/src/CMake/Source/cmStdIoInit.cxx
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1 | | /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
2 | | file LICENSE.rst or https://cmake.org/licensing for details. */ |
3 | | #include "cmStdIoInit.h" |
4 | | |
5 | | #include <cerrno> |
6 | | #include <cstdio> |
7 | | #include <cstdlib> |
8 | | #include <iostream> |
9 | | |
10 | | #include <fcntl.h> |
11 | | |
12 | | #ifdef _WIN32 |
13 | | # include <windows.h> |
14 | | |
15 | | # include <io.h> // for _close, _dup2, _get_osfhandle |
16 | | |
17 | | # include "cm_fileno.hxx" |
18 | | #else |
19 | | # include <unistd.h> |
20 | | #endif |
21 | | |
22 | | #include "cmStdIoStream.h" |
23 | | |
24 | | namespace cm { |
25 | | namespace StdIo { |
26 | | |
27 | | namespace { |
28 | | |
29 | | #ifdef _WIN32 |
30 | | void InitStdPipe(int stdFd, DWORD nStdHandle, FILE* stream, |
31 | | wchar_t const* mode) |
32 | | { |
33 | | if (cm_fileno(stream) >= 0) { |
34 | | return; |
35 | | } |
36 | | _close(stdFd); |
37 | | _wfreopen(L"NUL", mode, stream); |
38 | | int fd = cm_fileno(stream); |
39 | | if (fd < 0) { |
40 | | perror("failed to open NUL for missing stdio pipe"); |
41 | | abort(); |
42 | | } |
43 | | if (fd != stdFd) { |
44 | | _dup2(fd, stdFd); |
45 | | } |
46 | | SetStdHandle(nStdHandle, reinterpret_cast<HANDLE>(_get_osfhandle(fd))); |
47 | | } |
48 | | #else |
49 | | void InitStdPipe(int fd) |
50 | 0 | { |
51 | 0 | if (fcntl(fd, F_GETFD) != -1 || errno != EBADF) { |
52 | 0 | return; |
53 | 0 | } |
54 | | |
55 | 0 | int f = open("/dev/null", fd == STDIN_FILENO ? O_RDONLY : O_WRONLY); |
56 | 0 | if (f == -1) { |
57 | 0 | perror("failed to open /dev/null for missing stdio pipe"); |
58 | 0 | abort(); |
59 | 0 | } |
60 | 0 | if (f != fd) { |
61 | 0 | dup2(f, fd); |
62 | 0 | close(f); |
63 | 0 | } |
64 | 0 | } |
65 | | #endif |
66 | | |
67 | | struct InitStdPipes |
68 | | { |
69 | | InitStdPipes() |
70 | 0 | { |
71 | | #ifdef _WIN32 |
72 | | InitStdPipe(0, STD_INPUT_HANDLE, stdin, L"rb"); |
73 | | InitStdPipe(1, STD_OUTPUT_HANDLE, stdout, L"wb"); |
74 | | InitStdPipe(2, STD_ERROR_HANDLE, stderr, L"wb"); |
75 | | #else |
76 | 0 | InitStdPipe(STDIN_FILENO); |
77 | 0 | InitStdPipe(STDOUT_FILENO); |
78 | 0 | InitStdPipe(STDERR_FILENO); |
79 | 0 | #endif |
80 | 0 | } |
81 | | }; |
82 | | |
83 | | } // anonymous namespace |
84 | | |
85 | | class Globals |
86 | | { |
87 | | public: |
88 | | std::ios::Init InitIos; |
89 | | InitStdPipes InitPipes; |
90 | | IStream StdIn{ std::cin, stdin }; |
91 | | OStream StdOut{ std::cout, stdout }; |
92 | | OStream StdErr{ std::cerr, stderr }; |
93 | | |
94 | | Globals(); |
95 | | |
96 | | #ifdef _WIN32 |
97 | | static BOOL WINAPI CtrlHandler(DWORD /*dwCtrlType*/) |
98 | | { |
99 | | Get().StdErr.Destroy(); |
100 | | Get().StdOut.Destroy(); |
101 | | Get().StdIn.Destroy(); |
102 | | return FALSE; |
103 | | } |
104 | | #endif |
105 | | |
106 | | static Globals& Get(); |
107 | | }; |
108 | | |
109 | | #ifdef _WIN32 |
110 | | Globals::Globals() |
111 | | { |
112 | | SetConsoleCtrlHandler(CtrlHandler, TRUE); |
113 | | } |
114 | | #else |
115 | 0 | Globals::Globals() = default; |
116 | | #endif |
117 | | |
118 | | Globals& Globals::Get() |
119 | 0 | { |
120 | 0 | static Globals globals; |
121 | 0 | return globals; |
122 | 0 | } |
123 | | |
124 | | Init::Init() |
125 | 0 | { |
126 | 0 | Globals::Get(); |
127 | 0 | } |
128 | | |
129 | | IStream& In() |
130 | 0 | { |
131 | 0 | return Globals::Get().StdIn; |
132 | 0 | } |
133 | | |
134 | | OStream& Out() |
135 | 0 | { |
136 | 0 | return Globals::Get().StdOut; |
137 | 0 | } |
138 | | |
139 | | OStream& Err() |
140 | 0 | { |
141 | 0 | return Globals::Get().StdErr; |
142 | 0 | } |
143 | | |
144 | | } |
145 | | } |