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annotate dep/animia/src/util/osx.cc @ 165:8937fb7f2d66

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dep/animia/osx: that's not how std::string works
author Paper <mrpapersonic@gmail.com>
date Sat, 18 Nov 2023 01:12:02 -0500
parents 44c5e6dd9488
children e44b7c428d7c
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1 #include "animia/util/osx.h"
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2
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3 #ifdef HAVE_COREFOUNDATION
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4 #include <CoreFoundation/CoreFoundation.h>
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5 #endif
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6
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7 namespace animia::internal::osx::util {
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8
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9 #ifdef HAVE_COREFOUNDATION
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10 /* All of these LaunchServices things use *internal functions* that are subject
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11 ** to change. Granted, it's not very likely that these will change very much
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12 ** because I'm fairly sure Apple uses them lots in their own internal code.
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13 */
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14
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15 /* from RDProcess */
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16 typedef CFTypeRef (*LSASNCreateWithPidSpec)(CFAllocatorRef, pid_t);
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17 typedef CFDictionaryRef (*LSCopyApplicationInformationSpec)(int, CFTypeRef, CFArrayRef);
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18
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19 static LSCopyApplicationInformationSpec LSCopyApplicationInformation = nullptr;
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20 static LSASNCreateWithPidSpec LSASNCreateWithPid = nullptr;
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21
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22 /* retrieved from LaunchServicesSPI.h in WebKit */
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23 static constexpr int kLSDefaultSessionID = -2;
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24 static const CFStringRef kLaunchServicesBundleID = CFSTR("com.apple.LaunchServices");
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26 /* retrieved dynamically */
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27 static CFStringRef kLSDisplayNameKey = nullptr;
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28 static CFStringRef kLSPIDKey = nullptr;
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29
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30 static bool GetLaunchServicesPrivateSymbols() {
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31 CFBundleRef launch_services_bundle = CFBundleGetBundleWithIdentifier(kLaunchServicesBundleID);
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32 if (!launch_services_bundle)
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33 return false;
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35 LSCopyApplicationInformation = (LSCopyApplicationInformationSpec)CFBundleGetFunctionPointerForName(launch_services_bundle, CFSTR("_LSCopyApplicationInformation"));
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36 if (!LSCopyApplicationInformation)
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37 return false;
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38
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39 LSASNCreateWithPid = (LSASNCreateWithPidSpec)CFBundleGetFunctionPointerForName(launch_services_bundle, CFSTR("_LSASNCreateWithPid"));
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40 if (!LSASNCreateWithPid)
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41 return false;
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42
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43 kLSDisplayNameKey = *(CFStringRef*)CFBundleGetDataPointerForName(launch_services_bundle, CFSTR("_kLSDisplayNameKey"));
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44 if (!kLSDisplayNameKey)
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45 return false;
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46
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47 kLSPIDKey = *(CFStringRef*)CFBundleGetDataPointerForName(launch_services_bundle, CFSTR("_kLSPIDKey"));
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48 if (!kLSPIDKey)
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49 return false;
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50
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51 return true;
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52 }
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53
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54 static bool LaunchServicesGetProcessName(pid_t pid, std::string& result) {
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55 if (!LSCopyApplicationInformation || !LSASNCreateWithPid)
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56 if (!GetLaunchServicesPrivateSymbols())
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57 return false;
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58
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59 CFTypeRef asn = LSASNCreateWithPid(kCFAllocatorDefault, pid);
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60
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61 CFArrayRef request_array = CFArrayCreate(NULL, (const void **)kLSDisplayNameKey, 1, NULL);
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62
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63 CFDictionaryRef dictionary = LSCopyApplicationInformation(kLaunchServicesMagicConstant, asn, request_array);
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64
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65 CFRelease(request_array);
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66 if (!dictionary)
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67 return false;
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68
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69 CFStringRef str;
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70 if (!CFDictionaryGetValueIfPresent(dictionary, kLSDisplayNameKey, (CFTypeRef*)&str) || !str) {
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71 CFRelease(dictionary);
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72 return false;
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73 }
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74 CFRetain(str);
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75
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76 CFRelease(dictionary);
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77
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78 result.reserve(CFStringGetMaximumSizeForEncoding(CFStringGetLength(str), kCFStringEncodingUTF8) + 1);
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79
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80 if (!CFStringGetCString(str, &result.front(), result.length(), result.length())) {
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81 CFRelease(str);
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82 return false;
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83 }
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84
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85 CFRelease(str);
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86
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87 return true;
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88 }
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89 #endif // HAVE_COREFOUNDATION
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90
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91 static bool GetProcessArgs(pid_t pid, std::string& args) {
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92 /* sysctl shouldn't touch these, so we define them as const */
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93 const int mib[3] = {CTL_KERN, KERN_PROCARGS2, static_cast<int>(pid)};
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94 const size_t mib_size = sizeof(mib)/sizeof(*mib);
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95
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96 /* Get the initial size of the array */
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97 size_t size;
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98 {
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99 int ret = sysctl((int*)mib, mib_size, nullptr, &size, nullptr, 0);
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100 if (ret)
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101 return false;
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102 }
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103
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104 /* Reserve the space for it in args */
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105 args.resize(size);
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106
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107 /* Get the contents of argc and argv */
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108 {
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109 int ret = sysctl((int*)mib, mib_size, &args.front(), &size, NULL, 0);
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110 if (ret)
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111 return false;
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112 }
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113
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114 /* Is the size big enough to hold at least argc? */
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115 if (size < sizeof(int))
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116 return false;
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117
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118 args.resize(size);
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119 }
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120
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121 static bool GetProcessNameFromArgs(pid_t pid, std::string& result) {
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122 if (!GetProcessArgs(pid, result))
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123 return false;
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124
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125 /* Get argc using memcpy */
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126 int argc;
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127 memcpy(&argc, &args.front(), sizeof(argc));
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128
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129 /* Do we even have argv[0]? */
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130 if (argc < 1)
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131 return false;
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132
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133 /* Find the first null character */
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134 size_t null_pos = args.find('\0', sizeof(argc));
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135 if (null_pos == std::string::npos)
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136 return false;
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137
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138 /* Find the last slash */
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139 size_t last_slash = args.rfind('/', null_pos);
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140 if (last_slash == std::string::npos)
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141 return false;
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142
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143 /* Return our result */
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144 result = args.substr(last_slash + 1, null_pos - last_slash - 1);
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145 return true;
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146 }
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147
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148 static bool GetProcessNameFromKernel(pid_t pid, std::string& result) {
165
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149 result.resize(2 * MAXCOMLEN);
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150
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151 int size = proc_name(pid, &result.front(), result.length());
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152 if (!size)
163
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153 return false;
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154
165
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155 result.resize(size);
163
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156 return true;
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157 }
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158
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159 static bool GetProcessName(pid_t pid, std::string& result) {
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160 #ifdef HAVE_COREFOUNDATION
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161 if (LaunchServicesGetProcessName(pid, result))
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162 return true;
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163 #endif // HAVE_COREFOUNDATION
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164
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165 /* Try parsing the arguments, this prevents the process name being
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166 cut off to 2*MAXCOMLEN (32 chars) */
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167 if (GetProcessNameFromArgs(pid, result))
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168 return true;
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169
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170 /* Then attempt getting it from the kernel, which results in the
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171 process name being cut to 32 chars (worse, 16 chars if p_name is
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172 unavailable) */
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173 if (GetProcessNameFromKernel(pid, result))
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174 return true;
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175
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176 return false;
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177 }
162
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178
61b76c7b656a dep/animia: add os x launchservices method
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179 }