LLVM 20.0.0git
Unix.h
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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"
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);
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
static bool MakeErrMsg(std::string *ErrMsg, const std::string &prefix, int errnum=-1)
This function builds an error message into ErrMsg using the prefix string and the Unix error number g...
Definition: Unix.h:59
static void ReportErrnumFatal(const char *Msg, int errnum)
Definition: Unix.h:70
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
std::chrono::nanoseconds toDuration(FILETIME Time)
std::string StrError()
Returns a string representation of the errno value, using whatever thread-safe variant of strerror() ...
std::chrono::time_point< std::chrono::system_clock, D > TimePoint
A time point on the system clock.
Definition: Chrono.h:34
struct timespec toTimeSpec(TimePoint<> TP)
Convert a time point to struct timespec.
Definition: Unix.h:87
struct timeval toTimeVal(TimePoint< std::chrono::microseconds > TP)
Convert a time point to struct timeval.
Definition: Unix.h:97
std::time_t toTimeT(TimePoint<> TP)
Convert a TimePoint to std::time_t.
Definition: Chrono.h:50
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:167
auto count(R &&Range, const E &Element)
Wrapper function around std::count to count the number of times an element Element occurs in the give...
Definition: STLExtras.h:1914
Implement std::hash so that hash_code can be used in STL containers.
Definition: BitVector.h:858