lib/System/Unix/Unix.h

   1 //===- llvm/System/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_SYSTEM_UNIX_UNIX_H
  15 #define LLVM_SYSTEM_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/System/Errno.h"
  24 #include <cstdlib>
  25 #include <cstdio>
  26 #include <cstring>
  27 #include <cerrno>
  28 #include <string>
  29 #include <algorithm>
  30
  31 #ifdef HAVE_UNISTD_H
  32 #include <unistd.h>
  33 #endif
  34
  35 #ifdef HAVE_SYS_TYPES_H
  36 #include <sys/types.h>
  37 #endif
  38
  39 #ifdef HAVE_SYS_PARAM_H
  40 #include <sys/param.h>
  41 #endif
  42
  43 #ifdef HAVE_ASSERT_H
  44 #include <assert.h>
  45 #endif
  46
  47 #ifdef TIME_WITH_SYS_TIME
  48 # include <sys/time.h>
  49 # include <time.h>
  50 #else
  51 # ifdef HAVE_SYS_TIME_H
  52 #  include <sys/time.h>
  53 # else
  54 #  include <time.h>
  55 # endif
  56 #endif
  57
  58 #ifdef HAVE_SYS_WAIT_H
  59 # include <sys/wait.h>
  60 #endif
  61
  62 #ifndef WEXITSTATUS
  63 # define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
  64 #endif
  65
  66 #ifndef WIFEXITED
  67 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
  68 #endif
  69
  70 /// This function builds an error message into \p ErrMsg using the \p prefix
  71 /// string and the Unix error number given by \p errnum. If errnum is -1, the
  72 /// default then the value of errno is used.
  73 /// @brief Make an error message
  74 ///
  75 /// If the error number can be converted to a string, it will be
  76 /// separated from prefix by ": ".
  77 static inline bool MakeErrMsg(
  78   std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
  79   if (!ErrMsg)
  80     return true;
  81   if (errnum == -1)
  82     errnum = errno;
  83   *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
  84   return true;
  85 }
  86
  87 #endif