errno == ENOMEM) ?
+				 errhint("This error usually means that PostgreSQL's request for a shared "
+						 "memory segment exceeded your kernel's SHMALL parameter.  You might need "
+						 "to reconfigure the kernel with larger SHMALL.\n"
+						 "The PostgreSQL documentation contains more information about shared "
+						 "memory configuration.") : 0,
+				 (shmget_errno == ENOSPC) ?
+				 errhint("This error does *not* mean that you have run out of disk space.  "
+						 "It occurs either if all available shared memory IDs have been taken, "
+						 "in which case you need to raise the SHMMNI parameter in your kernel, "
+						 "or because the system's overall limit for shared memory has been "
+						 "reached.\n"
+						 "The PostgreSQL documentation contains more information about shared "
+						 "memory configuration.") : 0));
+	}
+
+	/* Register on-exit routine to delete the new segment */
+	on_shmem_exit(IpcMemoryDelete, Int32GetDatum(shmid));
+
+	/* OK, should be able to attach to the segment */
+	memAddress = shmat(shmid, requestedAddress, PG_SHMAT_FLAGS);
+
+	if (memAddress == (void *) -1)
+		elog(FATAL, "shmat(id=%d, addr=%p, flags=0x%x) failed: %m",
+			 shmid, requestedAddress, PG_SHMAT_FLAGS);
+
+	/* Register on-exit routine to detach new segment before deleting */
+	on_shmem_exit(IpcMemoryDetach, PointerGetDatum(memAddress));
+
+	/*
+	 * Store shmem key and ID in data directory lockfile.  Format to try to
+	 * keep it the same length always (trailing junk in the lockfile won't
+	 * hurt, but might confuse humans).
+	 */
+	{
+		char		line[64];
+
+		sprintf(line, "%9lu %9lu",
+				(unsigned long) memKey, (unsigned long) shmid);
+		AddToDataDirLockFile(LOCK_FILE_LINE_SHMEM_KEY, line);
+	}
+
+	return memAddress;
+}
+
+/****************************************************************************/
+/*	IpcMemoryDetach(status, shmaddr)	removes a shared memory segment		*/
+/*										from process' address space			*/
+/*	(called as an on_shmem_exit callback, hence funny argument list)		*/
+/****************************************************************************/
+static void
+IpcMemoryDetach(int status, Datum shmaddr)
+{
+	/* Detach System V shared memory block. */
+	if (shmdt(DatumGetPointer(shmaddr)) < 0)
+		elog(LOG, "shmdt(%p) failed: %m", DatumGetPointer(shmaddr));
+}
+
+/****************************************************************************/
+/*	IpcMemoryDelete(status, shmId)		deletes a shared memory segment		*/
+/*	(called as an on_shmem_exit callback, hence funny argument list)		*/
+/****************************************************************************/
+static void
+IpcMemoryDelete(int status, Datum shmId)
+{
+	if (shmctl(DatumGetInt32(shmId), IPC_RMID, NULL) < 0)
+		elog(LOG, "shmctl(%d, %d, 0) failed: %m",
+			 DatumGetInt32(shmId), IPC_RMID);
+}
+
+/*
+ * PGSharedMemoryIsInUse
+ *
+ * Is a previously-existing shmem segment still existing and in use?
+ *
+ * The point of this exercise is to detect the case where a prior postmaster
+ * crashed, but it left child backends that are still running.  Therefore
+ * we only care about shmem segments that are associated with the intended
+ * DataDir.  This is an important consideration since accidental matches of
+ * shmem segment IDs are reasonably common.
+ */
+bool
+PGSharedMemoryIsInUse(unsigned long id1, unsigned long id2)
+{
+	PGShmemHeader *memAddress;
+	IpcMemoryState state;
+
+	state = PGSharedMemoryAttach((IpcMemoryId) id2, NULL, &memAddress);
+	if (memAddress && shmdt(memAddress) < 0)
+		elog(LOG, "shmdt(%p) failed: %m", memAddress);
+	switch (state)
+	{
+		case SHMSTATE_ENOENT:
+		case SHMSTATE_FOREIGN:
+		case SHMSTATE_UNATTACHED:
+			return false;
+		case SHMSTATE_ANALYSIS_FAILURE:
+		case SHMSTATE_ATTACHED:
+			return true;
+	}
+	return true;
+}
+
+/*
+ * Test for a segment with id shmId; see comment at IpcMemoryState.
+ *
+ * If the segment exists, we'll attempt to attach to it, using attachAt
+ * if that's not NULL (but it's best to pass NULL if possible).
+ *
+ * *addr is set to the segment memory address if we attached to it, else NULL.
+ */
+static IpcMemoryState
+PGSharedMemoryAttach(IpcMemoryId shmId,
+					 void *attachAt,
+					 PGShmemHeader **addr)
+{
+	struct shmid_ds shmStat;
+	struct stat statbuf;
+	PGShmemHeader *hdr;
+
+	*addr = NULL;
+
+	/*
+	 * First, try to stat the shm segment ID, to see if it exists at all.
+	 */
+	if (shmctl(shmId, IPC_STAT, &shmStat) < 0)
+	{
+		/*
+		 * EINVAL actually has multiple possible causes documented in the
+		 * shmctl man page, but we assume it must mean the segment no longer
+		 * exists.
+		 */
+		if (errno == EINVAL)
+			return SHMSTATE_ENOENT;
+
+		/*
+		 * EACCES implies we have no read permission, which means it is not a
+		 * Postgres shmem segment (or at least, not one that is relevant to
+		 * our data directory).
+		 */
+		if (errno == EACCES)
+			return SHMSTATE_FOREIGN;
+
+		/*
+		 * Some Linux kernel versions (in fact, all of them as of July 2007)
+		 * sometimes return EIDRM when EINVAL is correct.  The Linux kernel
+		 * actually does not have any internal state that would justify
+		 * returning EIDRM, so we can get away with assuming that EIDRM is
+		 * equivalent to EINVAL on that platform.
+		 */
+#ifdef HAVE_LINUX_EIDRM_BUG
+		if (errno == EIDRM)
+			return SHMSTATE_ENOENT;
+#endif
+
+		/*
+		 * Otherwise, we had better assume that the segment is in use.  The
+		 * only likely case is (non-Linux, assumed spec-compliant) EIDRM,
+		 * which implies that the segment has been IPC_RMID'd but there are
+		 * still processes attached to it.
+		 */
+		return SHMSTATE_ANALYSIS_FAILURE;
+	}
+
+	/*
+	 * Try to attach to the segment and see if it matches our data directory.
+	 * This avoids any risk of duplicate-shmem-key conflicts on machines that
+	 * are running several postmasters under the same userid.
+	 *
+	 * (When we're called from PGSharedMemoryCreate, this stat call is
+	 * duplicative; but since this isn't a high-traffic case it's not worth
+	 * trying to optimize.)
+	 */
+	if (stat(DataDir, &statbuf) < 0)
+		return SHMSTATE_ANALYSIS_FAILURE;	/* can't stat; be conservative */
+
+	hdr = (PGShmemHeader *) shmat(shmId, attachAt, PG_SHMAT_FLAGS);
+	if (hdr == (PGShmemHeader *) -1)
+	{
+		/*
+		 * Attachment failed.  The cases we're interested in are the same as
+		 * for the shmctl() call above.  In particular, note that the owning
+		 * postmaster could have terminated and removed the segment between
+		 * shmctl() and shmat().
+		 *
+		 * If attachAt isn't NULL, it's possible that EINVAL reflects a
+		 * problem with that address not a vanished segment, so it's best to
+		 * pass NULL when probing for conflicting segments.
+		 */
+		if (errno == EINVAL)
+			return SHMSTATE_ENOENT; /* segment disappeared */
+		if (errno == EACCES)
+			return SHMSTATE_FOREIGN;	/* must be non-Postgres */
+#ifdef HAVE_LINUX_EIDRM_BUG
+		if (errno == EIDRM)
+			return SHMSTATE_ENOENT; /* segment disappeared */
+#endif
+		/* Otherwise, be conservative. */
+		return SHMSTATE_ANALYSIS_FAILURE;
+	}
+	*addr = hdr;
+
+	if (hdr->magic != PGShmemMagic ||
+		hdr->device != statbuf.st_dev ||
+		hdr->inode != statbuf.st_ino)
+	{
+		/*
+		 * It's either not a Postgres segment, or not one for my data
+		 * directory.
+		 */
+		return SHMSTATE_FOREIGN;
+	}
+
+	/*
+	 * It does match our data directory, so now test whether any processes are
+	 * still attached to it.  (We are, now, but the shm_nattch result is from
+	 * before we attached to it.)
+	 */
+	return shmStat.shm_nattch == 0 ? SHMSTATE_UNATTACHED : SHMSTATE_ATTACHED;
+}
+
+#ifdef MAP_HUGETLB
+
+/*
+ * Identify the huge page size to use, and compute the related mmap flags.
+ *
+ * Some Linux kernel versions have a bug causing mmap() to fail on requests
+ * that are not a multiple of the hugepage size.  Versions without that bug
+ * instead silently round the request up to the next hugepage multiple ---
+ * and then munmap() fails when we give it a size different from that.
+ * So we have to round our request up to a multiple of the actual hugepage
+ * size to avoid trouble.
+ *
+ * Doing the round-up ourselves also lets us make use of the extra memory,
+ * rather than just wasting it.  Currently, we just increase the available
+ * space recorded in the shmem header, which will make the extra usable for
+ * purposes such as additional locktable entries.  Someday, for very large
+ * hugepage sizes, we might want to think about more invasive strategies,
+ * such as increasing shared_buffers to absorb the extra space.
+ *
+ * Returns the (real, assumed or config provided) page size into *hugepagesize,
+ * and the hugepage-related mmap flags to use into *mmap_flags.
+ */
+static void
+GetHugePageSize(Size *hugepagesize, int *mmap_flags)
+{
+	Size		default_hugepagesize = 0;
+
+	/*
+	 * System-dependent code to find out the default huge page size.
+	 *
+	 * On Linux, read /proc/meminfo looking for a line like "Hugepagesize:
+	 * nnnn kB".  Ignore any failures, falling back to the preset default.
+	 */
+#ifdef __linux__
+
+	{
+		FILE	   *fp = AllocateFile("/proc/meminfo", "r");
+		char		buf[128];
+		unsigned int sz;
+		char		ch;
+
+		if (fp)
+		{
+			while (fgets(buf, sizeof(buf), fp))
+			{
+				if (sscanf(buf, "Hugepagesize: %u %c", &sz, &ch) == 2)
+				{
+					if (ch == 'k')
+					{
+						default_hugepagesize = sz * (Size) 1024;
+						break;
+					}
+					/* We could accept other units besides kB, if needed */
+				}
+			}
+			FreeFile(fp);
+		}
+	}
+#endif							/* __linux__ */
+
+	if (huge_page_size != 0)
+	{
+		/* If huge page size is requested explicitly, use that. */
+		*hugepagesize = (Size) huge_page_size * 1024;
+	}
+	else if (default_hugepagesize != 0)
+	{
+		/* Otherwise use the system default, if we have it. */
+		*hugepagesize = default_hugepagesize;
+	}
+	else
+	{
+		/*
+		 * If we fail to find out the system's default huge page size, or no
+		 * huge page size is requested explicitly, assume it is 2MB. This will
+		 * work fine when the actual size is less.  If it's more, we might get
+		 * mmap() or munmap() failures due to unaligned requests; but at this
+		 * writing, there are no reports of any non-Linux systems being picky
+		 * about that.
+		 */
+		*hugepagesize = 2 * 1024 * 1024;
+	}
+
+	*mmap_flags = MAP_HUGETLB;
+
+	/*
+	 * On recent enough Linux, also include the explicit page size, if
+	 * necessary.
+	 */
+#if defined(MAP_HUGE_MASK) && defined(MAP_HUGE_SHIFT)
+	if (*hugepagesize != default_hugepagesize)
+	{
+		int			shift = pg_ceil_log2_64(*hugepagesize);
+
+		*mmap_flags |= (shift & MAP_HUGE_MASK) << MAP_HUGE_SHIFT;
+	}
+#endif
+}
+
+#endif							/* MAP_HUGETLB */
+
+/*
+ * Creates an anonymous mmap()ed shared memory segment.
+ *
+ * Pass the requested size in *size.  This function will modify *size to the
+ * actual size of the allocation, if it ends up allocating a segment that is
+ * larger than requested.
+ */
+static void *
+CreateAnonymousSegment(Size *size)
+{
+	Size		allocsize = *size;
+	void	   *ptr = MAP_FAILED;
+	int			mmap_errno = 0;
+
+#ifndef MAP_HUGETLB
+	/* PGSharedMemoryCreate should have dealt with this case */
+	Assert(huge_pages != HUGE_PAGES_ON);
+#else
+	if (huge_pages == HUGE_PAGES_ON || huge_pages == HUGE_PAGES_TRY)
+	{
+		/*
+		 * Round up the request size to a suitable large value.
+		 */
+		Size		hugepagesize;
+		int			mmap_flags;
+
+		GetHugePageSize(&hugepagesize, &mmap_flags);
+
+		if (allocsize % hugepagesize != 0)
+			allocsize += hugepagesize - (allocsize % hugepagesize);
+
+		ptr = mmap(NULL, allocsize, PROT_READ | PROT_WRITE,
+				   PG_MMAP_FLAGS | mmap_flags, -1, 0);
+		mmap_errno = errno;
+		if (huge_pages == HUGE_PAGES_TRY && ptr == MAP_FAILED)
+			elog(DEBUG1, "mmap(%zu) with MAP_HUGETLB failed, huge pages disabled: %m",
+				 allocsize);
+	}
+#endif
+
+	if (ptr == MAP_FAILED && huge_pages != HUGE_PAGES_ON)
+	{
+		/*
+		 * Use the original size, not the rounded-up value, when falling back
+		 * to non-huge pages.
+		 */
+		allocsize = *size;
+		ptr = mmap(NULL, allocsize, PROT_READ | PROT_WRITE,
+				   PG_MMAP_FLAGS, -1, 0);
+		mmap_errno = errno;
+	}
+
+	if (ptr == MAP_FAILED)
+	{
+		errno = mmap_errno;
+		ereport(FATAL,
+				(errmsg("could not map anonymous shared memory: %m"),
+				 (mmap_errno == ENOMEM) ?
+				 errhint("This error usually means that PostgreSQL's request "
+						 "for a shared memory segment exceeded available memory, "
+						 "swap space, or huge pages. To reduce the request size "
+						 "(currently %zu bytes), reduce PostgreSQL's shared "
+						 "memory usage, perhaps by reducing shared_buffers or "
+						 "max_connections.",
+						 allocsize) : 0));
+	}
+
+	*size = allocsize;
+	return ptr;
+}
+
+/*
+ * AnonymousShmemDetach --- detach from an anonymous mmap'd block
+ * (called as an on_shmem_exit callback, hence funny argument list)
+ */
+static void
+AnonymousShmemDetach(int status, Datum arg)
+{
+	/* Release anonymous shared memory block, if any. */
+	if (AnonymousShmem != NULL)
+	{
+		if (munmap(AnonymousShmem, AnonymousShmemSize) < 0)
+			elog(LOG, "munmap(%p, %zu) failed: %m",
+				 AnonymousShmem, AnonymousShmemSize);
+		AnonymousShmem = NULL;
+	}
+}
+
+/*
+ * PGSharedMemoryCreate
+ *
+ * Create a shared memory segment of the given size and initialize its
+ * standard header.  Also, register an on_shmem_exit callback to release
+ * the storage.
+ *
+ * Dead Postgres segments pertinent to this DataDir are recycled if found, but
+ * we do not fail upon collision with foreign shmem segments.  The idea here
+ * is to detect and re-use keys that may have been assigned by a crashed
+ * postmaster or backend.
+ */
+PGShmemHeader *
+PGSharedMemoryCreate(Size size,
+					 PGShmemHeader **shim)
+{
+	IpcMemoryKey NextShmemSegID;
+	void	   *memAddress;
+	PGShmemHeader *hdr;
+	struct stat statbuf;
+	Size		sysvsize;
+
+	/*
+	 * We use the data directory's ID info (inode and device numbers) to
+	 * positively identify shmem segments associated with this data dir, and
+	 * also as seeds for searching for a free shmem key.
+	 */
+	if (stat(DataDir, &statbuf) < 0)
+		ereport(FATAL,
+				(errcode_for_file_access(),
+				 errmsg("could not stat data directory \"%s\": %m",
+						DataDir)));
+
+	/* Complain if hugepages demanded but we can't possibly support them */
+#if !defined(MAP_HUGETLB)
+	if (huge_pages == HUGE_PAGES_ON)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("huge pages not supported on this platform")));
+#endif
+
+	/* For now, we don't support huge pages in SysV memory */
+	if (huge_pages == HUGE_PAGES_ON && shared_memory_type != SHMEM_TYPE_MMAP)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("huge pages not supported with the current shared_memory_type setting")));
+
+	/* Room for a header? */
+	Assert(size > MAXALIGN(sizeof(PGShmemHeader)));
+
+	if (shared_memory_type == SHMEM_TYPE_MMAP)
+	{
+		AnonymousShmem = CreateAnonymousSegment(&size);
+		AnonymousShmemSize = size;
+
+		/* Register on-exit routine to unmap the anonymous segment */
+		on_shmem_exit(AnonymousShmemDetach, (Datum) 0);
+
+		/* Now we need only allocate a minimal-sized SysV shmem block. */
+		sysvsize = sizeof(PGShmemHeader);
+	}
+	else
+		sysvsize = size;
+
+	/*
+	 * Loop till we find a free IPC key.  Trust CreateDataDirLockFile() to
+	 * ensure no more than one postmaster per data directory can enter this
+	 * loop simultaneously.  (CreateDataDirLockFile() does not entirely ensure
+	 * that, but prefer fixing it over coping here.)
+	 */
+	NextShmemSegID = statbuf.st_ino;
+
+	for (;;)
+	{
+		IpcMemoryId shmid;
+		PGShmemHeader *oldhdr;
+		IpcMemoryState state;
+
+		/* Try to create new segment */
+		memAddress = InternalIpcMemoryCreate(NextShmemSegID, sysvsize);
+		if (memAddress)
+			break;				/* successful create and attach */
+
+		/* Check shared memory and possibly remove and recreate */
+
+		/*
+		 * shmget() failure is typically EACCES, hence SHMSTATE_FOREIGN.
+		 * ENOENT, a narrow possibility, implies SHMSTATE_ENOENT, but one can
+		 * safely treat SHMSTATE_ENOENT like SHMSTATE_FOREIGN.
+		 */
+		shmid = shmget(NextShmemSegID, sizeof(PGShmemHeader), 0);
+		if (shmid < 0)
+		{
+			oldhdr = NULL;
+			state = SHMSTATE_FOREIGN;
+		}
+		else
+			state = PGSharedMemoryAttach(shmid, NULL, &oldhdr);
+
+		switch (state)
+		{
+			case SHMSTATE_ANALYSIS_FAILURE:
+			case SHMSTATE_ATTACHED:
+				ereport(FATAL,
+						(errcode(ERRCODE_LOCK_FILE_EXISTS),
+						 errmsg("pre-existing shared memory block (key %lu, ID %lu) is still in use",
+								(unsigned long) NextShmemSegID,
+								(unsigned long) shmid),
+						 errhint("Terminate any old server processes associated with data directory \"%s\".",
+								 DataDir)));
+				break;
+			case SHMSTATE_ENOENT:
+
+				/*
+				 * To our surprise, some other process deleted since our last
+				 * InternalIpcMemoryCreate().  Moments earlier, we would have
+				 * seen SHMSTATE_FOREIGN.  Try that same ID again.
+				 */
+				elog(LOG,
+					 "shared memory block (key %lu, ID %lu) deleted during startup",
+					 (unsigned long) NextShmemSegID,
+					 (unsigned long) shmid);
+				break;
+			case SHMSTATE_FOREIGN:
+				NextShmemSegID++;
+				break;
+			case SHMSTATE_UNATTACHED:
+
+				/*
+				 * The segment pertains to DataDir, and every process that had
+				 * used it has died or detached.  Zap it, if possible, and any
+				 * associated dynamic shared memory segments, as well.  This
+				 * shouldn't fail, but if it does, assume the segment belongs
+				 * to someone else after all, and try the next candidate.
+				 * Otherwise, try again to create the segment.  That may fail
+				 * if some other process creates the same shmem key before we
+				 * do, in which case we'll try the next key.
+				 */
+				if (oldhdr->dsm_control != 0)
+					dsm_cleanup_using_control_segment(oldhdr->dsm_control);
+				if (shmctl(shmid, IPC_RMID, NULL) < 0)
+					NextShmemSegID++;
+				break;
+		}
+
+		if (oldhdr && shmdt(oldhdr) < 0)
+			elog(LOG, "shmdt(%p) failed: %m", oldhdr);
+	}
+
+	/* Initialize new segment. */
+	hdr = (PGShmemHeader *) memAddress;
+	hdr->creatorPID = getpid();
+	hdr->magic = PGShmemMagic;
+	hdr->dsm_control = 0;
+
+	/* Fill in the data directory ID info, too */
+	hdr->device = statbuf.st_dev;
+	hdr->inode = statbuf.st_ino;
+
+	/*
+	 * Initialize space allocation status for segment.
+	 */
+	hdr->totalsize = size;
+	hdr->freeoffset = MAXALIGN(sizeof(PGShmemHeader));
+	*shim = hdr;
+
+	/* Save info for possible future use */
+	UsedShmemSegAddr = memAddress;
+	UsedShmemSegID = (unsigned long) NextShmemSegID;
+
+	/*
+	 * If AnonymousShmem is NULL here, then we're not using anonymous shared
+	 * memory, and should return a pointer to the System V shared memory
+	 * block. Otherwise, the System V shared memory block is only a shim, and
+	 * we must return a pointer to the real block.
+	 */
+	if (AnonymousShmem == NULL)
+		return hdr;
+	memcpy(AnonymousShmem, hdr, sizeof(PGShmemHeader));
+	return (PGShmemHeader *) AnonymousShmem;
+}
+
+#ifdef EXEC_BACKEND
+
+/*
+ * PGSharedMemoryReAttach
+ *
+ * This is called during startup of a postmaster child process to re-attach to
+ * an already existing shared memory segment.  This is needed only in the
+ * EXEC_BACKEND case; otherwise postmaster children inherit the shared memory
+ * segment attachment via fork().
+ *
+ * UsedShmemSegID and UsedShmemSegAddr are implicit parameters to this
+ * routine.  The caller must have already restored them to the postmaster's
+ * values.
+ */
+void
+PGSharedMemoryReAttach(void)
+{
+	IpcMemoryId shmid;
+	PGShmemHeader *hdr;
+	IpcMemoryState state;
+	void	   *origUsedShmemSegAddr = UsedShmemSegAddr;
+
+	Assert(UsedShmemSegAddr != NULL);
+	Assert(IsUnderPostmaster);
+
+#ifdef __CYGWIN__
+	/* cygipc (currently) appears to not detach on exec. */
+	PGSharedMemoryDetach();
+	UsedShmemSegAddr = origUsedShmemSegAddr;
+#endif
+
+	elog(DEBUG3, "attaching to %p", UsedShmemSegAddr);
+	shmid = shmget(UsedShmemSegID, sizeof(PGShmemHeader), 0);
+	if (shmid < 0)
+		state = SHMSTATE_FOREIGN;
+	else
+		state = PGSharedMemoryAttach(shmid, UsedShmemSegAddr, &hdr);
+	if (state != SHMSTATE_ATTACHED)
+		elog(FATAL, "could not reattach to shared memory (key=%d, addr=%p): %m",
+			 (int) UsedShmemSegID, UsedShmemSegAddr);
+	if (hdr != origUsedShmemSegAddr)
+		elog(FATAL, "reattaching to shared memory returned unexpected address (got %p, expected %p)",
+			 hdr, origUsedShmemSegAddr);
+	dsm_set_control_handle(hdr->dsm_control);
+
+	UsedShmemSegAddr = hdr;		/* probably redundant */
+}
+
+/*
+ * PGSharedMemoryNoReAttach
+ *
+ * This is called during startup of a postmaster child process when we choose
+ * *not* to re-attach to the existing shared memory segment.  We must clean up
+ * to leave things in the appropriate state.  This is not used in the non
+ * EXEC_BACKEND case, either.
+ *
+ * The child process startup logic might or might not call PGSharedMemoryDetach
+ * after this; make sure that it will be a no-op if called.
+ *
+ * UsedShmemSegID and UsedShmemSegAddr are implicit parameters to this
+ * routine.  The caller must have already restored them to the postmaster's
+ * values.
+ */
+void
+PGSharedMemoryNoReAttach(void)
+{
+	Assert(UsedShmemSegAddr != NULL);
+	Assert(IsUnderPostmaster);
+
+#ifdef __CYGWIN__
+	/* cygipc (currently) appears to not detach on exec. */
+	PGSharedMemoryDetach();
+#endif
+
+	/* For cleanliness, reset UsedShmemSegAddr to show we're not attached. */
+	UsedShmemSegAddr = NULL;
+	/* And the same for UsedShmemSegID. */
+	UsedShmemSegID = 0;
+}
+
+#endif							/* EXEC_BACKEND */
+
+/*
+ * PGSharedMemoryDetach
+ *
+ * Detach from the shared memory segment, if still attached.  This is not
+ * intended to be called explicitly by the process that originally created the
+ * segment (it will have on_shmem_exit callback(s) registered to do that).
+ * Rather, this is for subprocesses that have inherited an attachment and want
+ * to get rid of it.
+ *
+ * UsedShmemSegID and UsedShmemSegAddr are implicit parameters to this
+ * routine, also AnonymousShmem and AnonymousShmemSize.
+ */
+void
+PGSharedMemoryDetach(void)
+{
+	if (UsedShmemSegAddr != NULL)
+	{
+		if ((shmdt(UsedShmemSegAddr) < 0)
+#if defined(EXEC_BACKEND) && defined(__CYGWIN__)
+		/* Work-around for cygipc exec bug */
+			&& shmdt(NULL) < 0
+#endif
+			)
+			elog(LOG, "shmdt(%p) failed: %m", UsedShmemSegAddr);
+		UsedShmemSegAddr = NULL;
+	}
+
+	if (AnonymousShmem != NULL)
+	{
+		if (munmap(AnonymousShmem, AnonymousShmemSize) < 0)
+			elog(LOG, "munmap(%p, %zu) failed: %m",
+				 AnonymousShmem, AnonymousShmemSize);
+		AnonymousShmem = NULL;
+	}
+}