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 <algorithm> 25 #include <assert.h> 26 #include <cerrno> 27 #include <cstdio> 28 #include <cstdlib> 29 #include <cstring> 30 #include <string> 31 #include <sys/types.h> 32 #include <sys/wait.h> 33 34 #ifdef HAVE_UNISTD_H 35 #include <unistd.h> 36 #endif 37 38 #ifdef HAVE_SYS_PARAM_H 39 #include <sys/param.h> 40 #endif 41 42 #ifdef HAVE_SYS_TIME_H 43 # include <sys/time.h> 44 #endif 45 #include <time.h> 46 47 #ifdef HAVE_DLFCN_H 48 # include <dlfcn.h> 49 #endif 50 51 #ifdef HAVE_FCNTL_H 52 # include <fcntl.h> 53 #endif 54 55 /// This function builds an error message into \p ErrMsg using the \p prefix 56 /// string and the Unix error number given by \p errnum. If errnum is -1, the 57 /// default then the value of errno is used. 58 /// Make an error message 59 /// 60 /// If the error number can be converted to a string, it will be 61 /// separated from prefix by ": ". 62 static inline bool MakeErrMsg( 63 std::string* ErrMsg, const std::string& prefix, int errnum = -1) { 64 if (!ErrMsg) 65 return true; 66 if (errnum == -1) 67 errnum = errno; 68 *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum); 69 return true; 70 } 71 72 namespace llvm { 73 namespace sys { 74 75 /// Convert a struct timeval to a duration. Note that timeval can be used both 76 /// as a time point and a duration. Be sure to check what the input represents. 77 inline std::chrono::microseconds toDuration(const struct timeval &TV) { 78 return std::chrono::seconds(TV.tv_sec) + 79 std::chrono::microseconds(TV.tv_usec); 80 } 81 82 /// Convert a time point to struct timespec. 83 inline struct timespec toTimeSpec(TimePoint<> TP) { 84 using namespace std::chrono; 85 86 struct timespec RetVal; 87 RetVal.tv_sec = toTimeT(TP); 88 RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count(); 89 return RetVal; 90 } 91 92 /// Convert a time point to struct timeval. 93 inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) { 94 using namespace std::chrono; 95 96 struct timeval RetVal; 97 RetVal.tv_sec = toTimeT(TP); 98 RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count(); 99 return RetVal; 100 } 101 102 } // namespace sys 103 } // namespace llvm 104 105 #endif 106