upip: Update dependency modules.

upip/Makefile

@@ -4,12 +4,12 @@ all:
 # self-contained install
 deps: upip__libc.py upip_os.py upip_os_path.py upip_errno.py upip_gzip.py upip_stat.py upip_utarfile.py
 
-upip__libc.py: ../_libc/_libc.py
+upip_ffilib.py: ../ffilib/ffilib.py
 	cp $^ $@
 upip_os.py: ../os/os/__init__.py
-	sed -r -e 's/((_libc|errno|stat)([^_"]|$$))/upip_\1/' $^ >$@
+	sed -r -e 's/((ffilib|errno|stat)([^_"]|$$))/upip_\1/' $^ >$@
 upip_os_path.py: ../os.path/os/path.py
-	sed -r -e 's/((_libc|errno|os|stat)([^_"]|$$))/upip_\1/' $^ >$@
+	sed -r -e 's/((ffilib|errno|os|stat)([^_"]|$$))/upip_\1/' $^ >$@
 upip_errno.py: ../errno/errno.py
 	cp $^ $@
 upip_gzip.py: ../gzip/gzip.py

upip/upip_os.py

@@ -3,16 +3,30 @@ import array
 import ustruct as struct
 import upip_errno
 import upip_stat as stat_
-import upip__libc
+import upip_ffilib
 try:
     from _os import *
 except:
     pass
 
 
-libc = upip__libc.get()
+libc = upip_ffilib.libc()
+
+try:
+    errno__ = libc.var("i", "errno")
+    def errno_(val=None):
+        if val is None:
+            return errno__.get()
+        errno__.set(val)
+except OSError:
+    __upip_errno = libc.func("p", "__errno", "")
+    def errno_(val=None):
+        if val is None:
+            p = __upip_errno()
+            buf = ffi.as_bytearray(p, 4)
+            return int.from_bytes(buf)
+        raise NotImplementedError
 
-errno_ = libc.var("i", "errno")
 chdir_ = libc.func("i", "chdir", "s")
 mkdir_ = libc.func("i", "mkdir", "si")
 rename_ = libc.func("i", "rename", "ss")
@@ -62,7 +76,7 @@ def check_error(ret):
     # Return True is error was EINTR (which usually means that OS call
     # should be restarted).
     if ret == -1:
-        e = errno_.get()
+        e = errno_()
         if e == upip_errno.EINTR:
             return True
         raise OSError(e)
@@ -223,5 +237,6 @@ def fsdecode(s):
 
 
 def urandom(n):
-    with open("/dev/urandom", "rb") as f:
+    import builtins
+    with builtins.open("/dev/urandom", "rb") as f:
         return f.read(n)

upip/upip_os_path.py

@@ -8,7 +8,9 @@ def normpath(s):
     return s
 
 def abspath(s):
+    if s[0] != "/":
         return upip_os.getcwd() + "/" + s
+    return s
 
 def join(*args):
     # TODO: this is non-compliant