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/*
* Copyright (c) 2016-2020 The Khronos Group Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* OpenCL is a trademark of Apple Inc. used under license by Khronos.
*/
#include "icd.h"
#include "icd_envvars.h"
#include <dlfcn.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <pthread.h>
static pthread_once_t initialized = PTHREAD_ONCE_INIT;
/*
*
* Vendor enumeration functions
*
*/
// go through the list of vendors in the two configuration files
void khrIcdOsVendorsEnumerate(void)
{
DIR *dir = NULL;
struct dirent *dirEntry = NULL;
const char* vendorPath = ICD_VENDOR_PATH;
char* envPath = NULL;
khrIcdVendorsEnumerateEnv();
envPath = khrIcd_secure_getenv("OCL_ICD_VENDORS");
if (NULL != envPath)
{
vendorPath = envPath;
}
dir = opendir(vendorPath);
if (NULL == dir)
{
KHR_ICD_TRACE("Failed to open path %s, continuing\n", vendorPath);
}
else
{
// attempt to load all files in the directory
for (dirEntry = readdir(dir); dirEntry; dirEntry = readdir(dir))
{
struct stat statBuff;
const char* extension = ".icd";
char* fileName = NULL;
// make sure the file name ends in .icd
if (strlen(extension) > strlen(dirEntry->d_name))
{
continue;
}
if (strcmp(dirEntry->d_name + strlen(dirEntry->d_name) - strlen(extension), extension))
{
continue;
}
// allocate space for the full path of the vendor library name
fileName = malloc(strlen(dirEntry->d_name) + strlen(vendorPath) + 2);
if (!fileName)
{
KHR_ICD_TRACE("Failed allocate space for ICD file path\n");
continue;
}
sprintf(fileName, "%s/%s", vendorPath, dirEntry->d_name);
if (stat(fileName, &statBuff))
{
KHR_ICD_TRACE("Failed stat for: %s, continuing\n", fileName);
free(fileName);
continue;
}
if (S_ISREG(statBuff.st_mode) || S_ISLNK(statBuff.st_mode))
{
FILE *fin = NULL;
char* buffer = NULL;
long bufferSize = 0;
// open the file and read its contents
fin = fopen(fileName, "r");
if (!fin)
{
free(fileName);
continue;
}
fseek(fin, 0, SEEK_END);
bufferSize = ftell(fin);
buffer = malloc(bufferSize+1);
if (!buffer)
{
free(fileName);
fclose(fin);
continue;
}
memset(buffer, 0, bufferSize+1);
fseek(fin, 0, SEEK_SET);
if (bufferSize != (long)fread(buffer, 1, bufferSize, fin))
{
free(fileName);
free(buffer);
fclose(fin);
continue;
}
// ignore a newline at the end of the file
if (buffer[bufferSize-1] == '\n') buffer[bufferSize-1] = '\0';
// load the string read from the file
khrIcdVendorAdd(buffer);
free(fileName);
free(buffer);
fclose(fin);
}
else
{
KHR_ICD_TRACE("File %s is not a regular file nor symbolic link, continuing\n", fileName);
free(fileName);
continue;
}
}
closedir(dir);
}
if (NULL != envPath)
{
khrIcd_free_getenv(envPath);
}
#if defined(CL_ENABLE_LAYERS)
khrIcdLayersEnumerateEnv();
#endif // defined(CL_ENABLE_LAYERS)
}
// go through the list of vendors only once
void khrIcdOsVendorsEnumerateOnce(void)
{
pthread_once(&initialized, khrIcdOsVendorsEnumerate);
}
/*
*
* Dynamic library loading functions
*
*/
// dynamically load a library. returns NULL on failure
void *khrIcdOsLibraryLoad(const char *libraryName)
{
return dlopen (libraryName, RTLD_NOW);
}
// get a function pointer from a loaded library. returns NULL on failure.
void *khrIcdOsLibraryGetFunctionAddress(void *library, const char *functionName)
{
return dlsym(library, functionName);
}
// unload a library
void khrIcdOsLibraryUnload(void *library)
{
dlclose(library);
}
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