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annotate src/iscygpty.c @ 34627:5071d4c3ff2e v9.1.0202

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patch 9.1.0202: leaking memory in add_user() on failure Commit: https://github.com/vim/vim/commit/7a2f217988afa1c35b9c093a9d3477198ea250b9 Author: Christian Brabandt <cb@256bit.org> Date: Sun Mar 24 09:50:03 2024 +0100 patch 9.1.0202: leaking memory in add_user() on failure Problem: leaking memory in add_user() (LuMingYinDetect) Solution: free user_copy pointer instead of the user ptr add_user() is called with a user pointer and the user pointer comes from these functions: - return value from the getpwent() function (Unix). - return value from the getpwnam() function (Unix). - return value from the NetUserEnum() function (MS Windows). For the first 2 callers, the man page for those functions directly says, one should not free the returned pointer (since it comes from static memory). For the third caller (on MS Windows), the returned buffer is already freed directly after calling the add_user() function in NetApiBufferFree(), so this would lead to a double free(). This all indicates, the user ptr is wrongly freed in the add_user() function and the intention was to free the user_copy pointer instead in case of an error. So let's just use that now. fixes: #14250 closes: #14260 Signed-off-by: Christian Brabandt <cb@256bit.org>
author Christian Brabandt <cb@256bit.org>
date Sun, 24 Mar 2024 10:00:09 +0100
parents 1ffdcd8a424e
children
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1 /*
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2 * iscygpty.c -- part of ptycheck
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3 * https://github.com/k-takata/ptycheck
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4 *
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5 * Copyright (c) 2015-2023 K.Takata
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6 *
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7 * You can redistribute it and/or modify it under the terms of either
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8 * the MIT license (as described below) or the Vim license.
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9 *
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10 * Permission is hereby granted, free of charge, to any person obtaining
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11 * a copy of this software and associated documentation files (the
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12 * "Software"), to deal in the Software without restriction, including
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13 * without limitation the rights to use, copy, modify, merge, publish,
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14 * distribute, sublicense, and/or sell copies of the Software, and to
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15 * permit persons to whom the Software is furnished to do so, subject to
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16 * the following conditions:
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17 *
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18 * The above copyright notice and this permission notice shall be
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19 * included in all copies or substantial portions of the Software.
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20 *
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21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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22 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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23 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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24 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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25 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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26 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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27 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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28 */
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29
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30 #ifdef _WIN32
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31
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32 #include <ctype.h>
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33 #include <io.h>
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34 #include <wchar.h>
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35 #include <windows.h>
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37 #ifdef USE_FILEEXTD
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38 // VC 7.1 or earlier doesn't support SAL.
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39 # if !defined(_MSC_VER) || (_MSC_VER < 1400)
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40 # define __out
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41 # define __in
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42 # define __in_opt
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43 # endif
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44 // Win32 FileID API Library:
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45 // http://www.microsoft.com/en-us/download/details.aspx?id=22599
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46 // Needed for WinXP.
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47 # include <fileextd.h>
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48 #else // USE_FILEEXTD
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49 // VC 8 or earlier.
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50 # if defined(_MSC_VER) && (_MSC_VER < 1500)
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51 # ifdef ENABLE_STUB_IMPL
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52 # define STUB_IMPL
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53 # else
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54 # error "Win32 FileID API Library is required for VC2005 or earlier."
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55 # endif
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56 # endif
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57 #endif // USE_FILEEXTD
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58
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59 #ifdef __MINGW32__
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60 # define UNUSED __attribute__((unused))
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61 #else
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62 # define UNUSED
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63 #endif
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65 #include "iscygpty.h"
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67 //#define USE_DYNFILEID
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68 #ifdef USE_DYNFILEID
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69 typedef BOOL (WINAPI *pfnGetFileInformationByHandleEx)(
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70 HANDLE hFile,
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71 FILE_INFO_BY_HANDLE_CLASS FileInformationClass,
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72 LPVOID lpFileInformation,
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73 DWORD dwBufferSize);
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74 static pfnGetFileInformationByHandleEx pGetFileInformationByHandleEx = NULL;
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76 # ifndef USE_FILEEXTD
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77 static BOOL WINAPI stub_GetFileInformationByHandleEx(
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78 HANDLE hFile UNUSED,
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79 FILE_INFO_BY_HANDLE_CLASS FileInformationClass UNUSED,
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80 LPVOID lpFileInformation UNUSED,
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81 DWORD dwBufferSize UNUSED)
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82 {
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83 return FALSE;
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84 }
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85 # endif
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87 static void setup_fileid_api(void)
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88 {
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89 if (pGetFileInformationByHandleEx != NULL) {
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90 return;
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91 }
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92 pGetFileInformationByHandleEx = (pfnGetFileInformationByHandleEx)
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93 GetProcAddress(GetModuleHandle(TEXT("kernel32.dll")),
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94 "GetFileInformationByHandleEx");
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95 if (pGetFileInformationByHandleEx == NULL) {
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96 # ifdef USE_FILEEXTD
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97 pGetFileInformationByHandleEx = GetFileInformationByHandleEx;
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98 # else
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99 pGetFileInformationByHandleEx = stub_GetFileInformationByHandleEx;
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100 # endif
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101 }
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102 }
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103 #else
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104 # define pGetFileInformationByHandleEx GetFileInformationByHandleEx
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105 # define setup_fileid_api()
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106 #endif
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107
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108
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109 #define is_wprefix(s, prefix) \
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110 (wcsncmp((s), (prefix), sizeof(prefix) / sizeof(WCHAR) - 1) == 0)
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111
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112 // Check if the fd is a cygwin/msys's pty.
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113 int is_cygpty(int fd)
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114 {
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115 #ifdef STUB_IMPL
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116 return 0;
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117 #else
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118 HANDLE h;
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119 const int size = sizeof(FILE_NAME_INFO) + sizeof(WCHAR) * (MAX_PATH - 1);
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120 FILE_NAME_INFO *nameinfo;
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121 WCHAR *p = NULL;
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122
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123 setup_fileid_api();
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124
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125 h = (HANDLE) _get_osfhandle(fd);
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126 if (h == INVALID_HANDLE_VALUE) {
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127 return 0;
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128 }
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129 // Cygwin/msys's pty is a pipe.
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130 if (GetFileType(h) != FILE_TYPE_PIPE) {
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131 return 0;
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132 }
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133 nameinfo = malloc(size + sizeof(WCHAR));
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134 if (nameinfo == NULL) {
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135 return 0;
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136 }
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137 // Check the name of the pipe:
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138 // "\\{cygwin,msys}-XXXXXXXXXXXXXXXX-ptyN-{from,to}-master"
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139 if (pGetFileInformationByHandleEx(h, FileNameInfo, nameinfo, size)) {
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140 nameinfo->FileName[nameinfo->FileNameLength / sizeof(WCHAR)] = L'\0';
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141 p = nameinfo->FileName;
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142 if (is_wprefix(p, L"\\cygwin-")) { // Cygwin
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143 p += 8;
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144 } else if (is_wprefix(p, L"\\msys-")) { // MSYS and MSYS2
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145 p += 6;
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146 } else {
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147 p = NULL;
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148 }
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149 if (p != NULL) {
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150 // Skip 16-digit hexadecimal.
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151 while (*p && iswascii(*p) && isxdigit(*p))
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152 ++p;
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153 if (is_wprefix(p, L"-pty")) {
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154 p += 4;
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155 } else {
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156 p = NULL;
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157 }
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158 }
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159 if (p != NULL) {
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160 // Skip pty number.
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161 while (*p && iswascii(*p) && isdigit(*p))
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162 ++p;
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163 if (is_wprefix(p, L"-from-master")) {
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164 //p += 12;
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165 } else if (is_wprefix(p, L"-to-master")) {
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166 //p += 10;
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167 } else {
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168 p = NULL;
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169 }
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170 }
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171 }
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172 free(nameinfo);
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173 return (p != NULL);
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174 #endif // STUB_IMPL
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175 }
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176
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177 // Check if at least one cygwin/msys pty is used.
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178 int is_cygpty_used(void)
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179 {
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180 int fd, ret = 0;
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181
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182 for (fd = 0; fd < 3; fd++) {
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183 ret |= is_cygpty(fd);
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184 }
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185 return ret;
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186 }
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187
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188 #endif // _WIN32
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189
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190 // vim: set ts=4 sw=4: