6 THREADHANDLE start_thread(void *(*start_routine)(void *),void *args)
10 if (pthread_attr_init (&attr) != 0)
11 fatal_error("pthread_attr_init() failed",0);
12 if (pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_JOINABLE) != 0)
13 fatal_error("pthread_attr_setdetachstate() failed",0);
14 if (pthread_create (&thread, &attr, start_routine, args) != 0)
15 fatal_error("pthread_create() failed",0);
16 pthread_attr_destroy (&attr);
20 pthread_key_t tlsKey = 0;
22 void init_platform_globals()
24 if (pthread_key_create(&tlsKey, NULL) != 0)
25 fatal_error("pthread_key_create() failed",0);
29 void register_vm_with_thread(factor_vm *vm)
31 pthread_setspecific(tlsKey,vm);
36 factor_vm *vm = (factor_vm*)pthread_getspecific(tlsKey);
41 static void *null_dll;
46 gettimeofday(&t,NULL);
47 return (u64)t.tv_sec * 1000000 + t.tv_usec;
50 void sleep_nanos(u64 nsec)
55 ts.tv_sec = nsec / 1000000000;
56 ts.tv_nsec = nsec % 1000000000;
57 ret = nanosleep(&ts,&ts_rem);
58 while(ret == -1 && errno == EINTR)
60 memcpy(&ts, &ts_rem, sizeof(ts));
61 ret = nanosleep(&ts, &ts_rem);
65 fatal_error("nanosleep failed", 0);
68 void factor_vm::init_ffi()
70 /* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
71 null_dll = dlopen(NULL_DLL,RTLD_LAZY);
74 void factor_vm::ffi_dlopen(dll *dll)
76 dll->handle = dlopen(alien_offset(dll->path), RTLD_LAZY);
79 void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
81 void *handle = (dll == NULL ? null_dll : dll->handle);
82 return dlsym(handle,symbol);
85 void factor_vm::ffi_dlclose(dll *dll)
87 if(dlclose(dll->handle))
88 general_error(ERROR_FFI,false_object,false_object,NULL);
92 void factor_vm::primitive_existsp()
95 char *path = (char *)(untag_check<byte_array>(ctx->pop()) + 1);
96 ctx->push(tag_boolean(stat(path,&sb) >= 0));
99 segment::segment(cell size_, bool executable_p)
103 int pagesize = getpagesize();
107 prot = (PROT_READ | PROT_WRITE | PROT_EXEC);
109 prot = (PROT_READ | PROT_WRITE);
111 char *array = (char *)mmap(NULL,pagesize + size + pagesize,prot,MAP_ANON | MAP_PRIVATE,-1,0);
112 if(array == (char*)-1) out_of_memory();
114 if(mprotect(array,pagesize,PROT_NONE) == -1)
115 fatal_error("Cannot protect low guard page",(cell)array);
117 if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
118 fatal_error("Cannot protect high guard page",(cell)array);
120 start = (cell)(array + pagesize);
126 int pagesize = getpagesize();
127 int retval = munmap((void*)(start - pagesize),pagesize + size + pagesize);
129 fatal_error("Segment deallocation failed",0);
132 void factor_vm::dispatch_signal(void *uap, void (handler)())
134 if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
136 stack_frame *ptr = (stack_frame *)UAP_STACK_POINTER(uap);
138 signal_callstack_top = ptr;
141 signal_callstack_top = NULL;
143 UAP_STACK_POINTER(uap) = align_stack_pointer(UAP_STACK_POINTER(uap));
144 UAP_PROGRAM_COUNTER(uap) = (cell)handler;
147 void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
149 factor_vm *vm = tls_vm();
150 vm->signal_fault_addr = (cell)siginfo->si_addr;
151 vm->dispatch_signal(uap,factor::memory_signal_handler_impl);
154 void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
156 factor_vm *vm = tls_vm();
157 vm->signal_number = signal;
158 vm->dispatch_signal(uap,factor::misc_signal_handler_impl);
161 void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
163 factor_vm *vm = tls_vm();
164 vm->signal_number = signal;
165 vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
166 uap_clear_fpu_status(uap);
168 vm->dispatch_signal(uap,
169 (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
170 ? factor::misc_signal_handler_impl
171 : factor::fp_signal_handler_impl);
174 static void sigaction_safe(int signum, const struct sigaction *act, struct sigaction *oldact)
179 ret = sigaction(signum, act, oldact);
181 while(ret == -1 && errno == EINTR);
184 fatal_error("sigaction failed", 0);
187 void unix_init_signals()
189 struct sigaction memory_sigaction;
190 struct sigaction misc_sigaction;
191 struct sigaction fpe_sigaction;
192 struct sigaction ignore_sigaction;
194 memset(&memory_sigaction,0,sizeof(struct sigaction));
195 sigemptyset(&memory_sigaction.sa_mask);
196 memory_sigaction.sa_sigaction = memory_signal_handler;
197 memory_sigaction.sa_flags = SA_SIGINFO;
199 sigaction_safe(SIGBUS,&memory_sigaction,NULL);
200 sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
202 memset(&fpe_sigaction,0,sizeof(struct sigaction));
203 sigemptyset(&fpe_sigaction.sa_mask);
204 fpe_sigaction.sa_sigaction = fpe_signal_handler;
205 fpe_sigaction.sa_flags = SA_SIGINFO;
207 sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
209 memset(&misc_sigaction,0,sizeof(struct sigaction));
210 sigemptyset(&misc_sigaction.sa_mask);
211 misc_sigaction.sa_sigaction = misc_signal_handler;
212 misc_sigaction.sa_flags = SA_SIGINFO;
214 sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
215 sigaction_safe(SIGILL,&misc_sigaction,NULL);
217 memset(&ignore_sigaction,0,sizeof(struct sigaction));
218 sigemptyset(&ignore_sigaction.sa_mask);
219 ignore_sigaction.sa_handler = SIG_IGN;
220 sigaction_safe(SIGPIPE,&ignore_sigaction,NULL);
223 /* On Unix, shared fds such as stdin cannot be set to non-blocking mode
224 (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
225 so we kludge around this by spawning a thread, which waits on a control pipe
226 for a signal, upon receiving this signal it reads one block of data from stdin
227 and writes it to a data pipe. Upon completion, it writes a 4-byte integer to
228 the size pipe, indicating how much data was written to the data pipe.
230 The read end of the size pipe can be set to non-blocking. */
242 void safe_close(int fd)
245 fatal_error("error closing fd",errno);
248 bool check_write(int fd, void *data, ssize_t size)
250 if(write(fd,data,size) == size)
255 return check_write(fd,data,size);
261 void safe_write(int fd, void *data, ssize_t size)
263 if(!check_write(fd,data,size))
264 fatal_error("error writing fd",errno);
267 bool safe_read(int fd, void *data, ssize_t size)
269 ssize_t bytes = read(fd,data,size);
273 return safe_read(fd,data,size);
276 fatal_error("error reading fd",errno);
281 return (bytes == size);
284 void *stdin_loop(void *arg)
286 unsigned char buf[4096];
287 bool loop_running = true;
291 if(!safe_read(control_read,buf,1))
295 fatal_error("stdin_loop: bad data on control fd",buf[0]);
299 ssize_t bytes = read(0,buf,sizeof(buf));
306 loop_running = false;
312 safe_write(size_write,&bytes,sizeof(bytes));
314 if(!check_write(stdin_write,buf,bytes))
315 loop_running = false;
321 safe_close(stdin_write);
322 safe_close(control_read);
331 if(pipe(filedes) < 0)
332 fatal_error("Error opening control pipe",errno);
334 control_read = filedes[0];
335 control_write = filedes[1];
337 if(pipe(filedes) < 0)
338 fatal_error("Error opening size pipe",errno);
340 size_read = filedes[0];
341 size_write = filedes[1];
343 if(pipe(filedes) < 0)
344 fatal_error("Error opening stdin pipe",errno);
346 stdin_read = filedes[0];
347 stdin_write = filedes[1];
349 start_thread(stdin_loop,NULL);
352 VM_C_API void wait_for_stdin()
354 if(write(control_write,"X",1) != 1)
359 fatal_error("Error writing control fd",errno);