Modify CrashGenerator::CreateChildCrash to copy proc files.

This patch is taken from the downstream version of breakpad in
Chromium OS:  https://gerrit.chromium.org/gerrit/15148

LinuxCoreDumperTest previously assumes the proc files of the child
process created by CrashGenerator::CreateChildCrash() have the same
content as its parent process, which may not be true. This CL modifies
CrashGenerator to copy the proc files of the child process, created by
CreateChildCrash(), before crashing that process.

BUG=chromium-os:25252
TEST=Verified the following:
TEST=Tested the following:
1. Build on 32-bit and 64-bit Linux with gcc 4.4.3 and gcc 4.6.
2. Build on Mac OS X 10.6.8 with gcc 4.2 and clang 3.0 (with latest gmock).
3. All unit tests pass.
Review URL: https://breakpad.appspot.com/353001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@925 4c0a9323-5329-0410-9bdc-e9ce6186880e

1 files changed, 55 insertions, 0 deletions

diff --git a/src/common/tests/file_utils.cc b/src/common/tests/file_utils.cc
index 0d9b04ad..1264b078 100644
--- a/src/common/tests/file_utils.cc
+++ b/src/common/tests/file_utils.cc
@@ -40,6 +40,61 @@
 
 namespace google_breakpad {
 
+bool CopyFile(const char* from_path, const char* to_path) {
+  int infile = HANDLE_EINTR(open(from_path, O_RDONLY));
+  if (infile < 0) {
+    perror("open");
+    return false;
+  }
+
+  int outfile = HANDLE_EINTR(creat(to_path, 0666));
+  if (outfile < 0) {
+    perror("creat");
+    if (HANDLE_EINTR(close(infile)) < 0) {
+      perror("close");
+    }
+    return false;
+  }
+
+  char buffer[1024];
+  bool result = true;
+
+  while (result) {
+    ssize_t bytes_read = HANDLE_EINTR(read(infile, buffer, sizeof(buffer)));
+    if (bytes_read < 0) {
+      perror("read");
+      result = false;
+      break;
+    }
+    if (bytes_read == 0)
+      break;
+    ssize_t bytes_written_per_read = 0;
+    do {
+      ssize_t bytes_written_partial = HANDLE_EINTR(write(
+          outfile,
+          &buffer[bytes_written_per_read],
+          bytes_read - bytes_written_per_read));
+      if (bytes_written_partial < 0) {
+        perror("write");
+        result = false;
+        break;
+      }
+      bytes_written_per_read += bytes_written_partial;
+    } while (bytes_written_per_read < bytes_read);
+  }
+
+  if (HANDLE_EINTR(close(infile)) == -1) {
+    perror("close");
+    result = false;
+  }
+  if (HANDLE_EINTR(close(outfile)) == -1) {
+    perror("close");
+    result = false;
+  }
+
+  return result;
+}
+
 bool ReadFile(const char* path, void* buffer, ssize_t* buffer_size) {
   int fd = HANDLE_EINTR(open(path, O_RDONLY));
   if (fd == -1) {