1 //===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This file defines things specific to Unix implementations.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H
14 #define LLVM_LIB_SUPPORT_UNIX_UNIX_H
16 //===----------------------------------------------------------------------===//
17 //=== WARNING: Implementation here must contain only generic UNIX code that
18 //=== is guaranteed to work on all UNIX variants.
19 //===----------------------------------------------------------------------===//
21 #include "llvm/Config/config.h"
22 #include "llvm/Support/Chrono.h"
23 #include "llvm/Support/Errno.h"
24 #include "llvm/Support/ErrorHandling.h"
32 #include <sys/types.h>
39 #ifdef HAVE_SYS_PARAM_H
40 #include <sys/param.h>
43 #ifdef HAVE_SYS_TIME_H
44 # include <sys/time.h>
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
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) {
69 *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
73 // Include StrError(errnum) in a fatal error message.
74 LLVM_ATTRIBUTE_NORETURN static inline void ReportErrnumFatal(const char *Msg,
77 MakeErrMsg(&ErrMsg, Msg, errnum);
78 llvm::report_fatal_error(ErrMsg);
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);
91 /// Convert a time point to struct timespec.
92 inline struct timespec toTimeSpec(TimePoint<> TP) {
93 using namespace std::chrono;
95 struct timespec RetVal;
96 RetVal.tv_sec = toTimeT(TP);
97 RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
101 /// Convert a time point to struct timeval.
102 inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
103 using namespace std::chrono;
105 struct timeval RetVal;
106 RetVal.tv_sec = toTimeT(TP);
107 RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();