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[posix] reset the signal actions after processing signals (#8934)

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When compiling the otbr-agent in Android, Android will link the
function debuggerd_init() and call it before calling the function
main(). The function debuggerd_init() sets signal handlers to
catch signals. This commit resets the signal actions to default and
re-raises the original signal to let the pre-configured functions
to catch signals.
This commit is contained in:
Zhanglong Xia
2023-04-05 23:23:01 -07:00
committed by GitHub
parent adde085fce
commit b48544c3b8
1 changed files with 18 additions and 7 deletions
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src/posix/platform/backtrace.cpp
+18 -7
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@@ -132,6 +132,17 @@ exit:
return;
}
#endif // OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE
static constexpr uint8_t kNumSignals = 6;
static constexpr int kSignals[kNumSignals] = {SIGABRT, SIGILL, SIGSEGV, SIGBUS, SIGTRAP, SIGFPE};
static struct sigaction sSigActions[kNumSignals];
static void resetSignalActions(void)
{
for (uint8_t i = 0; i < kNumSignals; i++)
{
sigaction(kSignals[i], &sSigActions[i], (struct sigaction *)nullptr);
}
}
static void signalCritical(int sig, siginfo_t *info, void *ucontext)
{
@@ -144,7 +155,9 @@ static void signalCritical(int sig, siginfo_t *info, void *ucontext)
dumpStack();
otLogCritPlat("------------------ END OF CRASH ------------------");
exit(EXIT_FAILURE);
resetSignalActions();
raise(sig);
}
void platformBacktraceInit(void)
@@ -154,12 +167,10 @@ void platformBacktraceInit(void)
sigact.sa_sigaction = &signalCritical;
sigact.sa_flags = SA_RESTART | SA_SIGINFO | SA_NOCLDWAIT;
sigaction(SIGABRT, &sigact, (struct sigaction *)nullptr);
sigaction(SIGILL, &sigact, (struct sigaction *)nullptr);
sigaction(SIGSEGV, &sigact, (struct sigaction *)nullptr);
sigaction(SIGBUS, &sigact, (struct sigaction *)nullptr);
sigaction(SIGTRAP, &sigact, (struct sigaction *)nullptr);
sigaction(SIGFPE, &sigact, (struct sigaction *)nullptr);
for (uint8_t i = 0; i < kNumSignals; i++)
{
sigaction(kSignals[i], &sigact, &sSigActions[i]);
}
}
#else // OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE || defined(__GLIBC__)
void platformBacktraceInit(void) {}