Added send_thread_signal() function and properly handle errors caused
by the thread having already died when we send it a signal. Use -1 instead of 0 as invalid Unix pid value.
This commit is contained in:
parent
4378d25bd2
commit
02a53c176e
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@ -416,7 +416,7 @@ static int propagate_console_signal_cb(struct process *process, void *user)
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while (thread)
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{
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struct thread *next = thread->proc_next;
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kill( thread->unix_pid, csi->signal );
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send_thread_signal( thread, csi->signal );
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thread = next;
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}
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}
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@ -720,11 +720,7 @@ DECL_HANDLER(debug_break)
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struct thread *thread;
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for (thread = process->thread_list; thread; thread = thread->proc_next)
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{
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if (thread->unix_pid)
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{
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kill( thread->unix_pid, SIGTRAP );
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break;
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}
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if (send_thread_signal( thread, SIGTRAP )) break;
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}
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if (!thread) set_error( STATUS_ACCESS_DENIED );
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}
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@ -969,7 +969,7 @@ DECL_HANDLER(get_startup_info)
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/* initialize a new process */
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DECL_HANDLER(init_process)
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{
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if (!current->unix_pid)
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if (current->unix_pid == -1)
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{
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fatal_protocol_error( current, "init_process: init_thread not called yet\n" );
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return;
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@ -93,7 +93,7 @@ static int handle_child_status( struct thread *thread, int pid, int status )
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if (thread && (WIFSIGNALED(status) || WIFEXITED(status)))
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{
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thread->attached = 0;
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thread->unix_pid = 0;
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thread->unix_pid = -1;
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if (debug_level)
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{
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if (WIFSIGNALED(status))
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@ -136,6 +136,23 @@ void wait4_thread( struct thread *thread, int signal )
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} while (res && res != signal);
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}
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/* send a Unix signal to a specific thread */
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int send_thread_signal( struct thread *thread, int sig )
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{
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int ret = -1;
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if (thread->unix_pid != -1)
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{
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ret = kill( thread->unix_pid, sig );
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if (ret == -1 && errno == ESRCH) /* thread got killed */
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{
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thread->unix_pid = -1;
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thread->attached = 0;
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}
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}
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return (ret != -1);
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}
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/* attach to a Unix thread */
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static int attach_thread( struct thread *thread )
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{
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@ -143,7 +160,7 @@ static int attach_thread( struct thread *thread )
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if (!use_ptrace) return 0;
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if (ptrace( PTRACE_ATTACH, thread->unix_pid, 0, 0 ) == -1)
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{
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if (errno == ESRCH) thread->unix_pid = 0; /* process got killed */
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if (errno == ESRCH) thread->unix_pid = -1; /* thread got killed */
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return 0;
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}
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if (debug_level) fprintf( stderr, "%04x: *attached*\n", thread->id );
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@ -155,12 +172,13 @@ static int attach_thread( struct thread *thread )
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/* detach from a Unix thread and kill it */
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void detach_thread( struct thread *thread, int sig )
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{
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if (!thread->unix_pid) return;
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if (thread->unix_pid == -1) return;
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if (thread->attached)
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{
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/* make sure it is stopped */
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suspend_thread( thread, 0 );
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if (sig) kill( thread->unix_pid, sig );
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if (sig) send_thread_signal( thread, sig );
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if (thread->unix_pid == -1) return;
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if (debug_level) fprintf( stderr, "%04x: *detached*\n", thread->id );
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ptrace( PTRACE_DETACH, thread->unix_pid, (caddr_t)1, sig );
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thread->suspend = 0; /* detach makes it continue */
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@ -168,7 +186,7 @@ void detach_thread( struct thread *thread, int sig )
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}
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else
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{
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if (sig) kill( thread->unix_pid, sig );
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if (sig) send_thread_signal( thread, sig );
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if (thread->suspend + thread->process->suspend) continue_thread( thread );
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}
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}
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@ -177,21 +195,21 @@ void detach_thread( struct thread *thread, int sig )
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void stop_thread( struct thread *thread )
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{
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/* can't stop a thread while initialisation is in progress */
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if (!thread->unix_pid || !is_process_init_done(thread->process)) return;
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if (thread->unix_pid == -1 || !is_process_init_done(thread->process)) return;
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/* first try to attach to it */
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if (!thread->attached)
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if (attach_thread( thread )) return; /* this will have stopped it */
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/* attached already, or attach failed -> send a signal */
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if (!thread->unix_pid) return;
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kill( thread->unix_pid, SIGSTOP );
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if (thread->unix_pid == -1) return;
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send_thread_signal( thread, SIGSTOP );
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if (thread->attached) wait4_thread( thread, SIGSTOP );
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}
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/* make a thread continue (at the Unix level) */
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void continue_thread( struct thread *thread )
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{
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if (!thread->unix_pid) return;
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if (!thread->attached) kill( thread->unix_pid, SIGCONT );
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if (thread->unix_pid == -1) return;
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if (!thread->attached) send_thread_signal( thread, SIGCONT );
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else ptrace( get_thread_single_step(thread) ? PTRACE_SINGLESTEP : PTRACE_CONT,
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thread->unix_pid, (caddr_t)1, SIGSTOP );
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}
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@ -206,7 +224,7 @@ int suspend_for_ptrace( struct thread *thread )
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return 1;
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}
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/* can't stop a thread while initialisation is in progress */
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if (!thread->unix_pid || !is_process_init_done(thread->process)) goto error;
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if (thread->unix_pid == -1 || !is_process_init_done(thread->process)) goto error;
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thread->suspend++;
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if (attach_thread( thread )) return 1;
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thread->suspend--;
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@ -108,7 +108,7 @@ inline static void init_thread_structure( struct thread *thread )
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{
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int i;
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thread->unix_pid = 0; /* not known yet */
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thread->unix_pid = -1; /* not known yet */
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thread->context = NULL;
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thread->teb = NULL;
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thread->mutex = NULL;
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@ -814,7 +814,7 @@ DECL_HANDLER(init_thread)
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int reply_fd = thread_get_inflight_fd( current, req->reply_fd );
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int wait_fd = thread_get_inflight_fd( current, req->wait_fd );
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if (current->unix_pid)
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if (current->unix_pid != -1)
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{
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fatal_protocol_error( current, "init_thread: already running\n" );
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goto error;
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@ -135,6 +135,7 @@ extern int read_thread_int( struct thread *thread, const int *addr, int *data );
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extern int write_thread_int( struct thread *thread, int *addr, int data, unsigned int mask );
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extern void *get_thread_ip( struct thread *thread );
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extern int get_thread_single_step( struct thread *thread );
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extern int send_thread_signal( struct thread *thread, int sig );
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extern unsigned int global_error; /* global error code for when no thread is current */
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