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, 200 insertions, 0 deletions

diff --git a/REORG.TODO/hurd/xattr.c b/REORG.TODO/hurd/xattr.c
new file mode 100644
index 0000000000..7deef291b4
--- /dev/null
+++ b/REORG.TODO/hurd/xattr.c
@@ -0,0 +1,200 @@
+/* Support for *xattr interfaces on GNU/Hurd.
+   Copyright (C) 2006-2017 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 <hurd.h>
+#include <hurd/xattr.h>
+#include <string.h>
+#include <sys/mman.h>
+
+/* Right now we support only a fixed set of xattr names for Hurd features.
+   There are no RPC interfaces for free-form xattr names and values.
+
+   Name			Value encoding
+   ----			----- --------
+   gnu.author		empty if st_author==st_uid
+			uid_t giving st_author value
+   gnu.translator	empty if no passive translator
+			translator and arguments: "/hurd/foo\0arg1\0arg2\0"
+*/
+
+error_t
+_hurd_xattr_get (io_t port, const char *name, void *value, size_t *size)
+{
+  if (strncmp (name, "gnu.", 4))
+    return EOPNOTSUPP;
+  name += 4;
+
+  if (!strcmp (name, "author"))
+    {
+      struct stat64 st;
+      error_t err = __io_stat (port, &st);
+      if (err)
+	return err;
+      if (st.st_author == st.st_uid)
+	*size = 0;
+      else if (value)
+	{
+	  if (*size < sizeof st.st_author)
+	    return ERANGE;
+	  memcpy (value, &st.st_author, sizeof st.st_author);
+	}
+      *size = sizeof st.st_author;
+      return 0;
+    }
+
+  if (!strcmp (name, "translator"))
+    {
+      char *buf = value;
+      size_t bufsz = value ? *size : 0;
+      error_t err = __file_get_translator (port, &buf, &bufsz);
+      if (err)
+	return err;
+      if (value != NULL && *size < bufsz)
+	{
+	  if (buf != value)
+	    munmap (buf, bufsz);
+	  return -ERANGE;
+	}
+      if (buf != value && bufsz > 0)
+	{
+	  if (value != NULL)
+	    memcpy (value, buf, bufsz);
+	  munmap (buf, bufsz);
+	}
+      *size = bufsz;
+      return 0;
+    }
+
+  return EOPNOTSUPP;
+}
+
+error_t
+_hurd_xattr_set (io_t port, const char *name, const void *value, size_t size,
+		 int flags)
+{
+  if (strncmp (name, "gnu.", 4))
+    return EOPNOTSUPP;
+  name += 4;
+
+  if (!strcmp (name, "author"))
+    switch (size)
+      {
+      default:
+	return EINVAL;
+      case 0:			/* "Clear" author by setting to st_uid. */
+	{
+	  struct stat64 st;
+	  error_t err = __io_stat (port, &st);
+	  if (err)
+	    return err;
+	  if (st.st_author == st.st_uid)
+	    {
+	      /* Nothing to do.  */
+	      if (flags & XATTR_REPLACE)
+		return ENODATA;
+	      return 0;
+	    }
+	  if (flags & XATTR_CREATE)
+	    return EEXIST;
+	  return __file_chauthor (port, st.st_uid);
+	}
+      case sizeof (uid_t):	/* Set the author.  */
+	{
+	  uid_t id;
+	  memcpy (&id, value, sizeof id);
+	  if (flags & (XATTR_CREATE|XATTR_REPLACE))
+	    {
+	      struct stat64 st;
+	      error_t err = __io_stat (port, &st);
+	      if (err)
+		return err;
+	      if (st.st_author == st.st_uid)
+		{
+		  if (flags & XATTR_REPLACE)
+		    return ENODATA;
+		}
+	      else if (flags & XATTR_CREATE)
+		return EEXIST;
+	      if (st.st_author == id)
+		/* Nothing to do.  */
+		return 0;
+	    }
+	  return __file_chauthor (port, id);
+	}
+      }
+
+  if (!strcmp (name, "translator"))
+    {
+      if (flags & XATTR_REPLACE)
+	{
+	  /* Must make sure it's already there.  */
+	  char *buf = NULL;
+	  size_t bufsz = 0;
+	  error_t err = __file_get_translator (port, &buf, &bufsz);
+	  if (err)
+	    return err;
+	  if (bufsz > 0)
+	    {
+	      munmap (buf, bufsz);
+	      return ENODATA;
+	    }
+	}
+      return __file_set_translator (port,
+				    FS_TRANS_SET | ((flags & XATTR_CREATE)
+						    ? FS_TRANS_EXCL : 0), 0, 0,
+				    value, size,
+				    MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);
+    }
+
+  return EOPNOTSUPP;
+}
+
+error_t
+_hurd_xattr_remove (io_t port, const char *name)
+{
+  return _hurd_xattr_set (port, name, NULL, 0, XATTR_REPLACE);
+}
+
+error_t
+_hurd_xattr_list (io_t port, void *buffer, size_t *size)
+{
+  size_t total = 0;
+  char *bufp = buffer;
+  inline void add (const char *name, size_t len)
+    {
+      total += len;
+      if (bufp != NULL && total <= *size)
+	bufp = __mempcpy (bufp, name, len);
+    }
+#define add(s) add (s, sizeof s)
+
+  struct stat64 st;
+  error_t err = __io_stat (port, &st);
+  if (err)
+    return err;
+
+  if (st.st_author != st.st_uid)
+    add ("gnu.author");
+  if (st.st_mode & S_IPTRANS)
+    add ("gnu.translator");
+
+  if (buffer != NULL && total > *size)
+    return ERANGE;
+  *size = total;
+  return 0;
+}