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, 143 insertions, 0 deletions

diff --git a/REORG.TODO/login/login.c b/REORG.TODO/login/login.c
new file mode 100644
index 0000000000..b8171de83c
--- /dev/null
+++ b/REORG.TODO/login/login.c
@@ -0,0 +1,143 @@
+/* Copyright (C) 1996-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   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 <assert.h>
+#include <errno.h>
+#include <limits.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <utmp.h>
+
+
+/* Return the result of ttyname in the buffer pointed to by TTY, which should
+   be of length BUF_LEN.  If it is too long to fit in this buffer, a
+   sufficiently long buffer is allocated using malloc, and returned in TTY.
+   0 is returned upon success, -1 otherwise.  */
+static int
+tty_name (int fd, char **tty, size_t buf_len)
+{
+  int rv;			/* Return value.  0 = success.  */
+  char *buf = *tty;		/* Buffer for ttyname, initially the user's. */
+
+  for (;;)
+    {
+      char *new_buf;
+
+      if (buf_len)
+	{
+	  rv = ttyname_r (fd, buf, buf_len);
+
+	  if (rv != 0 || memchr (buf, '\0', buf_len))
+	    /* We either got an error, or we succeeded and the
+	       returned name fit in the buffer.  */
+	    break;
+
+	  /* Try again with a longer buffer.  */
+	  buf_len += buf_len;	/* Double it */
+	}
+      else
+	/* No initial buffer; start out by mallocing one.  */
+	buf_len = 128;		/* First time guess.  */
+
+      if (buf != *tty)
+	/* We've already malloced another buffer at least once.  */
+	new_buf = realloc (buf, buf_len);
+      else
+	new_buf = malloc (buf_len);
+      if (! new_buf)
+	{
+	  rv = -1;
+	  __set_errno (ENOMEM);
+	  break;
+	}
+      buf = new_buf;
+    }
+
+  if (rv == 0)
+    *tty = buf;		/* Return buffer to the user.  */
+  else if (buf != *tty)
+    free (buf);		/* Free what we malloced when returning an error.  */
+
+  return rv;
+}
+
+void
+login (const struct utmp *ut)
+{
+#ifdef PATH_MAX
+  char _tty[PATH_MAX + UT_LINESIZE];
+#else
+  char _tty[512 + UT_LINESIZE];
+#endif
+  char *tty = _tty;
+  int found_tty;
+  const char *ttyp;
+  struct utmp copy = *ut;
+
+  /* Fill in those fields we supply.  */
+#if _HAVE_UT_TYPE - 0
+  copy.ut_type = USER_PROCESS;
+#endif
+#if _HAVE_UT_PID - 0
+  copy.ut_pid = getpid ();
+#endif
+
+  /* Seek tty.  */
+  found_tty = tty_name (STDIN_FILENO, &tty, sizeof (_tty));
+  if (found_tty < 0)
+    found_tty = tty_name (STDOUT_FILENO, &tty, sizeof (_tty));
+  if (found_tty < 0)
+    found_tty = tty_name (STDERR_FILENO, &tty, sizeof (_tty));
+
+  if (found_tty >= 0)
+    {
+      /* We only want to insert the name of the tty without path.
+	 But take care of name like /dev/pts/3.  */
+      if (strncmp (tty, "/dev/", 5) == 0)
+	ttyp = tty + 5;		/* Skip the "/dev/".  */
+      else
+	ttyp = basename (tty);
+
+      /* Position to record for this tty.  */
+      strncpy (copy.ut_line, ttyp, UT_LINESIZE);
+
+      /* Tell that we want to use the UTMP file.  */
+      if (utmpname (_PATH_UTMP) == 0)
+	{
+	  /* Open UTMP file.  */
+	  setutent ();
+
+	  /* Write the entry.  */
+	  pututline (&copy);
+
+	  /* Close UTMP file.  */
+	  endutent ();
+	}
+
+      if (tty != _tty)
+	free (tty);		/* Free buffer malloced by tty_name.  */
+    }
+  else
+    /* We provide a default value so that the output does not contain
+       an random bytes in this field.  */
+    strncpy (copy.ut_line, "???", UT_LINESIZE);
+
+  /* Update the WTMP file.  Here we have to add a new entry.  */
+  updwtmp (_PATH_WTMP, &copy);
+}