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192 lines
5.5 KiB
C++
192 lines
5.5 KiB
C++
/* Copyright (C) 2012-2013
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Free Software Foundation
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file is part of the vtable verication runtime library (see
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comments in vtv_rts.cc for more information about vtable
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verification). This file contains log file utilities. */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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#include <windows.h>
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#else
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#include <execinfo.h>
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#endif
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#include <unistd.h>
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#include <errno.h>
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#include "vtv_utils.h"
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#ifndef HAVE_SECURE_GETENV
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# ifdef HAVE___SECURE_GETENV
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# define secure_getenv __secure_getenv
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# else
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# define secure_getenv getenv
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# endif
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#endif
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static int vtv_failures_log_fd = -1;
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/* This function takes the NAME of a log file to open, attempts to
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open it in the logs_dir directory, and returns the resulting file
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descriptor.
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This function first checks to see if the user has specifed (via
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the environment variable VTV_LOGS_DIR) a directory to use for the
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vtable verification logs. If that fails, the function will open
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the logs in the current directory.
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*/
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int
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__vtv_open_log (const char *name)
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{
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char log_name[1024];
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char log_dir[512];
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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pid_t process_id = GetCurrentProcessId ();
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#else
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uid_t user_id = getuid ();
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pid_t process_id = getpid ();
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#endif
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char *logs_prefix;
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bool logs_dir_specified = false;
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int fd = -1;
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logs_prefix = secure_getenv ("VTV_LOGS_DIR");
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if (logs_prefix && strlen (logs_prefix) > 0)
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{
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logs_dir_specified = true;
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#ifdef __MINGW32__
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mkdir (logs_prefix);
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#else
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mkdir (logs_prefix, S_IRWXU);
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#endif
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snprintf (log_dir, sizeof (log_dir), "%s/vtv_logs", logs_prefix);
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#ifdef __MINGW32__
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mkdir (log_dir);
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#else
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mkdir (log_dir, S_IRWXU);
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#endif
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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snprintf (log_name, sizeof (log_name), "%s_%d_%s", log_dir,
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(unsigned) process_id, name);
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fd = open (log_name, O_WRONLY | O_APPEND | O_CREAT, S_IRWXU);
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#else
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snprintf (log_name, sizeof (log_name), "%s/%d_%d_%s", log_dir,
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(unsigned) user_id, (unsigned) process_id, name);
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fd = open (log_name, O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW,
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S_IRWXU);
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#endif
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}
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else
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fd = dup (2);
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if (fd == -1)
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__vtv_add_to_log (2, "Cannot open log file %s %s\n", name,
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strerror (errno));
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return fd;
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}
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/* This function takes a file descriptor (FD) and a string (STR) and
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tries to write the string to the file. */
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static int
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vtv_log_write (int fd, const char *str)
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{
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if (write (fd, str, strlen (str)) != -1)
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return 0;
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if (fd != 2) /* Make sure we dont get in a loop. */
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__vtv_add_to_log (2, "Error writing to log: %s\n", strerror (errno));
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return -1;
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}
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/* This function takes a file decriptor (LOG_FILE) and an output
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format string (FORMAT), followed by zero or more print format
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arguments (the same as fprintf, for example). It gets the current
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process ID and PPID, pre-pends them to the formatted message, and
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writes write it out to the log file referenced by LOG_FILE via calles
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to vtv_log_write. */
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int
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__vtv_add_to_log (int log_file, const char * format, ...)
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{
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/* We dont want to dynamically allocate this buffer. This should be
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more than enough in most cases. It if isn't we are careful not to
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do a buffer overflow. */
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char output[1024];
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va_list ap;
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va_start (ap, format);
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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snprintf (output, sizeof (output), "VTV: PID=%ld ", GetCurrentProcessId ());
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#else
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snprintf (output, sizeof (output), "VTV: PID=%d PPID=%d ", getpid (),
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getppid ());
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#endif
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vtv_log_write (log_file, output);
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vsnprintf (output, sizeof (output), format, ap);
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vtv_log_write (log_file, output);
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va_end (ap);
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return 0;
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}
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/* Open error logging file, if not already open, and write vtable
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verification failure messages (LOG_MSG) to the log file. Also
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generate a backtrace in the log file, if GENERATE_BACKTRACE is
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set. */
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void
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__vtv_log_verification_failure (const char *log_msg, bool generate_backtrace)
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{
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if (vtv_failures_log_fd == -1)
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vtv_failures_log_fd = __vtv_open_log ("vtable_verification_failures.log");
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if (vtv_failures_log_fd == -1)
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return;
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__vtv_add_to_log (vtv_failures_log_fd, "%s", log_msg);
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#if !defined (__CYGWIN__) && !defined (__MINGW32__)
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if (generate_backtrace)
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{
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#define STACK_DEPTH 20
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void *callers[STACK_DEPTH];
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int actual_depth = backtrace (callers, STACK_DEPTH);
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backtrace_symbols_fd (callers, actual_depth, vtv_failures_log_fd);
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}
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#endif
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}
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