1//===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8// 9// This file defines things specific to Unix implementations. 10// 11//===----------------------------------------------------------------------===// 12 13#ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H 14#define LLVM_LIB_SUPPORT_UNIX_UNIX_H 15 16//===----------------------------------------------------------------------===// 17//=== WARNING: Implementation here must contain only generic UNIX code that 18//=== is guaranteed to work on all UNIX variants. 19//===----------------------------------------------------------------------===// 20 21#include "llvm/Config/config.h" 22#include "llvm/Support/Chrono.h" 23#include "llvm/Support/Errno.h" 24#include "llvm/Support/ErrorHandling.h" 25#include <algorithm> 26#include <assert.h> 27#include <cerrno> 28#include <cstdio> 29#include <cstdlib> 30#include <cstring> 31#include <string> 32#include <sys/types.h> 33#include <sys/wait.h> 34 35#ifdef HAVE_UNISTD_H 36#include <unistd.h> 37#endif 38 39#ifdef HAVE_SYS_TIME_H 40# include <sys/time.h> 41#endif 42#include <time.h> 43 44#ifdef HAVE_DLFCN_H 45# include <dlfcn.h> 46#endif 47 48#ifdef HAVE_FCNTL_H 49# include <fcntl.h> 50#endif 51 52/// This function builds an error message into \p ErrMsg using the \p prefix 53/// string and the Unix error number given by \p errnum. If errnum is -1, the 54/// default then the value of errno is used. 55/// Make an error message 56/// 57/// If the error number can be converted to a string, it will be 58/// separated from prefix by ": ". 59static inline bool MakeErrMsg( 60 std::string* ErrMsg, const std::string& prefix, int errnum = -1) { 61 if (!ErrMsg) 62 return true; 63 if (errnum == -1) 64 errnum = errno; 65 *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum); 66 return true; 67} 68 69// Include StrError(errnum) in a fatal error message. 70[[noreturn]] static inline void ReportErrnumFatal(const char *Msg, int errnum) { 71 std::string ErrMsg; 72 MakeErrMsg(&ErrMsg, Msg, errnum); 73 llvm::report_fatal_error(llvm::Twine(ErrMsg)); 74} 75 76namespace llvm { 77namespace sys { 78 79/// Convert a struct timeval to a duration. Note that timeval can be used both 80/// as a time point and a duration. Be sure to check what the input represents. 81inline std::chrono::microseconds toDuration(const struct timeval &TV) { 82 return std::chrono::seconds(TV.tv_sec) + 83 std::chrono::microseconds(TV.tv_usec); 84} 85 86/// Convert a time point to struct timespec. 87inline struct timespec toTimeSpec(TimePoint<> TP) { 88 using namespace std::chrono; 89 90 struct timespec RetVal; 91 RetVal.tv_sec = toTimeT(TP); 92 RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count(); 93 return RetVal; 94} 95 96/// Convert a time point to struct timeval. 97inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) { 98 using namespace std::chrono; 99 100 struct timeval RetVal; 101 RetVal.tv_sec = toTimeT(TP); 102 RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count(); 103 return RetVal; 104} 105 106} // namespace sys 107} // namespace llvm 108 109#endif 110