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 <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 HAVE_SYS_TIME_H
48 # include <sys/time.h>
49 #endif
50 #include <time.h>
51 
52 #ifdef HAVE_SYS_WAIT_H
53 # include <sys/wait.h>
54 #endif
55 
56 #ifndef WEXITSTATUS
57 # define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
58 #endif
59 
60 #ifndef WIFEXITED
61 # define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
62 #endif
63 
64 /// This function builds an error message into \p ErrMsg using the \p prefix
65 /// string and the Unix error number given by \p errnum. If errnum is -1, the
66 /// default then the value of errno is used.
67 /// @brief Make an error message
68 ///
69 /// If the error number can be converted to a string, it will be
70 /// separated from prefix by ": ".
71 static inline bool MakeErrMsg(
72   std::string* ErrMsg, const std::string& prefix, int errnum = -1) {
73   if (!ErrMsg)
74     return true;
75   if (errnum == -1)
76     errnum = errno;
77   *ErrMsg = prefix + ": " + llvm::sys::StrError(errnum);
78   return true;
79 }
80 
81 #endif
82