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/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 ": ".
69 static 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