1 files changed, 344 insertions, 0 deletions
diff --git a/REORG.TODO/elf/pldd.c b/REORG.TODO/elf/pldd.c
new file mode 100644
index 0000000000..ddfa88d63b
--- /dev/null
+++ b/REORG.TODO/elf/pldd.c
@@ -0,0 +1,344 @@
+/* List dynamic shared objects linked into given process.
+   Copyright (C) 2011-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
+
+   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 <argp.h>
+#include <assert.h>
+#include <dirent.h>
+#include <elf.h>
+#include <errno.h>
+#include <error.h>
+#include <fcntl.h>
+#include <libintl.h>
+#include <link.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ptrace.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <scratch_buffer.h>
+
+#include <ldsodefs.h>
+#include <version.h>
+
+/* Global variables.  */
+extern char *program_invocation_short_name;
+#define PACKAGE _libc_intl_domainname
+
+/* External functions.  */
+#include <programs/xmalloc.h>
+
+/* Name and version of program.  */
+static void print_version (FILE *stream, struct argp_state *state);
+void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version;
+
+/* Function to print some extra text in the help message.  */
+static char *more_help (int key, const char *text, void *input);
+
+/* Definitions of arguments for argp functions.  */
+static const struct argp_option options[] =
+{
+  { NULL, 0, NULL, 0, NULL }
+};
+
+/* Short description of program.  */
+static const char doc[] = N_("\
+List dynamic shared objects loaded into process.");
+
+/* Strings for arguments in help texts.  */
+static const char args_doc[] = N_("PID");
+
+/* Prototype for option handler.  */
+static error_t parse_opt (int key, char *arg, struct argp_state *state);
+
+/* Data structure to communicate with argp functions.  */
+static struct argp argp =
+{
+  options, parse_opt, args_doc, doc, NULL, more_help, NULL
+};
+
+// File descriptor of /proc/*/mem file.
+static int memfd;
+
+/* Name of the executable  */
+static char *exe;
+
+/* Local functions.  */
+static int get_process_info (int dfd, long int pid);
+static void wait_for_ptrace_stop (long int pid);
+
+
+int
+main (int argc, char *argv[])
+{
+  /* Parse and process arguments.  */
+  int remaining;
+  argp_parse (&argp, argc, argv, 0, &remaining, NULL);
+
+  if (remaining != argc - 1)
+    {
+      fprintf (stderr,
+	       gettext ("Exactly one parameter with process ID required.\n"));
+      argp_help (&argp, stderr, ARGP_HELP_SEE, program_invocation_short_name);
+      return 1;
+    }
+
+  assert (sizeof (pid_t) == sizeof (int)
+	  || sizeof (pid_t) == sizeof (long int));
+  char *endp;
+  errno = 0;
+  long int pid = strtol (argv[remaining], &endp, 10);
+  if (pid < 0 || (pid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
+      || (sizeof (pid_t) < sizeof (pid) && pid > INT_MAX))
+    error (EXIT_FAILURE, 0, gettext ("invalid process ID '%s'"),
+	   argv[remaining]);
+
+  /* Determine the program name.  */
+  char buf[7 + 3 * sizeof (pid)];
+  snprintf (buf, sizeof (buf), "/proc/%lu", pid);
+  int dfd = open (buf, O_RDONLY | O_DIRECTORY);
+  if (dfd == -1)
+    error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf);
+
+  struct scratch_buffer exebuf;
+  scratch_buffer_init (&exebuf);
+  ssize_t nexe;
+  while ((nexe = readlinkat (dfd, "exe",
+			     exebuf.data, exebuf.length)) == exebuf.length)
+    {
+      if (!scratch_buffer_grow (&exebuf))
+	{
+	  nexe = -1;
+	  break;
+	}
+    }
+  if (nexe == -1)
+    exe = (char *) "<program name undetermined>";
+  else
+    {
+      exe = exebuf.data;
+      exe[nexe] = '\0';
+    }
+
+  /* Stop all threads since otherwise the list of loaded modules might
+     change while we are reading it.  */
+  struct thread_list
+  {
+    pid_t tid;
+    struct thread_list *next;
+  } *thread_list = NULL;
+
+  int taskfd = openat (dfd, "task", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  if (taskfd == 1)
+    error (EXIT_FAILURE, errno, gettext ("cannot open %s/task"), buf);
+  DIR *dir = fdopendir (taskfd);
+  if (dir == NULL)
+    error (EXIT_FAILURE, errno, gettext ("cannot prepare reading %s/task"),
+	   buf);
+
+  struct dirent64 *d;
+  while ((d = readdir64 (dir)) != NULL)
+    {
+      if (! isdigit (d->d_name[0]))
+	continue;
+
+      errno = 0;
+      long int tid = strtol (d->d_name, &endp, 10);
+      if (tid < 0 || (tid == ULONG_MAX && errno == ERANGE) || *endp != '\0'
+	  || (sizeof (pid_t) < sizeof (pid) && tid > INT_MAX))
+	error (EXIT_FAILURE, 0, gettext ("invalid thread ID '%s'"),
+	       d->d_name);
+
+      if (ptrace (PTRACE_ATTACH, tid, NULL, NULL) != 0)
+	{
+	  /* There might be a race between reading the directory and
+	     threads terminating.  Ignore errors attaching to unknown
+	     threads unless this is the main thread.  */
+	  if (errno == ESRCH && tid != pid)
+	    continue;
+
+	  error (EXIT_FAILURE, errno, gettext ("cannot attach to process %lu"),
+		 tid);
+	}
+
+      wait_for_ptrace_stop (tid);
+
+      struct thread_list *newp = alloca (sizeof (*newp));
+      newp->tid = tid;
+      newp->next = thread_list;
+      thread_list = newp;
+    }
+
+  closedir (dir);
+
+  int status = get_process_info (dfd, pid);
+
+  assert (thread_list != NULL);
+  do
+    {
+      ptrace (PTRACE_DETACH, thread_list->tid, NULL, NULL);
+      thread_list = thread_list->next;
+    }
+  while (thread_list != NULL);
+
+  close (dfd);
+
+  return status;
+}
+
+
+/* Wait for PID to enter ptrace-stop state after being attached.  */
+static void
+wait_for_ptrace_stop (long int pid)
+{
+  int status;
+
+  /* While waiting for SIGSTOP being delivered to the tracee we have to
+     reinject any other pending signal.  Ignore all other errors.  */
+  while (waitpid (pid, &status, __WALL) == pid && WIFSTOPPED (status))
+    {
+      /* The STOP signal should not be delivered to the tracee.  */
+      if (WSTOPSIG (status) == SIGSTOP)
+	return;
+      if (ptrace (PTRACE_CONT, pid, NULL,
+		  (void *) (uintptr_t) WSTOPSIG (status)))
+	/* The only possible error is that the process died.  */
+	return;
+    }
+}
+
+
+/* Handle program arguments.  */
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+  switch (key)
+    {
+    default:
+      return ARGP_ERR_UNKNOWN;
+    }
+  return 0;
+}
+
+
+/* Print bug-reporting information in the help message.  */
+static char *
+more_help (int key, const char *text, void *input)
+{
+  char *tp = NULL;
+  switch (key)
+    {
+    case ARGP_KEY_HELP_EXTRA:
+      /* We print some extra information.  */
+      if (asprintf (&tp, gettext ("\
+For bug reporting instructions, please see:\n\
+%s.\n"), REPORT_BUGS_TO) < 0)
+	return NULL;
+      return tp;
+    default:
+      break;
+    }
+  return (char *) text;
+}
+
+/* Print the version information.  */
+static void
+print_version (FILE *stream, struct argp_state *state)
+{
+  fprintf (stream, "pldd %s%s\n", PKGVERSION, VERSION);
+  fprintf (stream, gettext ("\
+Copyright (C) %s Free Software Foundation, Inc.\n\
+This is free software; see the source for copying conditions.  There is NO\n\
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
+"), "2017");
+  fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
+}
+
+
+#define CLASS 32
+#include "pldd-xx.c"
+#define CLASS 64
+#include "pldd-xx.c"
+
+
+static int
+get_process_info (int dfd, long int pid)
+{
+  memfd = openat (dfd, "mem", O_RDONLY);
+  if (memfd == -1)
+    goto no_info;
+
+  int fd = openat (dfd, "exe", O_RDONLY);
+  if (fd == -1)
+    {
+    no_info:
+      error (0, errno, gettext ("cannot get information about process %lu"),
+	     pid);
+      return EXIT_FAILURE;
+    }
+
+  char e_ident[EI_NIDENT];
+  if (read (fd, e_ident, EI_NIDENT) != EI_NIDENT)
+    goto no_info;
+
+  close (fd);
+
+  if (memcmp (e_ident, ELFMAG, SELFMAG) != 0)
+    {
+      error (0, 0, gettext ("process %lu is no ELF program"), pid);
+      return EXIT_FAILURE;
+    }
+
+  fd = openat (dfd, "auxv", O_RDONLY);
+  if (fd == -1)
+    goto no_info;
+
+  size_t auxv_size = 0;
+  void *auxv = NULL;
+  while (1)
+    {
+      auxv_size += 512;
+      auxv = xrealloc (auxv, auxv_size);
+
+      ssize_t n = pread (fd, auxv, auxv_size, 0);
+      if (n < 0)
+	goto no_info;
+      if (n < auxv_size)
+	{
+	  auxv_size = n;
+	  break;
+	}
+    }
+
+  close (fd);
+
+  int retval;
+  if (e_ident[EI_CLASS] == ELFCLASS32)
+    retval = find_maps32 (pid, auxv, auxv_size);
+  else
+    retval = find_maps64 (pid, auxv, auxv_size);
+
+  free (auxv);
+  close (memfd);
+
+  return retval;
+}