diff --git a/configure b/configure
index 8e6becc726a..cfd0ceea098 100755
--- a/configure
+++ b/configure
@@ -5760,6 +5760,8 @@ for ac_func in \
 	lstat \
 	memmove \
 	mmap \
+	pread \
+	pwrite \
 	rfork \
 	select \
 	sendmsg \
@@ -5778,12 +5780,12 @@ for ac_func in \
 
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5782: checking for $ac_func" >&5
+echo "configure:5784: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5787 "configure"
+#line 5789 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5806,7 +5808,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5810: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5812: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5890,17 +5892,17 @@ for ac_hdr in \
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6
-echo "configure:5894: checking for $ac_hdr" >&5
+echo "configure:5896: checking for $ac_hdr" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5899 "configure"
+#line 5901 "configure"
 #include "confdefs.h"
 #include <$ac_hdr>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:5904: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:5906: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -5927,12 +5929,12 @@ fi
 done
 
 echo $ac_n "checking whether stat file-mode macros are broken""... $ac_c" 1>&6
-echo "configure:5931: checking whether stat file-mode macros are broken" >&5
+echo "configure:5933: checking whether stat file-mode macros are broken" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stat_broken'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5936 "configure"
+#line 5938 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -5985,12 +5987,12 @@ fi
 
 
 echo $ac_n "checking for working const""... $ac_c" 1>&6
-echo "configure:5989: checking for working const" >&5
+echo "configure:5991: checking for working const" >&5
 if eval "test \"`echo '$''{'ac_cv_c_const'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5994 "configure"
+#line 5996 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -6039,7 +6041,7 @@ ccp = (char const *const *) p;
 
 ; return 0; }
 EOF
-if { (eval echo configure:6043: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6045: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_const=yes
 else
@@ -6060,21 +6062,21 @@ EOF
 fi
 
 echo $ac_n "checking for inline""... $ac_c" 1>&6
-echo "configure:6064: checking for inline" >&5
+echo "configure:6066: checking for inline" >&5
 if eval "test \"`echo '$''{'ac_cv_c_inline'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_cv_c_inline=no
 for ac_kw in inline __inline__ __inline; do
   cat > conftest.$ac_ext <<EOF
-#line 6071 "configure"
+#line 6073 "configure"
 #include "confdefs.h"
 
 int main() {
 } $ac_kw foo() {
 ; return 0; }
 EOF
-if { (eval echo configure:6078: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6080: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_inline=$ac_kw; break
 else
@@ -6100,12 +6102,12 @@ EOF
 esac
 
 echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&6
-echo "configure:6104: checking for ANSI C header files" >&5
+echo "configure:6106: checking for ANSI C header files" >&5
 if eval "test \"`echo '$''{'ac_cv_header_stdc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6109 "configure"
+#line 6111 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 #include <stdarg.h>
@@ -6113,7 +6115,7 @@ else
 #include <float.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:6117: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:6119: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -6130,7 +6132,7 @@ rm -f conftest*
 if test $ac_cv_header_stdc = yes; then
   # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 6134 "configure"
+#line 6136 "configure"
 #include "confdefs.h"
 #include <string.h>
 EOF
@@ -6148,7 +6150,7 @@ fi
 if test $ac_cv_header_stdc = yes; then
   # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
 cat > conftest.$ac_ext <<EOF
-#line 6152 "configure"
+#line 6154 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 EOF
@@ -6169,7 +6171,7 @@ if test "$cross_compiling" = yes; then
   :
 else
   cat > conftest.$ac_ext <<EOF
-#line 6173 "configure"
+#line 6175 "configure"
 #include "confdefs.h"
 #include <ctype.h>
 #define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
@@ -6180,7 +6182,7 @@ if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
 exit (0); }
 
 EOF
-if { (eval echo configure:6184: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:6186: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   :
 else
@@ -6204,12 +6206,12 @@ EOF
 fi
 
 echo $ac_n "checking for size_t""... $ac_c" 1>&6
-echo "configure:6208: checking for size_t" >&5
+echo "configure:6210: checking for size_t" >&5
 if eval "test \"`echo '$''{'ac_cv_type_size_t'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6213 "configure"
+#line 6215 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #if STDC_HEADERS
@@ -6237,7 +6239,7 @@ EOF
 fi
 
 echo $ac_n "checking size of long long""... $ac_c" 1>&6
-echo "configure:6241: checking size of long long" >&5
+echo "configure:6243: checking size of long long" >&5
 if eval "test \"`echo '$''{'ac_cv_sizeof_long_long'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6245,7 +6247,7 @@ else
   ac_cv_sizeof_long_long=0
 else
   cat > conftest.$ac_ext <<EOF
-#line 6249 "configure"
+#line 6251 "configure"
 #include "confdefs.h"
 #include <stdio.h>
 #include <sys/types.h>
@@ -6257,7 +6259,7 @@ main()
   exit(0);
 }
 EOF
-if { (eval echo configure:6261: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+if { (eval echo configure:6263: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
 then
   ac_cv_sizeof_long_long=`cat conftestval`
 else
@@ -6278,12 +6280,12 @@ EOF
 
 
 echo $ac_n "checking whether linux/input.h is for real""... $ac_c" 1>&6
-echo "configure:6282: checking whether linux/input.h is for real" >&5
+echo "configure:6284: checking whether linux/input.h is for real" >&5
 if eval "test \"`echo '$''{'wine_cv_linux_input_h'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6287 "configure"
+#line 6289 "configure"
 #include "confdefs.h"
 
 	    #include <linux/input.h>
@@ -6296,7 +6298,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6300: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6302: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_linux_input_h=yes
 else
@@ -6320,12 +6322,12 @@ EOF
 
    
 echo $ac_n "checking whether we can use re-entrant gethostbyname_r Linux style""... $ac_c" 1>&6
-echo "configure:6324: checking whether we can use re-entrant gethostbyname_r Linux style" >&5
+echo "configure:6326: checking whether we can use re-entrant gethostbyname_r Linux style" >&5
 if eval "test \"`echo '$''{'wine_cv_linux_gethostbyname_r_6'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6329 "configure"
+#line 6331 "configure"
 #include "confdefs.h"
 
 #include <netdb.h>
@@ -6346,7 +6348,7 @@ int main() {
     
 ; return 0; }
 EOF
-if { (eval echo configure:6350: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6352: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_linux_gethostbyname_r_6=yes
 else
@@ -6372,12 +6374,12 @@ EOF
 if test "$ac_cv_header_linux_joystick_h" = "yes"
 then
    echo $ac_n "checking whether linux/joystick.h uses the Linux 2.2+ API""... $ac_c" 1>&6
-echo "configure:6376: checking whether linux/joystick.h uses the Linux 2.2+ API" >&5
+echo "configure:6378: checking whether linux/joystick.h uses the Linux 2.2+ API" >&5
 if eval "test \"`echo '$''{'wine_cv_linux_joystick_22_api'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6381 "configure"
+#line 6383 "configure"
 #include "confdefs.h"
 
 	#include <sys/ioctl.h>
@@ -6392,7 +6394,7 @@ int main() {
 /*empty*/
 ; return 0; }
 EOF
-if { (eval echo configure:6396: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6398: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_linux_joystick_22_api=yes
 else
@@ -6419,12 +6421,12 @@ fi
 if test "$ac_cv_header_sys_vfs_h" = "yes"
 then
     echo $ac_n "checking whether sys/vfs.h defines statfs""... $ac_c" 1>&6
-echo "configure:6423: checking whether sys/vfs.h defines statfs" >&5
+echo "configure:6425: checking whether sys/vfs.h defines statfs" >&5
 if eval "test \"`echo '$''{'wine_cv_sys_vfs_has_statfs'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6428 "configure"
+#line 6430 "configure"
 #include "confdefs.h"
 
 	#include <sys/types.h>
@@ -6441,7 +6443,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6445: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6447: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_sys_vfs_has_statfs=yes
 else
@@ -6468,12 +6470,12 @@ fi
 if test "$ac_cv_header_sys_statfs_h" = "yes"
 then
     echo $ac_n "checking whether sys/statfs.h defines statfs""... $ac_c" 1>&6
-echo "configure:6472: checking whether sys/statfs.h defines statfs" >&5
+echo "configure:6474: checking whether sys/statfs.h defines statfs" >&5
 if eval "test \"`echo '$''{'wine_cv_sys_statfs_has_statfs'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6477 "configure"
+#line 6479 "configure"
 #include "confdefs.h"
 
 	#include <sys/types.h>
@@ -6488,7 +6490,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6492: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6494: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_sys_statfs_has_statfs=yes
 else
@@ -6515,12 +6517,12 @@ fi
 if test "$ac_cv_header_sys_mount_h" = "yes"
 then
     echo $ac_n "checking whether sys/mount.h defines statfs""... $ac_c" 1>&6
-echo "configure:6519: checking whether sys/mount.h defines statfs" >&5
+echo "configure:6521: checking whether sys/mount.h defines statfs" >&5
 if eval "test \"`echo '$''{'wine_cv_sys_mount_has_statfs'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6524 "configure"
+#line 6526 "configure"
 #include "confdefs.h"
 
 	#include <sys/types.h>
@@ -6535,7 +6537,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6539: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6541: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_sys_mount_has_statfs=yes
 else
@@ -6561,7 +6563,7 @@ fi
 
 
 echo $ac_n "checking for statfs.f_bfree""... $ac_c" 1>&6
-echo "configure:6565: checking for statfs.f_bfree" >&5
+echo "configure:6567: checking for statfs.f_bfree" >&5
 if eval "test \"`echo '$''{'wine_cv_statfs_bfree'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6570,7 +6572,7 @@ else
         wine_cv_statfs_bfree=no
     else
     	cat > conftest.$ac_ext <<EOF
-#line 6574 "configure"
+#line 6576 "configure"
 #include "confdefs.h"
 
 	#include <sys/types.h>
@@ -6597,7 +6599,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6601: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6603: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_statfs_bfree=yes
 else
@@ -6621,7 +6623,7 @@ EOF
 fi
 
 echo $ac_n "checking for statfs.f_bavail""... $ac_c" 1>&6
-echo "configure:6625: checking for statfs.f_bavail" >&5
+echo "configure:6627: checking for statfs.f_bavail" >&5
 if eval "test \"`echo '$''{'wine_cv_statfs_bavail'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -6630,7 +6632,7 @@ else
         wine_cv_statfs_bavail=no
     else
     	cat > conftest.$ac_ext <<EOF
-#line 6634 "configure"
+#line 6636 "configure"
 #include "confdefs.h"
 
 	#include <sys/types.h>
@@ -6657,7 +6659,7 @@ int main() {
 	
 ; return 0; }
 EOF
-if { (eval echo configure:6661: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6663: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   wine_cv_statfs_bavail=yes
 else
@@ -6682,12 +6684,12 @@ fi
 
 
 echo $ac_n "checking for msg_accrights in struct msghdr""... $ac_c" 1>&6
-echo "configure:6686: checking for msg_accrights in struct msghdr" >&5
+echo "configure:6688: checking for msg_accrights in struct msghdr" >&5
 if eval "test \"`echo '$''{'ac_cv_c_msg_accrights'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6691 "configure"
+#line 6693 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -6695,7 +6697,7 @@ int main() {
 struct msghdr hdr; hdr.msg_accrights=0
 ; return 0; }
 EOF
-if { (eval echo configure:6699: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6701: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_msg_accrights="yes"
 else
@@ -6718,12 +6720,12 @@ fi
 
 
 echo $ac_n "checking for sa_len in struct sockaddr""... $ac_c" 1>&6
-echo "configure:6722: checking for sa_len in struct sockaddr" >&5
+echo "configure:6724: checking for sa_len in struct sockaddr" >&5
 if eval "test \"`echo '$''{'ac_cv_c_sockaddr_sa_len'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6727 "configure"
+#line 6729 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -6732,7 +6734,7 @@ int main() {
 static struct sockaddr addr; addr.sa_len = 1
 ; return 0; }
 EOF
-if { (eval echo configure:6736: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6738: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_sockaddr_sa_len="yes"
 else
@@ -6755,12 +6757,12 @@ fi
 
 
 echo $ac_n "checking for sun_len in struct sockaddr_un""... $ac_c" 1>&6
-echo "configure:6759: checking for sun_len in struct sockaddr_un" >&5
+echo "configure:6761: checking for sun_len in struct sockaddr_un" >&5
 if eval "test \"`echo '$''{'ac_cv_c_sockaddr_sun_len'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6764 "configure"
+#line 6766 "configure"
 #include "confdefs.h"
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -6769,7 +6771,7 @@ int main() {
 static struct sockaddr_un addr; addr.sun_len = 1
 ; return 0; }
 EOF
-if { (eval echo configure:6773: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:6775: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_c_sockaddr_sun_len="yes"
 else
@@ -6792,12 +6794,12 @@ fi
 
 
 echo $ac_n "checking whether we need to define __i386__""... $ac_c" 1>&6
-echo "configure:6796: checking whether we need to define __i386__" >&5
+echo "configure:6798: checking whether we need to define __i386__" >&5
 if eval "test \"`echo '$''{'ac_cv_cpp_def_i386'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 6801 "configure"
+#line 6803 "configure"
 #include "confdefs.h"
 #if (defined(i386) || defined(__i386)) && !defined(__i386__)
 yes
diff --git a/configure.in b/configure.in
index 1d0436ff6d7..88c86ba2874 100644
--- a/configure.in
+++ b/configure.in
@@ -818,6 +818,8 @@ AC_CHECK_FUNCS(\
 	lstat \
 	memmove \
 	mmap \
+	pread \
+	pwrite \
 	rfork \
 	select \
 	sendmsg \
diff --git a/include/config.h.in b/include/config.h.in
index af00d74705d..d52126ed545 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -121,6 +121,12 @@
 /* Define if you have the openpty function.  */
 #undef HAVE_OPENPTY
 
+/* Define if you have the pread function.  */
+#undef HAVE_PREAD
+
+/* Define if you have the pwrite function.  */
+#undef HAVE_PWRITE
+
 /* Define if you have the resizeterm function.  */
 #undef HAVE_RESIZETERM
 
diff --git a/include/wine/obj_storage.h b/include/wine/obj_storage.h
index 96b7e18e251..4ff658d7a6f 100644
--- a/include/wine/obj_storage.h
+++ b/include/wine/obj_storage.h
@@ -14,6 +14,7 @@ extern "C" {
  */
 typedef enum tagLOCKTYPE
 {
+#undef LOCK_WRITE
 	LOCK_WRITE = 1,
 	LOCK_EXCLUSIVE = 2,
 	LOCK_ONLYONCE = 4
diff --git a/include/wine/port.h b/include/wine/port.h
index e9ed068c590..57f9ca49fed 100644
--- a/include/wine/port.h
+++ b/include/wine/port.h
@@ -10,6 +10,7 @@
 # error You must include config.h to use this header  
 #endif  
 
+#define _GNU_SOURCE  /* for pread/pwrite */
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/time.h>
@@ -135,6 +136,14 @@ int usleep (unsigned int useconds);
 int lstat(const char *file_name, struct stat *buf);
 #endif /* HAVE_LSTAT */
 
+#ifndef HAVE_PREAD
+ssize_t pread( int fd, void *buf, size_t count, off_t offset );
+#endif /* HAVE_PREAD */
+
+#ifndef HAVE_PWRITE
+ssize_t pwrite( int fd, const void *buf, size_t count, off_t offset );
+#endif /* HAVE_PWRITE */
+
 #ifndef S_ISLNK
 #define S_ISLNK(mod) (0)
 #endif /* S_ISLNK */
diff --git a/library/port.c b/library/port.c
index 132cbed0b75..7763081fddd 100644
--- a/library/port.c
+++ b/library/port.c
@@ -379,6 +379,59 @@ int lstat(const char *file_name, struct stat *buf)
 }
 #endif /* HAVE_LSTAT */
 
+
+/***********************************************************************
+ *		pread
+ *
+ * FIXME: this is not thread-safe
+ */
+#ifndef HAVE_PREAD
+ssize_t pread( int fd, void *buf, size_t count, off_t offset )
+{
+    ssize_t ret;
+    off_t old_pos;
+
+    if ((old_pos = lseek( fd, 0, SEEK_CUR )) == -1) return -1;
+    if (lseek( fd, offset, SEEK_SET ) == -1) return -1;
+    if ((ret = read( fd, buf, count )) == -1)
+    {
+        int err = errno;  /* save errno */
+        lseek( fd, old_pos, SEEK_SET );
+        errno = err;
+        return -1;
+    }
+    if (lseek( fd, old_pos, SEEK_SET ) == -1) return -1;
+    return ret;
+}
+#endif /* HAVE_PREAD */
+
+
+/***********************************************************************
+ *		pwrite
+ *
+ * FIXME: this is not thread-safe
+ */
+#ifndef HAVE_PWRITE
+ssize_t pwrite( int fd, const void *buf, size_t count, off_t offset )
+{
+    ssize_t ret;
+    off_t old_pos;
+
+    if ((old_pos = lseek( fd, 0, SEEK_CUR )) == -1) return -1;
+    if (lseek( fd, offset, SEEK_SET ) == -1) return -1;
+    if ((ret = write( fd, buf, count )) == -1)
+    {
+        int err = errno;  /* save errno */
+        lseek( fd, old_pos, SEEK_SET );
+        errno = err;
+        return -1;
+    }
+    if (lseek( fd, old_pos, SEEK_SET ) == -1) return -1;
+    return ret;
+}
+#endif /* HAVE_PWRITE */
+
+
 /***********************************************************************
  *		getrlimit
  */