1 files changed, 161 insertions, 0 deletions
diff --git a/gcc-4.9/libvtv/vtv_utils.cc b/gcc-4.9/libvtv/vtv_utils.cc
new file mode 100644
index 000000000..9cf4b08dc
--- /dev/null
+++ b/gcc-4.9/libvtv/vtv_utils.cc
@@ -0,0 +1,161 @@
+/* Copyright (C) 2012-2013
+   Free Software Foundation
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC 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 General Public License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file is part of the vtable verication runtime library (see
+   comments in vtv_rts.cc for more information about vtable
+   verification).  This file contains log file utilities.  */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <execinfo.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "vtv_utils.h"
+
+#ifndef HAVE_SECURE_GETENV
+#  ifdef HAVE___SECURE_GETENV
+#    define secure_getenv __secure_getenv
+#  else
+#    define secure_getenv getenv
+#  endif
+#endif
+
+static int vtv_failures_log_fd = -1;
+
+/* This function takes the NAME of a log file to open, attempts to
+   open it in the logs_dir directory, and returns the resulting file
+   descriptor.
+
+   This function first checks to see if the user has specifed (via
+   the environment variable VTV_LOGS_DIR) a directory to use for the
+   vtable verification logs.  If that fails, the function will open
+   the logs in the current directory.
+*/
+
+int
+__vtv_open_log (const char *name)
+{
+  char log_name[1024];
+  char log_dir[512];
+  uid_t user_id = getuid ();
+  pid_t process_id = getpid ();
+  char *logs_prefix;
+  bool logs_dir_specified = false;
+  int fd = -1;
+
+  logs_prefix = secure_getenv ("VTV_LOGS_DIR");
+  if (logs_prefix && strlen (logs_prefix) > 0)
+    {
+      logs_dir_specified = true;
+      mkdir (logs_prefix, S_IRWXU);
+      snprintf (log_dir, sizeof (log_dir), "%s/vtv_logs", logs_prefix);
+      mkdir (log_dir, S_IRWXU);
+
+      snprintf (log_name, sizeof (log_name), "%s/%d_%d_%s", log_dir,
+		(unsigned) user_id, (unsigned) process_id, name);
+      fd = open (log_name, O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW,
+		 S_IRWXU);
+    }
+  else
+    fd = dup (2);
+
+  if (fd == -1)
+    __vtv_add_to_log (2, "Cannot open log file %s %s\n", name,
+                    strerror (errno));
+  return fd;
+}
+
+/* This function takes a file descriptor (FD) and a string (STR) and
+   tries to write the string to the file.  */
+
+static int
+vtv_log_write (int fd, const char *str)
+{
+  if (write (fd, str, strlen (str)) != -1)
+    return 0;
+
+  if (fd != 2) /* Make sure we dont get in a loop.  */
+    __vtv_add_to_log (2, "Error writing to log: %s\n", strerror (errno));
+  return -1;
+}
+
+
+/* This function takes a file decriptor (LOG_FILE) and an output
+ format string (FORMAT), followed by zero or more print format
+ arguments (the same as fprintf, for example).  It gets the current
+ process ID and PPID, pre-pends them to the formatted message, and
+ writes write it out to the log file referenced by LOG_FILE via calles
+ to vtv_log_write.  */
+
+int
+__vtv_add_to_log (int log_file, const char * format, ...)
+{
+  /* We dont want to dynamically allocate this buffer. This should be
+     more than enough in most cases. It if isn't we are careful not to
+     do a buffer overflow.  */
+  char output[1024];
+
+  va_list ap;
+  va_start (ap, format);
+
+  snprintf (output, sizeof (output), "VTV: PID=%d PPID=%d ", getpid (),
+            getppid ());
+  vtv_log_write (log_file, output);
+  vsnprintf (output, sizeof (output), format, ap);
+  vtv_log_write (log_file, output);
+  va_end (ap);
+
+  return 0;
+}
+
+/* Open error logging file, if not already open, and write vtable
+   verification failure messages (LOG_MSG) to the log file.  Also
+   generate a backtrace in the log file, if GENERATE_BACKTRACE is
+   set.  */
+
+void
+__vtv_log_verification_failure (const char *log_msg, bool generate_backtrace)
+{
+  if (vtv_failures_log_fd == -1)
+    vtv_failures_log_fd = __vtv_open_log ("vtable_verification_failures.log");
+
+  if (vtv_failures_log_fd == -1)
+    return;
+
+  __vtv_add_to_log (vtv_failures_log_fd, "%s", log_msg);
+
+  if (generate_backtrace)
+    {
+#define STACK_DEPTH 20
+      void *callers[STACK_DEPTH];
+      int actual_depth = backtrace (callers, STACK_DEPTH);
+      backtrace_symbols_fd (callers, actual_depth, vtv_failures_log_fd);
+    }
+}