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//===-- HostInfoPosix.cpp ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#if !defined(LLDB_DISABLE_PYTHON)
#include "Plugins/ScriptInterpreter/Python/lldb-python.h"
#endif
#include "lldb/Host/posix/HostInfoPosix.h"
#include "lldb/Utility/Log.h"
#include "clang/Basic/Version.h"
#include "clang/Config/config.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <grp.h>
#include <limits.h>
#include <mutex>
#include <netdb.h>
#include <pwd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
using namespace lldb_private;
size_t HostInfoPosix::GetPageSize() { return ::getpagesize(); }
bool HostInfoPosix::GetHostname(std::string &s) {
char hostname[PATH_MAX];
hostname[sizeof(hostname) - 1] = '\0';
if (::gethostname(hostname, sizeof(hostname) - 1) == 0) {
struct hostent *h = ::gethostbyname(hostname);
if (h)
s.assign(h->h_name);
else
s.assign(hostname);
return true;
}
return false;
}
#ifdef __ANDROID__
#include <android/api-level.h>
#endif
#if defined(__ANDROID_API__) && __ANDROID_API__ < 21
#define USE_GETPWUID
#endif
#ifdef USE_GETPWUID
static std::mutex s_getpwuid_lock;
#endif
const char *HostInfoPosix::LookupUserName(uint32_t uid,
std::string &user_name) {
#ifdef USE_GETPWUID
// getpwuid_r is missing from android-9
// make getpwuid thread safe with a mutex
std::lock_guard<std::mutex> lock(s_getpwuid_lock);
struct passwd *user_info_ptr = ::getpwuid(uid);
if (user_info_ptr) {
user_name.assign(user_info_ptr->pw_name);
return user_name.c_str();
}
#else
struct passwd user_info;
struct passwd *user_info_ptr = &user_info;
char user_buffer[PATH_MAX];
size_t user_buffer_size = sizeof(user_buffer);
if (::getpwuid_r(uid, &user_info, user_buffer, user_buffer_size,
&user_info_ptr) == 0) {
if (user_info_ptr) {
user_name.assign(user_info_ptr->pw_name);
return user_name.c_str();
}
}
#endif
user_name.clear();
return nullptr;
}
const char *HostInfoPosix::LookupGroupName(uint32_t gid,
std::string &group_name) {
#ifndef __ANDROID__
char group_buffer[PATH_MAX];
size_t group_buffer_size = sizeof(group_buffer);
struct group group_info;
struct group *group_info_ptr = &group_info;
// Try the threadsafe version first
if (::getgrgid_r(gid, &group_info, group_buffer, group_buffer_size,
&group_info_ptr) == 0) {
if (group_info_ptr) {
group_name.assign(group_info_ptr->gr_name);
return group_name.c_str();
}
} else {
// The threadsafe version isn't currently working for me on darwin, but the
// non-threadsafe version
// is, so I am calling it below.
group_info_ptr = ::getgrgid(gid);
if (group_info_ptr) {
group_name.assign(group_info_ptr->gr_name);
return group_name.c_str();
}
}
group_name.clear();
#else
assert(false && "getgrgid_r() not supported on Android");
#endif
return NULL;
}
uint32_t HostInfoPosix::GetUserID() { return getuid(); }
uint32_t HostInfoPosix::GetGroupID() { return getgid(); }
uint32_t HostInfoPosix::GetEffectiveUserID() { return geteuid(); }
uint32_t HostInfoPosix::GetEffectiveGroupID() { return getegid(); }
FileSpec HostInfoPosix::GetDefaultShell() { return FileSpec("/bin/sh", false); }
bool HostInfoPosix::ComputePathRelativeToLibrary(FileSpec &file_spec,
llvm::StringRef dir) {
Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_HOST);
FileSpec lldb_file_spec;
if (!GetLLDBPath(lldb::ePathTypeLLDBShlibDir, lldb_file_spec))
return false;
std::string raw_path = lldb_file_spec.GetPath();
// drop library directory
llvm::StringRef parent_path = llvm::sys::path::parent_path(raw_path);
// Most Posix systems (e.g. Linux/*BSD) will attempt to replace a */lib with
// */bin as the base directory for helper exe programs. This will fail if the
// /lib and /bin directories are rooted in entirely different trees.
if (log)
log->Printf("HostInfoPosix::ComputePathRelativeToLibrary() attempting to "
"derive the %s path from this path: %s",
dir.data(), raw_path.c_str());
if (!parent_path.empty()) {
// Now write in bin in place of lib.
raw_path = (parent_path + dir).str();
if (log)
log->Printf("Host::%s() derived the bin path as: %s", __FUNCTION__,
raw_path.c_str());
} else {
if (log)
log->Printf("Host::%s() failed to find /lib/liblldb within the shared "
"lib path, bailing on bin path construction",
__FUNCTION__);
}
file_spec.GetDirectory().SetString(raw_path);
return (bool)file_spec.GetDirectory();
}
bool HostInfoPosix::ComputeSupportExeDirectory(FileSpec &file_spec) {
return ComputePathRelativeToLibrary(file_spec, "/bin");
}
bool HostInfoPosix::ComputeClangDirectory(FileSpec &file_spec) {
return ComputePathRelativeToLibrary(
file_spec, (llvm::Twine("/lib") + CLANG_LIBDIR_SUFFIX + "/clang/" +
CLANG_VERSION_STRING)
.str());
}
bool HostInfoPosix::ComputeHeaderDirectory(FileSpec &file_spec) {
FileSpec temp_file("/opt/local/include/lldb", false);
file_spec.GetDirectory().SetCString(temp_file.GetPath().c_str());
return true;
}
bool HostInfoPosix::ComputePythonDirectory(FileSpec &file_spec) {
#ifndef LLDB_DISABLE_PYTHON
FileSpec lldb_file_spec;
if (!GetLLDBPath(lldb::ePathTypeLLDBShlibDir, lldb_file_spec))
return false;
char raw_path[PATH_MAX];
lldb_file_spec.GetPath(raw_path, sizeof(raw_path));
#if defined(LLDB_PYTHON_RELATIVE_LIBDIR)
// Build the path by backing out of the lib dir, then building
// with whatever the real python interpreter uses. (e.g. lib
// for most, lib64 on RHEL x86_64).
char python_path[PATH_MAX];
::snprintf(python_path, sizeof(python_path), "%s/../%s", raw_path,
LLDB_PYTHON_RELATIVE_LIBDIR);
char final_path[PATH_MAX];
realpath(python_path, final_path);
file_spec.GetDirectory().SetCString(final_path);
return true;
#else
llvm::SmallString<256> python_version_dir;
llvm::raw_svector_ostream os(python_version_dir);
os << "/python" << PY_MAJOR_VERSION << '.' << PY_MINOR_VERSION
<< "/site-packages";
// We may get our string truncated. Should we protect this with an assert?
::strncat(raw_path, python_version_dir.c_str(),
sizeof(raw_path) - strlen(raw_path) - 1);
file_spec.GetDirectory().SetCString(raw_path);
return true;
#endif
#else
return false;
#endif
}
bool HostInfoPosix::GetEnvironmentVar(const std::string &var_name,
std::string &var) {
if (const char *pvar = ::getenv(var_name.c_str())) {
var = std::string(pvar);
return true;
}
return false;
}
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