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Unified Diff: third_party/crashpad/crashpad/test/paths_linux.cc

Issue 2478633002: Update Crashpad to b47bf6c250c6b825dee1c5fbad9152c2c962e828 (Closed)
Patch Set: mac comment 2 Created 4 years, 1 month ago
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Index: third_party/crashpad/crashpad/test/paths_linux.cc
diff --git a/third_party/crashpad/crashpad/test/paths_linux.cc b/third_party/crashpad/crashpad/test/paths_linux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6e6da0e057d647a7bdce82cc6c80867fd5fb5d74
--- /dev/null
+++ b/third_party/crashpad/crashpad/test/paths_linux.cc
@@ -0,0 +1,62 @@
+// Copyright 2016 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "test/paths.h"
+
+#include <limits.h>
+#include <unistd.h>
+
+#include <algorithm>
+#include <string>
+
+#include "base/logging.h"
+#include "util/misc/implicit_cast.h"
+
+namespace crashpad {
+namespace test {
+
+// static
+base::FilePath Paths::Executable() {
+ // Linux does not provide a straightforward way to size the buffer before
+ // calling readlink(). Normally, the st_size field returned by lstat() could
+ // be used, but this is usually zero for things in /proc.
+ //
+ // The /proc filesystem does not provide any way to read “exe” links for
+ // pathnames longer than a page. See linux-4.4.27/fs/proc/base.c
+ // do_proc_readlink(), which allocates a single page to receive the path
+ // string. Coincidentally, the page size and PATH_MAX are normally the same
+ // value, although neither is strictly a limit on the length of a pathname.
+ //
+ // On Android, the smaller of the page size and PATH_MAX actually does serve
+ // as an effective limit on the length of an executable’s pathname. See
+ // Android 7.0.0 bionic/linker/linker.cpp get_executable_path(), which aborts
+ // via __libc_fatal() if the “exe” link can’t be read into a PATH_MAX-sized
+ // buffer.
+ std::string exe_path(std::max(implicit_cast<size_t>(sysconf(_SC_PAGESIZE)),
+ implicit_cast<size_t>(PATH_MAX)),
+ std::string::value_type());
+ ssize_t exe_path_len =
+ readlink("/proc/self/exe", &exe_path[0], exe_path.size());
+ if (exe_path_len < 0) {
+ PLOG(FATAL) << "readlink";
+ } else if (static_cast<size_t>(exe_path_len) >= exe_path.size()) {
+ LOG(FATAL) << "readlink";
+ }
+
+ exe_path.resize(exe_path_len);
+ return base::FilePath(exe_path);
+}
+
+} // namespace test
+} // namespace crashpad
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