Mercurial > libanimone
annotate src/fd/bsd.cc @ 9:fac204fb3748
dep/animone: x11: correctly check for connection failure
if there's no X server running then the previous code segfaults(!)
| author | Paper <paper@paper.us.eu.org> |
|---|---|
| date | Mon, 22 Apr 2024 19:11:06 -0400 |
| parents | f26b08274dcf |
| children | 52927e5118f9 |
| rev | line source |
|---|---|
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1 #include "animone/fd/bsd.h" |
| 0 | 2 #include "animone.h" |
| 3 #include "animone/fd.h" | |
| 4 | |
| 5 #include <sys/file.h> | |
| 6 #include <sys/filedesc.h> | |
| 7 #include <sys/param.h> | |
| 8 #include <sys/queue.h> | |
| 9 #include <sys/sysctl.h> | |
| 10 #include <sys/types.h> | |
| 11 #include <sys/user.h> | |
| 12 #include <sys/vnode.h> | |
| 13 | |
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14 #ifdef HAVE_KVM_GETFILES |
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15 # include <kvm.h> |
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16 # include <fts.h> |
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17 #elif defined(LIBUTIL) |
| 0 | 18 # include <libutil.h> |
| 19 #endif | |
| 20 | |
| 21 #include <string> | |
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22 #include <iostream> |
| 0 | 23 |
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24 namespace animone::internal::bsd { |
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25 |
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26 static std::string Basename(const std::string& name) { |
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27 size_t s = name.find_last_of('/'); |
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28 |
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29 if (s == std::string::npos) |
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30 return name; |
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31 |
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32 return name.substr(s, name.size()); |
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33 } |
| 0 | 34 |
| 35 bool GetProcessName(pid_t pid, std::string& name) { | |
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36 #ifdef HAVE_KVM_GETFILES |
| 0 | 37 char errbuf[_POSIX2_LINE_MAX]; |
| 38 kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf); | |
| 39 if (!kernel) | |
| 40 return false; | |
| 41 | |
| 42 int entries = 0; | |
| 43 struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_PID, pid, &entries); | |
| 44 if (!kinfo) { | |
| 45 kvm_close(kernel); | |
| 46 return false; | |
| 47 } | |
| 48 | |
| 49 if (entries < 1) { | |
| 50 kvm_close(kernel); | |
| 51 return false; | |
| 52 } | |
| 53 | |
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54 name = Basename(kinfo[0].ki_paddr->p_comm); |
| 0 | 55 |
| 56 return true; | |
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57 #else |
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58 /* use sysctl as a fallback */ |
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59 static const int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, pid}; |
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60 |
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61 struct kinfo_proc result; |
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62 |
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63 size_t length = 1; |
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64 if (sysctl((int*)mib, (sizeof(mib) / sizeof(*mib)) - 1, &result, &length, NULL, 0) == -1) |
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65 return false; |
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66 |
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67 name = Basename(result.ki_comm); |
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68 |
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69 return true; |
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70 #endif |
| 0 | 71 } |
| 72 | |
| 73 /* Most of the BSDs share the common kvm library, | |
| 74 * so accessing this information can be trivial. | |
| 75 */ | |
| 76 bool EnumerateOpenProcesses(process_proc_t process_proc) { | |
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77 #ifdef HAVE_KVM_GETFILES |
| 0 | 78 char errbuf[_POSIX2_LINE_MAX]; |
| 79 kvm_t* kernel = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf); | |
| 80 if (!kernel) | |
| 81 return false; | |
| 82 | |
| 83 int entries = 0; | |
| 84 struct kinfo_proc* kinfo = kvm_getprocs(kernel, KERN_PROC_ALL, 0, &entries); | |
| 85 if (!kinfo) { | |
| 86 kvm_close(kernel); | |
| 87 return false; | |
| 88 } | |
| 89 | |
| 90 for (int i = 0; i < entries; i++) { | |
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91 if (!process_proc({kinfo[i].ki_paddr->p_pid, Basename(kinfo[i].ki_paddr->p_comm)})) { |
| 0 | 92 kvm_close(kernel); |
| 93 return false; | |
| 94 } | |
| 95 } | |
| 96 | |
| 97 kvm_close(kernel); | |
| 98 | |
| 99 return true; | |
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100 #else |
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101 /* use sysctl as a fallback */ |
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102 static const int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0}; |
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103 size_t length = 0; |
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104 |
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105 sysctl((int*)mib, (sizeof(mib) / sizeof(*mib)) - 1, NULL, &length, NULL, 0); |
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106 |
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107 std::unique_ptr<struct kinfo_proc[]> result; |
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108 result.reset(new struct kinfo_proc[length]); |
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109 |
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110 if (!result.get()) |
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111 return false; |
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112 |
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113 /* actually get our results */ |
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114 if (sysctl((const int*)mib, (sizeof(mib) / sizeof(*mib)) - 1, result.get(), &length, NULL, 0) == ENOMEM) |
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115 return false; |
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116 |
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117 if (length < sizeof(struct kinfo_proc)) |
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118 return false; |
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119 |
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120 for (int i = 0; i < length / sizeof(result[0]); i++) |
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121 if (!process_proc({result[i].ki_pid, result[i].ki_comm})) |
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122 return false; |
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123 |
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124 return true; |
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125 #endif |
| 0 | 126 } |
| 127 | |
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128 #ifdef HAVE_KVM_GETFILES |
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129 static bool GetOpenFileName(const struct kinfo_file& file, std::string& name) { |
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130 /* OpenBSD doesn't provide a native API for this, so we have |
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131 * to do it ourselves */ |
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132 static constexpr std::string_view root = "/"; |
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133 |
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134 FTS* file_system = fts_open(root.data(), FTS_COMFOLLOW | FTS_NOCHDIR, nullptr); |
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135 if (!file_system) |
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136 return false; |
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137 |
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138 /* Search through the filesystem for a file that matches our |
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139 * kinfo_file structure */ |
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140 FTSENT* parent = nullptr; |
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141 while ((parent = fts_read(file_system))) { |
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142 FTSENT* child = fts_children(file_system, 0); |
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143 while (child && child->fts_link) { |
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144 child = child->fts_link; |
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145 if (!S_ISREG(child->fts_statp->st_mode) || !S_ISLNK(child->fts_statp->st_mode)) |
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146 continue; |
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147 |
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148 if (child->fts_statp->st_dev != file->va_fsid) |
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149 continue; |
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150 |
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151 if (child->fts_statp->st_ino != file->va_fileid) |
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152 continue; |
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153 |
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154 name = std::string(child->fts_path) + child->fts_name; |
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155 fts_close(file_system); |
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156 return true; |
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157 } |
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158 } |
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159 |
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160 fts_close(filesystem); |
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161 return false; |
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162 } |
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163 #endif /* HAVE_KVM_GETFILES */ |
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164 |
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165 bool EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) { |
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166 #ifdef HAVE_KVM_GETFILES |
| 0 | 167 char errbuf[_POSIX2_LINE_MAX]; |
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168 kvm_t* kernel = kvm_openfiles(nullptr, nullptr, nullptr, O_RDONLY, errbuf); |
| 0 | 169 if (!kernel) |
| 170 return false; | |
| 171 | |
| 172 for (const auto& pid : pids) { | |
| 173 int cnt; | |
| 174 struct kinfo_file* kfile = kvm_getfiles(kernel, KERN_FILE_BYPID, pid, &cnt); | |
| 175 if (!kfile) { | |
| 176 kvm_close(kernel); | |
| 177 return false; | |
| 178 } | |
| 179 | |
| 180 for (int i = 0; i < cnt; i++) { | |
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181 uint32_t oflags = kfile[i].kf_flags & O_ACCMODE; |
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182 if (oflags == O_WRONLY || oflags == O_RDWR) |
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183 continue; |
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184 |
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185 std::string name; |
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186 if (!GetOpenFileName(kfile[i], name)) |
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187 continue; |
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188 |
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189 if (!open_file_proc({pid, name})) { |
| 0 | 190 kvm_close(kernel); |
| 191 return false; | |
| 192 } | |
| 193 } | |
| 194 } | |
| 195 | |
| 196 kvm_close(kernel); | |
| 197 return true; | |
| 198 #elif defined(LIBUTIL) | |
| 199 for (const auto& pid : pids) { | |
| 200 int cnt; | |
| 201 std::unique_ptr<struct kinfo_file[]> files(kinfo_getfile(pid, &cnt)); | |
| 202 if (!files) | |
| 203 return false; | |
| 204 | |
| 205 for (int i = 0; i < cnt; i++) { | |
| 206 const struct kinfo_file& current = files[i]; | |
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207 if (current.kf_vnode_type != KF_VTYPE_VREG || current.kf_vnode_type != KF_VTYPE_VLNK) |
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208 continue; |
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209 |
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210 const int oflags = current.kf_flags & O_ACCMODE; |
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211 if (oflags == O_WRONLY || oflags == O_RDWR) |
| 0 | 212 continue; |
| 213 | |
| 214 if (!open_file_proc({pid, current.kf_path})) | |
| 215 return false; | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 return true; | |
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220 #else |
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221 /* NetBSD doesn't even provide a real API for this */ |
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222 return false; |
| 0 | 223 #endif |
| 224 } | |
| 225 | |
| 226 } // namespace animone::internal::kvm |