Remove replacement code for getaddrinfo.

SUSv3, all targeted Unixes and modern Windows have getaddrinfo() and
related interfaces.  Drop the replacement implementation, and adjust
some headers slightly to make sure that the APIs are visible everywhere
using standard POSIX headers and names.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2BL_3brvh%3D8e0BW_VfX9h7MtwgN%3DnFHP5o7X2oZucY9dg%40mail.gmail.com

Author: macdice

config/c-library.m4

@@ -89,17 +89,6 @@ AC_DEFUN([PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS],
 ])])# PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS
 
 
-# PGAC_STRUCT_ADDRINFO
-# -----------------------
-# If `struct addrinfo' exists, define HAVE_STRUCT_ADDRINFO.
-AC_DEFUN([PGAC_STRUCT_ADDRINFO],
-[AC_CHECK_TYPES([struct addrinfo], [], [],
-[#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
-])])# PGAC_STRUCT_ADDRINFO
-
-
 # PGAC_TYPE_LOCALE_T
 # ------------------
 # Check for the locale_t type and find the right header file.  macOS

configure

@@ -15119,20 +15119,6 @@ cat >>confdefs.h <<_ACEOF
 _ACEOF
 
 
-fi
-
-ac_fn_c_check_type "$LINENO" "struct addrinfo" "ac_cv_type_struct_addrinfo" "#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
-
-"
-if test "x$ac_cv_type_struct_addrinfo" = xyes; then :
-
-cat >>confdefs.h <<_ACEOF
-#define HAVE_STRUCT_ADDRINFO 1
-_ACEOF
-
-
 fi
 
 
@@ -16533,34 +16519,6 @@ esac
 $as_echo "$as_me: On $host_os we will use our strtof wrapper." >&6;}
 fi
 
-# System's version of getaddrinfo(), if any, may be used only if we found
-# a definition for struct addrinfo; see notes in src/include/getaddrinfo.h.
-# We use only our own getaddrinfo.c on Windows, but it's time to revisit that.
-if test x"$ac_cv_type_struct_addrinfo" = xyes && \
-   test "$PORTNAME" != "win32"; then
-  ac_fn_c_check_func "$LINENO" "getaddrinfo" "ac_cv_func_getaddrinfo"
-if test "x$ac_cv_func_getaddrinfo" = xyes; then :
-  $as_echo "#define HAVE_GETADDRINFO 1" >>confdefs.h
-
-else
-  case " $LIBOBJS " in
-  *" getaddrinfo.$ac_objext "* ) ;;
-  *) LIBOBJS="$LIBOBJS getaddrinfo.$ac_objext"
- ;;
-esac
-
-fi
-
-
-else
-  case " $LIBOBJS " in
-  *" getaddrinfo.$ac_objext "* ) ;;
-  *) LIBOBJS="$LIBOBJS getaddrinfo.$ac_objext"
- ;;
-esac
-
-fi
-
 # Similarly, use system's getopt_long() only if system provides struct option.
 if test x"$ac_cv_type_struct_option" = xyes ; then
   ac_fn_c_check_func "$LINENO" "getopt_long" "ac_cv_func_getopt_long"

configure.ac

@@ -1619,7 +1619,6 @@ PGAC_STRUCT_TIMEZONE
 PGAC_UNION_SEMUN
 AC_CHECK_TYPES(socklen_t, [], [], [#include <sys/socket.h>])
 PGAC_STRUCT_SOCKADDR_STORAGE_MEMBERS
-PGAC_STRUCT_ADDRINFO
 
 PGAC_TYPE_LOCALE_T
 
@@ -1849,16 +1848,6 @@ if test "$PORTNAME" = "win32" -o "$PORTNAME" = "cygwin"; then
 	AC_MSG_NOTICE([On $host_os we will use our strtof wrapper.])
 fi
 
-# System's version of getaddrinfo(), if any, may be used only if we found
-# a definition for struct addrinfo; see notes in src/include/getaddrinfo.h.
-# We use only our own getaddrinfo.c on Windows, but it's time to revisit that.
-if test x"$ac_cv_type_struct_addrinfo" = xyes && \
-   test "$PORTNAME" != "win32"; then
-  AC_REPLACE_FUNCS([getaddrinfo])
-else
-  AC_LIBOBJ(getaddrinfo)
-fi
-
 # Similarly, use system's getopt_long() only if system provides struct option.
 if test x"$ac_cv_type_struct_option" = xyes ; then
   AC_REPLACE_FUNCS([getopt_long])

src/backend/libpq/auth.c

@@ -19,6 +19,7 @@
 #include <sys/select.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
+#include <netdb.h>
 #include <pwd.h>
 #include <unistd.h>
 

src/backend/libpq/hba.c

@@ -21,6 +21,7 @@
 #include <fcntl.h>
 #include <sys/param.h>
 #include <sys/socket.h>
+#include <netdb.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <unistd.h>

src/bin/initdb/initdb.c

@@ -50,6 +50,8 @@
 
 #include <dirent.h>
 #include <fcntl.h>
+#include <netdb.h>
+#include <sys/socket.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <signal.h>
@@ -72,7 +74,6 @@
 #include "common/string.h"
 #include "common/username.h"
 #include "fe_utils/string_utils.h"
-#include "getaddrinfo.h"
 #include "getopt_long.h"
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"

src/include/common/ip.h

@@ -14,7 +14,9 @@
 #ifndef IP_H
 #define IP_H
 
-#include "getaddrinfo.h"		/* pgrminclude ignore */
+#include <netdb.h>
+#include <sys/socket.h>
+
 #include "libpq/pqcomm.h"		/* pgrminclude ignore */
 
 

src/include/getaddrinfo.h

@@ -33,14 +33,6 @@
 #else
 #include <gssapi/gssapi.h>
 #endif							/* HAVE_GSSAPI_H */
-/*
- * GSSAPI brings in headers that set a lot of things in the global namespace on win32,
- * that doesn't match the msvc build. It gives a bunch of compiler warnings that we ignore,
- * but also defines a symbol that simply does not exist. Undefine it again.
- */
-#ifdef _MSC_VER
-#undef HAVE_GETADDRINFO
-#endif
 #endif							/* ENABLE_GSS */
 
 #ifdef ENABLE_SSPI

src/include/libpq/libpq-be.h

@@ -178,9 +178,6 @@
    */
 #undef HAVE_GCC__SYNC_INT64_CAS
 
-/* Define to 1 if you have the `getaddrinfo' function. */
-#undef HAVE_GETADDRINFO
-
 /* Define to 1 if you have the `gethostbyname_r' function. */
 #undef HAVE_GETHOSTBYNAME_R
 
@@ -448,9 +445,6 @@
 /* Define to 1 if you have the `strsignal' function. */
 #undef HAVE_STRSIGNAL
 
-/* Define to 1 if the system has the type `struct addrinfo'. */
-#undef HAVE_STRUCT_ADDRINFO
-
 /* Define to 1 if the system has the type `struct cmsgcred'. */
 #undef HAVE_STRUCT_CMSGCRED
 

src/include/pg_config.h.in

@@ -1 +1,9 @@
 /* src/include/port/win32/netdb.h */
+#ifndef WIN32_NETDB_H
+#define WIN32_NETDB_H
+
+#include <ws2tcpip.h>
+
+#define gai_strerror gai_strerrorA
+
+#endif

src/include/port/win32/netdb.h

@@ -12,9 +12,11 @@
 #ifndef _WALRECEIVER_H
 #define _WALRECEIVER_H
 
+#include <netdb.h>
+#include <sys/socket.h>
+
 #include "access/xlog.h"
 #include "access/xlogdefs.h"
-#include "getaddrinfo.h"		/* for NI_MAXHOST */
 #include "pgtime.h"
 #include "port/atomics.h"
 #include "replication/logicalproto.h"

src/include/replication/walreceiver.h

@@ -18,6 +18,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <ctype.h>
+#include <netdb.h>
 #include <time.h>
 #include <unistd.h>
 

src/interfaces/libpq/fe-connect.c

@@ -23,6 +23,8 @@
 /* We assume libpq-fe.h has already been included. */
 #include "libpq-events.h"
 
+#include <netdb.h>
+#include <sys/socket.h>
 #include <time.h>
 #ifndef WIN32
 #include <sys/time.h>
@@ -38,7 +40,6 @@
 #endif
 
 /* include stuff common to fe and be */
-#include "getaddrinfo.h"
 #include "libpq/pqcomm.h"
 /* include stuff found in fe only */
 #include "fe-auth-sasl.h"

src/interfaces/libpq/libpq-int.h

@@ -84,10 +84,6 @@ libpgport.a: $(OBJS)
 	rm -f $@
 	$(AR) $(AROPT) $@ $^
 
-# getaddrinfo.o and getaddrinfo_shlib.o need PTHREAD_CFLAGS (but getaddrinfo_srv.o does not)
-getaddrinfo.o: CFLAGS+=$(PTHREAD_CFLAGS)
-getaddrinfo_shlib.o: CFLAGS+=$(PTHREAD_CFLAGS)
-
 # thread.o and thread_shlib.o need PTHREAD_CFLAGS (but thread_srv.o does not)
 thread.o: CFLAGS+=$(PTHREAD_CFLAGS)
 thread_shlib.o: CFLAGS+=$(PTHREAD_CFLAGS)