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