lib/Support/Unix/Unix.h

   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 <algorithm>
  25 #include <assert.h>
  26 #include <cerrno>
  27 #include <cstdio>
  28 #include <cstdlib>
  29 #include <cstring>
  30 #include <string>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33
  34 #ifdef HAVE_UNISTD_H
  35 #include <unistd.h>
  36 #endif
  37
  38 #ifdef HAVE_SYS_PARAM_H
  39 #include <sys/param.h>
  40 #endif
  41
  42 #ifdef HAVE_SYS_TIME_H
  43 # include <sys/time.h>
  44 #endif
  45 #include <time.h>
  46
  47 #ifdef HAVE_DLFCN_H
  48 # include <dlfcn.h>
  49 #endif
  50
  51 #ifdef HAVE_FCNTL_H
  52 # include <fcntl.h>
  53 #endif
  54
  55 /// This function builds an error message into \p ErrMsg using the \p prefix
  56 /// string and the Unix error number given by \p errnum. If errnum is -1, the
  57 /// default then the value of errno is used.
  58 /// Make an error message
  59 ///
  60 /// If the error number can be converted to a string, it will be
  61 /// separated from prefix by ": ".
  62 static inline bool MakeErrMsg(
  63   std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
  64   if (!ErrMsg)
  65     return true;
  66   if (errnum == -1)
  67     errnum = errno;
  68   *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
  69   return true;
  70 }
  71
  72 namespace llvm {
  73 namespace sys {
  74
  75 /// Convert a struct timeval to a duration. Note that timeval can be used both
  76 /// as a time point and a duration. Be sure to check what the input represents.
  77 inline std::chrono::microseconds toDuration(const struct timeval &TV) {
  78   return std::chrono::seconds(TV.tv_sec) +
  79          std::chrono::microseconds(TV.tv_usec);
  80 }
  81
  82 /// Convert a time point to struct timespec.
  83 inline struct timespec toTimeSpec(TimePoint<> TP) {
  84   using namespace std::chrono;
  85
  86   struct timespec RetVal;
  87   RetVal.tv_sec = toTimeT(TP);
  88   RetVal.tv_nsec = (TP.time_since_epoch() % seconds(1)).count();
  89   return RetVal;
  90 }
  91
  92 /// Convert a time point to struct timeval.
  93 inline struct timeval toTimeVal(TimePoint<std::chrono::microseconds> TP) {
  94   using namespace std::chrono;
  95
  96   struct timeval RetVal;
  97   RetVal.tv_sec = toTimeT(TP);
  98   RetVal.tv_usec = (TP.time_since_epoch() % seconds(1)).count();
  99   return RetVal;
 100 }
 101
 102 } // namespace sys
 103 } // namespace llvm
 104
 105 #endif