system_utils_linux.cpp

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Author : Jamie Madill
Date : 2017-01-06 10:43:44
Hash : a66779fc
Message : Vulkan: Load layers relative to executable dir. Instead of baking in a relative path and expecting the app to run from a fixed directory, we can change the CWD at runtime so the layers can load relative to the current executable directory. Future alternatives could include modifying the layers SDK to provide a path dynamically, but for now the relative paths must be baked in at compile-time. BUG=angleproject:1319 BUG=chromium:677841 Change-Id: I443b6b35d38276ea667cdf08ec2204ea280b6cec Reviewed-on: https://chromium-review.googlesource.com/425441 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Frank Henigman <fjhenigman@chromium.org>

src/common/system_utils_linux.cpp

//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// system_utils_linux.cpp: Implementation of OS-specific functions for Linux

#include "system_utils.h"

#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include <array>

namespace angle
{

namespace
{

std::string GetExecutablePathImpl()
{
    // We cannot use lstat to get the size of /proc/self/exe as it always returns 0
    // so we just use a big buffer and hope the path fits in it.
    char path[4096];

    ssize_t result = readlink("/proc/self/exe", path, sizeof(path) - 1);
    if (result < 0 || static_cast<size_t>(result) >= sizeof(path) - 1)
    {
        return "";
    }

    path[result] = '\0';
    return path;
}

std::string GetExecutableDirectoryImpl()
{
    std::string executablePath = GetExecutablePath();
    size_t lastPathSepLoc      = executablePath.find_last_of("/");
    return (lastPathSepLoc != std::string::npos) ? executablePath.substr(0, lastPathSepLoc) : "";
}

}  // anonymous namespace

const char *GetExecutablePath()
{
    // TODO(jmadill): Make global static string thread-safe.
    const static std::string &exePath = GetExecutablePathImpl();
    return exePath.c_str();
}

const char *GetExecutableDirectory()
{
    // TODO(jmadill): Make global static string thread-safe.
    const static std::string &exeDir = GetExecutableDirectoryImpl();
    return exeDir.c_str();
}

const char *GetSharedLibraryExtension()
{
    return "so";
}

Optional<std::string> GetCWD()
{
    std::array<char, 4096> pathBuf;
    char *result = getcwd(pathBuf.data(), pathBuf.size());
    if (result == nullptr)
    {
        return Optional<std::string>::Invalid();
    }
    return std::string(pathBuf.data());
}

bool SetCWD(const char *dirName)
{
    return (chdir(dirName) == 0);
}

}  // namespace angle

kc3-lang/angle/src/common/system_utils_linux.cpp

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kc3-lang/angle /src/common/system_utils_linux.cpp