/* Wait for the inferior process to change state.
STATUS will be filled in with a response code to send to GDB.
Returns the signal which caused the process to stop. */
static ptid_t
win32_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
{
struct regcache *regcache;
while (1)
{
if (!get_child_debug_event (ourstatus))
continue;
switch (ourstatus->kind)
{
case TARGET_WAITKIND_EXITED:
OUTMSG2 (("Child exited with retcode = %x\n",
ourstatus->value.integer));
win32_clear_inferiors ();
return pid_to_ptid (current_event.dwProcessId);
case TARGET_WAITKIND_STOPPED:
case TARGET_WAITKIND_LOADED:
OUTMSG2 (("Child Stopped with signal = %d \n",
ourstatus->value.sig));
regcache = get_thread_regcache (current_inferior, 1);
child_fetch_inferior_registers (regcache, -1);
if (ourstatus->kind == TARGET_WAITKIND_LOADED
&& !server_waiting)
{
/* When gdb connects, we want to be stopped at the
initial breakpoint, not in some dll load event. */
child_continue (DBG_CONTINUE, -1);
break;
}
/* We don't expose _LOADED events to gdbserver core. See
the `dlls_changed' global. */
if (ourstatus->kind == TARGET_WAITKIND_LOADED)
ourstatus->kind = TARGET_WAITKIND_STOPPED;
return debug_event_ptid (¤t_event);
default:
OUTMSG (("Ignoring unknown internal event, %d\n", ourstatus->kind));
/* fall-through */
case TARGET_WAITKIND_SPURIOUS:
case TARGET_WAITKIND_EXECD:
/* do nothing, just continue */
child_continue (DBG_CONTINUE, -1);
break;
}
}
}
/* Wait for the inferior process to change state.
STATUS will be filled in with a response code to send to GDB.
Returns the signal which caused the process to stop. */
static unsigned char
win32_wait (char *status)
{
struct target_waitstatus our_status;
*status = 'T';
while (1)
{
if (!get_child_debug_event (&our_status))
continue;
switch (our_status.kind)
{
case TARGET_WAITKIND_EXITED:
OUTMSG2 (("Child exited with retcode = %x\n",
our_status.value.integer));
*status = 'W';
win32_clear_inferiors ();
return our_status.value.integer;
case TARGET_WAITKIND_STOPPED:
case TARGET_WAITKIND_LOADED:
OUTMSG2 (("Child Stopped with signal = %d \n",
our_status.value.sig));
*status = 'T';
child_fetch_inferior_registers (-1);
if (our_status.kind == TARGET_WAITKIND_LOADED
&& !server_waiting)
{
/* When gdb connects, we want to be stopped at the
initial breakpoint, not in some dll load event. */
child_continue (DBG_CONTINUE, -1);
break;
}
return our_status.value.sig;
default:
OUTMSG (("Ignoring unknown internal event, %d\n", our_status.kind));
/* fall-through */
case TARGET_WAITKIND_SPURIOUS:
case TARGET_WAITKIND_EXECD:
/* do nothing, just continue */
child_continue (DBG_CONTINUE, -1);
break;
}
}
}
/* Kill all inferiors. */
static int
win32_kill (int pid)
{
struct process_info *process;
if (current_process_handle == NULL)
return -1;
TerminateProcess (current_process_handle, 0);
for (;;)
{
if (!child_continue (DBG_CONTINUE, -1))
break;
if (!WaitForDebugEvent (¤t_event, INFINITE))
break;
if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
break;
else if (current_event.dwDebugEventCode == OUTPUT_DEBUG_STRING_EVENT)
{
struct target_waitstatus our_status = { 0 };
handle_output_debug_string (&our_status);
}
}
win32_clear_inferiors ();
process = find_process_pid (pid);
remove_process (process);
return 0;
}
/* Wait for the inferior process to change state.
STATUS will be filled in with a response code to send to GDB.
Returns the signal which caused the process to stop. */
static ptid_t
win32_wait (ptid_t ptid, struct target_waitstatus *ourstatus, int options)
{
struct regcache *regcache;
if (cached_status.kind != TARGET_WAITKIND_IGNORE)
{
/* The core always does a wait after creating the inferior, and
do_initial_child_stuff already ran the inferior to the
initial breakpoint (or an exit, if creating the process
fails). Report it now. */
*ourstatus = cached_status;
cached_status.kind = TARGET_WAITKIND_IGNORE;
return debug_event_ptid (¤t_event);
}
while (1)
{
if (!get_child_debug_event (ourstatus))
continue;
switch (ourstatus->kind)
{
case TARGET_WAITKIND_EXITED:
OUTMSG2 (("Child exited with retcode = %x\n",
ourstatus->value.integer));
win32_clear_inferiors ();
return pid_to_ptid (current_event.dwProcessId);
case TARGET_WAITKIND_STOPPED:
case TARGET_WAITKIND_LOADED:
OUTMSG2 (("Child Stopped with signal = %d \n",
ourstatus->value.sig));
regcache = get_thread_regcache (current_thread, 1);
child_fetch_inferior_registers (regcache, -1);
return debug_event_ptid (¤t_event);
default:
OUTMSG (("Ignoring unknown internal event, %d\n", ourstatus->kind));
/* fall-through */
case TARGET_WAITKIND_SPURIOUS:
case TARGET_WAITKIND_EXECD:
/* do nothing, just continue */
child_continue (DBG_CONTINUE, -1);
break;
}
}
}
int main(int argc, char **argv) {
wshd_t *w;
int rv;
/* Continue child execution in the context of the container */
if (argc > 1 && strcmp(argv[1], "--continue") == 0) {
return child_continue(argc, argv);
}
w = calloc(1, sizeof(*w));
assert(w != NULL);
rv = wshd__getopt(w, argc, argv);
if (rv == -1) {
exit(1);
}
if (strlen(w->run_path) == 0) {
strcpy(w->run_path, "run");
}
if (strlen(w->lib_path) == 0) {
strcpy(w->lib_path, "lib");
}
if (strlen(w->root_path) == 0) {
strcpy(w->root_path, "root");
}
assert_directory(w->run_path);
assert_directory(w->lib_path);
assert_directory(w->root_path);
parent_run(w);
return 0;
}
/* Resume the inferior process. RESUME_INFO describes how we want
to resume. */
static void
win32_resume (struct thread_resume *resume_info, size_t n)
{
DWORD tid;
enum target_signal sig;
int step;
win32_thread_info *th;
DWORD continue_status = DBG_CONTINUE;
ptid_t ptid;
/* This handles the very limited set of resume packets that GDB can
currently produce. */
if (n == 1 && ptid_equal (resume_info[0].thread, minus_one_ptid))
tid = -1;
else if (n > 1)
tid = -1;
else
/* Yes, we're ignoring resume_info[0].thread. It'd be tricky to make
the Windows resume code do the right thing for thread switching. */
tid = current_event.dwThreadId;
if (!ptid_equal (resume_info[0].thread, minus_one_ptid))
{
sig = resume_info[0].sig;
step = resume_info[0].kind == resume_step;
}
else
{
sig = 0;
step = 0;
}
if (sig != TARGET_SIGNAL_0)
{
if (current_event.dwDebugEventCode != EXCEPTION_DEBUG_EVENT)
{
OUTMSG (("Cannot continue with signal %d here.\n", sig));
}
else if (sig == last_sig)
continue_status = DBG_EXCEPTION_NOT_HANDLED;
else
OUTMSG (("Can only continue with recieved signal %d.\n", last_sig));
}
last_sig = TARGET_SIGNAL_0;
/* Get context for the currently selected thread. */
ptid = debug_event_ptid (¤t_event);
th = thread_rec (ptid, FALSE);
if (th)
{
if (th->context.ContextFlags)
{
/* Move register values from the inferior into the thread
context structure. */
regcache_invalidate ();
if (step)
{
if (the_low_target.single_step != NULL)
(*the_low_target.single_step) (th);
else
error ("Single stepping is not supported "
"in this configuration.\n");
}
win32_set_thread_context (th);
th->context.ContextFlags = 0;
}
}
/* Allow continuing with the same signal that interrupted us.
Otherwise complain. */
child_continue (continue_status, tid);
}
static int
get_child_debug_event (struct target_waitstatus *ourstatus)
{
ptid_t ptid;
last_sig = TARGET_SIGNAL_0;
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
/* Check if GDB sent us an interrupt request. */
check_remote_input_interrupt_request ();
if (soft_interrupt_requested)
{
soft_interrupt_requested = 0;
fake_breakpoint_event ();
goto gotevent;
}
#ifndef _WIN32_WCE
attaching = 0;
#else
if (attaching)
{
/* WinCE doesn't set an initial breakpoint automatically. To
stop the inferior, we flush all currently pending debug
events -- the thread list and the dll list are always
reported immediatelly without delay, then, we suspend all
threads and pretend we saw a trap at the current PC of the
main thread.
Contrary to desktop Windows, Windows CE *does* report the dll
names on LOAD_DLL_DEBUG_EVENTs resulting from a
DebugActiveProcess call. This limits the way we can detect
if all the dlls have already been reported. If we get a real
debug event before leaving attaching, the worst that will
happen is the user will see a spurious breakpoint. */
current_event.dwDebugEventCode = 0;
if (!WaitForDebugEvent (¤t_event, 0))
{
OUTMSG2(("no attach events left\n"));
fake_breakpoint_event ();
attaching = 0;
}
else
OUTMSG2(("got attach event\n"));
}
else
#endif
{
/* Keep the wait time low enough for confortable remote
interruption, but high enough so gdbserver doesn't become a
bottleneck. */
if (!WaitForDebugEvent (¤t_event, 250))
{
DWORD e = GetLastError();
if (e == ERROR_PIPE_NOT_CONNECTED)
{
/* This will happen if the loader fails to succesfully
load the application, e.g., if the main executable
tries to pull in a non-existing export from a
DLL. */
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = 1;
return 1;
}
return 0;
}
}
gotevent:
switch (current_event.dwDebugEventCode)
{
case CREATE_THREAD_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event CREATE_THREAD_DEBUG_EVENT "
"for pid=%d tid=%x)\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
/* Record the existence of this thread. */
child_add_thread (current_event.dwProcessId,
current_event.dwThreadId,
current_event.u.CreateThread.hThread,
current_event.u.CreateThread.lpThreadLocalBase);
break;
case EXIT_THREAD_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXIT_THREAD_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
child_delete_thread (current_event.dwProcessId,
current_event.dwThreadId);
current_inferior = (struct thread_info *) all_threads.head;
return 1;
case CREATE_PROCESS_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event CREATE_PROCESS_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
CloseHandle (current_event.u.CreateProcessInfo.hFile);
current_process_handle = current_event.u.CreateProcessInfo.hProcess;
main_thread_id = current_event.dwThreadId;
ourstatus->kind = TARGET_WAITKIND_EXECD;
ourstatus->value.execd_pathname = "Main executable";
/* Add the main thread. */
child_add_thread (current_event.dwProcessId,
main_thread_id,
current_event.u.CreateProcessInfo.hThread,
current_event.u.CreateProcessInfo.lpThreadLocalBase);
ourstatus->value.related_pid = debug_event_ptid (¤t_event);
#ifdef _WIN32_WCE
if (!attaching)
{
/* Windows CE doesn't set the initial breakpoint
automatically like the desktop versions of Windows do.
We add it explicitly here. It will be removed as soon as
it is hit. */
set_breakpoint_at ((CORE_ADDR) (long) current_event.u
.CreateProcessInfo.lpStartAddress,
auto_delete_breakpoint);
}
#endif
break;
case EXIT_PROCESS_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXIT_PROCESS_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
ourstatus->kind = TARGET_WAITKIND_EXITED;
ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode;
child_continue (DBG_CONTINUE, -1);
CloseHandle (current_process_handle);
current_process_handle = NULL;
break;
case LOAD_DLL_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event LOAD_DLL_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
CloseHandle (current_event.u.LoadDll.hFile);
handle_load_dll ();
ourstatus->kind = TARGET_WAITKIND_LOADED;
ourstatus->value.sig = TARGET_SIGNAL_TRAP;
break;
case UNLOAD_DLL_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event UNLOAD_DLL_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
handle_unload_dll ();
ourstatus->kind = TARGET_WAITKIND_LOADED;
ourstatus->value.sig = TARGET_SIGNAL_TRAP;
break;
case EXCEPTION_DEBUG_EVENT:
OUTMSG2 (("gdbserver: kernel event EXCEPTION_DEBUG_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
handle_exception (ourstatus);
break;
case OUTPUT_DEBUG_STRING_EVENT:
/* A message from the kernel (or Cygwin). */
OUTMSG2 (("gdbserver: kernel event OUTPUT_DEBUG_STRING_EVENT "
"for pid=%d tid=%x\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId));
handle_output_debug_string (ourstatus);
break;
default:
OUTMSG2 (("gdbserver: kernel event unknown "
"for pid=%d tid=%x code=%ld\n",
(unsigned) current_event.dwProcessId,
(unsigned) current_event.dwThreadId,
current_event.dwDebugEventCode));
break;
}
ptid = debug_event_ptid (¤t_event);
current_inferior =
(struct thread_info *) find_inferior_id (&all_threads, ptid);
return 1;
}
int main(int argc, char *argv[]) {
int backlog = 10;
muxer_t *muxers[2] = {NULL, NULL};
status_writer_t *sw = NULL;
child_t *child = NULL;
int child_status = -1;
int ring_buffer_size = 65535;
int fds[3] = {-1, -1, -1};
int ii = 0, exit_status = 0, nwritten = 0;
pthread_t sw_thread, muxer_threads[2];
char socket_paths[3][PATH_MAX + 1];
char *socket_names[3] = { "stdout.sock", "stderr.sock", "status.sock" };
barrier_t *barrier = NULL;
if (argc < 3) {
fprintf(stderr, "Usage: %s <socket directory> <cmd>\n", argv[0]);
exit(EXIT_FAILURE);
}
/* Setup listeners on domain sockets */
for (ii = 0; ii < 3; ++ii) {
memset(socket_paths[ii], 0, sizeof(socket_paths[ii]));
nwritten = snprintf(socket_paths[ii], sizeof(socket_paths[ii]),
"%s/%s", argv[1], socket_names[ii]);
if (nwritten >= sizeof(socket_paths[ii])) {
fprintf(stderr, "Socket path too long\n");
exit_status = 1;
goto cleanup;
}
fds[ii] = create_unix_domain_listener(socket_paths[ii], backlog);
DLOG("created listener, path=%s fd=%d", socket_paths[ii], fds[ii]);
if (-1 == fds[ii]) {
perrorf("Failed creating socket at %s:", socket_paths[ii]);
exit_status = 1;
goto cleanup;
}
set_cloexec(fds[ii]);
}
child = child_create(argv + 2, argc - 2);
printf("child_pid=%d\n", child->pid);
fflush(stdout);
/* Muxers for stdout/stderr */
muxers[0] = muxer_alloc(fds[0], child->stdout[0], ring_buffer_size);
muxers[1] = muxer_alloc(fds[1], child->stderr[0], ring_buffer_size);
for (ii = 0; ii < 2; ++ii) {
if (pthread_create(&muxer_threads[ii], NULL, run_muxer, muxers[ii])) {
perrorf("Failed creating muxer thread:");
exit_status = 1;
goto cleanup;
}
DLOG("created muxer thread for socket=%s", socket_paths[ii]);
}
/* Status writer */
barrier = barrier_alloc();
sw = status_writer_alloc(fds[2], barrier);
if (pthread_create(&sw_thread, NULL, run_status_writer, sw)) {
perrorf("Failed creating muxer thread:");
exit_status = 1;
goto cleanup;
}
/* Wait for clients on stdout, stderr, and status */
for (ii = 0; ii < 2; ++ii) {
muxer_wait_for_client(muxers[ii]);
}
barrier_wait(barrier);
child_continue(child);
printf("child active\n");
fflush(stdout);
if (-1 == waitpid(child->pid, &child_status, 0)) {
perrorf("Waitpid for child failed: ");
exit_status = 1;
goto cleanup;
}
DLOG("child exited, status = %d", WEXITSTATUS(child_status));
/* Wait for status writer */
status_writer_finish(sw, child_status);
pthread_join(sw_thread, NULL);
/* Wait for muxers */
for (ii = 0; ii < 2; ++ii) {
muxer_stop(muxers[ii]);
pthread_join(muxer_threads[ii], NULL);
}
DLOG("all done, cleaning up and exiting");
cleanup:
if (NULL != child) {
child_free(child);
}
if (NULL != barrier) {
barrier_free(barrier);
}
if (NULL != sw) {
status_writer_free(sw);
}
for (ii = 0; ii < 2; ++ii) {
if (NULL != muxers[ii]) {
muxer_free(muxers[ii]);
}
}
/* Close accept sockets and clean up paths */
for (ii = 0; ii < 3; ++ii) {
if (-1 != fds[ii]) {
close(fds[ii]);
unlink(socket_paths[ii]);
}
}
return exit_status;
}