6 void start_thread(void *(*start_routine)(void *))
11 if (pthread_attr_init (&attr) != 0)
12 fatal_error("pthread_attr_init() failed",0);
13 if (pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED) != 0)
14 fatal_error("pthread_attr_setdetachstate() failed",0);
15 if (pthread_create (&thread, &attr, start_routine, NULL) != 0)
16 fatal_error("pthread_create() failed",0);
17 pthread_attr_destroy (&attr);
20 static void *null_dll;
25 gettimeofday(&t,NULL);
26 return (s64)t.tv_sec * 1000000 + t.tv_usec;
29 void sleep_micros(cell usec)
36 /* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
37 null_dll = dlopen(NULL_DLL,RTLD_LAZY);
40 void ffi_dlopen(dll *dll)
42 dll->dll = dlopen(alien_offset(dll->path,vm), RTLD_LAZY);
45 void *ffi_dlsym(dll *dll, symbol_char *symbol)
47 void *handle = (dll == NULL ? null_dll : dll->dll);
48 return dlsym(handle,symbol);
51 void ffi_dlclose(dll *dll)
54 general_error(ERROR_FFI,F,F,NULL);
61 char *path = (char *)(vm->untag_check<byte_array>(dpop()) + 1);
62 box_boolean(stat(path,&sb) >= 0);
65 segment *alloc_segment(cell size)
67 int pagesize = getpagesize();
69 char *array = (char *)mmap(NULL,pagesize + size + pagesize,
70 PROT_READ | PROT_WRITE | PROT_EXEC,
71 MAP_ANON | MAP_PRIVATE,-1,0);
73 if(array == (char*)-1)
76 if(mprotect(array,pagesize,PROT_NONE) == -1)
77 fatal_error("Cannot protect low guard page",(cell)array);
79 if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
80 fatal_error("Cannot protect high guard page",(cell)array);
82 segment *retval = (segment *)vm->safe_malloc(sizeof(segment));
84 retval->start = (cell)(array + pagesize);
86 retval->end = retval->start + size;
91 void dealloc_segment(segment *block)
93 int pagesize = getpagesize();
95 int retval = munmap((void*)(block->start - pagesize),
96 pagesize + block->size + pagesize);
99 fatal_error("dealloc_segment failed",0);
104 static stack_frame *uap_stack_pointer(void *uap)
106 /* There is a race condition here, but in practice a signal
107 delivered during stack frame setup/teardown or while transitioning
108 from Factor to C is a sign of things seriously gone wrong, not just
109 a divide by zero or stack underflow in the listener */
110 if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
112 stack_frame *ptr = (stack_frame *)ucontext_stack_pointer(uap);
114 critical_error("Invalid uap",(cell)uap);
121 void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
123 signal_fault_addr = (cell)siginfo->si_addr;
124 signal_callstack_top = uap_stack_pointer(uap);
125 UAP_PROGRAM_COUNTER(uap) = (cell)memory_signal_handler_impl;
128 void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
130 signal_number = signal;
131 signal_callstack_top = uap_stack_pointer(uap);
132 UAP_PROGRAM_COUNTER(uap) = (cell)misc_signal_handler_impl;
135 void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
137 signal_number = signal;
138 signal_callstack_top = uap_stack_pointer(uap);
139 signal_fpu_status = fpu_status(uap_fpu_status(uap));
140 uap_clear_fpu_status(uap);
141 UAP_PROGRAM_COUNTER(uap) =
142 (siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
143 ? (cell)misc_signal_handler_impl
144 : (cell)fp_signal_handler_impl;
147 static void sigaction_safe(int signum, const struct sigaction *act, struct sigaction *oldact)
152 ret = sigaction(signum, act, oldact);
154 while(ret == -1 && errno == EINTR);
157 fatal_error("sigaction failed", 0);
160 void unix_init_signals()
162 struct sigaction memory_sigaction;
163 struct sigaction misc_sigaction;
164 struct sigaction fpe_sigaction;
165 struct sigaction ignore_sigaction;
167 memset(&memory_sigaction,0,sizeof(struct sigaction));
168 sigemptyset(&memory_sigaction.sa_mask);
169 memory_sigaction.sa_sigaction = memory_signal_handler;
170 memory_sigaction.sa_flags = SA_SIGINFO;
172 sigaction_safe(SIGBUS,&memory_sigaction,NULL);
173 sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
175 memset(&fpe_sigaction,0,sizeof(struct sigaction));
176 sigemptyset(&fpe_sigaction.sa_mask);
177 fpe_sigaction.sa_sigaction = fpe_signal_handler;
178 fpe_sigaction.sa_flags = SA_SIGINFO;
180 sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
182 memset(&misc_sigaction,0,sizeof(struct sigaction));
183 sigemptyset(&misc_sigaction.sa_mask);
184 misc_sigaction.sa_sigaction = misc_signal_handler;
185 misc_sigaction.sa_flags = SA_SIGINFO;
187 sigaction_safe(SIGABRT,&misc_sigaction,NULL);
188 sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
189 sigaction_safe(SIGILL,&misc_sigaction,NULL);
191 memset(&ignore_sigaction,0,sizeof(struct sigaction));
192 sigemptyset(&ignore_sigaction.sa_mask);
193 ignore_sigaction.sa_handler = SIG_IGN;
194 sigaction_safe(SIGPIPE,&ignore_sigaction,NULL);
197 /* On Unix, shared fds such as stdin cannot be set to non-blocking mode
198 (http://homepages.tesco.net/J.deBoynePollard/FGA/dont-set-shared-file-descriptors-to-non-blocking-mode.html)
199 so we kludge around this by spawning a thread, which waits on a control pipe
200 for a signal, upon receiving this signal it reads one block of data from stdin
201 and writes it to a data pipe. Upon completion, it writes a 4-byte integer to
202 the size pipe, indicating how much data was written to the data pipe.
204 The read end of the size pipe can be set to non-blocking. */
216 void safe_close(int fd)
219 fatal_error("error closing fd",errno);
222 bool check_write(int fd, void *data, ssize_t size)
224 if(write(fd,data,size) == size)
229 return check_write(fd,data,size);
235 void safe_write(int fd, void *data, ssize_t size)
237 if(!check_write(fd,data,size))
238 fatal_error("error writing fd",errno);
241 bool safe_read(int fd, void *data, ssize_t size)
243 ssize_t bytes = read(fd,data,size);
247 return safe_read(fd,data,size);
250 fatal_error("error reading fd",errno);
255 return (bytes == size);
258 void *stdin_loop(void *arg)
260 unsigned char buf[4096];
261 bool loop_running = true;
265 if(!safe_read(control_read,buf,1))
269 fatal_error("stdin_loop: bad data on control fd",buf[0]);
273 ssize_t bytes = read(0,buf,sizeof(buf));
280 loop_running = false;
286 safe_write(size_write,&bytes,sizeof(bytes));
288 if(!check_write(stdin_write,buf,bytes))
289 loop_running = false;
295 safe_close(stdin_write);
296 safe_close(control_read);
305 if(pipe(filedes) < 0)
306 fatal_error("Error opening control pipe",errno);
308 control_read = filedes[0];
309 control_write = filedes[1];
311 if(pipe(filedes) < 0)
312 fatal_error("Error opening size pipe",errno);
314 size_read = filedes[0];
315 size_write = filedes[1];
317 if(pipe(filedes) < 0)
318 fatal_error("Error opening stdin pipe",errno);
320 stdin_read = filedes[0];
321 stdin_write = filedes[1];
323 start_thread(stdin_loop);
326 VM_C_API void wait_for_stdin()
328 if(write(control_write,"X",1) != 1)
333 fatal_error("Error writing control fd",errno);