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      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 /// @brief 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
    107