5 bool set_memory_locked(cell base, cell size, bool locked) {
6 int prot = locked ? PROT_NONE : PROT_READ | PROT_WRITE;
7 int status = mprotect((char*)base, size, prot);
11 THREADHANDLE start_thread(void* (*start_routine)(void*), void* args) {
14 if (pthread_attr_init(&attr) != 0)
15 fatal_error("pthread_attr_init() failed", 0);
16 if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) != 0)
17 fatal_error("pthread_attr_setdetachstate() failed", 0);
18 if (pthread_create(&thread, &attr, start_routine, args) != 0)
19 fatal_error("pthread_create() failed", 0);
20 pthread_attr_destroy(&attr);
24 static void* null_dll;
26 void sleep_nanos(uint64_t nsec) {
30 ts.tv_sec = nsec / 1000000000;
31 ts.tv_nsec = nsec % 1000000000;
32 ret = nanosleep(&ts, &ts_rem);
33 while (ret == -1 && errno == EINTR) {
34 memcpy(&ts, &ts_rem, sizeof(ts));
35 ret = nanosleep(&ts, &ts_rem);
39 fatal_error("nanosleep failed", 0);
42 void factor_vm::init_ffi() { null_dll = dlopen(NULL, RTLD_LAZY); }
44 void factor_vm::ffi_dlopen(dll* dll) {
45 dll->handle = dlopen(alien_offset(dll->path), RTLD_LAZY | RTLD_GLOBAL);
48 cell factor_vm::ffi_dlsym_raw(dll* dll, symbol_char* symbol) {
49 return (cell)dlsym(dll ? dll->handle : null_dll, symbol);
52 cell factor_vm::ffi_dlsym(dll* dll, symbol_char* symbol) {
53 return FUNCTION_CODE_POINTER(ffi_dlsym_raw(dll, symbol));
56 void factor_vm::ffi_dlclose(dll* dll) {
57 if (dlclose(dll->handle))
58 general_error(ERROR_FFI, false_object, false_object);
62 void factor_vm::primitive_existsp() {
64 char* path = (char*)(untag_check<byte_array>(ctx->pop()) + 1);
65 ctx->push(tag_boolean(stat(path, &sb) >= 0));
68 bool move_file(const vm_char* path1, const vm_char* path2) {
71 ret = rename((path1), (path2));
72 } while (ret < 0 && errno == EINTR);
77 segment::segment(cell size_, bool executable_p) {
80 int pagesize = getpagesize();
84 prot = PROT_READ | PROT_WRITE | PROT_EXEC;
86 prot = PROT_READ | PROT_WRITE;
88 cell alloc_size = 2 * pagesize + size;
89 #if defined(__APPLE__) && defined(FACTOR_ARM64) // FIXME: could be in header file
90 char* array = (char*)mmap(NULL, alloc_size, prot,
91 MAP_ANON | MAP_PRIVATE | MAP_JIT, -1, 0);
93 char* array = (char*)mmap(NULL, alloc_size, prot,
94 MAP_ANON | MAP_PRIVATE, -1, 0);
97 if (array == (char*)-1)
98 fatal_error("Out of memory in mmap", alloc_size);
100 start = (cell)(array + pagesize);
103 set_border_locked(true);
106 segment::~segment() {
107 int pagesize = getpagesize();
108 int retval = munmap((void*)(start - pagesize), 2 * pagesize + size);
110 fatal_error("Segment deallocation failed", 0);
113 void factor_vm::start_sampling_profiler_timer() {
114 struct itimerval timer;
115 memset((void*)&timer, 0, sizeof(struct itimerval));
116 timer.it_value.tv_usec = 1000000 / samples_per_second;
117 timer.it_interval.tv_usec = 1000000 / samples_per_second;
118 setitimer(ITIMER_REAL, &timer, NULL);
121 void factor_vm::end_sampling_profiler_timer() {
122 struct itimerval timer;
123 memset((void*)&timer, 0, sizeof(struct itimerval));
124 setitimer(ITIMER_REAL, &timer, NULL);
127 void factor_vm::dispatch_signal(void* uap, void(handler)()) {
128 dispatch_signal_handler((cell*)&UAP_STACK_POINTER(uap),
129 (cell*)&UAP_PROGRAM_COUNTER(uap),
130 (cell)FUNCTION_CODE_POINTER(handler));
133 void memory_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
135 cell fault_addr = (cell)siginfo->si_addr;
136 cell fault_pc = (cell)UAP_PROGRAM_COUNTER(uap);
137 factor_vm* vm = current_vm();
138 vm->set_memory_protection_error(fault_addr, fault_pc);
139 vm->dispatch_signal(uap, factor::memory_signal_handler_impl);
142 void synchronous_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
144 if (factor_vm::fatal_erroring_p)
147 factor_vm* vm = current_vm_p();
149 fatal_error("Foreign thread received signal", signal);
150 vm->signal_number = signal;
151 vm->dispatch_signal(uap, factor::synchronous_signal_handler_impl);
154 void safe_write_nonblock(int fd, void* data, ssize_t size);
156 static void enqueue_signal(factor_vm* vm, int signal) {
157 if (vm->signal_pipe_output != 0)
158 safe_write_nonblock(vm->signal_pipe_output, &signal, sizeof(int));
161 void enqueue_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
164 if (factor_vm::fatal_erroring_p)
167 factor_vm* vm = current_vm_p();
169 enqueue_signal(vm, signal);
172 void fep_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
175 if (factor_vm::fatal_erroring_p)
178 factor_vm* vm = current_vm_p();
181 enqueue_signal(vm, signal);
183 fatal_error("Foreign thread received signal", signal);
186 void sample_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
188 factor_vm* vm = current_vm_p();
189 bool foreign_thread = false;
191 foreign_thread = true;
192 vm = thread_vms.begin()->second;
194 if (atomic::load(&vm->sampling_profiler_p))
195 vm->enqueue_samples(1, (cell)UAP_PROGRAM_COUNTER(uap), foreign_thread);
196 else if (!foreign_thread)
197 enqueue_signal(vm, signal);
200 void ignore_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
206 void fpe_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
207 factor_vm* vm = current_vm();
208 vm->signal_number = signal;
209 vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
210 uap_clear_fpu_status(uap);
213 uap, (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
214 ? factor::synchronous_signal_handler_impl
215 : factor::fp_signal_handler_impl);
218 static void sigaction_safe(int signum, const struct sigaction* act,
219 struct sigaction* oldact) {
222 ret = sigaction(signum, act, oldact);
223 } while (ret == -1 && errno == EINTR);
226 fatal_error("sigaction failed", errno);
229 static void init_sigaction_with_handler(struct sigaction* act,
230 void (*handler)(int, siginfo_t*,
232 memset(act, 0, sizeof(struct sigaction));
233 sigemptyset(&act->sa_mask);
234 act->sa_sigaction = handler;
235 act->sa_flags = SA_SIGINFO | SA_ONSTACK;
238 static void safe_pipe(int* in, int* out) {
241 if (pipe(filedes) < 0)
242 fatal_error("Error opening pipe", errno);
247 if (fcntl(*in, F_SETFD, FD_CLOEXEC) < 0)
248 fatal_error("Error with fcntl", errno);
250 if (fcntl(*out, F_SETFD, FD_CLOEXEC) < 0)
251 fatal_error("Error with fcntl", errno);
254 static void init_signal_pipe(factor_vm* vm) {
255 safe_pipe(&vm->signal_pipe_input, &vm->signal_pipe_output);
257 if (fcntl(vm->signal_pipe_output, F_SETFL, O_NONBLOCK) < 0)
258 fatal_error("Error with fcntl", errno);
260 vm->special_objects[OBJ_SIGNAL_PIPE] = tag_fixnum(vm->signal_pipe_input);
263 void factor_vm::unix_init_signals() {
264 init_signal_pipe(this);
266 signal_callstack_seg = new segment(callstack_size, false);
268 stack_t signal_callstack;
269 signal_callstack.ss_sp = (char*)signal_callstack_seg->start;
270 signal_callstack.ss_size = signal_callstack_seg->size;
271 signal_callstack.ss_flags = 0;
273 if (sigaltstack(&signal_callstack, (stack_t*)NULL) < 0)
274 fatal_error("sigaltstack() failed", 0);
277 struct sigaction memory_sigaction;
278 init_sigaction_with_handler(&memory_sigaction, memory_signal_handler);
279 sigaction_safe(SIGBUS, &memory_sigaction, NULL);
280 sigaction_safe(SIGSEGV, &memory_sigaction, NULL);
281 sigaction_safe(SIGTRAP, &memory_sigaction, NULL);
285 struct sigaction fpe_sigaction;
286 init_sigaction_with_handler(&fpe_sigaction, fpe_signal_handler);
287 sigaction_safe(SIGFPE, &fpe_sigaction, NULL);
291 struct sigaction synchronous_sigaction;
292 init_sigaction_with_handler(&synchronous_sigaction,
293 synchronous_signal_handler);
294 sigaction_safe(SIGILL, &synchronous_sigaction, NULL);
295 sigaction_safe(SIGABRT, &synchronous_sigaction, NULL);
299 struct sigaction enqueue_sigaction;
300 init_sigaction_with_handler(&enqueue_sigaction, enqueue_signal_handler);
301 sigaction_safe(SIGWINCH, &enqueue_sigaction, NULL);
302 sigaction_safe(SIGUSR1, &enqueue_sigaction, NULL);
303 sigaction_safe(SIGCONT, &enqueue_sigaction, NULL);
304 sigaction_safe(SIGURG, &enqueue_sigaction, NULL);
305 sigaction_safe(SIGIO, &enqueue_sigaction, NULL);
306 sigaction_safe(SIGPROF, &enqueue_sigaction, NULL);
307 sigaction_safe(SIGVTALRM, &enqueue_sigaction, NULL);
309 sigaction_safe(SIGINFO, &enqueue_sigaction, NULL);
316 struct sigaction sample_sigaction;
317 init_sigaction_with_handler(&sample_sigaction, sample_signal_handler);
318 sigaction_safe(SIGALRM, &sample_sigaction, NULL);
321 // We don't use SA_IGN here because then the ignore action is inherited
322 // by subprocesses, which we don't want. There is a unit test in
323 // io.launcher.unix for this.
325 struct sigaction ignore_sigaction;
326 init_sigaction_with_handler(&ignore_sigaction, ignore_signal_handler);
327 sigaction_safe(SIGPIPE, &ignore_sigaction, NULL);
328 // We send SIGUSR2 to the stdin_loop thread to interrupt it on FEP
329 sigaction_safe(SIGUSR2, &ignore_sigaction, NULL);
333 // On Unix, shared fds such as stdin cannot be set to non-blocking mode
334 // (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
335 // so we kludge around this by spawning a thread, which waits on a control pipe
336 // for a signal, upon receiving this signal it reads one block of data from
337 // stdin and writes it to a data pipe. Upon completion, it writes a 4-byte
338 // integer to the size pipe, indicating how much data was written to the data
341 // The read end of the size pipe can be set to non-blocking.
352 bool stdin_thread_initialized_p = false;
353 THREADHANDLE stdin_thread;
354 pthread_mutex_t stdin_mutex;
357 void safe_close(int fd) {
359 fatal_error("error closing fd", errno);
362 bool check_write(int fd, void* data, ssize_t size) {
363 if (write(fd, data, size) == size)
366 return check_write(fd, data, size);
370 void safe_write(int fd, void* data, ssize_t size) {
371 if (!check_write(fd, data, size))
372 fatal_error("error writing fd", errno);
375 void safe_write_nonblock(int fd, void* data, ssize_t size) {
376 if (!check_write(fd, data, size) && errno != EAGAIN)
377 fatal_error("error writing fd", errno);
380 bool safe_read(int fd, void* data, ssize_t size) {
381 ssize_t bytes = read(fd, data, size);
384 return safe_read(fd, data, size);
386 fatal_error("error reading fd", errno);
390 return (bytes == size);
393 void* stdin_loop(void* arg) {
395 unsigned char buf[4096];
396 bool loop_running = true;
400 sigdelset(&mask, SIGUSR2);
401 sigdelset(&mask, SIGTTIN);
402 sigdelset(&mask, SIGTERM);
403 sigdelset(&mask, SIGQUIT);
404 pthread_sigmask(SIG_SETMASK, &mask, NULL);
407 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &unused);
408 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &unused);
410 while (loop_running) {
411 if (!safe_read(control_read, buf, 1))
415 fatal_error("stdin_loop: bad data on control fd", buf[0]);
418 // If we fep, the parent thread will grab stdin_mutex and send us
419 // SIGUSR2 to interrupt the read() call.
420 pthread_mutex_lock(&stdin_mutex);
421 pthread_mutex_unlock(&stdin_mutex);
422 ssize_t bytes = read(0, buf, sizeof(buf));
427 loop_running = false;
430 } else if (bytes >= 0) {
431 safe_write(size_write, &bytes, sizeof(bytes));
433 if (!check_write(stdin_write, buf, bytes))
434 loop_running = false;
440 safe_close(stdin_write);
441 safe_close(control_read);
446 void open_console() {
447 FACTOR_ASSERT(!stdin_thread_initialized_p);
448 safe_pipe(&control_read, &control_write);
449 safe_pipe(&size_read, &size_write);
450 safe_pipe(&stdin_read, &stdin_write);
451 stdin_thread = start_thread(stdin_loop, NULL);
452 stdin_thread_initialized_p = true;
453 pthread_mutex_init(&stdin_mutex, NULL);
456 // This method is used to kill the stdin_loop before exiting from factor.
457 // An Nvidia driver bug on Linux is the reason this has to be done, see:
458 // http://www.nvnews.net/vbulletin/showthread.php?t=164619
459 void close_console() {
460 if (stdin_thread_initialized_p) {
461 pthread_cancel(stdin_thread);
462 pthread_join(stdin_thread, 0);
466 void lock_console() {
467 FACTOR_ASSERT(stdin_thread_initialized_p);
468 // Lock the stdin_mutex and send the stdin_loop thread a signal to interrupt
469 // any read() it has in progress. When the stdin loop iterates again, it will
470 // try to lock the same mutex and wait until unlock_console() is called.
471 pthread_mutex_lock(&stdin_mutex);
472 pthread_kill(stdin_thread, SIGUSR2);
475 void unlock_console() {
476 FACTOR_ASSERT(stdin_thread_initialized_p);
477 pthread_mutex_unlock(&stdin_mutex);
480 void ignore_ctrl_c() {
483 ret = signal(SIGINT, SIG_DFL);
484 } while (ret == SIG_ERR && errno == EINTR);
487 void handle_ctrl_c() {
488 struct sigaction fep_sigaction;
489 init_sigaction_with_handler(&fep_sigaction, fep_signal_handler);
490 sigaction_safe(SIGINT, &fep_sigaction, NULL);
493 void factor_vm::primitive_disable_ctrl_break() {
494 stop_on_ctrl_break = false;
497 void factor_vm::primitive_enable_ctrl_break() {
498 stop_on_ctrl_break = true;
504 ret = signal(SIGABRT, SIG_DFL);
505 } while (ret == SIG_ERR && errno == EINTR);