diff options
Diffstat (limited to 'sigchainlib/sigchain.cc')
| -rw-r--r-- | sigchainlib/sigchain.cc | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/sigchainlib/sigchain.cc b/sigchainlib/sigchain.cc index 2ba7405..c655226 100644 --- a/sigchainlib/sigchain.cc +++ b/sigchainlib/sigchain.cc @@ -45,8 +45,8 @@ class SignalAction { // Unclaim the signal and restore the old action. void Unclaim(int signal) { - sigaction(signal, &action_, NULL); // Restore old action. claimed_ = false; + sigaction(signal, &action_, NULL); // Restore old action. } // Get the action associated with this signal. @@ -155,8 +155,12 @@ int sigaction(int signal, const struct sigaction* new_action, struct sigaction* void* linked_sigaction_sym = dlsym(RTLD_NEXT, "sigaction"); if (linked_sigaction_sym == nullptr) { - log("Unable to find next sigaction in signal chain"); - abort(); + linked_sigaction_sym = dlsym(RTLD_DEFAULT, "sigaction"); + if (linked_sigaction_sym == nullptr || + linked_sigaction_sym == reinterpret_cast<void*>(sigaction)) { + log("Unable to find next sigaction in signal chain"); + abort(); + } } typedef int (*SigAction)(int, const struct sigaction*, struct sigaction*); @@ -184,8 +188,12 @@ int sigprocmask(int how, const sigset_t* bionic_new_set, sigset_t* bionic_old_se void* linked_sigprocmask_sym = dlsym(RTLD_NEXT, "sigprocmask"); if (linked_sigprocmask_sym == nullptr) { - log("Unable to find next sigprocmask in signal chain"); - abort(); + linked_sigprocmask_sym = dlsym(RTLD_DEFAULT, "sigprocmask"); + if (linked_sigprocmask_sym == nullptr || + linked_sigprocmask_sym == reinterpret_cast<void*>(sigprocmask)) { + log("Unable to find next sigprocmask in signal chain"); + abort(); + } } typedef int (*SigProcMask)(int how, const sigset_t*, sigset_t*); |