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 unsigned long thread_id(){
21 return pthread_self();
25 static void *null_dll;
30 gettimeofday(&t,NULL);
31 return (s64)t.tv_sec * 1000000 + t.tv_usec;
34 void sleep_micros(cell usec)
39 void factorvm::init_ffi()
41 /* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
42 null_dll = dlopen(NULL_DLL,RTLD_LAZY);
45 void factorvm::ffi_dlopen(dll *dll)
47 dll->dll = dlopen(alien_offset(dll->path), RTLD_LAZY);
50 void *factorvm::ffi_dlsym(dll *dll, symbol_char *symbol)
52 void *handle = (dll == NULL ? null_dll : dll->dll);
53 return dlsym(handle,symbol);
56 void factorvm::ffi_dlclose(dll *dll)
59 general_error(ERROR_FFI,F,F,NULL);
66 inline void factorvm::vmprim_existsp()
69 char *path = (char *)(untag_check<byte_array>(dpop()) + 1);
70 box_boolean(stat(path,&sb) >= 0);
75 PRIMITIVE_GETVM()->vmprim_existsp();
78 segment *factorvm::alloc_segment(cell size)
80 int pagesize = getpagesize();
82 char *array = (char *)mmap(NULL,pagesize + size + pagesize,
83 PROT_READ | PROT_WRITE | PROT_EXEC,
84 MAP_ANON | MAP_PRIVATE,-1,0);
86 if(array == (char*)-1)
89 if(mprotect(array,pagesize,PROT_NONE) == -1)
90 fatal_error("Cannot protect low guard page",(cell)array);
92 if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
93 fatal_error("Cannot protect high guard page",(cell)array);
95 segment *retval = (segment *)safe_malloc(sizeof(segment));
97 retval->start = (cell)(array + pagesize);
99 retval->end = retval->start + size;
104 void dealloc_segment(segment *block)
106 int pagesize = getpagesize();
108 int retval = munmap((void*)(block->start - pagesize),
109 pagesize + block->size + pagesize);
112 fatal_error("dealloc_segment failed",0);
117 stack_frame *factorvm::uap_stack_pointer(void *uap)
119 /* There is a race condition here, but in practice a signal
120 delivered during stack frame setup/teardown or while transitioning
121 from Factor to C is a sign of things seriously gone wrong, not just
122 a divide by zero or stack underflow in the listener */
123 if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
125 stack_frame *ptr = (stack_frame *)ucontext_stack_pointer(uap);
127 critical_error("Invalid uap",(cell)uap);
134 void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
136 factorvm *myvm = lookup_vm(thread_id());
137 myvm->signal_fault_addr = (cell)siginfo->si_addr;
138 myvm->signal_callstack_top = myvm->uap_stack_pointer(uap);
139 UAP_PROGRAM_COUNTER(uap) = (cell)memory_signal_handler_impl;
142 void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
144 factorvm *myvm = lookup_vm(thread_id());
145 myvm->signal_number = signal;
146 myvm->signal_callstack_top = myvm->uap_stack_pointer(uap);
147 UAP_PROGRAM_COUNTER(uap) = (cell)misc_signal_handler_impl;
150 void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
152 signal_number = signal;
153 signal_callstack_top = uap_stack_pointer(uap);
154 signal_fpu_status = fpu_status(uap_fpu_status(uap));
155 uap_clear_fpu_status(uap);
156 UAP_PROGRAM_COUNTER(uap) =
157 (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
158 ? (cell)misc_signal_handler_impl
159 : (cell)fp_signal_handler_impl;
162 static void sigaction_safe(int signum, const struct sigaction *act, struct sigaction *oldact)
167 ret = sigaction(signum, act, oldact);
169 while(ret == -1 && errno == EINTR);
172 fatal_error("sigaction failed", 0);
175 void unix_init_signals()
177 struct sigaction memory_sigaction;
178 struct sigaction misc_sigaction;
179 struct sigaction fpe_sigaction;
180 struct sigaction ignore_sigaction;
182 memset(&memory_sigaction,0,sizeof(struct sigaction));
183 sigemptyset(&memory_sigaction.sa_mask);
184 memory_sigaction.sa_sigaction = memory_signal_handler;
185 memory_sigaction.sa_flags = SA_SIGINFO;
187 sigaction_safe(SIGBUS,&memory_sigaction,NULL);
188 sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
190 memset(&fpe_sigaction,0,sizeof(struct sigaction));
191 sigemptyset(&fpe_sigaction.sa_mask);
192 fpe_sigaction.sa_sigaction = fpe_signal_handler;
193 fpe_sigaction.sa_flags = SA_SIGINFO;
195 sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
197 memset(&misc_sigaction,0,sizeof(struct sigaction));
198 sigemptyset(&misc_sigaction.sa_mask);
199 misc_sigaction.sa_sigaction = misc_signal_handler;
200 misc_sigaction.sa_flags = SA_SIGINFO;
202 sigaction_safe(SIGABRT,&misc_sigaction,NULL);
203 sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
204 sigaction_safe(SIGILL,&misc_sigaction,NULL);
206 memset(&ignore_sigaction,0,sizeof(struct sigaction));
207 sigemptyset(&ignore_sigaction.sa_mask);
208 ignore_sigaction.sa_handler = SIG_IGN;
209 sigaction_safe(SIGPIPE,&ignore_sigaction,NULL);
212 /* On Unix, shared fds such as stdin cannot be set to non-blocking mode
213 (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
214 so we kludge around this by spawning a thread, which waits on a control pipe
215 for a signal, upon receiving this signal it reads one block of data from stdin
216 and writes it to a data pipe. Upon completion, it writes a 4-byte integer to
217 the size pipe, indicating how much data was written to the data pipe.
219 The read end of the size pipe can be set to non-blocking. */
231 void safe_close(int fd)
234 fatal_error("error closing fd",errno);
237 bool check_write(int fd, void *data, ssize_t size)
239 if(write(fd,data,size) == size)
244 return check_write(fd,data,size);
250 void safe_write(int fd, void *data, ssize_t size)
252 if(!check_write(fd,data,size))
253 fatal_error("error writing fd",errno);
256 bool safe_read(int fd, void *data, ssize_t size)
258 ssize_t bytes = read(fd,data,size);
262 return safe_read(fd,data,size);
265 fatal_error("error reading fd",errno);
270 return (bytes == size);
273 void *stdin_loop(void *arg)
275 unsigned char buf[4096];
276 bool loop_running = true;
280 if(!safe_read(control_read,buf,1))
284 fatal_error("stdin_loop: bad data on control fd",buf[0]);
288 ssize_t bytes = read(0,buf,sizeof(buf));
295 loop_running = false;
301 safe_write(size_write,&bytes,sizeof(bytes));
303 if(!check_write(stdin_write,buf,bytes))
304 loop_running = false;
310 safe_close(stdin_write);
311 safe_close(control_read);
320 if(pipe(filedes) < 0)
321 fatal_error("Error opening control pipe",errno);
323 control_read = filedes[0];
324 control_write = filedes[1];
326 if(pipe(filedes) < 0)
327 fatal_error("Error opening size pipe",errno);
329 size_read = filedes[0];
330 size_write = filedes[1];
332 if(pipe(filedes) < 0)
333 fatal_error("Error opening stdin pipe",errno);
335 stdin_read = filedes[0];
336 stdin_write = filedes[1];
338 start_thread(stdin_loop,NULL);
341 VM_C_API void wait_for_stdin()
343 if(write(control_write,"X",1) != 1)
348 fatal_error("Error writing control fd",errno);