lib/Support/Unix/Unix.h

   1 //===- llvm/Support/Unix/Unix.h - Common Unix Include File -------*- 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 defines things specific to Unix implementations.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #ifndef LLVM_LIB_SUPPORT_UNIX_UNIX_H
  15 #define LLVM_LIB_SUPPORT_UNIX_UNIX_H
  16
  17 //===----------------------------------------------------------------------===//
  18 //=== WARNING: Implementation here must contain only generic UNIX code that
  19 //===          is guaranteed to work on all UNIX variants.
  20 //===----------------------------------------------------------------------===//
  21
  22 #include "llvm/Config/config.h" // Get autoconf configuration settings
  23 #include "llvm/Support/Chrono.h"
  24 #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_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 namespace llvm {
  74 namespace sys {
  75
  76 /// Convert a struct timeval to a duration. Note that timeval can be used both
  77 /// as a time point and a duration. Be sure to check what the input represents.
  78 inline std::chrono::microseconds toDuration(const struct timeval &TV) {
  79   return std::chrono::seconds(TV.tv_sec) +
  80          std::chrono::microseconds(TV.tv_usec);
  81 }
  82
  83 /// Convert a time point to struct timespec.
  84 inline struct timespec toTimeSpec(TimePoint<> TP) {
  85   using namespace std::chrono;
  86
  87   struct timespec RetVal;
  88   RetVal.tv_sec = toTimeT(TP);
  89   RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
  90   return RetVal;
  91 }
  92
  93 /// Convert a time point to struct timeval.
  94 inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
  95   using namespace std::chrono;
  96
  97   struct timeval RetVal;
  98   RetVal.tv_sec = toTimeT(TP);
  99   RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
 100   return RetVal;
 101 }
 102
 103 } // namespace sys
 104 } // namespace llvm
 105
 106 #endif