diff options
Diffstat (limited to 'absl/debugging/internal/stack_consumption.cc')
-rw-r--r-- | absl/debugging/internal/stack_consumption.cc | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/absl/debugging/internal/stack_consumption.cc b/absl/debugging/internal/stack_consumption.cc index 8dfd94aa..875ca6d9 100644 --- a/absl/debugging/internal/stack_consumption.cc +++ b/absl/debugging/internal/stack_consumption.cc @@ -27,7 +27,7 @@ #include "absl/base/internal/raw_logging.h" namespace absl { -inline namespace lts_2019_08_08 { +ABSL_NAMESPACE_BEGIN namespace debugging_internal { namespace { @@ -116,10 +116,11 @@ int GetSignalHandlerStackConsumption(void (*signal_handler)(int)) { // Set up the alt-signal-stack (and save the older one). stack_t sigstk; memset(&sigstk, 0, sizeof(sigstk)); - stack_t old_sigstk; sigstk.ss_sp = altstack; sigstk.ss_size = kAlternateStackSize; sigstk.ss_flags = 0; + stack_t old_sigstk; + memset(&old_sigstk, 0, sizeof(old_sigstk)); ABSL_RAW_CHECK(sigaltstack(&sigstk, &old_sigstk) == 0, "sigaltstack() failed"); @@ -153,6 +154,15 @@ int GetSignalHandlerStackConsumption(void (*signal_handler)(int)) { int signal_handler_stack_consumption = GetStackConsumption(altstack); // Now restore the old alt-signal-stack and signal handlers. + if (old_sigstk.ss_sp == nullptr && old_sigstk.ss_size == 0 && + (old_sigstk.ss_flags & SS_DISABLE)) { + // https://git.musl-libc.org/cgit/musl/commit/src/signal/sigaltstack.c?id=7829f42a2c8944555439380498ab8b924d0f2070 + // The original stack has ss_size==0 and ss_flags==SS_DISABLE, but some + // versions of musl have a bug that rejects ss_size==0. Work around this by + // setting ss_size to MINSIGSTKSZ, which should be ignored by the kernel + // when SS_DISABLE is set. + old_sigstk.ss_size = MINSIGSTKSZ; + } ABSL_RAW_CHECK(sigaltstack(&old_sigstk, nullptr) == 0, "sigaltstack() failed"); ABSL_RAW_CHECK(sigaction(SIGUSR1, &old_sa1, nullptr) == 0, @@ -168,7 +178,7 @@ int GetSignalHandlerStackConsumption(void (*signal_handler)(int)) { } } // namespace debugging_internal -} // inline namespace lts_2019_08_08 +ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_INTERNAL_HAVE_DEBUGGING_STACK_CONSUMPTION |