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// Copyright 2012 Intel Corporation
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <stdbool.h>
#include <stdlib.h>
#include <dlfcn.h>
#include "wcore_error.h"
#include "wcore_util.h"
#include "linux_dl.h"
struct linux_dl {
/// @brief For example, "libGLESv2.so".
const char *name;
/// @brief The library obtained with dlopen().
///
/// The library is initialized if and only if `dl != NULL`.
void *dl;
};
static const char*
linux_dl_get_name(int32_t waffle_dl)
{
switch (waffle_dl) {
case WAFFLE_DL_OPENGL:
return "libGL.so.1";
case WAFFLE_DL_OPENGL_ES1:
return "libGLESv1_CM.so";
case WAFFLE_DL_OPENGL_ES2:
case WAFFLE_DL_OPENGL_ES3:
// As of 2014-04-20, Mesa statically provides the ES2 and ES3
// symbols symbols in libGLESv2.so and provides no ES3-only library
//
// Even though Waffle does not use the library's soname, note that
// Mesa did not change the library's soname when it added the ES3
// symbols. The soname was and is libGLESv2.so.2 before and after
// ES3.
return "libGLESv2.so";
default:
wcore_error_internal("waffle_dl has bad value %#x", waffle_dl);
return NULL;
}
}
struct linux_dl*
linux_dl_open(int32_t waffle_dl)
{
struct linux_dl *self = wcore_calloc(sizeof(*self));
if (self == NULL)
return NULL;
self->name = linux_dl_get_name(waffle_dl);
if (!self->name)
goto error;
self->dl = dlopen(self->name, RTLD_LAZY);
if (!self->dl) {
wcore_errorf(WAFFLE_ERROR_UNKNOWN,
"dlopen(\"%s\") failed: %s", self->name, dlerror());
goto error;
}
return self;
error:
free(self);
return NULL;
}
bool
linux_dl_close(struct linux_dl *self)
{
int error = 0;
if (!self)
return true;
if (self->dl) {
error = dlclose(self->dl);
if (error) {
wcore_errorf(WAFFLE_ERROR_UNKNOWN,
"dlclose(libname=\"%s\") failed: %s",
self->name, dlerror());
}
}
free(self);
return error == 0;
}
void*
linux_dl_sym(struct linux_dl *self, const char *symbol)
{
// Clear any previous error.
dlerror();
void *sym = dlsym(self->dl, symbol);
const char *error = dlerror();
if (error) {
wcore_errorf(WAFFLE_ERROR_UNKNOWN,
"dlsym(libname=\"%s\", \"%s\") failed: %s",
self->name, symbol, error);
return NULL;
}
return sym;
}
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