use sysctl instead of /proc on FreeBSD...

base/base_paths_posix.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This is really Posix minus Mac. Mac code is in base_paths_mac.mm.
 
 #include "base/base_paths.h"
 
 #include <unistd.h>
+#if defined(OS_FREEBSD)
+#include <sys/param.h>
+#include <sys/sysctl.h>
+#endif
 
 #include "base/env_var.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "base/sys_string_conversions.h"
 #include "base/xdg_util.h"
 
 namespace base {
 
 #if defined(OS_LINUX)
 const char kSelfExe[] = "/proc/self/exe";
 #elif defined(OS_SOLARIS)
 const char kSelfExe[] = getexecname();
-#elif defined(OS_FREEBSD)
-const char kSelfExe[] = "/proc/curproc/file";
 #endif
 
 bool PathProviderPosix(int key, FilePath* result) {
   FilePath path;
   switch (key) {
     case base::FILE_EXE:
     case base::FILE_MODULE: {  // TODO(evanm): is this correct?
+#if defined(OS_LINUX)
       char bin_dir[PATH_MAX + 1];
       int bin_dir_size = readlink(kSelfExe, bin_dir, PATH_MAX);
       if (bin_dir_size < 0 || bin_dir_size > PATH_MAX) {
         NOTREACHED() << "Unable to resolve " << kSelfExe << ".";
         return false;
       }
       bin_dir[bin_dir_size] = 0;
       *result = FilePath(bin_dir);
       return true;
+#elif defined(OS_FREEBSD)
+      int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
+      char bin_dir[PATH_MAX + 1];
+      size_t length = sizeof(bin_dir);
+      int error = sysctl(name, 4, bin_dir, &length, NULL, 0);
+      if (error < 0 || length == 0 || strlen(bin_dir) == 0) {
+        NOTREACHED() << "Unable to resolve path.";
+        return false;
+      }
+      bin_dir[strlen(bin_dir)] = 0;
+      *result = FilePath(bin_dir);
+      return true;
+#endif
     }
     case base::DIR_SOURCE_ROOT: {
       // Allow passing this in the environment, for more flexibility in build
       // tree configurations (sub-project builds, gyp --output_dir, etc.)
       scoped_ptr<base::EnvVarGetter> env(base::EnvVarGetter::Create());
       std::string cr_source_root;
       if (env->GetEnv("CR_SOURCE_ROOT", &cr_source_root)) {
         path = FilePath(cr_source_root);
         if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
           *result = path;
@@ skipping 27 matching lines @@
       scoped_ptr<base::EnvVarGetter> env(base::EnvVarGetter::Create());
       FilePath cache_dir(base::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
                                                ".cache"));
       *result = cache_dir;
       return true;
   }
   return false;
 }
 
 }  // namespace base