// Check that stores in signal handlers are not recorded in origin history.
// This is, in fact, undesired behavior caused by our chained origins
// implementation being not async-signal-safe.

// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN:     not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out

// RUN: %clangxx_msan -mllvm -msan-instrumentation-with-call-threshold=0 -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN:     not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out

#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

volatile int x, y;

void SignalHandler(int signo) {
  y = x;
}

int main(int argc, char *argv[]) {
  int volatile z;
  x = z;

  signal(SIGHUP, SignalHandler);
  kill(getpid(), SIGHUP);
  signal(SIGHUP, SIG_DFL);

  return y;
}

// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
// CHECK-NOT: in SignalHandler

// Check that stores in signal handlers are not recorded in origin history.
// This is, in fact, undesired behavior caused by our chained origins
// implementation being not async-signal-safe.

// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN:     not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out

// RUN: %clangxx_msan -mllvm -msan-instrumentation-with-call-threshold=0 -fsanitize-memory-track-origins=2 -m64 -O3 %s -o %t && \
// RUN:     not %run %t >%t.out 2>&1
// RUN: FileCheck %s < %t.out

#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

volatile int x, y;

void SignalHandler(int signo) {
  y = x;
}

int main(int argc, char *argv[]) {
  int volatile z;
  x = z;

  signal(SIGUSR1, SignalHandler);
  kill(getpid(), SIGUSR1);
  signal(SIGUSR1, SIG_DFL);

  return y;
}

// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
// CHECK-NOT: in SignalHandler

--- 
+++ 
@@ -25,9 +25,9 @@
   int volatile z;
   x = z;
 
-  signal(SIGUSR1, SignalHandler);
-  kill(getpid(), SIGUSR1);
-  signal(SIGUSR1, SIG_DFL);
+  signal(SIGHUP, SignalHandler);
+  kill(getpid(), SIGHUP);
+  signal(SIGHUP, SIG_DFL);
 
   return y;
 }
[msan] Use SIGHUP instead of SIGUSR1 in test.

Apparently, SIGUSR1 does not work on x86_64+ArchLinux for some reason.

For more details, see:
https://groups.google.com/forum/#!topic/llvm-dev/4Ag1FF4M2Dw


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@214289 91177308-0d34-0410-b5e6-96231b3b80d8
