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//===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file defines things specific to Unix implementations.
//=== WARNING: Implementation here must contain only generic UNIX code that
//=== is guaranteed to work on all UNIX variants.
#include "llvm/Config/config.h"
#include "llvm/Support/Chrono.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/ErrorHandling.h"
#include <algorithm>
#include <assert.h>
#include <cerrno>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
# include <sys/time.h>
#include <time.h>
# include <dlfcn.h>
# include <fcntl.h>
/// This function builds an error message into \p ErrMsg using the \p prefix
/// string and the Unix error number given by \p errnum. If errnum is -1, the
/// default then the value of errno is used.
/// Make an error message
/// If the error number can be converted to a string, it will be
/// separated from prefix by ": ".
static inline bool MakeErrMsg(
std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
if (!ErrMsg)
return true;
if (errnum == -1)
errnum = errno;
*ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
return true;
// Include StrError(errnum) in a fatal error message.
[[noreturn]] static inline void ReportErrnumFatal(const char *Msg, int errnum) {
std::string ErrMsg;
MakeErrMsg(&ErrMsg, Msg, errnum);
namespace llvm {
namespace sys {
/// Convert a struct timeval to a duration. Note that timeval can be used both
/// as a time point and a duration. Be sure to check what the input represents.
inline std::chrono::microseconds toDuration(const struct timeval &TV) {
return std::chrono::seconds(TV.tv_sec) +
/// Convert a time point to struct timespec.
inline struct timespec toTimeSpec(TimePoint<> TP) {
using namespace std::chrono;
struct timespec RetVal;
RetVal.tv_sec = toTimeT(TP);
RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
return RetVal;
/// Convert a time point to struct timeval.
inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
using namespace std::chrono;
struct timeval RetVal;
RetVal.tv_sec = toTimeT(TP);
RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
return RetVal;
} // namespace sys
} // namespace llvm