LLVM  3.7.0
Unix/TimeValue.inc
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1 //===- Unix/TimeValue.cpp - Unix TimeValue Implementation -------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Unix specific portion of the TimeValue class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic UNIX code that
16 //=== is guaranteed to work on *all* UNIX variants.
17 //===----------------------------------------------------------------------===//
18 
19 #include "Unix.h"
20 
21 namespace llvm {
22  using namespace sys;
23 
24 std::string TimeValue::str() const {
25  time_t OurTime = time_t(this->toEpochTime());
26  struct tm Storage;
27  struct tm *LT = ::localtime_r(&OurTime, &Storage);
28  assert(LT);
29  char Buffer1[sizeof("YYYY-MM-DD HH:MM:SS")];
30  strftime(Buffer1, sizeof(Buffer1), "%Y-%m-%d %H:%M:%S", LT);
31  char Buffer2[sizeof("YYYY-MM-DD HH:MM:SS.MMMUUUNNN")];
32  snprintf(Buffer2, sizeof(Buffer2), "%s.%.9u", Buffer1, this->nanoseconds());
33  return std::string(Buffer2);
34 }
35 
36 TimeValue TimeValue::now() {
37  struct timeval the_time;
38  timerclear(&the_time);
39  if (0 != ::gettimeofday(&the_time,nullptr)) {
40  // This is *really* unlikely to occur because the only gettimeofday
41  // errors concern the timezone parameter which we're passing in as 0.
42  // In the unlikely case it does happen, just return MinTime, no error
43  // message needed.
44  return MinTime();
45  }
46 
47  return TimeValue(
48  static_cast<TimeValue::SecondsType>( the_time.tv_sec +
49  PosixZeroTimeSeconds ),
50  static_cast<TimeValue::NanoSecondsType>( the_time.tv_usec *
52 }
53 
54 }
std::string str() const
Provides conversion of the TimeValue into a readable time & date.
TimeValue()
Default construct a time value, initializing to ZeroTime.
Definition: TimeValue.h:95
static TimeValue now()
This is a static constructor that returns a TimeValue that represents the current time...
static TimeValue MinTime()
A constant TimeValue representing the smallest time value permissible by the class.
Definition: TimeValue.h:41
NanoSecondsType nanoseconds() const
Returns only the nanoseconds component of the TimeValue.
Definition: TimeValue.h:212
uint64_t toEpochTime() const
Converts the TimeValue into the corresponding number of seconds since the epoch (00:00:00 Jan 1...
Definition: TimeValue.h:250