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 char* array = (char*)mmap(NULL, alloc_size, prot,
90 MAP_ANON | MAP_PRIVATE, -1, 0);
92 if (array == (char*)-1)
93 fatal_error("Out of memory in mmap", alloc_size);
95 start = (cell)(array + pagesize);
98 set_border_locked(true);
101 void segment::set_border_locked(bool locked) {
102 int pagesize = getpagesize();
103 cell lo = start - pagesize;
104 if (!set_memory_locked(lo, pagesize, locked)) {
105 fatal_error("Cannot (un)protect low guard page", lo);
109 if (!set_memory_locked(hi, pagesize, locked)) {
110 fatal_error("Cannot (un)protect high guard page", hi);
114 segment::~segment() {
115 int pagesize = getpagesize();
116 int retval = munmap((void*)(start - pagesize), pagesize + size + pagesize);
118 fatal_error("Segment deallocation failed", 0);
121 void factor_vm::dispatch_signal(void* uap, void(handler)()) {
122 dispatch_signal_handler((cell*)&UAP_STACK_POINTER(uap),
123 (cell*)&UAP_PROGRAM_COUNTER(uap),
124 (cell)FUNCTION_CODE_POINTER(handler));
125 UAP_SET_TOC_POINTER(uap, (cell)FUNCTION_TOC_POINTER(handler));
128 void factor_vm::start_sampling_profiler_timer() {
129 struct itimerval timer;
130 memset((void*)&timer, 0, sizeof(struct itimerval));
131 timer.it_value.tv_usec = 1000000 / samples_per_second;
132 timer.it_interval.tv_usec = 1000000 / samples_per_second;
133 setitimer(ITIMER_REAL, &timer, NULL);
136 void factor_vm::end_sampling_profiler_timer() {
137 struct itimerval timer;
138 memset((void*)&timer, 0, sizeof(struct itimerval));
139 setitimer(ITIMER_REAL, &timer, NULL);
142 void memory_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
144 cell fault_addr = (cell)siginfo->si_addr;
145 cell fault_pc = (cell)UAP_PROGRAM_COUNTER(uap);
146 factor_vm* vm = current_vm();
147 vm->verify_memory_protection_error(fault_addr);
148 vm->signal_fault_addr = fault_addr;
149 vm->signal_fault_pc = fault_pc;
150 vm->dispatch_signal(uap, factor::memory_signal_handler_impl);
153 void synchronous_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
154 if (factor_vm::fatal_erroring_p)
157 factor_vm* vm = current_vm_p();
159 fatal_error("Foreign thread received signal", signal);
160 vm->signal_number = signal;
161 vm->dispatch_signal(uap, factor::synchronous_signal_handler_impl);
164 void safe_write_nonblock(int fd, void* data, ssize_t size);
166 static void enqueue_signal(factor_vm* vm, int signal) {
167 if (vm->signal_pipe_output != 0)
168 safe_write_nonblock(vm->signal_pipe_output, &signal, sizeof(int));
171 void enqueue_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
172 if (factor_vm::fatal_erroring_p)
175 factor_vm* vm = current_vm_p();
177 enqueue_signal(vm, signal);
180 void fep_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
181 if (factor_vm::fatal_erroring_p)
184 factor_vm* vm = current_vm_p();
186 vm->safepoint.enqueue_fep(vm);
187 enqueue_signal(vm, signal);
189 fatal_error("Foreign thread received signal", signal);
192 void sample_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
193 factor_vm* vm = current_vm_p();
194 bool foreign_thread = false;
196 foreign_thread = true;
197 vm = thread_vms.begin()->second;
199 if (atomic::load(&vm->sampling_profiler_p))
200 vm->safepoint.enqueue_samples(vm, 1, (cell)UAP_PROGRAM_COUNTER(uap),
202 else if (!foreign_thread)
203 enqueue_signal(vm, signal);
206 void ignore_signal_handler(int signal, siginfo_t* siginfo, void* uap) {}
208 void fpe_signal_handler(int signal, siginfo_t* siginfo, void* uap) {
209 factor_vm* vm = current_vm();
210 vm->signal_number = signal;
211 vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
212 uap_clear_fpu_status(uap);
215 uap, (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
216 ? factor::synchronous_signal_handler_impl
217 : factor::fp_signal_handler_impl);
220 static void sigaction_safe(int signum, const struct sigaction* act,
221 struct sigaction* oldact) {
224 ret = sigaction(signum, act, oldact);
225 } while (ret == -1 && errno == EINTR);
228 fatal_error("sigaction failed", errno);
231 static void init_sigaction_with_handler(struct sigaction* act,
232 void (*handler)(int, siginfo_t*,
234 memset(act, 0, sizeof(struct sigaction));
235 sigemptyset(&act->sa_mask);
236 act->sa_sigaction = handler;
237 act->sa_flags = SA_SIGINFO | SA_ONSTACK;
240 static void safe_pipe(int* in, int* out) {
243 if (pipe(filedes) < 0)
244 fatal_error("Error opening pipe", errno);
249 if (fcntl(*in, F_SETFD, FD_CLOEXEC) < 0)
250 fatal_error("Error with fcntl", errno);
252 if (fcntl(*out, F_SETFD, FD_CLOEXEC) < 0)
253 fatal_error("Error with fcntl", errno);
256 static void init_signal_pipe(factor_vm* vm) {
257 safe_pipe(&vm->signal_pipe_input, &vm->signal_pipe_output);
259 if (fcntl(vm->signal_pipe_output, F_SETFL, O_NONBLOCK) < 0)
260 fatal_error("Error with fcntl", errno);
262 vm->special_objects[OBJ_SIGNAL_PIPE] = tag_fixnum(vm->signal_pipe_input);
265 void factor_vm::unix_init_signals() {
266 init_signal_pipe(this);
268 signal_callstack_seg = new segment(callstack_size, false);
270 stack_t signal_callstack;
271 signal_callstack.ss_sp = (char*)signal_callstack_seg->start;
272 signal_callstack.ss_size = signal_callstack_seg->size;
273 signal_callstack.ss_flags = 0;
275 if (sigaltstack(&signal_callstack, (stack_t*)NULL) < 0)
276 fatal_error("sigaltstack() failed", 0);
279 struct sigaction memory_sigaction;
280 init_sigaction_with_handler(&memory_sigaction, memory_signal_handler);
281 sigaction_safe(SIGBUS, &memory_sigaction, NULL);
282 sigaction_safe(SIGSEGV, &memory_sigaction, NULL);
283 sigaction_safe(SIGTRAP, &memory_sigaction, NULL);
287 struct sigaction fpe_sigaction;
288 init_sigaction_with_handler(&fpe_sigaction, fpe_signal_handler);
289 sigaction_safe(SIGFPE, &fpe_sigaction, NULL);
293 struct sigaction synchronous_sigaction;
294 init_sigaction_with_handler(&synchronous_sigaction,
295 synchronous_signal_handler);
296 sigaction_safe(SIGILL, &synchronous_sigaction, NULL);
297 sigaction_safe(SIGABRT, &synchronous_sigaction, NULL);
301 struct sigaction enqueue_sigaction;
302 init_sigaction_with_handler(&enqueue_sigaction, enqueue_signal_handler);
303 sigaction_safe(SIGWINCH, &enqueue_sigaction, NULL);
304 sigaction_safe(SIGUSR1, &enqueue_sigaction, NULL);
305 sigaction_safe(SIGCONT, &enqueue_sigaction, NULL);
306 sigaction_safe(SIGURG, &enqueue_sigaction, NULL);
307 sigaction_safe(SIGIO, &enqueue_sigaction, NULL);
308 sigaction_safe(SIGPROF, &enqueue_sigaction, NULL);
309 sigaction_safe(SIGVTALRM, &enqueue_sigaction, NULL);
311 sigaction_safe(SIGINFO, &enqueue_sigaction, NULL);
318 struct sigaction sample_sigaction;
319 init_sigaction_with_handler(&sample_sigaction, sample_signal_handler);
320 sigaction_safe(SIGALRM, &sample_sigaction, NULL);
323 /* We don't use SA_IGN here because then the ignore action is inherited
324 by subprocesses, which we don't want. There is a unit test in
325 io.launcher.unix for this. */
327 struct sigaction ignore_sigaction;
328 init_sigaction_with_handler(&ignore_sigaction, ignore_signal_handler);
329 sigaction_safe(SIGPIPE, &ignore_sigaction, NULL);
330 /* We send SIGUSR2 to the stdin_loop thread to interrupt it on FEP */
331 sigaction_safe(SIGUSR2, &ignore_sigaction, NULL);
335 /* On Unix, shared fds such as stdin cannot be set to non-blocking mode
336 (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
337 so we kludge around this by spawning a thread, which waits on a control pipe
338 for a signal, upon receiving this signal it reads one block of data from
339 stdin and writes it to a data pipe. Upon completion, it writes a 4-byte
340 integer to the size pipe, indicating how much data was written to the data
343 The read end of the size pipe can be set to non-blocking. */
354 bool stdin_thread_initialized_p = false;
355 THREADHANDLE stdin_thread;
356 pthread_mutex_t stdin_mutex;
359 void safe_close(int fd) {
361 fatal_error("error closing fd", errno);
364 bool check_write(int fd, void* data, ssize_t size) {
365 if (write(fd, data, size) == size)
368 return check_write(fd, data, size);
372 void safe_write(int fd, void* data, ssize_t size) {
373 if (!check_write(fd, data, size))
374 fatal_error("error writing fd", errno);
377 void safe_write_nonblock(int fd, void* data, ssize_t size) {
378 if (!check_write(fd, data, size) && errno != EAGAIN)
379 fatal_error("error writing fd", errno);
382 bool safe_read(int fd, void* data, ssize_t size) {
383 ssize_t bytes = read(fd, data, size);
386 return safe_read(fd, data, size);
388 fatal_error("error reading fd", errno);
392 return (bytes == size);
395 void* stdin_loop(void* arg) {
396 unsigned char buf[4096];
397 bool loop_running = true;
401 sigdelset(&mask, SIGUSR2);
402 sigdelset(&mask, SIGTTIN);
403 sigdelset(&mask, SIGTERM);
404 sigdelset(&mask, SIGQUIT);
405 pthread_sigmask(SIG_SETMASK, &mask, NULL);
408 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &unused);
409 pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &unused);
411 while (loop_running) {
412 if (!safe_read(control_read, buf, 1))
416 fatal_error("stdin_loop: bad data on control fd", buf[0]);
419 /* If we fep, the parent thread will grab stdin_mutex and send us
420 SIGUSR2 to interrupt the read() call. */
421 pthread_mutex_lock(&stdin_mutex);
422 pthread_mutex_unlock(&stdin_mutex);
423 ssize_t bytes = read(0, buf, sizeof(buf));
428 loop_running = false;
431 } else if (bytes >= 0) {
432 safe_write(size_write, &bytes, sizeof(bytes));
434 if (!check_write(stdin_write, buf, bytes))
435 loop_running = false;
441 safe_close(stdin_write);
442 safe_close(control_read);
447 void open_console() {
448 FACTOR_ASSERT(!stdin_thread_initialized_p);
449 safe_pipe(&control_read, &control_write);
450 safe_pipe(&size_read, &size_write);
451 safe_pipe(&stdin_read, &stdin_write);
452 stdin_thread = start_thread(stdin_loop, NULL);
453 stdin_thread_initialized_p = true;
454 pthread_mutex_init(&stdin_mutex, NULL);
457 /* This method is used to kill the stdin_loop before exiting from factor.
458 A Nvidia driver bug on Linux is the reason this has to be done, see:
459 http://www.nvnews.net/vbulletin/showthread.php?t=164619 */
460 void close_console() {
461 if (stdin_thread_initialized_p) {
462 pthread_cancel(stdin_thread);
463 pthread_join(stdin_thread, 0);
467 void lock_console() {
468 FACTOR_ASSERT(stdin_thread_initialized_p);
469 /* Lock the stdin_mutex and send the stdin_loop thread a signal to interrupt
470 any read() it has in progress. When the stdin loop iterates again, it will
471 try to lock the same mutex and wait until unlock_console() is called. */
472 pthread_mutex_lock(&stdin_mutex);
473 pthread_kill(stdin_thread, SIGUSR2);
476 void unlock_console() {
477 FACTOR_ASSERT(stdin_thread_initialized_p);
478 pthread_mutex_unlock(&stdin_mutex);
481 void ignore_ctrl_c() {
484 ret = signal(SIGINT, SIG_DFL);
485 } while (ret == SIG_ERR && errno == EINTR);
488 void handle_ctrl_c() {
489 struct sigaction fep_sigaction;
490 init_sigaction_with_handler(&fep_sigaction, fep_signal_handler);
491 sigaction_safe(SIGINT, &fep_sigaction, NULL);
497 ret = signal(SIGABRT, SIG_DFL);
498 } while (ret == SIG_ERR && errno == EINTR);