Improve ARM CPU info reporting.

This patch improves several things for Linux/ARM:

- Better detection of the number of CPUs on the target
  device. The content of /proc/cpuinfo only matches the
  number of "online" CPUs, which varies over time with
  recent Android devices.

- Reconstruct the CPUID and ELF hwcaps values from
  /proc/cpuinfo, this is useful to better identify
  target devices in minidumps.

- Make minidump_dump display the new information
  in useful ways.

- Write a small helper class to parse /proc/cpuinfo
  and also use it for x86/64.

- Write a small helper class to parse sysfds cpu lists.

- Add a my_memchr() implementation.

- Add unit tests.

Tested on a Nexus S (1 CPU), Galaxy Nexus (2 CPUs)
and a Nexus 4 (4 CPUs).

Review URL: https://breakpad.appspot.com/540003

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1160 4c0a9323-5329-0410-9bdc-e9ce6186880e

1 files changed, 37 insertions, 64 deletions

diff --git a/src/client/linux/minidump_writer/line_reader_unittest.cc b/src/client/linux/minidump_writer/line_reader_unittest.cc
index 4448281d..928626e1 100644
--- a/src/client/linux/minidump_writer/line_reader_unittest.cc
+++ b/src/client/linux/minidump_writer/line_reader_unittest.cc
@@ -34,47 +34,41 @@
 #include "client/linux/minidump_writer/line_reader.h"
 #include "breakpad_googletest_includes.h"
 #include "common/linux/eintr_wrapper.h"
+#include "common/tests/auto_testfile.h"
 
 using namespace google_breakpad;
 
-#if !defined(__ANDROID__)
-#define TEMPDIR "/tmp"
-#else
-#define TEMPDIR "/data/local/tmp"
-#endif
-
-static int TemporaryFile() {
-  static const char templ[] = TEMPDIR "/line-reader-unittest-XXXXXX";
-  char templ_copy[sizeof(templ)];
-  memcpy(templ_copy, templ, sizeof(templ));
-  const int fd = mkstemp(templ_copy);
-  if (fd >= 0)
-    unlink(templ_copy);
-
-  return fd;
-}
-
 namespace {
+
 typedef testing::Test LineReaderTest;
+
+class ScopedTestFile : public AutoTestFile {
+public:
+  explicit ScopedTestFile(const char* text)
+    : AutoTestFile("line_reader", text) {
+  }
+
+  ScopedTestFile(const char* text, size_t text_len)
+    : AutoTestFile("line_reader", text, text_len) {
+  }
+};
+
 }
 
 TEST(LineReaderTest, EmptyFile) {
-  const int fd = TemporaryFile();
-  LineReader reader(fd);
+  ScopedTestFile file("");
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }
 
 TEST(LineReaderTest, OneLineTerminated) {
-  const int fd = TemporaryFile();
-  const int r = HANDLE_EINTR(write(fd, "a\n", 2));
-  ASSERT_EQ(2, r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file("a\n");
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned int len;
@@ -85,16 +79,12 @@ TEST(LineReaderTest, OneLineTerminated) {
   reader.PopLine(len);
 
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }
 
 TEST(LineReaderTest, OneLine) {
-  const int fd = TemporaryFile();
-  const int r = HANDLE_EINTR(write(fd, "a", 1));
-  ASSERT_EQ(1, r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file("a");
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
@@ -105,16 +95,12 @@ TEST(LineReaderTest, OneLine) {
   reader.PopLine(len);
 
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }
 
 TEST(LineReaderTest, TwoLinesTerminated) {
-  const int fd = TemporaryFile();
-  const int r = HANDLE_EINTR(write(fd, "a\nb\n", 4));
-  ASSERT_EQ(4, r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file("a\nb\n");
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
@@ -131,16 +117,12 @@ TEST(LineReaderTest, TwoLinesTerminated) {
   reader.PopLine(len);
 
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }
 
 TEST(LineReaderTest, TwoLines) {
-  const int fd = TemporaryFile();
-  const int r = HANDLE_EINTR(write(fd, "a\nb", 3));
-  ASSERT_EQ(3, r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file("a\nb");
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
@@ -157,18 +139,14 @@ TEST(LineReaderTest, TwoLines) {
   reader.PopLine(len);
 
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }
 
 TEST(LineReaderTest, MaxLength) {
-  const int fd = TemporaryFile();
-  char l[LineReader::kMaxLineLen - 1];
+  char l[LineReader::kMaxLineLen-1];
   memset(l, 'a', sizeof(l));
-  const int r = HANDLE_EINTR(write(fd, l, sizeof(l)));
-  ASSERT_EQ(static_cast<ssize_t>(sizeof(l)), r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file(l, sizeof(l));
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
@@ -176,22 +154,17 @@ TEST(LineReaderTest, MaxLength) {
   ASSERT_EQ(sizeof(l), len);
   ASSERT_TRUE(memcmp(l, line, sizeof(l)) == 0);
   ASSERT_EQ('\0', line[len]);
-
-  close(fd);
 }
 
 TEST(LineReaderTest, TooLong) {
-  const int fd = TemporaryFile();
+  // Note: this writes kMaxLineLen 'a' chars in the test file.
   char l[LineReader::kMaxLineLen];
   memset(l, 'a', sizeof(l));
-  const int r = HANDLE_EINTR(write(fd, l, sizeof(l)));
-  ASSERT_EQ(static_cast<ssize_t>(sizeof(l)), r);
-  lseek(fd, 0, SEEK_SET);
-  LineReader reader(fd);
+  ScopedTestFile file(l, sizeof(l));
+  ASSERT_TRUE(file.IsOk());
+  LineReader reader(file.GetFd());
 
   const char *line;
   unsigned len;
   ASSERT_FALSE(reader.GetNextLine(&line, &len));
-
-  close(fd);
 }