[sanitizer] Allow sanitizers to redefine implementation of signal int…

…erceptors

Reviewers: eugenis

Subscribers: llvm-commits, kubamracek

Differential Revision: https://reviews.llvm.org/D39870

llvm-svn: 317843

compiler-rt/lib/asan/asan_interceptors.h

@@ -19,6 +19,10 @@
 #include "interception/interception.h"
 #include "sanitizer_common/sanitizer_platform_interceptors.h"
 
+namespace __sanitizer {
+struct __sanitizer_sigaction;
+}
+
 namespace __asan {
 
 void InitializeAsanInterceptors();
@@ -106,8 +110,9 @@ DECLARE_REAL(char*, strncpy, char *to, const char *from, uptr size)
 DECLARE_REAL(uptr, strnlen, const char *s, uptr maxlen)
 DECLARE_REAL(char*, strstr, const char *s1, const char *s2)
 struct sigaction;
-DECLARE_REAL(int, sigaction, int signum, const struct sigaction *act,
-                             struct sigaction *oldact)
+DECLARE_REAL(int, sigaction, int signum,
+             const __sanitizer::__sanitizer_sigaction *act,
+             __sanitizer::__sanitizer_sigaction *oldact)
 
 #if !SANITIZER_MAC
 #define ASAN_INTERCEPT_FUNC(name)                                        \

compiler-rt/lib/sanitizer_common/sanitizer_signal_interceptors.inc

@@ -18,34 +18,48 @@
 
 using namespace __sanitizer;
 
+namespace __sanitizer {
+struct __sanitizer_sigaction;
+}
+
+#ifndef SIGNAL_INTERCEPTOR_SIGNAL_IMPL
+#define SIGNAL_INTERCEPTOR_SIGNAL_IMPL(func, signum, handler) \
+  { return REAL(func)(signum, handler); }
+#endif
+
+#ifndef SIGNAL_INTERCEPTOR_SIGACTION_IMPL
+#define SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact) \
+  { return REAL(sigaction)(signum, act, oldact); }
+#endif
+
 #if SANITIZER_INTERCEPT_BSD_SIGNAL
-INTERCEPTOR(void *, bsd_signal, int signum, void *handler) {
+INTERCEPTOR(void *, bsd_signal, int signum, uptr handler) {
   if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
-  return REAL(bsd_signal)(signum, handler);
+  SIGNAL_INTERCEPTOR_SIGNAL_IMPL(bsd_signal, signum, handler);
 }
 #define INIT_BSD_SIGNAL COMMON_INTERCEPT_FUNCTION(bsd_signal)
 #else  // SANITIZER_INTERCEPT_BSD_SIGNAL
 #define INIT_BSD_SIGNAL
 #endif  // SANITIZER_INTERCEPT_BSD_SIGNAL
 
 #if SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION
-INTERCEPTOR(void *, signal, int signum, void *handler) {
+INTERCEPTOR(void *, signal, int signum, uptr handler) {
   if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return nullptr;
-  return REAL(signal)(signum, handler);
+  SIGNAL_INTERCEPTOR_SIGNAL_IMPL(signal, signum, handler);
 }
 #define INIT_SIGNAL COMMON_INTERCEPT_FUNCTION(signal)
 
-INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
-            struct sigaction *oldact) {
+INTERCEPTOR(int, sigaction, int signum, const __sanitizer_sigaction *act,
+            __sanitizer_sigaction *oldact) {
   if (GetHandleSignalMode(signum) == kHandleSignalExclusive) return 0;
-  return REAL(sigaction)(signum, act, oldact);
+  SIGNAL_INTERCEPTOR_SIGACTION_IMPL(signum, act, oldact);
 }
 #define INIT_SIGACTION COMMON_INTERCEPT_FUNCTION(sigaction)
 
 namespace __sanitizer {
 int real_sigaction(int signum, const void *act, void *oldact) {
-  return REAL(sigaction)(signum, (const struct sigaction *)act,
-                         (struct sigaction *)oldact);
+  return REAL(sigaction)(signum, (const __sanitizer_sigaction *)act,
+                         (__sanitizer_sigaction *)oldact);
 }
 }  // namespace __sanitizer
 #else  // SANITIZER_INTERCEPT_SIGNAL_AND_SIGACTION