bool GetEntrypointExecutableAbsolutePath(std::string& entrypointExecutable)
{
bool result = false;
entrypointExecutable.clear();
// Get path to the executable for the current process using
// platform specific means.
#if defined(__LINUX__) || !defined(__APPLE__)
// On non-Mac OS, return the symlink that will be resolved by GetAbsolutePath
// to fetch the entrypoint EXE absolute path, inclusive of filename.
entrypointExecutable.assign(symlinkEntrypointExecutable);
result = true;
#elif defined(__APPLE__)
// On Mac, we ask the OS for the absolute path to the entrypoint executable
uint32_t lenActualPath = 0;
if (_NSGetExecutablePath(nullptr, &lenActualPath) == -1)
{
// OSX has placed the actual path length in lenActualPath,
// so re-attempt the operation
std::string resizedPath(lenActualPath, '\0');
char *pResizedPath = const_cast<char *>(resizedPath.c_str());
if (_NSGetExecutablePath(pResizedPath, &lenActualPath) == 0)
{
entrypointExecutable.assign(pResizedPath);
result = true;
}
}
#endif
return result;
}
bool GetEntrypointExecutableAbsolutePath(std::string& entrypointExecutable)
{
bool result = false;
entrypointExecutable.clear();
// Get path to the executable for the current process using
// platform specific means.
#if defined(__linux__) || (defined(__NetBSD__) && !defined(KERN_PROC_PATHNAME))
// On Linux, fetch the entry point EXE absolute path, inclusive of filename.
char exe[PATH_MAX];
ssize_t res = readlink(symlinkEntrypointExecutable, exe, PATH_MAX - 1);
if (res != -1)
{
exe[res] = '\0';
entrypointExecutable.assign(exe);
result = true;
}
else
{
result = false;
}
#elif defined(__APPLE__)
// On Mac, we ask the OS for the absolute path to the entrypoint executable
uint32_t lenActualPath = 0;
if (_NSGetExecutablePath(nullptr, &lenActualPath) == -1)
{
// OSX has placed the actual path length in lenActualPath,
// so re-attempt the operation
std::string resizedPath(lenActualPath, '\0');
char *pResizedPath = const_cast<char *>(resizedPath.c_str());
if (_NSGetExecutablePath(pResizedPath, &lenActualPath) == 0)
{
entrypointExecutable.assign(pResizedPath);
result = true;
}
}
#elif defined(__NetBSD__) && defined(KERN_PROC_PATHNAME)
static const int name[] = {
CTL_KERN, KERN_PROC_ARGS, -1, KERN_PROC_PATHNAME,
};
char path[MAXPATHLEN];
size_t len;
len = sizeof(path);
if (sysctl(name, __arraycount(name), path, &len, NULL, 0) != -1)
{
entrypointExecutable.assign(path);
result = true;
}
else
{
result = false;
}
#else
// On non-Mac OS, return the symlink that will be resolved by GetAbsolutePath
// to fetch the entrypoint EXE absolute path, inclusive of filename.
entrypointExecutable.assign(symlinkEntrypointExecutable);
result = true;
#endif
return result;
}