Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 173 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/mach/hurd/access.c b/REORG.TODO/sysdeps/mach/hurd/access.c
new file mode 100644
index 0000000000..185e000c9d
--- /dev/null
+++ b/REORG.TODO/sysdeps/mach/hurd/access.c
@@ -0,0 +1,173 @@
+/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <hurd.h>
+#include <hurd/port.h>
+#include <hurd/id.h>
+#include <hurd/lookup.h>
+#include <fcntl.h>
+
+static int
+hurd_fail_seterrno (error_t err)
+{
+  return __hurd_fail (err);
+}
+
+static int
+hurd_fail_noerrno (error_t err)
+{
+  return -1;
+}
+
+static int
+access_common (const char *file, int type, int (*errfunc) (error_t))
+{
+  error_t err;
+  file_t rcrdir, rcwdir, io;
+  int flags, allowed;
+
+  error_t reauthenticate (int which, file_t *result)
+    {
+      /* Get a port to our root directory, authenticated with the real IDs.  */
+      error_t err;
+      mach_port_t ref;
+      ref = __mach_reply_port ();
+      err = HURD_PORT_USE
+	(&_hurd_ports[which],
+	 ({
+	   err = __io_reauthenticate (port, ref, MACH_MSG_TYPE_MAKE_SEND);
+	   if (!err)
+	     err = __auth_user_authenticate (_hurd_id.rid_auth,
+					     ref, MACH_MSG_TYPE_MAKE_SEND,
+					     result);
+	   err;
+	 }));
+      __mach_port_destroy (__mach_task_self (), ref);
+      return err;
+    }
+
+  error_t init_port (int which, error_t (*operate) (mach_port_t))
+    {
+      switch (which)
+	{
+	case INIT_PORT_AUTH:
+	  return (*operate) (_hurd_id.rid_auth);
+	case INIT_PORT_CRDIR:
+	  return (reauthenticate (INIT_PORT_CRDIR, &rcrdir) ?:
+		  (*operate) (rcrdir));
+	case INIT_PORT_CWDIR:
+	  return (reauthenticate (INIT_PORT_CWDIR, &rcwdir) ?:
+		  (*operate) (rcwdir));
+	default:
+	  return _hurd_ports_use (which, operate);
+	}
+    }
+
+  rcrdir = rcwdir = MACH_PORT_NULL;
+
+  HURD_CRITICAL_BEGIN;
+
+  __mutex_lock (&_hurd_id.lock);
+  /* Get _hurd_id up to date.  */
+  if (err = _hurd_check_ids ())
+    goto lose;
+
+  if (_hurd_id.rid_auth == MACH_PORT_NULL)
+    {
+      /* Set up _hurd_id.rid_auth.  This is a special auth server port
+	 which uses the real uid and gid (the first aux uid and gid) as
+	 the only effective uid and gid.  */
+
+      if (_hurd_id.aux.nuids < 1 || _hurd_id.aux.ngids < 1)
+	{
+	  /* We do not have a real UID and GID.  Lose, lose, lose!  */
+	  err = EGRATUITOUS;
+	  goto lose;
+	}
+
+      /* Create a new auth port using our real UID and GID (the first
+	 auxiliary UID and GID) as the only effective IDs.  */
+      if (err = __USEPORT (AUTH,
+			   __auth_makeauth (port,
+					    NULL, MACH_MSG_TYPE_COPY_SEND, 0,
+					    _hurd_id.aux.uids, 1,
+					    _hurd_id.aux.uids,
+					    _hurd_id.aux.nuids,
+					    _hurd_id.aux.gids, 1,
+					    _hurd_id.aux.gids,
+					    _hurd_id.aux.ngids,
+					    &_hurd_id.rid_auth)))
+	goto lose;
+    }
+
+  if (!err)
+    /* Look up the file name using the modified init ports.  */
+    err = __hurd_file_name_lookup (&init_port, &__getdport, 0,
+				   file, 0, 0, &io);
+
+  /* We are done with _hurd_id.rid_auth now.  */
+ lose:
+  __mutex_unlock (&_hurd_id.lock);
+
+  HURD_CRITICAL_END;
+
+  if (rcrdir != MACH_PORT_NULL)
+    __mach_port_deallocate (__mach_task_self (), rcrdir);
+  if (rcwdir != MACH_PORT_NULL)
+    __mach_port_deallocate (__mach_task_self (), rcwdir);
+  if (err)
+    return errfunc (err);
+
+  /* Find out what types of access we are allowed to this file.  */
+  err = __file_check_access (io, &allowed);
+  __mach_port_deallocate (__mach_task_self (), io);
+  if (err)
+    return errfunc (err);
+
+  flags = 0;
+  if (type & R_OK)
+    flags |= O_READ;
+  if (type & W_OK)
+    flags |= O_WRITE;
+  if (type & X_OK)
+    flags |= O_EXEC;
+
+  if (flags & ~allowed)
+    /* We are not allowed all the requested types of access.  */
+    return errfunc (EACCES);
+
+  return 0;
+}
+
+/* Test for access to FILE by our real user and group IDs without setting
+   errno.  This may be unsafe to run during initialization of tunables
+   since access_common calls __hurd_file_name_lookup, which calls
+   __hurd_file_name_lookup_retry, which can set errno.  */
+int
+__access_noerrno (const char *file, int type)
+{
+  return access_common (file, type, hurd_fail_noerrno);
+}
+
+/* Test for access to FILE by our real user and group IDs.  */
+int
+__access (const char *file, int type)
+{
+  return access_common (file, type, hurd_fail_seterrno);
+}
+weak_alias (__access, access)