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, 118 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/gethostid.c b/REORG.TODO/sysdeps/unix/sysv/linux/gethostid.c
new file mode 100644
index 0000000000..cc108aa2d6
--- /dev/null
+++ b/REORG.TODO/sysdeps/unix/sysv/linux/gethostid.c
@@ -0,0 +1,118 @@
+/* Copyright (C) 1995-2017 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 <alloca.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <not-cancel.h>
+
+#define HOSTIDFILE "/etc/hostid"
+
+#ifdef SET_PROCEDURE
+int
+sethostid (long int id)
+{
+  int fd;
+  ssize_t written;
+  int32_t id32 = id;
+
+  /* Test for appropriate rights to set host ID.  */
+  if (__libc_enable_secure)
+    {
+      __set_errno (EPERM);
+      return -1;
+    }
+
+  /* Make sure the ID is not too large.  Needed for bi-arch support.   */
+  if (id32 != id)
+    {
+      __set_errno (EOVERFLOW);
+      return -1;
+    }
+
+  /* Open file for writing.  Everybody is allowed to read this file.  */
+  fd = open_not_cancel (HOSTIDFILE, O_CREAT|O_WRONLY|O_TRUNC, 0644);
+  if (fd < 0)
+    return -1;
+
+  written = write_not_cancel (fd, &id32, sizeof (id32));
+
+  close_not_cancel_no_status (fd);
+
+  return written != sizeof (id32) ? -1 : 0;
+}
+
+#else
+# include <string.h>
+# include <sys/param.h>
+# include <resolv/netdb.h>
+# include <netinet/in.h>
+
+long int
+gethostid (void)
+{
+  char hostname[MAXHOSTNAMELEN + 1];
+  size_t buflen;
+  char *buffer;
+  struct hostent hostbuf, *hp;
+  int32_t id;
+  struct in_addr in;
+  int herr;
+  int fd;
+
+  /* First try to get the ID from a former invocation of sethostid.  */
+  fd = open_not_cancel (HOSTIDFILE, O_RDONLY|O_LARGEFILE, 0);
+  if (fd >= 0)
+    {
+      ssize_t n = read_not_cancel (fd, &id, sizeof (id));
+
+      close_not_cancel_no_status (fd);
+
+      if (n == sizeof (id))
+	return id;
+    }
+
+  /* Getting from the file was not successful.  An intelligent guess for
+     a unique number of a host is its IP address.  Return this.  */
+  if (__gethostname (hostname, MAXHOSTNAMELEN) < 0 || hostname[0] == '\0')
+    /* This also fails.  Return and arbitrary value.  */
+    return 0;
+
+  buflen = 1024;
+  buffer = __alloca (buflen);
+
+  /* To get the IP address we need to know the host name.  */
+  while (__gethostbyname_r (hostname, &hostbuf, buffer, buflen, &hp, &herr)
+	 != 0
+	 || hp == NULL)
+    if (herr != NETDB_INTERNAL || errno != ERANGE)
+      return 0;
+    else
+      /* Enlarge buffer.  */
+      buffer = extend_alloca (buffer, buflen, 2 * buflen);
+
+  in.s_addr = 0;
+  memcpy (&in, hp->h_addr,
+	  (int) sizeof (in) < hp->h_length ? (int) sizeof (in) : hp->h_length);
+
+  /* For the return value to be not exactly the IP address we do some
+     bit fiddling.  */
+  return (int32_t) (in.s_addr << 16 | in.s_addr >> 16);
+}
+#endif