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);
21 pthread_key_t tlsKey = 0;
23 void init_platform_globals()
25 if (pthread_key_create(&tlsKey, NULL) != 0){
26 fatal_error("pthread_key_create() failed",0);
31 void register_vm_with_thread(factorvm *vm)
33 pthread_setspecific(tlsKey,vm);
38 return (factorvm*)pthread_getspecific(tlsKey);
41 static void *null_dll;
46 gettimeofday(&t,NULL);
47 return (s64)t.tv_sec * 1000000 + t.tv_usec;
50 void sleep_micros(cell usec)
55 void factorvm::init_ffi()
57 /* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
58 null_dll = dlopen(NULL_DLL,RTLD_LAZY);
61 void factorvm::ffi_dlopen(dll *dll)
63 dll->dll = dlopen(alien_offset(dll->path), RTLD_LAZY);
66 void *factorvm::ffi_dlsym(dll *dll, symbol_char *symbol)
68 void *handle = (dll == NULL ? null_dll : dll->dll);
69 return dlsym(handle,symbol);
72 void factorvm::ffi_dlclose(dll *dll)
75 general_error(ERROR_FFI,F,F,NULL);
82 inline void factorvm::vmprim_existsp()
85 char *path = (char *)(untag_check<byte_array>(dpop()) + 1);
86 box_boolean(stat(path,&sb) >= 0);
91 PRIMITIVE_GETVM()->vmprim_existsp();
94 segment *factorvm::alloc_segment(cell size)
96 int pagesize = getpagesize();
98 char *array = (char *)mmap(NULL,pagesize + size + pagesize,
99 PROT_READ | PROT_WRITE | PROT_EXEC,
100 MAP_ANON | MAP_PRIVATE,-1,0);
102 if(array == (char*)-1)
105 if(mprotect(array,pagesize,PROT_NONE) == -1)
106 fatal_error("Cannot protect low guard page",(cell)array);
108 if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
109 fatal_error("Cannot protect high guard page",(cell)array);
111 segment *retval = (segment *)safe_malloc(sizeof(segment));
113 retval->start = (cell)(array + pagesize);
115 retval->end = retval->start + size;
120 void dealloc_segment(segment *block)
122 int pagesize = getpagesize();
124 int retval = munmap((void*)(block->start - pagesize),
125 pagesize + block->size + pagesize);
128 fatal_error("dealloc_segment failed",0);
133 stack_frame *factorvm::uap_stack_pointer(void *uap)
135 /* There is a race condition here, but in practice a signal
136 delivered during stack frame setup/teardown or while transitioning
137 from Factor to C is a sign of things seriously gone wrong, not just
138 a divide by zero or stack underflow in the listener */
139 if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
141 stack_frame *ptr = (stack_frame *)ucontext_stack_pointer(uap);
143 critical_error("Invalid uap",(cell)uap);
150 void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
152 factorvm *myvm = SIGNAL_VM_PTR();
153 myvm->signal_fault_addr = (cell)siginfo->si_addr;
154 myvm->signal_callstack_top = myvm->uap_stack_pointer(uap);
155 UAP_PROGRAM_COUNTER(uap) = (cell)memory_signal_handler_impl;
158 void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
160 factorvm *myvm = SIGNAL_VM_PTR();
161 myvm->signal_number = signal;
162 myvm->signal_callstack_top = myvm->uap_stack_pointer(uap);
163 UAP_PROGRAM_COUNTER(uap) = (cell)misc_signal_handler_impl;
166 void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
168 signal_number = signal;
169 signal_callstack_top = uap_stack_pointer(uap);
170 signal_fpu_status = fpu_status(uap_fpu_status(uap));
171 uap_clear_fpu_status(uap);
172 UAP_PROGRAM_COUNTER(uap) =
173 (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
174 ? (cell)misc_signal_handler_impl
175 : (cell)fp_signal_handler_impl;
178 static void sigaction_safe(int signum, const struct sigaction *act, struct sigaction *oldact)
183 ret = sigaction(signum, act, oldact);
185 while(ret == -1 && errno == EINTR);
188 fatal_error("sigaction failed", 0);
191 void unix_init_signals()
193 struct sigaction memory_sigaction;
194 struct sigaction misc_sigaction;
195 struct sigaction fpe_sigaction;
196 struct sigaction ignore_sigaction;
198 memset(&memory_sigaction,0,sizeof(struct sigaction));
199 sigemptyset(&memory_sigaction.sa_mask);
200 memory_sigaction.sa_sigaction = memory_signal_handler;
201 memory_sigaction.sa_flags = SA_SIGINFO;
203 sigaction_safe(SIGBUS,&memory_sigaction,NULL);
204 sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
206 memset(&fpe_sigaction,0,sizeof(struct sigaction));
207 sigemptyset(&fpe_sigaction.sa_mask);
208 fpe_sigaction.sa_sigaction = fpe_signal_handler;
209 fpe_sigaction.sa_flags = SA_SIGINFO;
211 sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
213 memset(&misc_sigaction,0,sizeof(struct sigaction));
214 sigemptyset(&misc_sigaction.sa_mask);
215 misc_sigaction.sa_sigaction = misc_signal_handler;
216 misc_sigaction.sa_flags = SA_SIGINFO;
218 sigaction_safe(SIGABRT,&misc_sigaction,NULL);
219 sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
220 sigaction_safe(SIGILL,&misc_sigaction,NULL);
222 memset(&ignore_sigaction,0,sizeof(struct sigaction));
223 sigemptyset(&ignore_sigaction.sa_mask);
224 ignore_sigaction.sa_handler = SIG_IGN;
225 sigaction_safe(SIGPIPE,&ignore_sigaction,NULL);
228 /* On Unix, shared fds such as stdin cannot be set to non-blocking mode
229 (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
230 so we kludge around this by spawning a thread, which waits on a control pipe
231 for a signal, upon receiving this signal it reads one block of data from stdin
232 and writes it to a data pipe. Upon completion, it writes a 4-byte integer to
233 the size pipe, indicating how much data was written to the data pipe.
235 The read end of the size pipe can be set to non-blocking. */
247 void safe_close(int fd)
250 fatal_error("error closing fd",errno);
253 bool check_write(int fd, void *data, ssize_t size)
255 if(write(fd,data,size) == size)
260 return check_write(fd,data,size);
266 void safe_write(int fd, void *data, ssize_t size)
268 if(!check_write(fd,data,size))
269 fatal_error("error writing fd",errno);
272 bool safe_read(int fd, void *data, ssize_t size)
274 ssize_t bytes = read(fd,data,size);
278 return safe_read(fd,data,size);
281 fatal_error("error reading fd",errno);
286 return (bytes == size);
289 void *stdin_loop(void *arg)
291 unsigned char buf[4096];
292 bool loop_running = true;
296 if(!safe_read(control_read,buf,1))
300 fatal_error("stdin_loop: bad data on control fd",buf[0]);
304 ssize_t bytes = read(0,buf,sizeof(buf));
311 loop_running = false;
317 safe_write(size_write,&bytes,sizeof(bytes));
319 if(!check_write(stdin_write,buf,bytes))
320 loop_running = false;
326 safe_close(stdin_write);
327 safe_close(control_read);
336 if(pipe(filedes) < 0)
337 fatal_error("Error opening control pipe",errno);
339 control_read = filedes[0];
340 control_write = filedes[1];
342 if(pipe(filedes) < 0)
343 fatal_error("Error opening size pipe",errno);
345 size_read = filedes[0];
346 size_write = filedes[1];
348 if(pipe(filedes) < 0)
349 fatal_error("Error opening stdin pipe",errno);
351 stdin_read = filedes[0];
352 stdin_write = filedes[1];
354 start_thread(stdin_loop,NULL);
357 VM_C_API void wait_for_stdin()
359 if(write(control_write,"X",1) != 1)
364 fatal_error("Error writing control fd",errno);