#include "master.hpp" namespace factor { bool set_memory_locked(cell base, cell size, bool locked) { int prot = locked ? PROT_NONE : PROT_READ | PROT_WRITE; int status = mprotect((char*)base, size, prot); return status != -1; } THREADHANDLE start_thread(void* (*start_routine)(void*), void* args) { pthread_attr_t attr; pthread_t thread; if (pthread_attr_init(&attr) != 0) fatal_error("pthread_attr_init() failed", 0); if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) != 0) fatal_error("pthread_attr_setdetachstate() failed", 0); if (pthread_create(&thread, &attr, start_routine, args) != 0) fatal_error("pthread_create() failed", 0); pthread_attr_destroy(&attr); return thread; } static void* null_dll; void sleep_nanos(uint64_t nsec) { timespec ts; timespec ts_rem; int ret; ts.tv_sec = nsec / 1000000000; ts.tv_nsec = nsec % 1000000000; ret = nanosleep(&ts, &ts_rem); while (ret == -1 && errno == EINTR) { memcpy(&ts, &ts_rem, sizeof(ts)); ret = nanosleep(&ts, &ts_rem); } if (ret == -1) fatal_error("nanosleep failed", 0); } void factor_vm::init_ffi() { null_dll = dlopen(NULL, RTLD_LAZY); } void factor_vm::ffi_dlopen(dll* dll) { dll->handle = dlopen(alien_offset(dll->path), RTLD_LAZY | RTLD_GLOBAL); } cell factor_vm::ffi_dlsym_raw(dll* dll, symbol_char* symbol) { return (cell)dlsym(dll ? dll->handle : null_dll, symbol); } cell factor_vm::ffi_dlsym(dll* dll, symbol_char* symbol) { return FUNCTION_CODE_POINTER(ffi_dlsym_raw(dll, symbol)); } void factor_vm::ffi_dlclose(dll* dll) { if (dlclose(dll->handle)) general_error(ERROR_FFI, false_object, false_object); dll->handle = NULL; } void factor_vm::primitive_existsp() { struct stat sb; char* path = (char*)(untag_check(ctx->pop()) + 1); ctx->push(tag_boolean(stat(path, &sb) >= 0)); } bool move_file(const vm_char* path1, const vm_char* path2) { int ret = 0; do { ret = rename((path1), (path2)); } while (ret < 0 && errno == EINTR); return ret == 0; } segment::segment(cell size_, bool executable_p) { size = size_; int pagesize = getpagesize(); int prot; if (executable_p) prot = PROT_READ | PROT_WRITE | PROT_EXEC; else prot = PROT_READ | PROT_WRITE; cell alloc_size = 2 * pagesize + size; char* array = (char*)mmap(NULL, alloc_size, prot, MAP_ANON | MAP_PRIVATE, -1, 0); if (array == (char*)-1) fatal_error("Out of memory in mmap", alloc_size); start = (cell)(array + pagesize); end = start + size; set_border_locked(true); } segment::~segment() { int pagesize = getpagesize(); int retval = munmap((void*)(start - pagesize), 2 * pagesize + size); if (retval) fatal_error("Segment deallocation failed", 0); } void factor_vm::start_sampling_profiler_timer() { struct itimerval timer; memset((void*)&timer, 0, sizeof(struct itimerval)); timer.it_value.tv_usec = 1000000 / samples_per_second; timer.it_interval.tv_usec = 1000000 / samples_per_second; setitimer(ITIMER_REAL, &timer, NULL); } void factor_vm::end_sampling_profiler_timer() { struct itimerval timer; memset((void*)&timer, 0, sizeof(struct itimerval)); setitimer(ITIMER_REAL, &timer, NULL); } void factor_vm::dispatch_signal(void* uap, void(handler)()) { dispatch_signal_handler((cell*)&UAP_STACK_POINTER(uap), (cell*)&UAP_PROGRAM_COUNTER(uap), (cell)FUNCTION_CODE_POINTER(handler)); } void memory_signal_handler(int signal, siginfo_t* siginfo, void* uap) { cell fault_addr = (cell)siginfo->si_addr; cell fault_pc = (cell)UAP_PROGRAM_COUNTER(uap); factor_vm* vm = current_vm(); vm->set_memory_protection_error(fault_addr, fault_pc); vm->dispatch_signal(uap, factor::memory_signal_handler_impl); } void synchronous_signal_handler(int signal, siginfo_t* siginfo, void* uap) { if (factor_vm::fatal_erroring_p) return; factor_vm* vm = current_vm_p(); if (!vm) fatal_error("Foreign thread received signal", signal); vm->signal_number = signal; vm->dispatch_signal(uap, factor::synchronous_signal_handler_impl); } void safe_write_nonblock(int fd, void* data, ssize_t size); static void enqueue_signal(factor_vm* vm, int signal) { if (vm->signal_pipe_output != 0) safe_write_nonblock(vm->signal_pipe_output, &signal, sizeof(int)); } void enqueue_signal_handler(int signal, siginfo_t* siginfo, void* uap) { if (factor_vm::fatal_erroring_p) return; factor_vm* vm = current_vm_p(); if (vm) enqueue_signal(vm, signal); } void fep_signal_handler(int signal, siginfo_t* siginfo, void* uap) { if (factor_vm::fatal_erroring_p) return; factor_vm* vm = current_vm_p(); if (vm) { vm->enqueue_fep(); enqueue_signal(vm, signal); } else fatal_error("Foreign thread received signal", signal); } void sample_signal_handler(int signal, siginfo_t* siginfo, void* uap) { factor_vm* vm = current_vm_p(); bool foreign_thread = false; if (vm == NULL) { foreign_thread = true; vm = thread_vms.begin()->second; } if (atomic::load(&vm->sampling_profiler_p)) vm->enqueue_samples(1, (cell)UAP_PROGRAM_COUNTER(uap), foreign_thread); else if (!foreign_thread) enqueue_signal(vm, signal); } void ignore_signal_handler(int signal, siginfo_t* siginfo, void* uap) {} void fpe_signal_handler(int signal, siginfo_t* siginfo, void* uap) { factor_vm* vm = current_vm(); vm->signal_number = signal; vm->signal_fpu_status = fpu_status(uap_fpu_status(uap)); uap_clear_fpu_status(uap); vm->dispatch_signal( uap, (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF) ? factor::synchronous_signal_handler_impl : factor::fp_signal_handler_impl); } static void sigaction_safe(int signum, const struct sigaction* act, struct sigaction* oldact) { int ret; do { ret = sigaction(signum, act, oldact); } while (ret == -1 && errno == EINTR); if (ret == -1) fatal_error("sigaction failed", errno); } static void init_sigaction_with_handler(struct sigaction* act, void (*handler)(int, siginfo_t*, void*)) { memset(act, 0, sizeof(struct sigaction)); sigemptyset(&act->sa_mask); act->sa_sigaction = handler; act->sa_flags = SA_SIGINFO | SA_ONSTACK; } static void safe_pipe(int* in, int* out) { int filedes[2]; if (pipe(filedes) < 0) fatal_error("Error opening pipe", errno); *in = filedes[0]; *out = filedes[1]; if (fcntl(*in, F_SETFD, FD_CLOEXEC) < 0) fatal_error("Error with fcntl", errno); if (fcntl(*out, F_SETFD, FD_CLOEXEC) < 0) fatal_error("Error with fcntl", errno); } static void init_signal_pipe(factor_vm* vm) { safe_pipe(&vm->signal_pipe_input, &vm->signal_pipe_output); if (fcntl(vm->signal_pipe_output, F_SETFL, O_NONBLOCK) < 0) fatal_error("Error with fcntl", errno); vm->special_objects[OBJ_SIGNAL_PIPE] = tag_fixnum(vm->signal_pipe_input); } void factor_vm::unix_init_signals() { init_signal_pipe(this); signal_callstack_seg = new segment(callstack_size, false); stack_t signal_callstack; signal_callstack.ss_sp = (char*)signal_callstack_seg->start; signal_callstack.ss_size = signal_callstack_seg->size; signal_callstack.ss_flags = 0; if (sigaltstack(&signal_callstack, (stack_t*)NULL) < 0) fatal_error("sigaltstack() failed", 0); { struct sigaction memory_sigaction; init_sigaction_with_handler(&memory_sigaction, memory_signal_handler); sigaction_safe(SIGBUS, &memory_sigaction, NULL); sigaction_safe(SIGSEGV, &memory_sigaction, NULL); sigaction_safe(SIGTRAP, &memory_sigaction, NULL); } { struct sigaction fpe_sigaction; init_sigaction_with_handler(&fpe_sigaction, fpe_signal_handler); sigaction_safe(SIGFPE, &fpe_sigaction, NULL); } { struct sigaction synchronous_sigaction; init_sigaction_with_handler(&synchronous_sigaction, synchronous_signal_handler); sigaction_safe(SIGILL, &synchronous_sigaction, NULL); sigaction_safe(SIGABRT, &synchronous_sigaction, NULL); } { struct sigaction enqueue_sigaction; init_sigaction_with_handler(&enqueue_sigaction, enqueue_signal_handler); sigaction_safe(SIGWINCH, &enqueue_sigaction, NULL); sigaction_safe(SIGUSR1, &enqueue_sigaction, NULL); sigaction_safe(SIGCONT, &enqueue_sigaction, NULL); sigaction_safe(SIGURG, &enqueue_sigaction, NULL); sigaction_safe(SIGIO, &enqueue_sigaction, NULL); sigaction_safe(SIGPROF, &enqueue_sigaction, NULL); sigaction_safe(SIGVTALRM, &enqueue_sigaction, NULL); #ifdef SIGINFO sigaction_safe(SIGINFO, &enqueue_sigaction, NULL); #endif } handle_ctrl_c(); { struct sigaction sample_sigaction; init_sigaction_with_handler(&sample_sigaction, sample_signal_handler); sigaction_safe(SIGALRM, &sample_sigaction, NULL); } // We don't use SA_IGN here because then the ignore action is inherited // by subprocesses, which we don't want. There is a unit test in // io.launcher.unix for this. { struct sigaction ignore_sigaction; init_sigaction_with_handler(&ignore_sigaction, ignore_signal_handler); sigaction_safe(SIGPIPE, &ignore_sigaction, NULL); // We send SIGUSR2 to the stdin_loop thread to interrupt it on FEP sigaction_safe(SIGUSR2, &ignore_sigaction, NULL); } } // On Unix, shared fds such as stdin cannot be set to non-blocking mode // (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html) // so we kludge around this by spawning a thread, which waits on a control pipe // for a signal, upon receiving this signal it reads one block of data from // stdin and writes it to a data pipe. Upon completion, it writes a 4-byte // integer to the size pipe, indicating how much data was written to the data // pipe. // The read end of the size pipe can be set to non-blocking. extern "C" { int stdin_read; int stdin_write; int control_read; int control_write; int size_read; int size_write; bool stdin_thread_initialized_p = false; THREADHANDLE stdin_thread; pthread_mutex_t stdin_mutex; } void safe_close(int fd) { if (close(fd) < 0) fatal_error("error closing fd", errno); } bool check_write(int fd, void* data, ssize_t size) { if (write(fd, data, size) == size) return true; if (errno == EINTR) return check_write(fd, data, size); return false; } void safe_write(int fd, void* data, ssize_t size) { if (!check_write(fd, data, size)) fatal_error("error writing fd", errno); } void safe_write_nonblock(int fd, void* data, ssize_t size) { if (!check_write(fd, data, size) && errno != EAGAIN) fatal_error("error writing fd", errno); } bool safe_read(int fd, void* data, ssize_t size) { ssize_t bytes = read(fd, data, size); if (bytes < 0) { if (errno == EINTR) return safe_read(fd, data, size); else { fatal_error("error reading fd", errno); return false; } } else return (bytes == size); } void* stdin_loop(void* arg) { unsigned char buf[4096]; bool loop_running = true; sigset_t mask; sigfillset(&mask); sigdelset(&mask, SIGUSR2); sigdelset(&mask, SIGTTIN); sigdelset(&mask, SIGTERM); sigdelset(&mask, SIGQUIT); pthread_sigmask(SIG_SETMASK, &mask, NULL); int unused; pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &unused); pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &unused); while (loop_running) { if (!safe_read(control_read, buf, 1)) break; if (buf[0] != 'X') fatal_error("stdin_loop: bad data on control fd", buf[0]); for (;;) { // If we fep, the parent thread will grab stdin_mutex and send us // SIGUSR2 to interrupt the read() call. pthread_mutex_lock(&stdin_mutex); pthread_mutex_unlock(&stdin_mutex); ssize_t bytes = read(0, buf, sizeof(buf)); if (bytes < 0) { if (errno == EINTR) continue; else { loop_running = false; break; } } else if (bytes >= 0) { safe_write(size_write, &bytes, sizeof(bytes)); if (!check_write(stdin_write, buf, bytes)) loop_running = false; break; } } } safe_close(stdin_write); safe_close(control_read); return NULL; } void open_console() { FACTOR_ASSERT(!stdin_thread_initialized_p); safe_pipe(&control_read, &control_write); safe_pipe(&size_read, &size_write); safe_pipe(&stdin_read, &stdin_write); stdin_thread = start_thread(stdin_loop, NULL); stdin_thread_initialized_p = true; pthread_mutex_init(&stdin_mutex, NULL); } // This method is used to kill the stdin_loop before exiting from factor. // An Nvidia driver bug on Linux is the reason this has to be done, see: // http://www.nvnews.net/vbulletin/showthread.php?t=164619 void close_console() { if (stdin_thread_initialized_p) { pthread_cancel(stdin_thread); pthread_join(stdin_thread, 0); } } void lock_console() { FACTOR_ASSERT(stdin_thread_initialized_p); // Lock the stdin_mutex and send the stdin_loop thread a signal to interrupt // any read() it has in progress. When the stdin loop iterates again, it will // try to lock the same mutex and wait until unlock_console() is called. pthread_mutex_lock(&stdin_mutex); pthread_kill(stdin_thread, SIGUSR2); } void unlock_console() { FACTOR_ASSERT(stdin_thread_initialized_p); pthread_mutex_unlock(&stdin_mutex); } void ignore_ctrl_c() { sig_t ret; do { ret = signal(SIGINT, SIG_DFL); } while (ret == SIG_ERR && errno == EINTR); } void handle_ctrl_c() { struct sigaction fep_sigaction; init_sigaction_with_handler(&fep_sigaction, fep_signal_handler); sigaction_safe(SIGINT, &fep_sigaction, NULL); } void factor_vm::primitive_disable_ctrl_break() { stop_on_ctrl_break = false; } void factor_vm::primitive_enable_ctrl_break() { stop_on_ctrl_break = true; } void abort() { sig_t ret; do { ret = signal(SIGABRT, SIG_DFL); } while (ret == SIG_ERR && errno == EINTR); close_console(); ::abort(); } }