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();
82 #if defined(__APPLE__) && defined(FACTOR_ARM64)
83 int prot = PROT_READ | PROT_WRITE;
84 int flags = MAP_ANON | MAP_PRIVATE | MAP_JIT;
88 prot = PROT_READ | PROT_WRITE | PROT_EXEC;
90 prot = PROT_READ | PROT_WRITE;
91 int flags = MAP_ANON | MAP_PRIVATE;
94 cell alloc_size = 2 * pagesize + size;
95 char* array = (char*)mmap(NULL, alloc_size, prot, flags, -1, 0);
97 if (array == (char*)-1)
98 fatal_error("Out of memory in mmap", alloc_size);
100 start = (cell)(array + pagesize);
103 #if defined(__APPLE__) && defined(FACTOR_ARM64)
105 if (mprotect((char*)start, size, prot | PROT_EXEC) == -1)
106 fatal_error("mprotect executable page failed", 0);
110 set_border_locked(true);
113 segment::~segment() {
114 int pagesize = getpagesize();
115 int retval = munmap((void*)(start - pagesize), 2 * pagesize + size);
117 fatal_error("Segment deallocation failed", 0);
120 void factor_vm::start_sampling_profiler_timer() {
121 struct itimerval timer;
122 memset((void*)&timer, 0, sizeof(struct itimerval));
123 timer.it_value.tv_usec = 1000000 / samples_per_second;
124 timer.it_interval.tv_usec = 1000000 / samples_per_second;
125 setitimer(ITIMER_REAL, &timer, NULL);
128 void factor_vm::end_sampling_profiler_timer() {
129 struct itimerval timer;
130 memset((void*)&timer, 0, sizeof(struct itimerval));
131 setitimer(ITIMER_REAL, &timer, NULL);
134 void factor_vm::dispatch_signal(void* uap, void(handler)()) {
135 dispatch_signal_handler((cell*)&UAP_STACK_POINTER(uap),
136 (cell*)&UAP_PROGRAM_COUNTER(uap),
137 (cell)FUNCTION_CODE_POINTER(handler));
140 void memory_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
142 cell fault_addr = (cell)siginfo->si_addr;
143 cell fault_pc = (cell)UAP_PROGRAM_COUNTER(uap);
144 factor_vm* vm = current_vm();
145 vm->set_memory_protection_error(fault_addr, fault_pc);
146 vm->dispatch_signal(uap, factor::memory_signal_handler_impl);
149 void synchronous_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
151 if (factor_vm::fatal_erroring_p)
154 factor_vm* vm = current_vm_p();
156 fatal_error("Foreign thread received signal", signal);
157 vm->signal_number = signal;
158 vm->dispatch_signal(uap, factor::synchronous_signal_handler_impl);
161 void safe_write_nonblock(int fd, void* data, ssize_t size);
163 static void enqueue_signal(factor_vm* vm, int signal) {
164 if (vm->signal_pipe_output != 0)
165 safe_write_nonblock(vm->signal_pipe_output, &signal, sizeof(int));
168 void enqueue_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
171 if (factor_vm::fatal_erroring_p)
174 factor_vm* vm = current_vm_p();
176 enqueue_signal(vm, signal);
179 void fep_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
182 if (factor_vm::fatal_erroring_p)
185 factor_vm* vm = current_vm_p();
188 enqueue_signal(vm, signal);
190 fatal_error("Foreign thread received signal", signal);
193 void sample_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
195 factor_vm* vm = current_vm_p();
196 bool foreign_thread = false;
198 foreign_thread = true;
199 vm = thread_vms.begin()->second;
201 if (atomic::load(&vm->sampling_profiler_p))
202 vm->enqueue_samples(1, (cell)UAP_PROGRAM_COUNTER(uap), foreign_thread);
203 else if (!foreign_thread)
204 enqueue_signal(vm, signal);
207 void ignore_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
213 void fpe_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
214 factor_vm* vm = current_vm();
215 vm->signal_number = signal;
216 vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
217 uap_clear_fpu_status(uap);
220 uap, (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
221 ? factor::synchronous_signal_handler_impl
222 : factor::fp_signal_handler_impl);
225 static void sigaction_safe(int signum, const struct sigaction* act,
226 struct sigaction* oldact) {
229 ret = sigaction(signum, act, oldact);
230 } while (ret == -1 && errno == EINTR);
233 fatal_error("sigaction failed", errno);
236 static void init_sigaction_with_handler(struct sigaction* act,
237 void (*handler)(int, siginfo_t*,
239 memset(act, 0, sizeof(struct sigaction));
240 sigemptyset(&act->sa_mask);
241 act->sa_sigaction = handler;
242 act->sa_flags = SA_SIGINFO | SA_ONSTACK;
245 static void safe_pipe(int* in, int* out) {
248 if (pipe(filedes) < 0)
249 fatal_error("Error opening pipe", errno);
254 if (fcntl(*in, F_SETFD, FD_CLOEXEC) < 0)
255 fatal_error("Error with fcntl", errno);
257 if (fcntl(*out, F_SETFD, FD_CLOEXEC) < 0)
258 fatal_error("Error with fcntl", errno);
261 static void init_signal_pipe(factor_vm* vm) {
262 safe_pipe(&vm->signal_pipe_input, &vm->signal_pipe_output);
264 if (fcntl(vm->signal_pipe_output, F_SETFL, O_NONBLOCK) < 0)
265 fatal_error("Error with fcntl", errno);
267 vm->special_objects[OBJ_SIGNAL_PIPE] = tag_fixnum(vm->signal_pipe_input);
270 void factor_vm::unix_init_signals() {
271 init_signal_pipe(this);
273 signal_callstack_seg = new segment(callstack_size, false);
275 stack_t signal_callstack;
276 signal_callstack.ss_sp = (char*)signal_callstack_seg->start;
277 signal_callstack.ss_size = signal_callstack_seg->size;
278 signal_callstack.ss_flags = 0;
280 if (sigaltstack(&signal_callstack, (stack_t*)NULL) < 0)
281 fatal_error("sigaltstack() failed", 0);
284 struct sigaction memory_sigaction;
285 init_sigaction_with_handler(&memory_sigaction, memory_signal_handler);
286 sigaction_safe(SIGBUS, &memory_sigaction, NULL);
287 sigaction_safe(SIGSEGV, &memory_sigaction, NULL);
288 sigaction_safe(SIGTRAP, &memory_sigaction, NULL);
292 struct sigaction fpe_sigaction;
293 init_sigaction_with_handler(&fpe_sigaction, fpe_signal_handler);
294 sigaction_safe(SIGFPE, &fpe_sigaction, NULL);
298 struct sigaction synchronous_sigaction;
299 init_sigaction_with_handler(&synchronous_sigaction,
300 synchronous_signal_handler);
301 sigaction_safe(SIGILL, &synchronous_sigaction, NULL);
302 sigaction_safe(SIGABRT, &synchronous_sigaction, NULL);
306 struct sigaction enqueue_sigaction;
307 init_sigaction_with_handler(&enqueue_sigaction, enqueue_signal_handler);
308 sigaction_safe(SIGWINCH, &enqueue_sigaction, NULL);
309 sigaction_safe(SIGUSR1, &enqueue_sigaction, NULL);
310 sigaction_safe(SIGCONT, &enqueue_sigaction, NULL);
311 sigaction_safe(SIGURG, &enqueue_sigaction, NULL);
312 sigaction_safe(SIGIO, &enqueue_sigaction, NULL);
313 sigaction_safe(SIGPROF, &enqueue_sigaction, NULL);
314 sigaction_safe(SIGVTALRM, &enqueue_sigaction, NULL);
316 sigaction_safe(SIGINFO, &enqueue_sigaction, NULL);
323 struct sigaction sample_sigaction;
324 init_sigaction_with_handler(&sample_sigaction, sample_signal_handler);
325 sigaction_safe(SIGALRM, &sample_sigaction, NULL);
328 // We don't use SA_IGN here because then the ignore action is inherited
329 // by subprocesses, which we don't want. There is a unit test in
330 // io.launcher.unix for this.
332 struct sigaction ignore_sigaction;
333 init_sigaction_with_handler(&ignore_sigaction, ignore_signal_handler);
334 sigaction_safe(SIGPIPE, &ignore_sigaction, NULL);
335 // We send SIGUSR2 to the stdin_loop thread to interrupt it on FEP
336 sigaction_safe(SIGUSR2, &ignore_sigaction, NULL);
340 // On Unix, shared fds such as stdin cannot be set to non-blocking mode
341 // (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
342 // so we kludge around this by spawning a thread, which waits on a control pipe
343 // for a signal, upon receiving this signal it reads one block of data from
344 // stdin and writes it to a data pipe. Upon completion, it writes a 4-byte
345 // integer to the size pipe, indicating how much data was written to the data
348 // The read end of the size pipe can be set to non-blocking.
359 bool stdin_thread_initialized_p = false;
360 THREADHANDLE stdin_thread;
361 pthread_mutex_t stdin_mutex;
364 void safe_close(int fd) {
366 fatal_error("error closing fd", errno);
369 bool check_write(int fd, void* data, ssize_t size) {
370 if (write(fd, data, size) == size)
373 return check_write(fd, data, size);
377 void safe_write(int fd, void* data, ssize_t size) {
378 if (!check_write(fd, data, size))
379 fatal_error("error writing fd", errno);
382 void safe_write_nonblock(int fd, void* data, ssize_t size) {
383 if (!check_write(fd, data, size) && errno != EAGAIN)
384 fatal_error("error writing fd", errno);
387 bool safe_read(int fd, void* data, ssize_t size) {
388 ssize_t bytes = read(fd, data, size);
391 return safe_read(fd, data, size);
393 fatal_error("error reading fd", errno);
397 return (bytes == size);
400 void* stdin_loop(void* arg) {
402 unsigned char buf[4096];
403 bool loop_running = true;
407 sigdelset(&mask, SIGUSR2);
408 sigdelset(&mask, SIGTTIN);
409 sigdelset(&mask, SIGTERM);
410 sigdelset(&mask, SIGQUIT);
411 pthread_sigmask(SIG_SETMASK, &mask, NULL);
414 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &unused);
415 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &unused);
417 while (loop_running) {
418 if (!safe_read(control_read, buf, 1))
422 fatal_error("stdin_loop: bad data on control fd", buf[0]);
425 // If we fep, the parent thread will grab stdin_mutex and send us
426 // SIGUSR2 to interrupt the read() call.
427 pthread_mutex_lock(&stdin_mutex);
428 pthread_mutex_unlock(&stdin_mutex);
429 ssize_t bytes = read(0, buf, sizeof(buf));
434 loop_running = false;
437 } else if (bytes >= 0) {
438 safe_write(size_write, &bytes, sizeof(bytes));
440 if (!check_write(stdin_write, buf, bytes))
441 loop_running = false;
447 safe_close(stdin_write);
448 safe_close(control_read);
453 void open_console() {
454 FACTOR_ASSERT(!stdin_thread_initialized_p);
455 safe_pipe(&control_read, &control_write);
456 safe_pipe(&size_read, &size_write);
457 safe_pipe(&stdin_read, &stdin_write);
458 stdin_thread = start_thread(stdin_loop, NULL);
459 stdin_thread_initialized_p = true;
460 pthread_mutex_init(&stdin_mutex, NULL);
463 // This method is used to kill the stdin_loop before exiting from factor.
464 // An Nvidia driver bug on Linux is the reason this has to be done, see:
465 // http://www.nvnews.net/vbulletin/showthread.php?t=164619
466 void close_console() {
467 if (stdin_thread_initialized_p) {
468 pthread_cancel(stdin_thread);
469 pthread_join(stdin_thread, 0);
473 void lock_console() {
474 FACTOR_ASSERT(stdin_thread_initialized_p);
475 // Lock the stdin_mutex and send the stdin_loop thread a signal to interrupt
476 // any read() it has in progress. When the stdin loop iterates again, it will
477 // try to lock the same mutex and wait until unlock_console() is called.
478 pthread_mutex_lock(&stdin_mutex);
479 pthread_kill(stdin_thread, SIGUSR2);
482 void unlock_console() {
483 FACTOR_ASSERT(stdin_thread_initialized_p);
484 pthread_mutex_unlock(&stdin_mutex);
487 void ignore_ctrl_c() {
490 ret = signal(SIGINT, SIG_DFL);
491 } while (ret == SIG_ERR && errno == EINTR);
494 void handle_ctrl_c() {
495 struct sigaction fep_sigaction;
496 init_sigaction_with_handler(&fep_sigaction, fep_signal_handler);
497 sigaction_safe(SIGINT, &fep_sigaction, NULL);
500 void factor_vm::primitive_disable_ctrl_break() {
501 stop_on_ctrl_break = false;
504 void factor_vm::primitive_enable_ctrl_break() {
505 stop_on_ctrl_break = true;
511 ret = signal(SIGABRT, SIG_DFL);
512 } while (ret == SIG_ERR && errno == EINTR);