diff --git a/newlib/libc/include/pwd.h b/newlib/libc/include/pwd.h
index baae88410..45d1594ea 100644
--- a/newlib/libc/include/pwd.h
+++ b/newlib/libc/include/pwd.h
@@ -55,10 +55,10 @@ struct passwd {
 	char	*pw_shell;		/* default shell */
 };
 
-#ifndef __INSIDE_CYGWIN__
 struct passwd	*getpwuid (uid_t);
 struct passwd	*getpwnam (const char *);
 
+#ifndef __INSIDE_CYGWIN__
 #if __MISC_VISIBLE || __POSIX_VISIBLE
 int 		 getpwnam_r (const char *, struct passwd *,
 			char *, size_t , struct passwd **);
diff --git a/newlib/libc/include/sys/stat.h b/newlib/libc/include/sys/stat.h
index 6525272dd..98f5addb4 100644
--- a/newlib/libc/include/sys/stat.h
+++ b/newlib/libc/include/sys/stat.h
@@ -142,7 +142,7 @@ int	mkfifo (const char *__path, mode_t __mode );
 int	stat (const char *__restrict __path, struct stat *__restrict __sbuf );
 mode_t	umask (mode_t __mask );
 
-#if defined (__SPU__) || defined(__rtems__) || defined(__CYGWIN__) && !defined(__INSIDE_CYGWIN__)
+#if defined (__SPU__) || defined(__rtems__) || defined(__CYGWIN__)
 int	lstat (const char *__restrict __path, struct stat *__restrict __buf );
 int	mknod (const char *__path, mode_t __mode, dev_t __dev );
 #endif
diff --git a/newlib/libc/include/sys/unistd.h b/newlib/libc/include/sys/unistd.h
index 3cc313080..216d779d8 100644
--- a/newlib/libc/include/sys/unistd.h
+++ b/newlib/libc/include/sys/unistd.h
@@ -21,9 +21,7 @@ int	access (const char *__path, int __amode);
 unsigned  alarm (unsigned __secs);
 int     chdir (const char *__path);
 int     chmod (const char *__path, mode_t __mode);
-#if !defined(__INSIDE_CYGWIN__)
 int     chown (const char *__path, uid_t __owner, gid_t __group);
-#endif
 #if __BSD_VISIBLE || (__XSI_VISIBLE >= 4 && __POSIX_VISIBLE < 200112)
 int     chroot (const char *__path);
 #endif
@@ -79,11 +77,9 @@ int     fchdir (int __fildes);
 #if __POSIX_VISIBLE >= 199309
 int     fchmod (int __fildes, mode_t __mode);
 #endif
-#if !defined(__INSIDE_CYGWIN__)
 #if __BSD_VISIBLE || __XSI_VISIBLE >= 4 || __POSIX_VISIBLE >= 200809
 int     fchown (int __fildes, uid_t __owner, gid_t __group);
 #endif
-#endif
 #if __ATFILE_VISIBLE
 int	fchownat (int __dirfd, const char *__path, uid_t __owner, gid_t __group, int __flags);
 #endif
@@ -106,11 +102,9 @@ int	getdomainname  (char *__name, size_t __len);
 #if __BSD_VISIBLE
 int     getentropy (void *, size_t);
 #endif
-#if !defined(__INSIDE_CYGWIN__)
 gid_t   getegid (void);
 uid_t   geteuid (void);
 gid_t   getgid (void);
-#endif
 int     getgroups (int __gidsetsize, gid_t __grouplist[]);
 #if __BSD_VISIBLE || __XSI_VISIBLE >= 4
 long    gethostid (void);
@@ -135,9 +129,7 @@ pid_t   getppid (void);
 #if __POSIX_VISIBLE >= 200809 || __XSI_VISIBLE >= 4
 pid_t   getsid (pid_t);
 #endif
-#if !defined(__INSIDE_CYGWIN__)
 uid_t   getuid (void);
-#endif
 #if __BSD_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 500)
 char *	getusershell (void);
 #endif
@@ -151,11 +143,9 @@ int     isatty (int __fildes);
 #if __BSD_VISIBLE
 int        issetugid (void);
 #endif
-#if !defined(__INSIDE_CYGWIN__)
 #if __BSD_VISIBLE || __XSI_VISIBLE >= 4 || __POSIX_VISIBLE >= 200809
 int     lchown (const char *__path, uid_t __owner, gid_t __group);
 #endif
-#endif
 int     link (const char *__path1, const char *__path2);
 #if __ATFILE_VISIBLE
 int     linkat (int __dirfd1, const char *__path1, int __dirfd2, const char *__path2, int __flags);
@@ -198,13 +188,11 @@ int	ruserok (const char *rhost, int superuser, const char *ruser, const char *lu
 #if __BSD_VISIBLE || (__XSI_VISIBLE >= 4 && __POSIX_VISIBLE < 200112)
 void *  sbrk (ptrdiff_t __incr);
 #endif
-#if !defined(__INSIDE_CYGWIN__)
 #if __BSD_VISIBLE || __POSIX_VISIBLE >= 200112
 int     setegid (gid_t __gid);
 int     seteuid (uid_t __uid);
 #endif
 int     setgid (gid_t __gid);
-#endif
 #if __BSD_VISIBLE
 int	setgroups (int ngroups, const gid_t *grouplist);
 #endif
@@ -215,14 +203,12 @@ int     setpgid (pid_t __pid, pid_t __pgid);
 #if __SVID_VISIBLE || __XSI_VISIBLE >= 500
 int     setpgrp (void);
 #endif
-#if (__BSD_VISIBLE || __XSI_VISIBLE >= 4) && !defined(__INSIDE_CYGWIN__)
+#if __BSD_VISIBLE || __XSI_VISIBLE >= 4
 int	setregid (gid_t __rgid, gid_t __egid);
 int	setreuid (uid_t __ruid, uid_t __euid);
 #endif
 pid_t   setsid (void);
-#if !defined(__INSIDE_CYGWIN__)
 int     setuid (uid_t __uid);
-#endif
 #if __BSD_VISIBLE || (__XSI_VISIBLE && __XSI_VISIBLE < 500)
 void	setusershell (void);
 #endif
diff --git a/newlib/libc/posix/posix_spawn.c b/newlib/libc/posix/posix_spawn.c
index fe912a8b7..85bfa6477 100644
--- a/newlib/libc/posix/posix_spawn.c
+++ b/newlib/libc/posix/posix_spawn.c
@@ -146,17 +146,6 @@ typedef struct __posix_spawn_file_actions_entry {
  * Spawn routines
  */
 
-#if defined (__CYGWIN__) && defined (__i386__)
-extern int getgid32 (void);
-extern int getuid32 (void);
-extern int setegid32 (gid_t egid);
-extern int seteuid32 (uid_t euid);
-#define setegid setegid32
-#define seteuid seteuid32
-#define getgid getgid32
-#define getuid getuid32
-#endif
-
 static int
 process_spawnattr(const posix_spawnattr_t sa)
 {
diff --git a/winsup/cygwin/cygheap.h b/winsup/cygwin/cygheap.h
index a47d9819e..0bca8995b 100644
--- a/winsup/cygwin/cygheap.h
+++ b/winsup/cygwin/cygheap.h
@@ -102,7 +102,7 @@ public:
   user_groups groups;   /* Primary and supp SIDs */
 
   HANDLE external_token;	 /* token from set_impersonation_token call */
-  HANDLE internal_token;	 /* password-less token fetched in seteuid32 */
+  HANDLE internal_token;	 /* password-less token fetched in seteuid */
   HANDLE curr_primary_token;	 /* Just a copy of external or internal token */
   HANDLE curr_imp_token;	 /* impersonation token derived from primary
 				    token */
diff --git a/winsup/cygwin/cygmalloc.h b/winsup/cygwin/cygmalloc.h
index 36f56294f..a6033c166 100644
--- a/winsup/cygwin/cygmalloc.h
+++ b/winsup/cygwin/cygmalloc.h
@@ -29,8 +29,6 @@ void dlmalloc_stats ();
 #if defined (DLMALLOC_VERSION)	/* Building malloc.cc */
 
 extern "C" void __set_ENOMEM ();
-void *mmap64 (void *, size_t, int, int, int, off_t);
-# define mmap mmap64
 # define MALLOC_FAILURE_ACTION	__set_ENOMEM ()
 # define USE_DL_PREFIX 1
 
diff --git a/winsup/cygwin/cygserver_ipc.h b/winsup/cygwin/cygserver_ipc.h
index 05029aff7..2938e1a73 100644
--- a/winsup/cygwin/cygserver_ipc.h
+++ b/winsup/cygwin/cygserver_ipc.h
@@ -36,8 +36,8 @@ ipc_set_proc_info (proc &blk, bool in_fork = false)
 {
   blk.cygpid = getpid ();
   blk.winpid = GetCurrentProcessId ();
-  blk.uid = geteuid32 ();
-  blk.gid = getegid32 ();
+  blk.uid = geteuid ();
+  blk.gid = getegid ();
   blk.gidcnt = 0;
   blk.gidlist = NULL;
   blk.is_admin = false;
diff --git a/winsup/cygwin/fcntl.cc b/winsup/cygwin/fcntl.cc
index 437fcf128..2bc52edb0 100644
--- a/winsup/cygwin/fcntl.cc
+++ b/winsup/cygwin/fcntl.cc
@@ -17,7 +17,7 @@ details. */
 #include "cygtls.h"
 
 extern "C" int
-fcntl64 (int fd, int cmd, ...)
+fcntl (int fd, int cmd, ...)
 {
   int res = -1;
   intptr_t arg = 0;
@@ -79,5 +79,4 @@ fcntl64 (int fd, int cmd, ...)
   return res;
 }
 
-EXPORT_ALIAS (fcntl64, fcntl)
-EXPORT_ALIAS (fcntl64, _fcntl)
+EXPORT_ALIAS (fcntl, _fcntl)
diff --git a/winsup/cygwin/fhandler.cc b/winsup/cygwin/fhandler.cc
index fc7bf0a0e..4fce0120a 100644
--- a/winsup/cygwin/fhandler.cc
+++ b/winsup/cygwin/fhandler.cc
@@ -1272,8 +1272,8 @@ fhandler_base::fstat (struct stat *buf)
       break;
     }
 
-  buf->st_uid = geteuid32 ();
-  buf->st_gid = getegid32 ();
+  buf->st_uid = geteuid ();
+  buf->st_gid = getegid ();
   buf->st_nlink = 1;
   buf->st_blksize = PREFERRED_IO_BLKSIZE;
 
diff --git a/winsup/cygwin/fhandler_clipboard.cc b/winsup/cygwin/fhandler_clipboard.cc
index 14820701c..e2814d1c7 100644
--- a/winsup/cygwin/fhandler_clipboard.cc
+++ b/winsup/cygwin/fhandler_clipboard.cc
@@ -18,6 +18,7 @@ details. */
 #include "cygheap.h"
 #include "child_info.h"
 #include <sys/clipboard.h>
+#include <unistd.h>
 
 /*
  * Robert Collins:
@@ -159,8 +160,8 @@ int __reg2
 fhandler_dev_clipboard::fstat (struct stat *buf)
 {
   buf->st_mode = S_IFCHR | STD_RBITS | STD_WBITS | S_IWGRP | S_IWOTH;
-  buf->st_uid = geteuid32 ();
-  buf->st_gid = getegid32 ();
+  buf->st_uid = geteuid ();
+  buf->st_gid = getegid ();
   buf->st_nlink = 1;
   buf->st_blksize = PREFERRED_IO_BLKSIZE;
 
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index 3cec1ed84..38bdb365b 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -1013,7 +1013,7 @@ cant_access_acl:
       switch (cmd)
 	{
 	  case SETACL:
-	    if (!aclsort32 (nentries, 0, aclbufp))
+	    if (!aclsort (nentries, 0, aclbufp))
 	      {
 		bool rw = false;
 		res = setacl (get_handle (), pc, nentries, aclbufp, rw);
diff --git a/winsup/cygwin/fhandler_process.cc b/winsup/cygwin/fhandler_process.cc
index e2dd1286f..482dd176f 100644
--- a/winsup/cygwin/fhandler_process.cc
+++ b/winsup/cygwin/fhandler_process.cc
@@ -1049,7 +1049,7 @@ peb_teb_rinse_repeat:
 		  if (mount_table->conv_to_posix_path (dosname,
 						       posix_modname, 0))
 		    sys_wcstombs (posix_modname, NT_MAX_PATH, dosname);
-		  stat64 (posix_modname, &st);
+		  stat (posix_modname, &st);
 		}
 	      else if (!threads.fill_if_match (cur.abase, mb.Type,
 					       posix_modname)
diff --git a/winsup/cygwin/fhandler_raw.cc b/winsup/cygwin/fhandler_raw.cc
index 8d3314465..536d752b5 100644
--- a/winsup/cygwin/fhandler_raw.cc
+++ b/winsup/cygwin/fhandler_raw.cc
@@ -47,8 +47,8 @@ fhandler_dev_raw::fstat (struct stat *buf)
 
       if (get_major () == DEV_SD_HIGHPART_END && get_minor () == 9999)
 	buf->st_ino = get_ino ();
-      buf->st_uid = geteuid32 ();
-      buf->st_gid = getegid32 ();
+      buf->st_uid = geteuid ();
+      buf->st_gid = getegid ();
       buf->st_nlink = 1;
       buf->st_blksize = PREFERRED_IO_BLKSIZE;
       time_as_timestruc_t (&buf->st_ctim);
diff --git a/winsup/cygwin/fhandler_socket_local.cc b/winsup/cygwin/fhandler_socket_local.cc
index bd4081622..c7870733a 100644
--- a/winsup/cygwin/fhandler_socket_local.cc
+++ b/winsup/cygwin/fhandler_socket_local.cc
@@ -395,8 +395,8 @@ void
 fhandler_socket_local::af_local_set_sockpair_cred ()
 {
   sec_pid = sec_peer_pid = getpid ();
-  sec_uid = sec_peer_uid = geteuid32 ();
-  sec_gid = sec_peer_gid = getegid32 ();
+  sec_uid = sec_peer_uid = geteuid ();
+  sec_gid = sec_peer_gid = getegid ();
 }
 
 void
@@ -592,8 +592,8 @@ void
 fhandler_socket_local::af_local_set_cred ()
 {
   sec_pid = getpid ();
-  sec_uid = geteuid32 ();
-  sec_gid = getegid32 ();
+  sec_uid = geteuid ();
+  sec_gid = getegid ();
   sec_peer_pid = (pid_t) 0;
   sec_peer_uid = (uid_t) -1;
   sec_peer_gid = (gid_t) -1;
diff --git a/winsup/cygwin/fhandler_tty.cc b/winsup/cygwin/fhandler_tty.cc
index 825d80666..b8427dc8c 100644
--- a/winsup/cygwin/fhandler_tty.cc
+++ b/winsup/cygwin/fhandler_tty.cc
@@ -1818,7 +1818,7 @@ fhandler_pty_slave::facl (int cmd, int nentries, aclent_t *aclbufp)
   switch (cmd)
     {
       case SETACL:
-	if (!aclsort32 (nentries, 0, aclbufp))
+	if (!aclsort (nentries, 0, aclbufp))
 	  set_errno (ENOTSUP);
 	break;
       case GETACL:
diff --git a/winsup/cygwin/glob.cc b/winsup/cygwin/glob.cc
index b14cf6dab..0d9f9c885 100644
--- a/winsup/cygwin/glob.cc
+++ b/winsup/cygwin/glob.cc
@@ -101,9 +101,6 @@ __FBSDID("$FreeBSD: src/lib/libc/gen/glob.c,v 1.28 2010/05/12 17:44:00 gordon Ex
 #include "cygheap.h"
 #include "cygwin/version.h"
 
-#define getpwuid(uid)	getpwuid32 (uid)
-#define getuid()	getuid32 ()
-
 #define CCHAR(c)	(ignore_case_with_glob ? towlower (CHAR (c)) : CHAR (c))
 #define Cchar(c)	(ignore_case_with_glob ? towlower (c) : (c))
 #endif
@@ -868,7 +865,7 @@ g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 	}
 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 		return CYGWIN_gl_stat (gl_lstat);
-	return(lstat64(buf, sb));
+	return(lstat(buf, sb));
 }
 
 static int
@@ -882,7 +879,7 @@ g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 	}
 	if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 		return CYGWIN_gl_stat (gl_stat);
-	return(stat64(buf, sb));
+	return(stat(buf, sb));
 }
 
 static const Char *
diff --git a/winsup/cygwin/grp.cc b/winsup/cygwin/grp.cc
index 893e4cc0f..b06ad3791 100644
--- a/winsup/cygwin/grp.cc
+++ b/winsup/cygwin/grp.cc
@@ -300,15 +300,13 @@ getgr_cp (struct group *tempgr)
 }
 
 extern "C" struct group *
-getgrgid32 (gid_t gid)
+getgrgid (gid_t gid)
 {
   struct group *tempgr = internal_getgrgid (gid);
   pthread_testcancel ();
   return getgr_cp (tempgr);
 }
 
-EXPORT_ALIAS (getgrgid32, getgrgid)
-
 extern "C" int
 getgrnam_r (const char *nam, struct group *grp, char *buffer,
 	    size_t bufsize, struct group **result)
@@ -340,15 +338,13 @@ getgrnam_r (const char *nam, struct group *grp, char *buffer,
 }
 
 extern "C" struct group *
-getgrnam32 (const char *name)
+getgrnam (const char *name)
 {
   struct group *tempgr = internal_getgrnam (name);
   pthread_testcancel ();
   return getgr_cp (tempgr);
 }
 
-EXPORT_ALIAS (getgrnam32, getgrnam)
-
 /* getgrent functions are not reentrant. */
 static gr_ent grent;
 
@@ -459,13 +455,11 @@ setgrent ()
 }
 
 extern "C" struct group *
-getgrent32 (void)
+getgrent (void)
 {
   return grent.getgrent ();
 }
 
-EXPORT_ALIAS (getgrent32, getgrent)
-
 extern "C" void
 endgrent (void)
 {
@@ -646,15 +640,13 @@ out:
 }
 
 extern "C" int
-getgroups32 (int gidsetsize, gid_t *grouplist)
+getgroups (int gidsetsize, gid_t *grouplist)
 {
   cyg_ldap cldap;
 
   return internal_getgroups (gidsetsize, grouplist, &cldap);
 }
 
-EXPORT_ALIAS (getgroups32, getgroups)
-
 /* Core functionality of initgroups and getgrouplist. */
 static void
 get_groups (const char *user, gid_t gid, cygsidlist &gsids)
@@ -673,7 +665,7 @@ get_groups (const char *user, gid_t gid, cygsidlist &gsids)
 }
 
 extern "C" int
-initgroups32 (const char *user, gid_t gid)
+initgroups (const char *user, gid_t gid)
 {
   assert (user != NULL);
   cygsidlist tmp_gsids (cygsidlist_auto, 12);
@@ -687,8 +679,6 @@ initgroups32 (const char *user, gid_t gid)
   return 0;
 }
 
-EXPORT_ALIAS (initgroups32, initgroups)
-
 extern "C" int
 getgrouplist (const char *user, gid_t gid, gid_t *groups, int *ngroups)
 {
@@ -725,11 +715,11 @@ getgrouplist (const char *user, gid_t gid, gid_t *groups, int *ngroups)
   return ret;
 }
 
-/* setgroups32: standards? */
+/* setgroups: standards? */
 extern "C" int
-setgroups32 (int ngroups, const gid_t *grouplist)
+setgroups (int ngroups, const gid_t *grouplist)
 {
-  syscall_printf ("setgroups32 (%d)", ngroups);
+  syscall_printf ("setgroups (%d)", ngroups);
   if (ngroups < 0 || (ngroups > 0 && !grouplist))
     {
       set_errno (EINVAL);
@@ -756,5 +746,3 @@ setgroups32 (int ngroups, const gid_t *grouplist)
   cygheap->user.groups.update_supp (gsids);
   return 0;
 }
-
-EXPORT_ALIAS (setgroups32, setgroups)
diff --git a/winsup/cygwin/include/cygwin/acl.h b/winsup/cygwin/include/cygwin/acl.h
index 7b803134a..0e61bed69 100644
--- a/winsup/cygwin/include/cygwin/acl.h
+++ b/winsup/cygwin/include/cygwin/acl.h
@@ -70,7 +70,6 @@ typedef struct acl {
     mode_t       a_perm;    /* permissions */
 } aclent_t;
 
-#ifndef __INSIDE_CYGWIN__
 extern int	 acl (const char *__path, int __cmd, int __nentries,
 		      aclent_t *__aclbufp);
 extern int	 facl (int __fd, int __cmd, int __nentries,
@@ -87,7 +86,6 @@ extern int	 aclfrompbits (aclent_t *__aclbufp, int __nentries,
 			       mode_t *__pbitsp);
 extern char	*acltotext (aclent_t *__aclbufp, int __aclcnt);
 extern aclent_t *aclfromtext (char *__acltextp, int *__aclcnt);
-#endif
 
 #ifdef __cplusplus
 }
diff --git a/winsup/cygwin/include/cygwin/grp.h b/winsup/cygwin/include/cygwin/grp.h
index ea253e936..a40d4d66a 100644
--- a/winsup/cygwin/include/cygwin/grp.h
+++ b/winsup/cygwin/include/cygwin/grp.h
@@ -16,13 +16,6 @@ details. */
 extern "C" {
 #endif
 
-#ifdef __INSIDE_CYGWIN__
-struct group * getgrgid32 (gid_t gid);
-struct group * getgrnam32 (const char *name);
-gid_t getgid32 ();
-gid_t getegid32 ();
-#endif
-
 extern int getgrouplist (const char *, gid_t, gid_t *, int *);
 
 #ifdef __cplusplus
diff --git a/winsup/cygwin/include/cygwin/stat.h b/winsup/cygwin/include/cygwin/stat.h
index b890f61a1..7f1b61681 100644
--- a/winsup/cygwin/include/cygwin/stat.h
+++ b/winsup/cygwin/include/cygwin/stat.h
@@ -32,16 +32,6 @@ struct stat
   timestruc_t   st_birthtim;
 };
 
-#if defined (__INSIDE_CYGWIN__) || defined (_LIBC)
-
-extern int fstat64 (int fd, struct stat *buf);
-extern int stat64 (const char *__restrict file_name,
-		   struct stat *__restrict buf);
-extern int lstat64 (const char *__restrict file_name,
-		    struct stat *__restrict buf);
-
-#endif
-
 #define st_atime st_atim.tv_sec
 #define st_mtime st_mtim.tv_sec
 #define st_ctime st_ctim.tv_sec
diff --git a/winsup/cygwin/include/sys/mman.h b/winsup/cygwin/include/sys/mman.h
index 35fa9e9d2..4bdd6caea 100644
--- a/winsup/cygwin/include/sys/mman.h
+++ b/winsup/cygwin/include/sys/mman.h
@@ -74,9 +74,7 @@ extern "C" {
 #define MADV_UNMERGEABLE 11
 #endif
 
-#ifndef __INSIDE_CYGWIN__
 extern void *mmap (void *__addr, size_t __len, int __prot, int __flags, int __fd, off_t __off);
-#endif
 extern int munmap (void *__addr, size_t __len);
 extern int mprotect (void *__addr, size_t __len, int __prot);
 extern int msync (void *__addr, size_t __len, int __flags);
diff --git a/winsup/cygwin/ipc.cc b/winsup/cygwin/ipc.cc
index 571ac8701..e670cdb2c 100644
--- a/winsup/cygwin/ipc.cc
+++ b/winsup/cygwin/ipc.cc
@@ -18,7 +18,7 @@ ftok (const char *path, int id)
 {
   struct stat statbuf;
   key_t tmp;
-  if (stat64 (path, &statbuf))
+  if (stat (path, &statbuf))
     {
       /* stat set the appropriate errno for us */
       return (key_t) -1;
diff --git a/winsup/cygwin/libc/fts.c b/winsup/cygwin/libc/fts.c
index 003f85146..1826d2213 100644
--- a/winsup/cygwin/libc/fts.c
+++ b/winsup/cygwin/libc/fts.c
@@ -58,17 +58,8 @@ __FBSDID("$FreeBSD: src/lib/libc/gen/fts.c,v 1.39 2013/02/11 02:00:16 svnexp Exp
 #define _open open
 #define _close close
 #define _dirfd dirfd
-#ifdef __x86_64__
 #define _fstat fstat
 #else
-extern int stat64 (const char *path, struct stat *buf);
-extern int fstat64 (int fd, struct stat *buf);
-extern int lstat64 (const char *path, struct stat *buf);
-#define stat(a,b) stat64((a),(b))
-#define _fstat(a,b) fstat64((a),(b))
-#define lstat(a,b) lstat64((a),(b))
-#endif
-#else
 #include "un-namespace.h"
 
 #include "gen-private.h"
diff --git a/winsup/cygwin/libc/minires.c b/winsup/cygwin/libc/minires.c
index b540f6a1b..5b43b3e68 100644
--- a/winsup/cygwin/libc/minires.c
+++ b/winsup/cygwin/libc/minires.c
@@ -237,12 +237,12 @@ static int open_sock(struct sockaddr_in *CliAddr, int debug)
     return -1;
   }
   /* Set non-blocking */
-  if (fcntl64(fd, F_SETFL, O_NONBLOCK) < 0)  {
+  if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)  {
     DPRINTF(debug, "fcntl: %s\n", strerror(errno));
     return -1;
   }
   /* Set close on exec flag */
-  if (fcntl64(fd, F_SETFD, 1) == -1) {
+  if (fcntl(fd, F_SETFD, 1) == -1) {
     DPRINTF(debug, "fcntl: %s\n", strerror(errno));
     return -1;
   }
diff --git a/winsup/cygwin/libc/rcmd.cc b/winsup/cygwin/libc/rcmd.cc
index 6d087d777..e606e73cf 100644
--- a/winsup/cygwin/libc/rcmd.cc
+++ b/winsup/cygwin/libc/rcmd.cc
@@ -103,7 +103,6 @@ extern "C" {
   int cygwin_rresvport_af(int *alport, int family);
   int cygwin_select (int, fd_set *, fd_set *, fd_set *, struct timeval *);
   int cygwin_socket (int, int, int);
-  int seteuid32 (uid_t);
 }
 #endif
 
@@ -200,7 +199,7 @@ cygwin_rcmd_af(char **ahost, in_port_t rport, const char *locuser,
 			    NULL);
 			return (-1);
 		}
-		fcntl64(s, F_SETOWN, pid);
+		fcntl(s, F_SETOWN, pid);
 		if (cygwin_connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
 			break;
 		(void)close(s);
@@ -458,10 +457,10 @@ again:
 		 * reading an NFS mounted file system, can't read files that
 		 * are protected read/write owner only.
 		 */
-		uid = geteuid32();
-		(void)seteuid32(pwd->pw_uid);
+		uid = geteuid();
+		(void)seteuid(pwd->pw_uid);
 		hostf = fopen(pbuf, "rt");
-		(void)seteuid32(uid);
+		(void)seteuid(uid);
 
 		if (hostf == NULL)
 			return (-1);
@@ -470,11 +469,11 @@ again:
 		 * user or root or if writeable by anyone but the owner, quit.
 		 */
 		cp = NULL;
-		if (lstat64(pbuf, &sbuf) < 0)
+		if (lstat(pbuf, &sbuf) < 0)
 			cp = ".rhosts lstat failed";
 		else if (!S_ISREG(sbuf.st_mode))
 			cp = ".rhosts not regular file";
-		else if (fstat64(fileno(hostf), &sbuf) < 0)
+		else if (fstat(fileno(hostf), &sbuf) < 0)
 			cp = ".rhosts fstat failed";
 		else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
 			cp = "bad .rhosts owner";
diff --git a/winsup/cygwin/libc/rexec.cc b/winsup/cygwin/libc/rexec.cc
index 7f25123a0..7e337f1e2 100644
--- a/winsup/cygwin/libc/rexec.cc
+++ b/winsup/cygwin/libc/rexec.cc
@@ -215,7 +215,7 @@ next:
 			break;
 		case PASSWD:
 			if ((*aname == 0 || strcmp(*aname, "anonymous")) &&
-			    fstat64(fileno(cfile), &stb) >= 0 &&
+			    fstat(fileno(cfile), &stb) >= 0 &&
 			    (stb.st_mode & 077) != 0) {
 	warnx("Error: .netrc file is readable by others.");
 	warnx("Remove password or make file unreadable by others.");
@@ -227,7 +227,7 @@ next:
 			}
 			break;
 		case ACCOUNT:
-			if (fstat64(fileno(cfile), &stb) >= 0
+			if (fstat(fileno(cfile), &stb) >= 0
 			    && (stb.st_mode & 077) != 0) {
 	warnx("Error: .netrc file is readable by others.");
 	warnx("Remove account or make file unreadable by others.");
diff --git a/winsup/cygwin/mktemp.cc b/winsup/cygwin/mktemp.cc
index 4dc157da4..710e432b4 100644
--- a/winsup/cygwin/mktemp.cc
+++ b/winsup/cygwin/mktemp.cc
@@ -100,7 +100,7 @@ _gettemp(char *path, int *doopen, int domkdir, size_t suffixlen, int flags)
 	  if (*trv == '/')
 	    {
 	      *trv = '\0';
-	      int rval = stat64 (path, &sbuf);
+	      int rval = stat (path, &sbuf);
 	      *trv = '/';
 	      if (rval != 0)
 		return 0;
@@ -131,7 +131,7 @@ _gettemp(char *path, int *doopen, int domkdir, size_t suffixlen, int flags)
 	  if (errno != EEXIST)
 	    return 0;
 	  }
-      else if (lstat64 (path, &sbuf))
+      else if (lstat (path, &sbuf))
 	return errno == ENOENT;
 
       /* If we have a collision, cycle through the space of filenames */
diff --git a/winsup/cygwin/mmap.cc b/winsup/cygwin/mmap.cc
index d8f5cf046..5aa6d0c09 100644
--- a/winsup/cygwin/mmap.cc
+++ b/winsup/cygwin/mmap.cc
@@ -238,7 +238,7 @@ MapView (HANDLE h, void *addr, size_t len, DWORD openflags,
      If it failed, and addr was not NULL and flags is not MAP_FIXED,
      try again with NULL address.
 
-     Note: Retrying the mapping might be unnecessary, now that mmap64 checks
+     Note: Retrying the mapping might be unnecessary, now that mmap checks
 	   for a valid memory area first. */
   SIZE_T commitsize = attached (prot) ? 0 : len;
   status = NtMapViewOfSection (h, NtCurrentProcess (), &base, 0, commitsize,
@@ -832,7 +832,7 @@ mmap_worker (mmap_list *map_list, fhandler_base *fh, caddr_t base, size_t len,
 }
 
 extern "C" void *
-mmap64 (void *addr, size_t len, int prot, int flags, int fd, off_t off)
+mmap (void *addr, size_t len, int prot, int flags, int fd, off_t off)
 {
   syscall_printf ("addr %p, len %lu, prot %y, flags %y, fd %d, off %Y",
 		  addr, len, prot, flags, fd, off);
@@ -1145,8 +1145,6 @@ out:
   return ret;
 }
 
-EXPORT_ALIAS (mmap64, mmap)
-
 /* munmap () removes all mmapped pages between addr and addr+len. */
 
 extern "C" int
@@ -1280,7 +1278,7 @@ mprotect (void *addr, size_t len, int prot)
 
   syscall_printf ("mprotect (addr: %p, len %lu, prot %y)", addr, len, prot);
 
-  /* See comment in mmap64 for a description. */
+  /* See comment in mmap for a description. */
   const size_t pagesize = wincap.allocation_granularity ();
   if ((uintptr_t) addr % pagesize)
     {
diff --git a/winsup/cygwin/passwd.cc b/winsup/cygwin/passwd.cc
index 1e4c5bab5..d1708953d 100644
--- a/winsup/cygwin/passwd.cc
+++ b/winsup/cygwin/passwd.cc
@@ -218,17 +218,15 @@ getpw_cp (struct passwd *temppw)
 }
 
 extern "C" struct passwd *
-getpwuid32 (uid_t uid)
+getpwuid (uid_t uid)
 {
   struct passwd *temppw = internal_getpwuid (uid);
   pthread_testcancel ();
   return getpw_cp (temppw);
 }
 
-EXPORT_ALIAS (getpwuid32, getpwuid)
-
 extern "C" int
-getpwuid_r32 (uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
+getpwuid_r (uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struct passwd **result)
 {
   *result = NULL;
 
@@ -260,8 +258,6 @@ getpwuid_r32 (uid_t uid, struct passwd *pwd, char *buffer, size_t bufsize, struc
   return 0;
 }
 
-EXPORT_ALIAS (getpwuid_r32, getpwuid_r)
-
 extern "C" struct passwd *
 getpwnam (const char *name)
 {
diff --git a/winsup/cygwin/path.cc b/winsup/cygwin/path.cc
index 0ccdf9832..5e6d0ea87 100644
--- a/winsup/cygwin/path.cc
+++ b/winsup/cygwin/path.cc
@@ -3720,8 +3720,8 @@ get_current_dir_name (void)
   struct stat pwdbuf, cwdbuf;
 
   if (pwd && strcmp (pwd, cwd) != 0
-      && stat64 (pwd, &pwdbuf) == 0
-      && stat64 (cwd, &cwdbuf) == 0
+      && stat (pwd, &pwdbuf) == 0
+      && stat (cwd, &cwdbuf) == 0
       && pwdbuf.st_dev == cwdbuf.st_dev
       && pwdbuf.st_ino == cwdbuf.st_ino)
     {
diff --git a/winsup/cygwin/posix_ipc.cc b/winsup/cygwin/posix_ipc.cc
index 1932ac8db..68d66e410 100644
--- a/winsup/cygwin/posix_ipc.cc
+++ b/winsup/cygwin/posix_ipc.cc
@@ -117,14 +117,14 @@ public:
     fl.l_whence = SEEK_SET;
     fl.l_start = 0;
     fl.l_len = size;
-    return fcntl64 (fd, F_SETLKW, &fl);
+    return fcntl (fd, F_SETLKW, &fl);
   }
   int unlock (int fd)
   {
     if (!fl.l_len)
       return 0;
     fl.l_type = F_UNLCK;
-    return fcntl64 (fd, F_SETLKW, &fl);
+    return fcntl (fd, F_SETLKW, &fl);
   }
 };
 
@@ -424,7 +424,7 @@ sem_open (const char *name, int oflag, ...)
       /* Make certain initialization is complete */
       for (i = 0; i < MAX_TRIES; i++)
 	{
-	  if (stat64 (semname, &statbuff) == -1)
+	  if (stat (semname, &statbuff) == -1)
 	    {
 	      if (errno == ENOENT && (oflag & O_CREAT))
 		{
@@ -476,7 +476,7 @@ sem_open (const char *name, int oflag, ...)
   return SEM_FAILED;
 }
 
-extern "C" off_t lseek64 (int, off_t, int);
+extern "C" off_t lseek (int, off_t, int);
 
 int
 _sem_close (sem_t *sem, bool do_close)
@@ -488,7 +488,7 @@ _sem_close (sem_t *sem, bool do_close)
   if (semaphore::getinternal (sem, &fd, &sf.hash, &sf.luid, &sf.value) == -1)
     return -1;
   if (!file.lock (fd, sizeof sf)
-      && lseek64 (fd, 0LL, SEEK_SET) != (off_t) -1
+      && lseek (fd, 0LL, SEEK_SET) != (off_t) -1
       && write (fd, &sf, sizeof sf) == sizeof sf)
     ret = do_close ? semaphore::close (sem) : 0;
 
diff --git a/winsup/cygwin/sec_acl.cc b/winsup/cygwin/sec_acl.cc
index a65d4a2b0..03dbb8050 100644
--- a/winsup/cygwin/sec_acl.cc
+++ b/winsup/cygwin/sec_acl.cc
@@ -1186,7 +1186,7 @@ out:
       memcpy (aclbufp, lacl, pos * sizeof (aclent_t));
       for (idx = 0; idx < pos; ++idx)
 	aclbufp[idx].a_perm &= S_IRWXO;
-      aclsort32 (pos, 0, aclbufp);
+      aclsort (pos, 0, aclbufp);
     }
   if (std_acl)
     *std_acl = standard_ACEs_only;
@@ -1207,7 +1207,7 @@ getacl (HANDLE handle, path_conv &pc, int nentries, aclent_t *aclbufp)
 }
 
 extern "C" int
-acl32 (const char *path, int cmd, int nentries, aclent_t *aclbufp)
+acl (const char *path, int cmd, int nentries, aclent_t *aclbufp)
 {
   int res = -1;
 
@@ -1229,7 +1229,7 @@ acl32 (const char *path, int cmd, int nentries, aclent_t *aclbufp)
 }
 
 extern "C" int
-facl32 (int fd, int cmd, int nentries, aclent_t *aclbufp)
+facl (int fd, int cmd, int nentries, aclent_t *aclbufp)
 {
   cygheap_fdget cfd (fd);
   if (cfd < 0)
@@ -1401,7 +1401,7 @@ __aclcheck (aclent_t *aclbufp, int nentries, int *which, bool posix)
 }
 
 extern "C" int
-aclcheck32 (aclent_t *aclbufp, int nentries, int *which)
+aclcheck (aclent_t *aclbufp, int nentries, int *which)
 {
   return __aclcheck (aclbufp, nentries, which, false);
 }
@@ -1466,10 +1466,10 @@ __aclsort (int nentries, aclent_t *aclbufp)
 }
 
 extern "C" int
-aclsort32 (int nentries, int calclass, aclent_t *aclbufp)
+aclsort (int nentries, int calclass, aclent_t *aclbufp)
 {
   if (!aclbufp || nentries < MIN_ACL_ENTRIES
-      || aclcheck32 (aclbufp, nentries, NULL))
+      || aclcheck (aclbufp, nentries, NULL))
     {
       set_errno (EINVAL);
       return -1;
@@ -1481,7 +1481,7 @@ aclsort32 (int nentries, int calclass, aclent_t *aclbufp)
 }
 
 extern "C" int
-acltomode32 (aclent_t *aclbufp, int nentries, mode_t *modep)
+acltomode (aclent_t *aclbufp, int nentries, mode_t *modep)
 {
   int pos;
 
@@ -1520,7 +1520,7 @@ acltomode32 (aclent_t *aclbufp, int nentries, mode_t *modep)
 }
 
 extern "C" int
-aclfrommode32 (aclent_t *aclbufp, int nentries, mode_t *modep)
+aclfrommode (aclent_t *aclbufp, int nentries, mode_t *modep)
 {
   int pos;
 
@@ -1557,15 +1557,15 @@ aclfrommode32 (aclent_t *aclbufp, int nentries, mode_t *modep)
 }
 
 extern "C" int
-acltopbits32 (aclent_t *aclbufp, int nentries, mode_t *pbitsp)
+acltopbits (aclent_t *aclbufp, int nentries, mode_t *pbitsp)
 {
-  return acltomode32 (aclbufp, nentries, pbitsp);
+  return acltomode (aclbufp, nentries, pbitsp);
 }
 
 extern "C" int
-aclfrompbits32 (aclent_t *aclbufp, int nentries, mode_t *pbitsp)
+aclfrompbits (aclent_t *aclbufp, int nentries, mode_t *pbitsp)
 {
-  return aclfrommode32 (aclbufp, nentries, pbitsp);
+  return aclfrommode (aclbufp, nentries, pbitsp);
 }
 
 static char *
@@ -1635,7 +1635,7 @@ __acltotext (aclent_t *aclbufp, int aclcnt, const char *prefix, char separator,
 	     int options)
 {
   if (!aclbufp || aclcnt < 0 || aclcnt > MAX_ACL_ENTRIES
-      || (aclcnt > 0 && aclsort32 (aclcnt, 0, aclbufp)))
+      || (aclcnt > 0 && aclsort (aclcnt, 0, aclbufp)))
     {
       set_errno (EINVAL);
       return NULL;
@@ -1776,7 +1776,7 @@ __acltotext (aclent_t *aclbufp, int aclcnt, const char *prefix, char separator,
 }
 
 extern "C" char *
-acltotext32 (aclent_t *aclbufp, int aclcnt)
+acltotext (aclent_t *aclbufp, int aclcnt)
 {
   return __acltotext (aclbufp, aclcnt, NULL, ',', 0);
 }
@@ -1960,18 +1960,7 @@ __aclfromtext (const char *acltextp, int *aclcnt, bool posix)
 }
 
 extern "C" aclent_t *
-aclfromtext32 (char *acltextp, int *aclcnt)
+aclfromtext (char *acltextp, int *aclcnt)
 {
   return (aclent_t *) __aclfromtext (acltextp, aclcnt, false);
 }
-
-EXPORT_ALIAS (acl32, acl)
-EXPORT_ALIAS (facl32, facl)
-EXPORT_ALIAS (aclcheck32, aclcheck)
-EXPORT_ALIAS (aclsort32, aclsort)
-EXPORT_ALIAS (acltomode32, acltomode)
-EXPORT_ALIAS (aclfrommode32, aclfrommode)
-EXPORT_ALIAS (acltopbits32, acltopbits)
-EXPORT_ALIAS (aclfrompbits32, aclfrompbits)
-EXPORT_ALIAS (acltotext32, acltotext)
-EXPORT_ALIAS (aclfromtext32, aclfromtext)
diff --git a/winsup/cygwin/security.cc b/winsup/cygwin/security.cc
index d48526619..04e777852 100644
--- a/winsup/cygwin/security.cc
+++ b/winsup/cygwin/security.cc
@@ -364,8 +364,8 @@ set_security_attribute (path_conv &pc, int attribute, PSECURITY_ATTRIBUTES psa,
   psa->lpSecurityDescriptor = sd.malloc (SECURITY_DESCRIPTOR_MIN_LENGTH);
   RtlCreateSecurityDescriptor ((PSECURITY_DESCRIPTOR) psa->lpSecurityDescriptor,
 				SECURITY_DESCRIPTOR_REVISION);
-  psa->lpSecurityDescriptor = set_posix_access (attribute, geteuid32 (),
-						getegid32 (), NULL, 0,
+  psa->lpSecurityDescriptor = set_posix_access (attribute, geteuid (),
+						getegid (), NULL, 0,
 						sd, false);
 }
 
diff --git a/winsup/cygwin/security.h b/winsup/cygwin/security.h
index f5ac1a922..ff2548027 100644
--- a/winsup/cygwin/security.h
+++ b/winsup/cygwin/security.h
@@ -438,8 +438,6 @@ bool authz_get_user_attribute (mode_t *attribute, PSECURITY_DESCRIPTOR psd,
 
 /* sec_acl.cc */
 struct acl;
-extern "C" int aclsort32 (int, int, struct acl *);
-extern "C" int acl32 (const char *, int, int, struct acl *);
 int searchace (struct acl *, int, int, uid_t id = ILLEGAL_UID);
 PSECURITY_DESCRIPTOR set_posix_access (mode_t, uid_t, gid_t, struct acl *, int,
 				       security_descriptor &, bool);
diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
index bd4910690..b88edd998 100644
--- a/winsup/cygwin/syscalls.cc
+++ b/winsup/cygwin/syscalls.cc
@@ -1599,7 +1599,7 @@ EXPORT_ALIAS (open, _open )
 EXPORT_ALIAS (open, _open64 )
 
 extern "C" off_t
-lseek64 (int fd, off_t pos, int dir)
+lseek (int fd, off_t pos, int dir)
 {
   off_t res;
 
@@ -1624,9 +1624,8 @@ lseek64 (int fd, off_t pos, int dir)
   return res;
 }
 
-EXPORT_ALIAS (lseek64, _lseek64)
-EXPORT_ALIAS (lseek64, lseek)
-EXPORT_ALIAS (lseek64, _lseek)
+EXPORT_ALIAS (lseek, _lseek64)
+EXPORT_ALIAS (lseek, _lseek)
 
 extern "C" int
 close (int fd)
@@ -1726,23 +1725,19 @@ chown_worker (const char *name, unsigned fmode, uid_t uid, gid_t gid)
 }
 
 extern "C" int
-chown32 (const char * name, uid_t uid, gid_t gid)
+chown (const char * name, uid_t uid, gid_t gid)
 {
   return chown_worker (name, PC_SYM_FOLLOW, uid, gid);
 }
 
-EXPORT_ALIAS (chown32, chown)
-
 extern "C" int
-lchown32 (const char * name, uid_t uid, gid_t gid)
+lchown (const char * name, uid_t uid, gid_t gid)
 {
   return chown_worker (name, PC_SYM_NOFOLLOW, uid, gid);
 }
 
-EXPORT_ALIAS (lchown32, lchown)
-
 extern "C" int
-fchown32 (int fd, uid_t uid, gid_t gid)
+fchown (int fd, uid_t uid, gid_t gid)
 {
   cygheap_fdget cfd (fd);
   if (cfd < 0)
@@ -1762,8 +1757,6 @@ fchown32 (int fd, uid_t uid, gid_t gid)
   return res;
 }
 
-EXPORT_ALIAS (fchown32, fchown)
-
 /* umask: POSIX 5.3.3.1 */
 extern "C" mode_t
 umask (mode_t mask)
@@ -1859,7 +1852,7 @@ fhandler_base::stat_fixup (struct stat *buf)
 	{
 	  if (!dev_st_inited)
 	    {
-	      stat64 ("/dev", &dev_st);
+	      stat ("/dev", &dev_st);
 	      dev_st_inited = true;
 	    }
 	  buf->st_dev = dev_st.st_dev;
@@ -1882,7 +1875,7 @@ fhandler_base::stat_fixup (struct stat *buf)
 }
 
 extern "C" int
-fstat64 (int fd, struct stat *buf)
+fstat (int fd, struct stat *buf)
 {
   int res;
 
@@ -1902,17 +1895,16 @@ fstat64 (int fd, struct stat *buf)
 }
 
 extern "C" int
-_fstat64_r (struct _reent *ptr, int fd, struct stat *buf)
+_fstat_r (struct _reent *ptr, int fd, struct stat *buf)
 {
   int ret;
 
-  if ((ret = fstat64 (fd, buf)) == -1)
+  if ((ret = fstat (fd, buf)) == -1)
     ptr->_errno = get_errno ();
   return ret;
 }
 
-EXPORT_ALIAS (fstat64, fstat)
-EXPORT_ALIAS (_fstat64_r, _fstat_r)
+EXPORT_ALIAS (_fstat_r, _fstat64_r)
 
 /* fsync: P96 6.6.1.1 */
 extern "C" int
@@ -2043,7 +2035,7 @@ stat_worker (path_conv &pc, struct stat *buf)
 }
 
 extern "C" int
-stat64 (const char *__restrict name, struct stat *__restrict buf)
+stat (const char *__restrict name, struct stat *__restrict buf)
 {
   syscall_printf ("entering");
   path_conv pc (name, PC_SYM_FOLLOW | PC_POSIX | PC_KEEP_HANDLE
@@ -2053,22 +2045,21 @@ stat64 (const char *__restrict name, struct stat *__restrict buf)
 }
 
 extern "C" int
-_stat64_r (struct _reent *__restrict ptr, const char *__restrict name,
+_stat_r (struct _reent *__restrict ptr, const char *__restrict name,
 	   struct stat *buf)
 {
   int ret;
 
-  if ((ret = stat64 (name, buf)) == -1)
+  if ((ret = stat (name, buf)) == -1)
     ptr->_errno = get_errno ();
   return ret;
 }
 
-EXPORT_ALIAS (stat64, stat)
-EXPORT_ALIAS (_stat64_r, _stat_r)
+EXPORT_ALIAS (_stat_r, _stat64_r)
 
 /* lstat: Provided by SVR4 and 4.3+BSD, POSIX? */
 extern "C" int
-lstat64 (const char *__restrict name, struct stat *__restrict buf)
+lstat (const char *__restrict name, struct stat *__restrict buf)
 {
   syscall_printf ("entering");
   path_conv pc (name, PC_SYM_NOFOLLOW | PC_POSIX | PC_KEEP_HANDLE,
@@ -2076,8 +2067,6 @@ lstat64 (const char *__restrict name, struct stat *__restrict buf)
   return stat_worker (pc, buf);
 }
 
-EXPORT_ALIAS (lstat64, lstat)
-
 extern "C" int
 access (const char *fn, int flags)
 {
@@ -3055,7 +3044,7 @@ posix_fallocate (int fd, off_t offset, off_t len)
 }
 
 extern "C" int
-ftruncate64 (int fd, off_t length)
+ftruncate (int fd, off_t length)
 {
   int res = -1;
   cygheap_fdget cfd (fd);
@@ -3074,11 +3063,9 @@ ftruncate64 (int fd, off_t length)
   return res;
 }
 
-EXPORT_ALIAS (ftruncate64, ftruncate)
-
 /* truncate: Provided by SVR4 and 4.3+BSD.  Not part of POSIX.1 or XPG3 */
 extern "C" int
-truncate64 (const char *pathname, off_t length)
+truncate (const char *pathname, off_t length)
 {
   int fd;
   int res = -1;
@@ -3087,7 +3074,7 @@ truncate64 (const char *pathname, off_t length)
 
   if (fd != -1)
     {
-      res = ftruncate64 (fd, length);
+      res = ftruncate (fd, length);
       close (fd);
     }
   syscall_printf ("%R = truncate(%s, %D)", res, pathname, length);
@@ -3095,8 +3082,6 @@ truncate64 (const char *pathname, off_t length)
   return res;
 }
 
-EXPORT_ALIAS (truncate64, truncate)
-
 extern "C" long
 _get_osfhandle (int fd)
 {
@@ -3293,7 +3278,7 @@ mknod_worker (path_conv &pc, mode_t mode, _major_t major, _minor_t minor)
 }
 
 extern "C" int
-mknod32 (const char *path, mode_t mode, dev_t dev)
+mknod (const char *path, mode_t mode, dev_t dev)
 {
   __try
     {
@@ -3354,17 +3339,15 @@ mknod32 (const char *path, mode_t mode, dev_t dev)
   return -1;
 }
 
-EXPORT_ALIAS (mknod32, mknod)
-
 extern "C" int
 mkfifo (const char *path, mode_t mode)
 {
-  return mknod32 (path, (mode & ~S_IFMT) | S_IFIFO, 0);
+  return mknod (path, (mode & ~S_IFMT) | S_IFIFO, 0);
 }
 
 /* seteuid: standards? */
 extern "C" int
-seteuid32 (uid_t uid)
+seteuid (uid_t uid)
 {
   debug_printf ("uid: %u myself->uid: %u myself->gid: %u",
 		uid, myself->uid, myself->gid);
@@ -3568,13 +3551,11 @@ seteuid32 (uid_t uid)
   return 0;
 }
 
-EXPORT_ALIAS (seteuid32, seteuid)
-
 /* setuid: POSIX 4.2.2.1 */
 extern "C" int
-setuid32 (uid_t uid)
+setuid (uid_t uid)
 {
-  int ret = seteuid32 (uid);
+  int ret = seteuid (uid);
   if (!ret)
     {
       cygheap->user.real_uid = myself->uid;
@@ -3585,20 +3566,18 @@ setuid32 (uid_t uid)
   return ret;
 }
 
-EXPORT_ALIAS (setuid32, setuid)
-
 extern "C" int
-setreuid32 (uid_t ruid, uid_t euid)
+setreuid (uid_t ruid, uid_t euid)
 {
   int ret = 0;
   bool tried = false;
   uid_t old_euid = myself->uid;
 
   if (ruid != ILLEGAL_UID && cygheap->user.real_uid != ruid && euid != ruid)
-    tried = !(ret = seteuid32 (ruid));
+    tried = !(ret = seteuid (ruid));
   if (!ret && euid != ILLEGAL_UID)
-    ret = seteuid32 (euid);
-  if (tried && (ret || euid == ILLEGAL_UID) && seteuid32 (old_euid))
+    ret = seteuid (euid);
+  if (tried && (ret || euid == ILLEGAL_UID) && seteuid (old_euid))
     system_printf ("Cannot restore original euid %u", old_euid);
   if (!ret && ruid != ILLEGAL_UID)
     cygheap->user.real_uid = ruid;
@@ -3606,11 +3585,9 @@ setreuid32 (uid_t ruid, uid_t euid)
   return ret;
 }
 
-EXPORT_ALIAS (setreuid32, setreuid)
-
 /* setegid: from System V.  */
 extern "C" int
-setegid32 (gid_t gid)
+setegid (gid_t gid)
 {
   debug_printf ("new egid: %u current: %u", gid, myself->gid);
 
@@ -3658,32 +3635,28 @@ setegid32 (gid_t gid)
   return 0;
 }
 
-EXPORT_ALIAS (setegid32, setegid)
-
 /* setgid: POSIX 4.2.2.1 */
 extern "C" int
-setgid32 (gid_t gid)
+setgid (gid_t gid)
 {
-  int ret = setegid32 (gid);
+  int ret = setegid (gid);
   if (!ret)
     cygheap->user.real_gid = myself->gid;
   return ret;
 }
 
-EXPORT_ALIAS (setgid32, setgid)
-
 extern "C" int
-setregid32 (gid_t rgid, gid_t egid)
+setregid (gid_t rgid, gid_t egid)
 {
   int ret = 0;
   bool tried = false;
   gid_t old_egid = myself->gid;
 
   if (rgid != ILLEGAL_GID && cygheap->user.real_gid != rgid && egid != rgid)
-    tried = !(ret = setegid32 (rgid));
+    tried = !(ret = setegid (rgid));
   if (!ret && egid != ILLEGAL_GID)
-    ret = setegid32 (egid);
-  if (tried && (ret || egid == ILLEGAL_GID) && setegid32 (old_egid))
+    ret = setegid (egid);
+  if (tried && (ret || egid == ILLEGAL_GID) && setegid (old_egid))
     system_printf ("Cannot restore original egid %u", old_egid);
   if (!ret && rgid != ILLEGAL_GID)
     cygheap->user.real_gid = rgid;
@@ -3691,8 +3664,6 @@ setregid32 (gid_t rgid, gid_t egid)
   return ret;
 }
 
-EXPORT_ALIAS (setregid32, setregid)
-
 /* chroot: privileged Unix system call.  */
 /* FIXME: Not privileged here. How should this be done? */
 extern "C" int
@@ -3896,13 +3867,13 @@ locked_append (int fd, const void * buf, size_t size)
   int count = 0;
 
   do
-    if ((lock_buffer.l_start = lseek64 (fd, 0, SEEK_END)) != (off_t) -1
-	&& fcntl64 (fd, F_SETLKW, &lock_buffer) != -1)
+    if ((lock_buffer.l_start = lseek (fd, 0, SEEK_END)) != (off_t) -1
+	&& fcntl (fd, F_SETLKW, &lock_buffer) != -1)
       {
-	if (lseek64 (fd, 0, SEEK_END) != (off_t) -1)
+	if (lseek (fd, 0, SEEK_END) != (off_t) -1)
 	  write (fd, buf, size);
 	lock_buffer.l_type = F_UNLCK;
-	fcntl64 (fd, F_SETLK, &lock_buffer);
+	fcntl (fd, F_SETLK, &lock_buffer);
 	break;
       }
   while (count++ < 1000
@@ -4394,22 +4365,22 @@ popen (const char *command, const char *in_type)
          end of the pipe.  Otherwise don't pass our end of the pipe to the
 	 child process. */
       if (pipe_flags & O_CLOEXEC)
-	fcntl64 (__std[stdchild], F_SETFD, 0);
+	fcntl (__std[stdchild], F_SETFD, 0);
       else
-	fcntl64 (myfd, F_SETFD, FD_CLOEXEC);
+	fcntl (myfd, F_SETFD, FD_CLOEXEC);
 
       /* Also don't pass the file handle currently associated with stdin/stdout
 	 to the child.  This function may actually fail if the stdchild fd
 	 is closed.  But that's ok. */
-      int stdchild_state = fcntl64 (stdchild, F_GETFD, 0);
-      fcntl64 (stdchild, F_SETFD, stdchild_state | FD_CLOEXEC);
+      int stdchild_state = fcntl (stdchild, F_GETFD, 0);
+      fcntl (stdchild, F_SETFD, stdchild_state | FD_CLOEXEC);
 
       /* Start a shell process to run the given command without forking. */
       pid_t pid = ch_spawn.worker ("/bin/sh", argv, cur_environ (), _P_NOWAIT,
 				   __std[0], __std[1]);
 
       /* Reinstate the close-on-exec state */
-      fcntl64 (stdchild, F_SETFD, stdchild_state);
+      fcntl (stdchild, F_SETFD, stdchild_state);
 
       /* If pid >= 0 then spawn_guts succeeded.  */
       if (pid >= 0)
@@ -4711,7 +4682,7 @@ fstatat (int dirfd, const char *__restrict pathname, struct stat *__restrict st,
 	      cwdstuff::cwd_lock.release ();
 	    }
 	  else
-	    return fstat64 (dirfd, st);
+	    return fstat (dirfd, st);
 	}
       path_conv pc (path, ((flags & AT_SYMLINK_NOFOLLOW)
 			   ? PC_SYM_NOFOLLOW : PC_SYM_FOLLOW)
@@ -4869,7 +4840,7 @@ mknodat (int dirfd, const char *pathname, mode_t mode, dev_t dev)
       char *path = tp.c_get ();
       if (gen_full_path_at (path, dirfd, pathname))
 	__leave;
-      return mknod32 (path, mode, dev);
+      return mknod (path, mode, dev);
     }
   __except (EFAULT) {}
   __endtry
diff --git a/winsup/cygwin/uinfo.cc b/winsup/cygwin/uinfo.cc
index f5d5093d3..ce997c0f8 100644
--- a/winsup/cygwin/uinfo.cc
+++ b/winsup/cygwin/uinfo.cc
@@ -279,37 +279,29 @@ getlogin (void)
 }
 
 extern "C" uid_t
-getuid32 (void)
+getuid (void)
 {
   return cygheap->user.real_uid;
 }
 
-EXPORT_ALIAS (getuid32, getuid)
-
 extern "C" gid_t
-getgid32 (void)
+getgid (void)
 {
   return cygheap->user.real_gid;
 }
 
-EXPORT_ALIAS (getgid32, getgid)
-
 extern "C" uid_t
-geteuid32 (void)
+geteuid (void)
 {
   return myself->uid;
 }
 
-EXPORT_ALIAS (geteuid32, geteuid)
-
 extern "C" gid_t
-getegid32 (void)
+getegid (void)
 {
   return myself->gid;
 }
 
-EXPORT_ALIAS (getegid32, getegid)
-
 /* Not quite right - cuserid can change, getlogin can't */
 extern "C" char *
 cuserid (char *src)
diff --git a/winsup/cygwin/winsup.h b/winsup/cygwin/winsup.h
index 1f265ec28..6d817f49f 100644
--- a/winsup/cygwin/winsup.h
+++ b/winsup/cygwin/winsup.h
@@ -41,17 +41,10 @@ details. */
 #ifdef __cplusplus
 extern "C" {
 #endif
-uid_t getuid32 ();
-uid_t geteuid32 ();
-int seteuid32 (uid_t);
-gid_t getegid32 (void);
-struct passwd *getpwuid32 (uid_t);
-struct passwd *getpwnam (const char *);
 struct __sFILE64 *fopen64 (const char *, const char *);
 struct hostent *cygwin_gethostbyname (const char *name);
 /* Don't enforce definition of in_addr_t. */
 uint32_t cygwin_inet_addr (const char *cp);
-int fcntl64 (int fd, int cmd, ...);
 #ifdef __cplusplus
 }
 #endif