crash_dump: fork a copy of the target's address space.
Reduce the amount of time that a process remains paused by pausing its
threads, fetching their registers, and then performing unwinding on a
copy of its address space. This also works around a kernel change
that's in 4.9 that prevents ptrace from reading memory of processes
that we don't have immediate permissions to ptrace (even if we
previously ptraced them).
Bug: http://b/62112103
Bug: http://b/63989615
Test: treehugger
Change-Id: I7b9cc5dd8f54a354bc61f1bda0d2b7a8a55733c4
diff --git a/debuggerd/util.cpp b/debuggerd/util.cpp
index 0bb07ac..50c5efc 100644
--- a/debuggerd/util.cpp
+++ b/debuggerd/util.cpp
@@ -18,8 +18,12 @@
#include <sys/socket.h>
+#include <string>
#include <utility>
+#include <android-base/file.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
#include <android-base/unique_fd.h>
#include <cutils/sockets.h>
#include "protocol.h"
@@ -86,3 +90,15 @@
return result;
}
+
+std::string get_process_name(pid_t pid) {
+ std::string result = "<unknown>";
+ android::base::ReadFileToString(android::base::StringPrintf("/proc/%d/cmdline", pid), &result);
+ return result;
+}
+
+std::string get_thread_name(pid_t tid) {
+ std::string result = "<unknown>";
+ android::base::ReadFileToString(android::base::StringPrintf("/proc/%d/comm", tid), &result);
+ return android::base::Trim(result);
+}