71 static bool pid_contains_tid(int pid_proc_fd, pid_t tid) {  in pid_contains_tid()  argument
73   std::string task_path = StringPrintf("task/%d", tid);  in pid_contains_tid()
87 static bool ptrace_seize_thread(int pid_proc_fd, pid_t tid, std::string* error, int flags = 0) {  in ptrace_seize_thread()  argument
88   if (ptrace(PTRACE_SEIZE, tid, 0, flags) != 0) {  in ptrace_seize_thread()
91       pid_t tracer_pid = get_tracer(tid);  in ptrace_seize_thread()
93         *error = StringPrintf("failed to attach to thread %d, already traced by %d (%s)", tid,  in ptrace_seize_thread()
99     *error = StringPrintf("failed to attach to thread %d: %s", tid, strerror(errno));  in ptrace_seize_thread()
104   if (!pid_contains_tid(pid_proc_fd, tid)) {  in ptrace_seize_thread()
105     if (ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {  in ptrace_seize_thread()
106       PLOG(WARNING) << "failed to detach from thread " << tid;  in ptrace_seize_thread()
108     *error = StringPrintf("thread %d is not in process", tid);  in ptrace_seize_thread()
115 static bool wait_for_stop(pid_t tid, int* received_signal) {  in wait_for_stop()  argument
118     pid_t result = waitpid(tid, &status, __WALL);  in wait_for_stop()
119     if (result != tid) {  in wait_for_stop()
120       PLOG(ERROR) << "waitpid failed on " << tid << " while detaching";  in wait_for_stop()
136 static bool ptrace_interrupt(pid_t tid, int* received_signal) {  in ptrace_interrupt()  argument
137   if (ptrace(PTRACE_INTERRUPT, tid, 0, 0) == 0) {  in ptrace_interrupt()
138     return wait_for_stop(tid, received_signal);  in ptrace_interrupt()
141   PLOG(ERROR) << "failed to interrupt " << tid << " to detach";  in ptrace_interrupt()
505       info.tid = thread;  in main()
585   for (const auto& [tid, thread] : thread_info) {  in main()
589       if (tgkill(target_process, tid, SIGSTOP) != 0) {  in main()
590         PLOG(WARNING) << "failed to send SIGSTOP to " << tid;  in main()
594     LOG(DEBUG) << "detaching from thread " << tid;  in main()
595     if (ptrace(PTRACE_DETACH, tid, 0, resume_signal) != 0) {  in main()
596       PLOG(ERROR) << "failed to detach from thread " << tid;  in main()