Fix a couple of bugs where we generate incorrect minidump files on...

src/client/linux/handler/exception_handler.cc

Index: src/client/linux/handler/exception_handler.cc
===================================================================
--- src/client/linux/handler/exception_handler.cc	(revision 642)
+++ src/client/linux/handler/exception_handler.cc	(working copy)
@@ -72,6 +72,7 @@
 #include <signal.h>
 #include <stdio.h>
 #include <sys/mman.h>
+#include <sys/prctl.h>
 #include <sys/signal.h>
 #include <sys/syscall.h>
 #include <sys/ucontext.h>
@@ -268,8 +269,11 @@
   // crashed. The default action for all the signals which we catch is Core, so
   // this is the end of us.
   signal(sig, SIG_DFL);
-  tgkill(getpid(), sys_gettid(), sig);
 
+  // TODO(markus): mask signal and return to caller
+  tgkill(getpid(), syscall(__NR_gettid), sig);
+  _exit(1);
+
   // not reached.
 }
 
@@ -296,7 +300,7 @@
     return false;
 
   // Allow ourselves to be dumped.
-  sys_prctl(PR_SET_DUMPABLE, 1);
+  prctl(PR_SET_DUMPABLE, 1);
   CrashContext context;
   memcpy(&context.siginfo, info, sizeof(siginfo_t));
   memcpy(&context.context, uc, sizeof(struct ucontext));
@@ -309,7 +313,7 @@
            sizeof(context.float_state));
   }
 #endif
-  context.tid = sys_gettid();
+  context.tid = syscall(__NR_gettid);
   if (crash_handler_ != NULL) {
     if (crash_handler_(&context, sizeof(context),
                        callback_context_)) {