зеркало из https://github.com/github/ruby.git
431 строка
9.7 KiB
C
431 строка
9.7 KiB
C
/* -*- C -*-
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* $Id$
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*/
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#include <ruby.h>
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#include "dl.h"
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VALUE rb_cDLHandle;
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#ifdef _WIN32
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# ifndef _WIN32_WCE
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static void *
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w32_coredll(void)
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{
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MEMORY_BASIC_INFORMATION m;
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memset(&m, 0, sizeof(m));
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if( !VirtualQuery(_errno, &m, sizeof(m)) ) return NULL;
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return m.AllocationBase;
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}
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# endif
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static int
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w32_dlclose(void *ptr)
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{
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# ifndef _WIN32_WCE
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if( ptr == w32_coredll() ) return 0;
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# endif
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if( FreeLibrary((HMODULE)ptr) ) return 0;
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return errno = rb_w32_map_errno(GetLastError());
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}
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#define dlclose(ptr) w32_dlclose(ptr)
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#endif
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static void
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dlhandle_free(void *ptr)
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{
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struct dl_handle *dlhandle = ptr;
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if( dlhandle->ptr && dlhandle->open && dlhandle->enable_close ){
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dlclose(dlhandle->ptr);
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}
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}
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static size_t
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dlhandle_memsize(const void *ptr)
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{
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return ptr ? sizeof(struct dl_handle) : 0;
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}
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static const rb_data_type_t dlhandle_data_type = {
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"dl/handle",
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{0, dlhandle_free, dlhandle_memsize,},
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};
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/*
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* call-seq: close
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*
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* Close this DL::Handle. Calling close more than once will raise a
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* DL::DLError exception.
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*/
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VALUE
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rb_dlhandle_close(VALUE self)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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if(dlhandle->open) {
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int ret = dlclose(dlhandle->ptr);
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dlhandle->open = 0;
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/* Check dlclose for successful return value */
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if(ret) {
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#if defined(HAVE_DLERROR)
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rb_raise(rb_eDLError, "%s", dlerror());
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#else
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rb_raise(rb_eDLError, "could not close handle");
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#endif
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}
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return INT2NUM(ret);
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}
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rb_raise(rb_eDLError, "dlclose() called too many times");
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UNREACHABLE;
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}
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VALUE
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rb_dlhandle_s_allocate(VALUE klass)
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{
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VALUE obj;
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struct dl_handle *dlhandle;
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obj = TypedData_Make_Struct(rb_cDLHandle, struct dl_handle, &dlhandle_data_type, dlhandle);
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dlhandle->ptr = 0;
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dlhandle->open = 0;
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dlhandle->enable_close = 0;
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return obj;
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}
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static VALUE
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predefined_dlhandle(void *handle)
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{
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VALUE obj = rb_dlhandle_s_allocate(rb_cDLHandle);
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struct dl_handle *dlhandle = DATA_PTR(obj);
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dlhandle->ptr = handle;
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dlhandle->open = 1;
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OBJ_FREEZE(obj);
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return obj;
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}
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/*
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* call-seq:
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* initialize(lib = nil, flags = DL::RTLD_LAZY | DL::RTLD_GLOBAL)
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*
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* Create a new handler that opens library named +lib+ with +flags+. If no
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* library is specified, RTLD_DEFAULT is used.
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*/
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VALUE
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rb_dlhandle_initialize(int argc, VALUE argv[], VALUE self)
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{
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void *ptr;
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struct dl_handle *dlhandle;
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VALUE lib, flag;
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char *clib;
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int cflag;
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const char *err;
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switch( rb_scan_args(argc, argv, "02", &lib, &flag) ){
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case 0:
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clib = NULL;
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cflag = RTLD_LAZY | RTLD_GLOBAL;
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break;
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case 1:
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clib = NIL_P(lib) ? NULL : StringValuePtr(lib);
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cflag = RTLD_LAZY | RTLD_GLOBAL;
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break;
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case 2:
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clib = NIL_P(lib) ? NULL : StringValuePtr(lib);
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cflag = NUM2INT(flag);
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break;
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default:
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rb_bug("rb_dlhandle_new");
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}
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rb_secure(2);
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#if defined(_WIN32)
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if( !clib ){
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HANDLE rb_libruby_handle(void);
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ptr = rb_libruby_handle();
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}
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else if( STRCASECMP(clib, "libc") == 0
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# ifdef RUBY_COREDLL
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|| STRCASECMP(clib, RUBY_COREDLL) == 0
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|| STRCASECMP(clib, RUBY_COREDLL".dll") == 0
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# endif
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){
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# ifdef _WIN32_WCE
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ptr = dlopen("coredll.dll", cflag);
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# else
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ptr = w32_coredll();
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# endif
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}
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else
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#endif
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ptr = dlopen(clib, cflag);
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#if defined(HAVE_DLERROR)
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if( !ptr && (err = dlerror()) ){
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rb_raise(rb_eDLError, "%s", err);
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}
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#else
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if( !ptr ){
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err = dlerror();
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rb_raise(rb_eDLError, "%s", err);
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}
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#endif
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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if( dlhandle->ptr && dlhandle->open && dlhandle->enable_close ){
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dlclose(dlhandle->ptr);
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}
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dlhandle->ptr = ptr;
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dlhandle->open = 1;
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dlhandle->enable_close = 0;
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if( rb_block_given_p() ){
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rb_ensure(rb_yield, self, rb_dlhandle_close, self);
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}
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return Qnil;
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}
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/*
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* call-seq: enable_close
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*
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* Enable a call to dlclose() when this DL::Handle is garbage collected.
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*/
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VALUE
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rb_dlhandle_enable_close(VALUE self)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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dlhandle->enable_close = 1;
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return Qnil;
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}
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/*
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* call-seq: disable_close
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*
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* Disable a call to dlclose() when this DL::Handle is garbage collected.
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*/
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VALUE
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rb_dlhandle_disable_close(VALUE self)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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dlhandle->enable_close = 0;
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return Qnil;
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}
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/*
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* call-seq: close_enabled?
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*
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* Returns +true+ if dlclose() will be called when this DL::Handle is
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* garbage collected.
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*/
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static VALUE
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rb_dlhandle_close_enabled_p(VALUE self)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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if(dlhandle->enable_close) return Qtrue;
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return Qfalse;
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}
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/*
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* call-seq: to_i
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*
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* Returns the memory address for this handle.
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*/
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VALUE
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rb_dlhandle_to_i(VALUE self)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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return PTR2NUM(dlhandle);
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}
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static VALUE dlhandle_sym(void *handle, const char *symbol);
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/*
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* Document-method: sym
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* Document-method: []
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*
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* call-seq: sym(name)
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*
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* Get the address as an Integer for the function named +name+.
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*/
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VALUE
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rb_dlhandle_sym(VALUE self, VALUE sym)
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{
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struct dl_handle *dlhandle;
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TypedData_Get_Struct(self, struct dl_handle, &dlhandle_data_type, dlhandle);
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if( ! dlhandle->open ){
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rb_raise(rb_eDLError, "closed handle");
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}
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return dlhandle_sym(dlhandle->ptr, StringValueCStr(sym));
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}
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#ifndef RTLD_NEXT
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#define RTLD_NEXT NULL
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#endif
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#ifndef RTLD_DEFAULT
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#define RTLD_DEFAULT NULL
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#endif
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/*
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* Document-method: sym
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* Document-method: []
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*
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* call-seq: sym(name)
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*
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* Get the address as an Integer for the function named +name+. The function
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* is searched via dlsym on RTLD_NEXT. See man(3) dlsym() for more info.
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*/
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VALUE
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rb_dlhandle_s_sym(VALUE self, VALUE sym)
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{
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return dlhandle_sym(RTLD_NEXT, StringValueCStr(sym));
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}
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static VALUE
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dlhandle_sym(void *handle, const char *name)
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{
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#if defined(HAVE_DLERROR)
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const char *err;
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# define CHECK_DLERROR if( err = dlerror() ){ func = 0; }
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#else
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# define CHECK_DLERROR
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#endif
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void (*func)();
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rb_secure(2);
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#ifdef HAVE_DLERROR
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dlerror();
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#endif
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func = (void (*)())(VALUE)dlsym(handle, name);
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CHECK_DLERROR;
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#if defined(FUNC_STDCALL)
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if( !func ){
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int i;
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int len = (int)strlen(name);
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char *name_n;
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#if defined(__CYGWIN__) || defined(_WIN32) || defined(__MINGW32__)
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{
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char *name_a = (char*)xmalloc(len+2);
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strcpy(name_a, name);
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name_n = name_a;
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name_a[len] = 'A';
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name_a[len+1] = '\0';
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func = dlsym(handle, name_a);
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CHECK_DLERROR;
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if( func ) goto found;
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name_n = xrealloc(name_a, len+6);
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}
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#else
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name_n = (char*)xmalloc(len+6);
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#endif
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memcpy(name_n, name, len);
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name_n[len++] = '@';
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for( i = 0; i < 256; i += 4 ){
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sprintf(name_n + len, "%d", i);
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func = dlsym(handle, name_n);
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CHECK_DLERROR;
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if( func ) break;
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}
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if( func ) goto found;
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name_n[len-1] = 'A';
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name_n[len++] = '@';
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for( i = 0; i < 256; i += 4 ){
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sprintf(name_n + len, "%d", i);
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func = dlsym(handle, name_n);
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CHECK_DLERROR;
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if( func ) break;
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}
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found:
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xfree(name_n);
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}
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#endif
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if( !func ){
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rb_raise(rb_eDLError, "unknown symbol \"%s\"", name);
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}
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return PTR2NUM(func);
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}
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void
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Init_dlhandle(void)
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{
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/*
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* Document-class: DL::Handle
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*
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* The DL::Handle is the manner to access the dynamic library
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*
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* == Example
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*
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* === Setup
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*
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* libc_so = "/lib64/libc.so.6"
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* => "/lib64/libc.so.6"
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* @handle = DL::Handle.new(libc_so)
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* => #<DL::Handle:0x00000000d69ef8>
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*
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* === Setup, with flags
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*
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* libc_so = "/lib64/libc.so.6"
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* => "/lib64/libc.so.6"
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* @handle = DL::Handle.new(libc_so, DL::RTLD_LAZY | DL::RTLD_GLOBAL)
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* => #<DL::Handle:0x00000000d69ef8>
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*
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* === Addresses to symbols
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*
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* strcpy_addr = @handle['strcpy']
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* => 140062278451968
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*
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* or
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*
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* strcpy_addr = @handle.sym('strcpy')
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* => 140062278451968
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*
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*/
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rb_cDLHandle = rb_define_class_under(rb_mDL, "Handle", rb_cObject);
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rb_define_alloc_func(rb_cDLHandle, rb_dlhandle_s_allocate);
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rb_define_singleton_method(rb_cDLHandle, "sym", rb_dlhandle_s_sym, 1);
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rb_define_singleton_method(rb_cDLHandle, "[]", rb_dlhandle_s_sym, 1);
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/* Document-const: NEXT
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*
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* A predefined pseudo-handle of RTLD_NEXT
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*
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* Which will find the next occurrence of a function in the search order
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* after the current library.
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*/
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rb_define_const(rb_cDLHandle, "NEXT", predefined_dlhandle(RTLD_NEXT));
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/* Document-const: DEFAULT
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*
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* A predefined pseudo-handle of RTLD_DEFAULT
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*
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* Which will find the first occurrence of the desired symbol using the
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* default library search order
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*/
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rb_define_const(rb_cDLHandle, "DEFAULT", predefined_dlhandle(RTLD_DEFAULT));
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rb_define_method(rb_cDLHandle, "initialize", rb_dlhandle_initialize, -1);
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rb_define_method(rb_cDLHandle, "to_i", rb_dlhandle_to_i, 0);
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rb_define_method(rb_cDLHandle, "close", rb_dlhandle_close, 0);
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rb_define_method(rb_cDLHandle, "sym", rb_dlhandle_sym, 1);
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rb_define_method(rb_cDLHandle, "[]", rb_dlhandle_sym, 1);
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rb_define_method(rb_cDLHandle, "disable_close", rb_dlhandle_disable_close, 0);
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rb_define_method(rb_cDLHandle, "enable_close", rb_dlhandle_enable_close, 0);
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rb_define_method(rb_cDLHandle, "close_enabled?", rb_dlhandle_close_enabled_p, 0);
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}
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/* mode: c; tab-with=8; sw=4; ts=8; noexpandtab: */
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