diff --git a/newlib/libc/sys/jehanne/Makefile.am b/newlib/libc/sys/jehanne/Makefile.am
index 504c67d31..6c7a79979 100644
--- a/newlib/libc/sys/jehanne/Makefile.am
+++ b/newlib/libc/sys/jehanne/Makefile.am
@@ -5,7 +5,7 @@ AM_CCASFLAGS = $(INCLUDES)
 noinst_LIBRARIES = lib.a
  
 if MAY_SUPPLY_SYSCALLS
-extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o
+extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o ids.o
 else
 extra_objs =
 endif
@@ -14,7 +14,7 @@ lib_a_SOURCES = getenv_r.c getenv.c malloc.c mallocr.c free.c freer.c \
 	calloc.c callocr.c realloc.c reallocr.c
 
 lib_a_LIBADD = $(extra_objs)
-EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c
+EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c ids.c
 lib_a_DEPENDENCIES = $(extra_objs)
 lib_a_CCASFLAGS = $(AM_CCASFLAGS)
 lib_a_CFLAGS = $(AM_CFLAGS)
diff --git a/newlib/libc/sys/jehanne/Makefile.in b/newlib/libc/sys/jehanne/Makefile.in
index eac06959f..3e1378348 100644
--- a/newlib/libc/sys/jehanne/Makefile.in
+++ b/newlib/libc/sys/jehanne/Makefile.in
@@ -52,7 +52,8 @@ LIBRARIES = $(noinst_LIBRARIES)
 ARFLAGS = cru
 lib_a_AR = $(AR) $(ARFLAGS)
 @MAY_SUPPLY_SYSCALLS_TRUE@am__DEPENDENCIES_1 = syscalls.o \
-@MAY_SUPPLY_SYSCALLS_TRUE@	libposix_conf.o chown.o getrusage.o
+@MAY_SUPPLY_SYSCALLS_TRUE@	libposix_conf.o chown.o getrusage.o \
+@MAY_SUPPLY_SYSCALLS_TRUE@	ids.o
 am_lib_a_OBJECTS = lib_a-getenv_r.$(OBJEXT) lib_a-getenv.$(OBJEXT) \
 	lib_a-malloc.$(OBJEXT) lib_a-mallocr.$(OBJEXT) \
 	lib_a-free.$(OBJEXT) lib_a-freer.$(OBJEXT) \
@@ -177,12 +178,12 @@ INCLUDES = $(NEWLIB_CFLAGS) $(CROSS_CFLAGS) $(TARGET_CFLAGS)
 AM_CCASFLAGS = $(INCLUDES)
 noinst_LIBRARIES = lib.a
 @MAY_SUPPLY_SYSCALLS_FALSE@extra_objs = 
-@MAY_SUPPLY_SYSCALLS_TRUE@extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o
+@MAY_SUPPLY_SYSCALLS_TRUE@extra_objs = syscalls.o libposix_conf.o chown.o getrusage.o ids.o
 lib_a_SOURCES = getenv_r.c getenv.c malloc.c mallocr.c free.c freer.c \
 	calloc.c callocr.c realloc.c reallocr.c
 
 lib_a_LIBADD = $(extra_objs)
-EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c
+EXTRA_lib_a_SOURCES = libposix_conf.c syscalls.c chown.c getrusage.c ids.c
 lib_a_DEPENDENCIES = $(extra_objs)
 lib_a_CCASFLAGS = $(AM_CCASFLAGS)
 lib_a_CFLAGS = $(AM_CFLAGS)
@@ -334,6 +335,12 @@ lib_a-getrusage.o: getrusage.c
 lib_a-getrusage.obj: getrusage.c
 	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-getrusage.obj `if test -f 'getrusage.c'; then $(CYGPATH_W) 'getrusage.c'; else $(CYGPATH_W) '$(srcdir)/getrusage.c'; fi`
 
+lib_a-ids.o: ids.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-ids.o `test -f 'ids.c' || echo '$(srcdir)/'`ids.c
+
+lib_a-ids.obj: ids.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-ids.obj `if test -f 'ids.c'; then $(CYGPATH_W) 'ids.c'; else $(CYGPATH_W) '$(srcdir)/ids.c'; fi`
+
 ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
 	list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
 	unique=`for i in $$list; do \
diff --git a/newlib/libc/sys/jehanne/ids.c b/newlib/libc/sys/jehanne/ids.c
new file mode 100644
index 000000000..85f12ea1b
--- /dev/null
+++ b/newlib/libc/sys/jehanne/ids.c
@@ -0,0 +1,114 @@
+/*
+ * This file is part of Jehanne.
+ *
+ * Copyright (C) 2017 Giacomo Tesio <giacomo@tesio.it>
+ *
+ * Jehanne 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, version 2 of the License.
+ *
+ * Jehanne 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 Jehanne.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <u.h>
+#include <libc.h>
+#include <posix.h>
+#include <reent.h>
+
+typedef int uid_t;
+typedef int gid_t;
+
+uid_t
+getuid(void)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_getuid(errnop);
+}
+
+uid_t
+geteuid(void)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_geteuid(errnop);
+}
+
+int
+setuid(uid_t uid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setuid(errnop, uid);
+}
+
+int
+seteuid(uid_t euid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_seteuid(errnop, euid);
+}
+
+int
+setreuid(uid_t ruid, uid_t euid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setreuid(errnop, ruid, euid);
+}
+
+gid_t
+getgid(void)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_getgid(errnop);
+}
+
+gid_t
+getegid(void)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_getegid(errnop);
+}
+
+int
+setgid(gid_t gid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setgid(errnop, gid);
+}
+
+int
+setegid(gid_t egid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setgid(errnop, egid);
+}
+
+int
+setregid(gid_t rgid, gid_t egid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setregid(errnop, rgid, egid);
+}
+
+int setpgid(pid_t pid, pid_t pgid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setpgid(errnop, pid, pgid);
+}
+
+pid_t
+getsid(pid_t pid)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_getsid(errnop, pid);
+}
+
+pid_t
+setsid(void)
+{
+	int *errnop = &_REENT->_errno;
+	return POSIX_setsid(errnop);
+}