factor/vm/os-unix.cpp

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#include "master.hpp"
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namespace factor
{
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THREADHANDLE start_thread(void *(*start_routine)(void *),void *args)
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{
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_JOINABLE) != 0)
fatal_error("pthread_attr_setdetachstate() failed",0);
if (pthread_create (&thread, &attr, start_routine, args) != 0)
fatal_error("pthread_create() failed",0);
pthread_attr_destroy(&attr);
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return thread;
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}
static void *null_dll;
void sleep_nanos(u64 nsec)
{
timespec ts;
timespec ts_rem;
int ret;
ts.tv_sec = nsec / 1000000000;
ts.tv_nsec = nsec % 1000000000;
ret = nanosleep(&ts,&ts_rem);
while(ret == -1 && errno == EINTR)
{
memcpy(&ts, &ts_rem, sizeof(ts));
ret = nanosleep(&ts, &ts_rem);
}
if(ret == -1)
fatal_error("nanosleep failed", 0);
}
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void factor_vm::init_ffi()
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{
null_dll = dlopen(NULL,RTLD_LAZY);
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}
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void factor_vm::ffi_dlopen(dll *dll)
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{
dll->handle = dlopen(alien_offset(dll->path), RTLD_LAZY);
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}
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void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
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{
void *handle = (dll == NULL ? null_dll : dll->handle);
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return dlsym(handle,symbol);
}
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void factor_vm::ffi_dlclose(dll *dll)
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{
if(dlclose(dll->handle))
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general_error(ERROR_FFI,false_object,false_object);
dll->handle = NULL;
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}
void factor_vm::primitive_existsp()
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{
struct stat sb;
char *path = (char *)(untag_check<byte_array>(ctx->pop()) + 1);
ctx->push(tag_boolean(stat(path,&sb) >= 0));
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}
void factor_vm::move_file(const vm_char *path1, const vm_char *path2)
{
int ret = 0;
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do
{
ret = rename((path1),(path2));
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}
while(ret < 0 && errno == EINTR);
if(ret < 0)
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general_error(ERROR_IO,tag_fixnum(errno),false_object);
}
segment::segment(cell size_, bool executable_p)
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{
size = size_;
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int pagesize = getpagesize();
int prot;
if(executable_p)
prot = (PROT_READ | PROT_WRITE | PROT_EXEC);
else
prot = (PROT_READ | PROT_WRITE);
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char *array = (char *)mmap(NULL,pagesize + size + pagesize,prot,MAP_ANON | MAP_PRIVATE,-1,0);
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if(array == (char*)-1) out_of_memory();
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if(mprotect(array,pagesize,PROT_NONE) == -1)
fatal_error("Cannot protect low guard page",(cell)array);
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if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
fatal_error("Cannot protect high guard page",(cell)array);
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start = (cell)(array + pagesize);
end = start + size;
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}
segment::~segment()
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{
int pagesize = getpagesize();
int retval = munmap((void*)(start - pagesize),pagesize + size + pagesize);
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if(retval)
fatal_error("Segment deallocation failed",0);
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}
void factor_vm::dispatch_signal(void *uap, void (handler)())
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{
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UAP_STACK_POINTER(uap) = (UAP_STACK_POINTER_TYPE)fix_callstack_top((stack_frame *)UAP_STACK_POINTER(uap));
UAP_PROGRAM_COUNTER(uap) = (cell)handler;
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ctx->callstack_top = (stack_frame *)UAP_STACK_POINTER(uap);
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}
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void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
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factor_vm *vm = current_vm();
vm->signal_fault_addr = (cell)siginfo->si_addr;
vm->dispatch_signal(uap,factor::memory_signal_handler_impl);
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}
void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
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factor_vm *vm = current_vm();
vm->signal_number = signal;
vm->dispatch_signal(uap,factor::misc_signal_handler_impl);
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}
void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
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factor_vm *vm = current_vm();
vm->signal_number = signal;
vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
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uap_clear_fpu_status(uap);
vm->dispatch_signal(uap,
(siginfo->si_code == FPE_INTDIV || siginfo->si_code == FPE_INTOVF)
? factor::misc_signal_handler_impl
: factor::fp_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 factor_vm::unix_init_signals()
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{
/* OpenBSD doesn't support sigaltstack() if we link against
libpthread. See http://redmine.ruby-lang.org/issues/show/1239 */
#ifndef __OpenBSD__
signal_callstack_seg = new segment(callstack_size,false);
stack_t signal_callstack;
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signal_callstack.ss_sp = (char *)signal_callstack_seg->start;
signal_callstack.ss_size = signal_callstack_seg->size;
signal_callstack.ss_flags = 0;
if(sigaltstack(&signal_callstack,(stack_t *)NULL) < 0)
fatal_error("sigaltstack() failed",0);
#endif
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struct sigaction memory_sigaction;
struct sigaction misc_sigaction;
struct sigaction fpe_sigaction;
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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 | SA_ONSTACK;
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sigaction_safe(SIGBUS,&memory_sigaction,NULL);
sigaction_safe(SIGSEGV,&memory_sigaction,NULL);
memset(&fpe_sigaction,0,sizeof(struct sigaction));
sigemptyset(&fpe_sigaction.sa_mask);
fpe_sigaction.sa_sigaction = fpe_signal_handler;
fpe_sigaction.sa_flags = SA_SIGINFO | SA_ONSTACK;
sigaction_safe(SIGFPE,&fpe_sigaction,NULL);
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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 | SA_ONSTACK;
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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);
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}
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);
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}
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);
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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]);
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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);
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control_read = filedes[0];
control_write = filedes[1];
if(pipe(filedes) < 0)
fatal_error("Error opening size pipe",errno);
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size_read = filedes[0];
size_write = filedes[1];
if(pipe(filedes) < 0)
fatal_error("Error opening stdin pipe",errno);
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stdin_read = filedes[0];
stdin_write = filedes[1];
start_thread(stdin_loop,NULL);
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}
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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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}
}
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}