/usr/include/shevek/dl.hh is in libshevek-dev 1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 | /* dl.hh - load dynamic libraries
* Copyright 2005 Bas Wijnen <wijnen@debian.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SHEVEK_DL_HH
#define SHEVEK_DL_HH
#include <string>
#include "dlfcn.h"
#include "refbase.hh"
#include "error.hh"
namespace shevek
{
/// Load symbols from dynamic libraries.
/** Usage: create, open, get, get, ..., close
*/
class dl : public refbase
{
void *m_handle;
public:
/// Create a new dl object.
static Glib::RefPtr <dl> create () { return Glib::RefPtr <dl> (new dl ()); }
/// Close object and free structures.
~dl ();
/// Open a shared library.
void open (std::string const &file = std::string ());
/// Close the library, freeing the resources.
/** This is done automatically if open is called again, or the object is destroyed.
*/
void close ();
/// Get a symbol from the library.
/** Its type must be given by the caller and cannot be checked for correctness.
*/
template <typename T> T &get (std::string const &name);
protected:
dl ();
};
template <typename T> T &dl::get (std::string const &name)
{
if (!m_handle)
shevek_error ("unable to get symbol: no valid handle");
union
{
void *input;
T *output;
} hack;
hack.input = dlsym (m_handle, name.c_str ());
if (!hack.input)
shevek_error (ostring ("unable to get symbol: %s", dlerror ()));
return *hack.output;
}
}
#endif
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