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_PARAM_H 40 #include <sys/param.h> 41 #endif 42 43 #ifdef HAVE_SYS_TIME_H 44 # include <sys/time.h> 45 #endif 46 #include <time.h> 47 48 #ifdef HAVE_DLFCN_H 49 # include <dlfcn.h> 50 #endif 51 52 #ifdef HAVE_FCNTL_H 53 # include <fcntl.h> 54 #endif 55 56 /// This function builds an error message into \p ErrMsg using the \p prefix 57 /// string and the Unix error number given by \p errnum. If errnum is -1, the 58 /// default then the value of errno is used. 59 /// Make an error message 60 /// 61 /// If the error number can be converted to a string, it will be 62 /// separated from prefix by ": ". 63 static inline bool MakeErrMsg( 64 std::string* ErrMsg, const std::string& prefix, int errnum = -1) { 65 if (!ErrMsg) 66 return true; 67 if (errnum == -1) 68 errnum = errno; 69 *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum); 70 return true; 71 } 72 73 // Include StrError(errnum) in a fatal error message. 74 LLVM_ATTRIBUTE_NORETURN static inline void ReportErrnumFatal(const char *Msg, 75 int errnum) { 76 std::string ErrMsg; 77 MakeErrMsg(&ErrMsg, Msg, errnum); 78 llvm::report_fatal_error(ErrMsg); 79 } 80 81 namespace llvm { 82 namespace sys { 83 84 /// Convert a struct timeval to a duration. Note that timeval can be used both 85 /// as a time point and a duration. Be sure to check what the input represents. 86 inline std::chrono::microseconds toDuration(const struct timeval &TV) { 87 return std::chrono::seconds(TV.tv_sec) + 88 std::chrono::microseconds(TV.tv_usec); 89 } 90 91 /// Convert a time point to struct timespec. 92 inline struct timespec toTimeSpec(TimePoint<> TP) { 93 using namespace std::chrono; 94 95 struct timespec RetVal; 96 RetVal.tv_sec = toTimeT(TP); 97 RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count(); 98 return RetVal; 99 } 100 101 /// Convert a time point to struct timeval. 102 inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) { 103 using namespace std::chrono; 104 105 struct timeval RetVal; 106 RetVal.tv_sec = toTimeT(TP); 107 RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count(); 108 return RetVal; 109 } 110 111 } // namespace sys 112 } // namespace llvm 113 114 #endif 115