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[msan] Extract signal_impl and sigaction_impl 

Summary: Preparation for using interceptor from sanitizer_common.

Reviewers: eugenis

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39824

llvm-svn: 317844
This commit is contained in:
Vitaly Buka 2017-11-09 22:52:15 +00:00
parent 43c3e6ae1c
commit 8e92025718
1 changed files with 17 additions and 5 deletions
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22
compiler-rt/lib/msan/msan_interceptors.cc
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@ -1006,8 +1006,22 @@ static void read_sigaction(const __sanitizer_sigaction *act) {
CHECK_UNPOISONED(&act->sa_mask, sizeof(act->sa_mask));
}
static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact);
static uptr signal_impl(int signo, uptr cb);
INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact) {
return sigaction_impl(signo, act, oldact);
}
INTERCEPTOR(int, signal, int signo, uptr cb) {
cb = signal_impl(signo, cb);
return REAL(signal)(signo, cb);
}
static int sigaction_impl(int signo, const __sanitizer_sigaction *act,
__sanitizer_sigaction *oldact) {
ENSURE_MSAN_INITED();
if (act) read_sigaction(act);
int res;
@ -1045,19 +1059,17 @@ INTERCEPTOR(int, sigaction, int signo, const __sanitizer_sigaction *act,
return res;
}
INTERCEPTOR(int, signal, int signo, uptr cb) {
static uptr signal_impl(int signo, uptr cb) {
ENSURE_MSAN_INITED();
if (flags()->wrap_signals) {
CHECK_LT(signo, kMaxSignals);
SpinMutexLock lock(&sigactions_mu);
if (cb != __sanitizer::sig_ign && cb != __sanitizer::sig_dfl) {
atomic_store(&sigactions[signo], cb, memory_order_relaxed);
cb = (uptr) SignalHandler;
cb = (uptr)&SignalHandler;
}
return REAL(signal)(signo, cb);
} else {
return REAL(signal)(signo, cb);
}
return cb;
}
extern "C" int pthread_attr_init(void *attr);