factor/vm/os-unix.cpp

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#include "master.hpp"
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namespace factor
{
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void start_thread(void *(*start_routine)(void *))
{
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_DETACHED) != 0)
fatal_error("pthread_attr_setdetachstate() failed",0);
if (pthread_create (&thread, &attr, start_routine, NULL) != 0)
fatal_error("pthread_create() failed",0);
pthread_attr_destroy (&attr);
}
static void *null_dll;
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s64 current_micros()
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{
struct timeval t;
gettimeofday(&t,NULL);
return (s64)t.tv_sec * 1000000 + t.tv_usec;
}
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void sleep_micros(cell usec)
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{
usleep(usec);
}
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void init_ffi()
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{
/* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
null_dll = dlopen(NULL_DLL,RTLD_LAZY);
}
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void ffi_dlopen(dll *dll)
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{
dll->dll = dlopen(alien_offset(dll->path), RTLD_LAZY);
}
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void *ffi_dlsym(dll *dll, symbol_char *symbol)
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{
void *handle = (dll == NULL ? null_dll : dll->dll);
return dlsym(handle,symbol);
}
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void ffi_dlclose(dll *dll)
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{
if(dlclose(dll->dll))
general_error(ERROR_FFI,F,F,NULL);
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dll->dll = NULL;
}
PRIMITIVE(existsp)
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{
struct stat sb;
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char *path = (char *)(untag_check<byte_array>(dpop()) + 1);
box_boolean(stat(path,&sb) >= 0);
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}
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segment *alloc_segment(cell size)
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{
int pagesize = getpagesize();
char *array = (char *)mmap(NULL,pagesize + size + pagesize,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_ANON | MAP_PRIVATE,-1,0);
if(array == (char*)-1)
out_of_memory();
if(mprotect(array,pagesize,PROT_NONE) == -1)
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fatal_error("Cannot protect low guard page",(cell)array);
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if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
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fatal_error("Cannot protect high guard page",(cell)array);
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segment *retval = (segment *)safe_malloc(sizeof(segment));
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retval->start = (cell)(array + pagesize);
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retval->size = size;
retval->end = retval->start + size;
return retval;
}
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void dealloc_segment(segment *block)
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{
int pagesize = getpagesize();
int retval = munmap((void*)(block->start - pagesize),
pagesize + block->size + pagesize);
if(retval)
fatal_error("dealloc_segment failed",0);
free(block);
}
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static stack_frame *uap_stack_pointer(void *uap)
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{
/* There is a race condition here, but in practice a signal
delivered during stack frame setup/teardown or while transitioning
from Factor to C is a sign of things seriously gone wrong, not just
a divide by zero or stack underflow in the listener */
if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
{
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stack_frame *ptr = (stack_frame *)ucontext_stack_pointer(uap);
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if(!ptr)
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critical_error("Invalid uap",(cell)uap);
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return ptr;
}
else
return NULL;
}
void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
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signal_fault_addr = (cell)siginfo->si_addr;
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signal_callstack_top = uap_stack_pointer(uap);
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UAP_PROGRAM_COUNTER(uap) = (cell)memory_signal_handler_impl;
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}
void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
signal_number = signal;
signal_callstack_top = uap_stack_pointer(uap);
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UAP_PROGRAM_COUNTER(uap) = (cell)misc_signal_handler_impl;
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}
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", 0);
}
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void unix_init_signals()
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{
struct sigaction memory_sigaction;
struct sigaction misc_sigaction;
struct sigaction ignore_sigaction;
memset(&memory_sigaction,0,sizeof(struct sigaction));
sigemptyset(&memory_sigaction.sa_mask);
memory_sigaction.sa_sigaction = memory_signal_handler;
memory_sigaction.sa_flags = SA_SIGINFO;
sigaction_safe(SIGBUS,&memory_sigaction,NULL);
sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
memset(&misc_sigaction,0,sizeof(struct sigaction));
sigemptyset(&misc_sigaction.sa_mask);
misc_sigaction.sa_sigaction = misc_signal_handler;
misc_sigaction.sa_flags = SA_SIGINFO;
sigaction_safe(SIGABRT,&misc_sigaction,NULL);
sigaction_safe(SIGFPE,&misc_sigaction,NULL);
sigaction_safe(SIGQUIT,&misc_sigaction,NULL);
sigaction_safe(SIGILL,&misc_sigaction,NULL);
memset(&ignore_sigaction,0,sizeof(struct sigaction));
sigemptyset(&ignore_sigaction.sa_mask);
ignore_sigaction.sa_handler = SIG_IGN;
sigaction_safe(SIGPIPE,&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;
}
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;
else
{
if(errno == EINTR)
return check_write(fd,data,size);
else
return false;
}
}
void safe_write(int fd, void *data, ssize_t size)
{
if(!check_write(fd,data,size))
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;
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(;;)
{
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;
}
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void open_console()
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{
int filedes[2];
if(pipe(filedes) < 0)
fatal_error("Error opening control pipe",errno);
control_read = filedes[0];
control_write = filedes[1];
if(pipe(filedes) < 0)
fatal_error("Error opening size pipe",errno);
size_read = filedes[0];
size_write = filedes[1];
if(pipe(filedes) < 0)
fatal_error("Error opening stdin pipe",errno);
stdin_read = filedes[0];
stdin_write = filedes[1];
start_thread(stdin_loop);
}
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VM_C_API void wait_for_stdin()
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{
if(write(control_write,"X",1) != 1)
{
if(errno == EINTR)
wait_for_stdin();
else
fatal_error("Error writing control fd",errno);
}
}
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}