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os-unix.cpp
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os-unix.cpp
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#include "master.hpp"
namespace factor
{
THREADHANDLE start_thread(void *(*start_routine)(void *),void *args)
{
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);
return thread;
}
pthread_key_t tlsKey = 0;
void init_platform_globals()
{
if (pthread_key_create(&tlsKey, NULL) != 0)
fatal_error("pthread_key_create() failed",0);
}
void register_vm_with_thread(factor_vm *vm)
{
pthread_setspecific(tlsKey,vm);
}
factor_vm *tls_vm()
{
factor_vm *vm = (factor_vm*)pthread_getspecific(tlsKey);
assert(vm != NULL);
return vm;
}
static void *null_dll;
u64 system_micros()
{
struct timeval t;
gettimeofday(&t,NULL);
return (u64)t.tv_sec * 1000000 + t.tv_usec;
}
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);
}
void factor_vm::init_ffi()
{
/* NULL_DLL is "libfactor.dylib" for OS X and NULL for generic unix */
null_dll = dlopen(NULL_DLL,RTLD_LAZY);
}
void factor_vm::ffi_dlopen(dll *dll)
{
dll->handle = dlopen(alien_offset(dll->path), RTLD_LAZY);
}
void *factor_vm::ffi_dlsym(dll *dll, symbol_char *symbol)
{
void *handle = (dll == NULL ? null_dll : dll->handle);
return dlsym(handle,symbol);
}
void factor_vm::ffi_dlclose(dll *dll)
{
if(dlclose(dll->handle))
general_error(ERROR_FFI,false_object,false_object,NULL);
dll->handle = NULL;
}
void factor_vm::primitive_existsp()
{
struct stat sb;
char *path = (char *)(untag_check<byte_array>(ctx->pop()) + 1);
ctx->push(tag_boolean(stat(path,&sb) >= 0));
}
void factor_vm::move_file(const vm_char *path1, const vm_char *path2)
{
int ret = 0;
do {
ret = rename((path1),(path2));
} while(ret < 0 && errno == EINTR);
if(ret < 0)
general_error(ERROR_IO,tag_fixnum(errno),false_object,NULL);
}
segment::segment(cell size_, bool executable_p)
{
size = size_;
int pagesize = getpagesize();
int prot;
if(executable_p)
prot = (PROT_READ | PROT_WRITE | PROT_EXEC);
else
prot = (PROT_READ | PROT_WRITE);
char *array = (char *)mmap(NULL,pagesize + size + pagesize,prot,MAP_ANON | MAP_PRIVATE,-1,0);
if(array == (char*)-1) out_of_memory();
if(mprotect(array,pagesize,PROT_NONE) == -1)
fatal_error("Cannot protect low guard page",(cell)array);
if(mprotect(array + pagesize + size,pagesize,PROT_NONE) == -1)
fatal_error("Cannot protect high guard page",(cell)array);
start = (cell)(array + pagesize);
end = start + size;
}
segment::~segment()
{
int pagesize = getpagesize();
int retval = munmap((void*)(start - pagesize),pagesize + size + pagesize);
if(retval)
fatal_error("Segment deallocation failed",0);
}
void factor_vm::dispatch_signal(void *uap, void (handler)())
{
if(in_code_heap_p(UAP_PROGRAM_COUNTER(uap)))
{
stack_frame *ptr = (stack_frame *)UAP_STACK_POINTER(uap);
assert(ptr);
signal_callstack_top = ptr;
}
else
signal_callstack_top = NULL;
UAP_STACK_POINTER(uap) = align_stack_pointer(UAP_STACK_POINTER(uap));
UAP_PROGRAM_COUNTER(uap) = (cell)handler;
}
void memory_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
factor_vm *vm = tls_vm();
vm->signal_fault_addr = (cell)siginfo->si_addr;
vm->dispatch_signal(uap,factor::memory_signal_handler_impl);
}
void misc_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
factor_vm *vm = tls_vm();
vm->signal_number = signal;
vm->dispatch_signal(uap,factor::misc_signal_handler_impl);
}
void fpe_signal_handler(int signal, siginfo_t *siginfo, void *uap)
{
factor_vm *vm = tls_vm();
vm->signal_number = signal;
vm->signal_fpu_status = fpu_status(uap_fpu_status(uap));
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);
}
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);
}
void unix_init_signals()
{
struct sigaction memory_sigaction;
struct sigaction misc_sigaction;
struct sigaction fpe_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(&fpe_sigaction,0,sizeof(struct sigaction));
sigemptyset(&fpe_sigaction.sa_mask);
fpe_sigaction.sa_sigaction = fpe_signal_handler;
fpe_sigaction.sa_flags = SA_SIGINFO;
sigaction_safe(SIGFPE,&fpe_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(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;
}
void open_console()
{
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,NULL);
}
VM_C_API void wait_for_stdin()
{
if(write(control_write,"X",1) != 1)
{
if(errno == EINTR)
wait_for_stdin();
else
fatal_error("Error writing control fd",errno);
}
}
}