provided POSIX users abstraction in libstd (new functions: getuid, geteuid, getpwuid, getpwnam)

git-svn-id: https://gcc.gnu.org/svn/gcc/branches/st/cli-be@170491 138bc75d-0d04-0410-961f-82ee72b054a4

11 files changed, 371 insertions, 4 deletions

diff --git a/libstd/include/Makefile.am b/libstd/include/Makefile.am
index e7bfe2f050d..3e18da94c1e 100644
--- a/libstd/include/Makefile.am
+++ b/libstd/include/Makefile.am
@@ -19,6 +19,7 @@ include_HEADERS = \
 	locale.h \
 	malloc.h \
 	math.h \
+	pwd.h \
 	setjmp.h \
 	signal.h \
 	stdbool.h \
diff --git a/libstd/include/Makefile.in b/libstd/include/Makefile.in
index 21d36427266..3a5d8e8f1b3 100644
--- a/libstd/include/Makefile.in
+++ b/libstd/include/Makefile.in
@@ -200,6 +200,7 @@ include_HEADERS = \
 	locale.h \
 	malloc.h \
 	math.h \
+	pwd.h \
 	setjmp.h \
 	signal.h \
 	stdbool.h \
diff --git a/libstd/include/__host.h b/libstd/include/__host.h
index 45967ca0e26..d618df8c145 100644
--- a/libstd/include/__host.h
+++ b/libstd/include/__host.h
@@ -108,6 +108,16 @@ LIBSTD_HPROTO(void, gettimeofday, void *tv_sec, void *tv_usec);
 
 /* Getting process time informations */
 LIBSTD_HPROTO(int, gettimes, unsigned long *clks, unsigned long * tms_utime, unsigned long *tms_stime, unsigned long *tms_cutime, unsigned long *tms_cstime);
+
+/* User information*/
+LIBSTD_HPROTO(unsigned int, getuid, void);
+LIBSTD_HPROTO(unsigned int, geteuid, void);
+
+LIBSTD_HPROTO(int, getpwuid, unsigned int uid, char **name, char **passwd,
+  unsigned int *gid, char **gecos, char **dir, char **shell);
+LIBSTD_HPROTO(int, getpwnam, char *name, char **passwd, unsigned int *uid, 
+  unsigned int *gid, char **gecos, char **dir, char **shell);
+
  
 /* Floating point classification */
 LIBSTD_HPROTO(int, fpclassify, double p0);
diff --git a/libstd/include/pwd.h b/libstd/include/pwd.h
new file mode 100644
index 00000000000..d253f5ca0f5
--- /dev/null
+++ b/libstd/include/pwd.h
@@ -0,0 +1,53 @@
+/*
+
+   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Contributed by STMicroelectronics
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+
+#ifndef __PWD_H
+#define __PWD_H
+
+#include <__cdefs.h>
+
+
+#include <sys/types.h>
+#include <stddef.h>
+
+__BEGIN_EXTERN_C
+
+/* The passwd structure.  */
+struct passwd
+{
+  char *pw_name;      /* Username.  */
+  char *pw_passwd;    /* Password.  */
+  uid_t pw_uid;	      /* User ID.  */
+  gid_t pw_gid;       /* Group ID.  */
+  char *pw_gecos;     /* Real name.  */
+  char *pw_dir;       /* Home directory.  */
+  char *pw_shell;     /* Shell program.  */
+};
+
+/* Implemented in src/_users.c */
+LIBSTD_LPROTO(struct passwd *, getpwuid, uid_t);
+LIBSTD_LPROTO(struct passwd *, getpwnam, char *);
+
+__END_EXTERN_C
+
+#endif /*__PWD_H*/
+
diff --git a/libstd/include/unistd.h b/libstd/include/unistd.h
index 64aa72916ba..04161268333 100644
--- a/libstd/include/unistd.h
+++ b/libstd/include/unistd.h
@@ -49,6 +49,10 @@ LIBSTD_LPROTO(long, sysconf, int);
 
 LIBSTD_LPROTO(int, isatty, int);
 
+/* Implemented in src/_users.c */
+LIBSTD_LPROTO(uid_t, getuid, void);
+LIBSTD_LPROTO(uid_t, geteuid, void);
+
 __END_EXTERN_C
 
 #endif /*__UNISTD_H__*/
diff --git a/libstd/src/MSCorelibWrapper.cs b/libstd/src/MSCorelibWrapper.cs
index 7b5677c0d8b..7227fd44e67 100644
--- a/libstd/src/MSCorelibWrapper.cs
+++ b/libstd/src/MSCorelibWrapper.cs
@@ -28,6 +28,7 @@ using System.Security.Principal;
 using System.Security.AccessControl;
 using System.Runtime.InteropServices;
 using System.Diagnostics;
+using System.Collections;
 
 public class MSCorelibWrapper
 {
@@ -120,6 +121,9 @@ public class MSCorelibWrapper
         initial_ticks = DateTime.UtcNow.Ticks;
         // Init the internal buffer array
         buffer = new byte[buffer_size];
+
+        /* Matching (pseudo)POSIX <--> .NET users */
+        InitUsers ();
     }
 
     private static int allocateHandle(Stream stream)
@@ -774,6 +778,134 @@ public class MSCorelibWrapper
         }
     }
 
+    /*****************        User information         *******************/
+    /* This provides an abstraction of POSIX users. Values for uid are
+       coherent ONLY inside this library, and don't match the underlying
+       system ones -in case the that there is a POSIX system-. 
+       
+       UID are generated (in a random way) from user strings. Thus,
+       a call recieving an UID as argument will only accept the
+       user if it has been generated inside the library; via:
+        - getuid(), geteuid()
+        - getpwnam()
+        - stat() -users not yet implemented here-
+    */
+
+    class UserPair {
+      public UserPair (String name, uint uid) {
+        this.name = name;
+        this.uid  = uid;
+      }
+
+      public String  name;
+      public uint    uid;
+    };
+
+    private static ArrayList users_set;
+    private static uint      users_count;
+
+    private static void InitUsers ()
+    {
+      users_set = new ArrayList(8);
+      users_count = 0;
+    }
+
+    private static uint GetUidFromName (String name)
+    {
+      uint uid = 0;
+
+      foreach (UserPair user in users_set)
+        {
+          if (user.name == name)
+            uid = user.uid;
+        }
+
+      if (uid != 0)
+        return uid;
+
+      /* here is where users join users_set */
+      uid = ++users_count;
+      users_set.Add (new UserPair (name, uid));
+      return uid;
+    }
+
+    private static String GetNameFromUid (uint uid)
+    {
+      foreach (UserPair user in users_set)
+        {
+          if (user.uid == uid)
+            return user.name;
+        }
+
+      /* may be an UID external to this implementation, not supported */
+      throw new Exception("the specified UID does not exist");
+    }
+
+    /* POSIX user-related functions */
+    public static uint getuid ()
+    {
+      String name = WindowsIdentity.GetCurrent().Name;
+
+      return GetUidFromName (name);
+    }
+    
+    public static uint geteuid ()
+    {
+      /* Are there "effective users" in .NET? Is that impersonation? */
+      return getuid ();
+    }
+
+    unsafe public static int getpwuid (uint uid, sbyte** name, sbyte** passwd,
+                                        uint* gid, sbyte** gecos, sbyte** dir, sbyte** shell)
+    {
+      String str_name;
+
+      try {
+        str_name = GetNameFromUid (uid);
+      } catch (Exception) {
+        my_errno = __LIBSTD_ENOENT;
+        return -1;
+      }
+
+      *name = (sbyte*) Marshal.StringToHGlobalAnsi(str_name).ToPointer();
+
+      return getpw_base (str_name, passwd, gid, gecos, dir, shell);
+    }
+
+    unsafe public static int getpwnam (sbyte* name, sbyte** passwd, uint* uid,
+                                        uint* gid, sbyte** gecos, sbyte** dir, sbyte** shell)
+    {
+      String str_name = Marshal.PtrToStringAnsi(new IntPtr(name));
+
+      *uid = GetUidFromName (str_name);
+
+      return getpw_base (str_name, passwd, gid, gecos, dir, shell);
+    }
+
+    unsafe private static int getpw_base (String name, sbyte** passwd, uint* gid,
+                                          sbyte** gecos, sbyte** dir, sbyte** shell)
+    {
+      /*home_path = (Environment.OSVersion.Platform == PlatformID.Unix || 
+                   Environment.OSVersion.Platform == PlatformID.MacOSX)
+          ? Environment.GetEnvironmentVariable("HOME")
+          : Environment.ExpandEnvironmentVariables("%HOMEDRIVE%%HOMEPATH%");*/
+ 
+      *passwd = (sbyte*) new IntPtr(0);
+      *gid = 0;
+      /* TODO: may be we can find the actual name */
+      *gecos = (sbyte*)  Marshal.StringToHGlobalAnsi(name).ToPointer();
+      if (name == WindowsIdentity.GetCurrent().Name)
+        {
+          String home_path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
+          *dir = (sbyte*) Marshal.StringToHGlobalAnsi(home_path).ToPointer();
+        }
+      else
+        *dir = (sbyte*) new IntPtr(0);
+      *shell = (sbyte*) new IntPtr(0);
+
+      return 0;
+    }
+
     public static double dbl_epsilon()
     {
         return System.Double.Epsilon;
diff --git a/libstd/src/Makefile.am b/libstd/src/Makefile.am
index 5b69b567968..756afc81ed1 100644
--- a/libstd/src/Makefile.am
+++ b/libstd/src/Makefile.am
@@ -10,6 +10,7 @@ SRC = _Exit.c \
       __io_perm.c \
       __libinfo.c \
       __libstd_initfini.c \
+      _users.c \
       abort.c \
       abs.c \
       asctime.c \
diff --git a/libstd/src/Makefile.in b/libstd/src/Makefile.in
index 49dbf41b804..3b22605c0a0 100644
--- a/libstd/src/Makefile.in
+++ b/libstd/src/Makefile.in
@@ -64,7 +64,7 @@ am__objects_1 = libstd_la-_Exit.lo libstd_la-__io_device.lo \
 	libstd_la-__io_fopen.lo libstd_la-__io_fout.lo \
 	libstd_la-__io_fread.lo libstd_la-__io_ftable.lo \
 	libstd_la-__io_perm.lo libstd_la-__libinfo.lo \
-	libstd_la-__libstd_initfini.lo libstd_la-abort.lo \
+	libstd_la-__libstd_initfini.lo libstd_la-_users.lo libstd_la-abort.lo \
 	libstd_la-abs.lo libstd_la-asctime.lo libstd_la-assert.lo \
 	libstd_la-basename.lo libstd_la-bsearch.lo libstd_la-calloc.lo \
 	libstd_la-clearerr.lo libstd_la-close.lo libstd_la-creat.lo \
@@ -120,7 +120,7 @@ am__objects_2 = libstd_dll-_Exit.$(OBJEXT) \
 	libstd_dll-__io_fread.$(OBJEXT) \
 	libstd_dll-__io_ftable.$(OBJEXT) \
 	libstd_dll-__io_perm.$(OBJEXT) libstd_dll-__libinfo.$(OBJEXT) \
-	libstd_dll-__libstd_initfini.$(OBJEXT) \
+	libstd_dll-__libstd_initfini.$(OBJEXT) libstd_dll-_users.$(OBJEXT) \
 	libstd_dll-abort.$(OBJEXT) libstd_dll-abs.$(OBJEXT) \
 	libstd_dll-asctime.$(OBJEXT) libstd_dll-assert.$(OBJEXT) \
 	libstd_dll-basename.$(OBJEXT) libstd_dll-bsearch.$(OBJEXT) \
@@ -327,6 +327,7 @@ SRC = _Exit.c \
       __io_perm.c \
       __libinfo.c \
       __libstd_initfini.c \
+      _users.c \
       abort.c \
       abs.c \
       asctime.c \
@@ -549,6 +550,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-__io_perm.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-__libinfo.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-__libstd_initfini.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-_users.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-abort.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-abs.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_dll-asctime.Po@am__quote@
@@ -678,6 +680,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-__io_perm.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-__libinfo.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-__libstd_initfini.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-_users.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-abort.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-abs.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libstd_la-asctime.Plo@am__quote@
@@ -895,6 +898,13 @@ libstd_la-__libstd_initfini.lo: __libstd_initfini.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_la_CFLAGS) $(CFLAGS) -c -o libstd_la-__libstd_initfini.lo `test -f '__libstd_initfini.c' || echo '$(srcdir)/'`__libstd_initfini.c
 
+libstd_la-_users.lo: _users.c
+@am__fastdepCC_TRUE@	if $(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_la_CFLAGS) $(CFLAGS) -MT libstd_la-_users.lo -MD -MP -MF "$(DEPDIR)/libstd_la-_users.Tpo" -c -o libstd_la-_users.lo `test -f '_users.c' || echo '$(srcdir)/'`_users.c; \
+@am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/libstd_la-_users.Tpo" "$(DEPDIR)/libstd_la-_users.Plo"; else rm -f "$(DEPDIR)/libstd_la-_users.Tpo"; exit 1; fi
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='_users.c' object='libstd_la-_users.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_la_CFLAGS) $(CFLAGS) -c -o libstd_la-_users.lo `test -f '_users.c' || echo '$(srcdir)/'`_users.c
+
 libstd_la-abort.lo: abort.c
 @am__fastdepCC_TRUE@	if $(LIBTOOL) --tag=CC --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_la_CFLAGS) $(CFLAGS) -MT libstd_la-abort.lo -MD -MP -MF "$(DEPDIR)/libstd_la-abort.Tpo" -c -o libstd_la-abort.lo `test -f 'abort.c' || echo '$(srcdir)/'`abort.c; \
 @am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/libstd_la-abort.Tpo" "$(DEPDIR)/libstd_la-abort.Plo"; else rm -f "$(DEPDIR)/libstd_la-abort.Tpo"; exit 1; fi
@@ -1875,6 +1885,20 @@ libstd_dll-__libstd_initfini.obj: __libstd_initfini.c
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
 @am__fastdepCC_FALSE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -c -o libstd_dll-__libstd_initfini.obj `if test -f '__libstd_initfini.c'; then $(CYGPATH_W) '__libstd_initfini.c'; else $(CYGPATH_W) '$(srcdir)/__libstd_initfini.c'; fi`
 
+libstd_dll-_users.o: _users.c
+@am__fastdepCC_TRUE@	if $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -MT libstd_dll-_users.o -MD -MP -MF "$(DEPDIR)/libstd_dll-_users.Tpo" -c -o libstd_dll-_users.o `test -f '_users.c' || echo '$(srcdir)/'`_users.c; \
+@am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/libstd_dll-_users.Tpo" "$(DEPDIR)/libstd_dll-_users.Po"; else rm -f "$(DEPDIR)/libstd_dll-_users.Tpo"; exit 1; fi
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='_users.c' object='libstd_dll-_users.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -c -o libstd_dll-_users.o `test -f '_users.c' || echo '$(srcdir)/'`_users.c
+
+libstd_dll-_users.obj: _users.c
+@am__fastdepCC_TRUE@	if $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -MT libstd_dll-_users.obj -MD -MP -MF "$(DEPDIR)/libstd_dll-_users.Tpo" -c -o libstd_dll-_users.obj `if test -f '_users.c'; then $(CYGPATH_W) '_users.c'; else $(CYGPATH_W) '$(srcdir)/_users.c'; fi`; \
+@am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/libstd_dll-_users.Tpo" "$(DEPDIR)/libstd_dll-_users.Po"; else rm -f "$(DEPDIR)/libstd_dll-_users.Tpo"; exit 1; fi
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	source='_users.c' object='libstd_dll-_users.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -c -o libstd_dll-_users.obj `if test -f '_users.c'; then $(CYGPATH_W) '_users.c'; else $(CYGPATH_W) '$(srcdir)/_users.c'; fi`
+
 libstd_dll-abort.o: abort.c
 @am__fastdepCC_TRUE@	if $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libstd_dll_CFLAGS) $(CFLAGS) -MT libstd_dll-abort.o -MD -MP -MF "$(DEPDIR)/libstd_dll-abort.Tpo" -c -o libstd_dll-abort.o `test -f 'abort.c' || echo '$(srcdir)/'`abort.c; \
 @am__fastdepCC_TRUE@	then mv -f "$(DEPDIR)/libstd_dll-abort.Tpo" "$(DEPDIR)/libstd_dll-abort.Po"; else rm -f "$(DEPDIR)/libstd_dll-abort.Tpo"; exit 1; fi
diff --git a/libstd/src/__host.c b/libstd/src/__host.c
index d0428b0fbca..a5adde2cdcc 100644
--- a/libstd/src/__host.c
+++ b/libstd/src/__host.c
@@ -50,8 +50,7 @@ Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/times.h>
-
-
+#include <pwd.h>
 
 static int my_errno = 0;
 
@@ -444,6 +443,53 @@ LIBSTD_HPROTO_IMPL(long, getsysconf, int name)
   return sysconf(name);
 }
 
+/* user information */
+LIBSTD_HPROTO_IMPL(unsigned int, getuid, void)
+{
+  return getuid ();
+}
+
+LIBSTD_HPROTO_IMPL(unsigned int, geteuid, void)
+{
+  return geteuid ();
+}
+
+LIBSTD_HPROTO_IMPL(int, getpwuid, unsigned int uid, char **name, char **passwd,
+  unsigned int *gid, char **gecos, char **dir, char **shell)
+{
+  struct passwd * pwd = getpwuid(uid);
+  
+  if (!pwd)
+    return -1;
+
+  *name   = pwd->pw_name;
+  *passwd = pwd->pw_passwd;
+  *gid    = pwd->pw_gid;
+  *gecos  = pwd->pw_gecos;
+  *dir    = pwd->pw_dir;
+  *shell  = pwd->pw_shell;
+
+  return 0;
+}
+
+LIBSTD_HPROTO_IMPL(int, getpwnam, char *name, char **passwd,
+  unsigned int *uid, unsigned int *gid, char **gecos, char **dir, char **shell)
+{
+  struct passwd * pwd = getpwnam(name);
+  
+  if (!pwd)
+    return -1;
+
+  *passwd = pwd->pw_passwd;
+  *uid    = pwd->pw_uid;
+  *gid    = pwd->pw_gid;
+  *gecos  = pwd->pw_gecos;
+  *dir    = pwd->pw_dir;
+  *shell  = pwd->pw_shell;
+
+  return 0;
+}
+
 LIBSTD_HPROTO_IMPL(int, fpclassify, double p0)
 {
     return fpclassify(p0);
diff --git a/libstd/src/_users.c b/libstd/src/_users.c
new file mode 100644
index 00000000000..19eba8aaa74
--- /dev/null
+++ b/libstd/src/_users.c
@@ -0,0 +1,81 @@
+/*
+
+   Copyright (C) 2007-2008 Free Software Foundation, Inc.
+   Contributed by STMicroelectronics
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+
+/* If we are compiling this, we are sure this is to build C-runtime*/
+#define __LIBSTD_CRT_BUILD
+
+#include <__cdefs.h>
+
+#include "__host.h"
+
+#include <unistd.h>
+#include <pwd.h>
+
+/* according to man getpwd, it is safe to reuse this structure */
+static struct passwd pwdbf;
+
+
+LIBSTD_LPROTO_IMPL(uid_t, getuid, void)
+{
+  return LIBSTD_HNAME(getuid)();
+}
+
+LIBSTD_LPROTO_IMPL(uid_t, geteuid, void)
+{
+  return LIBSTD_HNAME(geteuid)();
+}
+
+LIBSTD_LPROTO_IMPL(struct passwd *, getpwuid, uid_t uid)
+{
+  if (LIBSTD_HNAME(getpwuid)(uid, 
+    &(pwdbf.pw_name),
+    &(pwdbf.pw_passwd),
+    &(pwdbf.pw_gid),
+    &(pwdbf.pw_gecos),
+    &(pwdbf.pw_dir),
+    &(pwdbf.pw_shell)) == -1)
+    return NULL;
+
+  pwdbf.pw_uid = uid;
+
+  return &pwdbf; 
+}
+
+LIBSTD_LPROTO_IMPL(struct passwd *, getpwnam, char * uname)
+{
+  if (LIBSTD_HNAME(getpwnam)(uname, 
+    &(pwdbf.pw_passwd),
+    &(pwdbf.pw_uid),
+    &(pwdbf.pw_gid),
+    &(pwdbf.pw_gecos),
+    &(pwdbf.pw_dir),
+    &(pwdbf.pw_shell)) == -1)
+    return NULL;
+
+  pwdbf.pw_name = uname;
+
+  return &pwdbf;
+}
+
+
+
+
diff --git a/libstd/src_opt/MSCorelibWrapper.cs b/libstd/src_opt/MSCorelibWrapper.cs
index 17119d956fd..956967d4dda 100644
--- a/libstd/src_opt/MSCorelibWrapper.cs
+++ b/libstd/src_opt/MSCorelibWrapper.cs
@@ -99,6 +99,20 @@ public class MSCorelibWrapper
 
     [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__errno")]
     unsafe public static extern int* errno();
+    
+    [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__getuid")]
+    public static uint getuid ();
+
+    [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__geteuid")]
+    public static uint geteuid ();
+
+    [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__getpwuid")]
+    unsafe public static int getpwuid (uint uid, sbyte** name, sbyte** passwd,
+                                        uint* gid, sbyte** gecos, sbyte** dir, sbyte** shell);
+
+    [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__getpwnam")]
+    unsafe public static int getpwnam (sbyte* name, sbyte** passwd, uint* uid,
+                                        uint* gid, sbyte** gecos, sbyte** dir, sbyte** shell);
 
     [DllImport("MSCorelibWrapper_support.so", EntryPoint="__host__dbl_epsilon")]
     unsafe public static extern double dbl_epsilon();