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annotate dep/animia/src/fd/proc.cc @ 201:8f6f8dd2eb23

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dep/animia: finish kvm backend dep/animia: cmake: don't use kvm on unsupported systems, use private and public includes properly cmake: why are we defining target include directories twice?
author paper@DavesDouble.local
date Sun, 19 Nov 2023 19:13:28 -0500
parents 54c5d80a737e
children 5be17d636aee
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1 #include "animia/fd/proc.h"
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2 #include "animia.h"
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3 #include "animia/util.h"
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4
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5 #include <algorithm>
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6 #include <cstring>
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7 #include <filesystem>
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8 #include <fstream>
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9 #include <sstream>
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10 #include <string>
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11 #include <unordered_map>
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12 #include <vector>
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13
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14 #include <dirent.h>
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15 #include <fcntl.h>
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16 #include <sys/stat.h>
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17 #include <unistd.h>
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18
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19 #ifdef FREEBSD
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20 # include <sys/types.h>
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21 # include <sys/user.h>
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22 # include <libutil.h>
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23 #endif
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24
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25 #define PROC_LOCATION "/proc"
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26
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27 namespace animia::internal::proc {
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28
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29 /* this uses dirent instead of std::filesystem; it would make a bit
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30 more sense to use the latter, but this is platform dependent already :) */
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31 static std::vector<std::string> GetAllFilesInDir(const std::string& _dir) {
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32 std::vector<std::string> ret;
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33
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34 DIR* dir = opendir(_dir.c_str());
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35 if (!dir)
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36 return ret;
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37
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38 struct dirent* dp;
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39 while ((dp = readdir(dir)) != NULL) {
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40 if (!(!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")))
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41 ret.push_back(_dir + "/" + dp->d_name);
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42 }
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43
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44 closedir(dir);
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45 return ret;
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46 }
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47
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48 static std::string Basename(const std::string& path) {
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49 return path.substr(path.find_last_of("/") + 1, path.length());
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50 }
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51
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52 static bool IsRegularFile(std::string link) {
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53 struct stat sb;
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54 if (stat(link.c_str(), &sb) == -1)
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55 return false;
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56 return S_ISREG(sb.st_mode);
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57 }
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58
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59 static bool AreFlagsOk(pid_t pid, int fd) {
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60 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fdinfo/" + std::to_string(fd);
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61
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62 std::ifstream file(path.c_str());
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63 if (!file)
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64 return false;
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65
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66 int flags = 0;
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67 for (std::string line; std::getline(file, line); )
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68 if (line.find("flags:", 0) == 0)
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69 flags = std::stoi(line.substr(line.find_last_not_of("0123456789") + 1));
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70
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71 if (flags & O_WRONLY || flags & O_RDWR)
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72 return false;
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73 return true;
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74 }
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75
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76 static bool GetFilenameFromFd(std::string link, std::string& out) {
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77 /* gets around stupid linux limitation where /proc doesn't
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78 give actual filesize readings */
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79 constexpr size_t OUT_MAX = (1 << 15); // 32KiB
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80 out.resize(1024);
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81
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82 for (ssize_t exe_used = 0;
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83 out.length() < OUT_MAX && exe_used >= (ssize_t)(out.length() - 1);
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84 out.resize(out.length() * 2)) {
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85 exe_used = readlink(link.c_str(), &out.front(), out.length());
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86 if (exe_used == (ssize_t)-1 || exe_used < (ssize_t)1)
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87 return false;
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88 }
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89 }
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90
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91 static std::string GetProcessName(pid_t pid) {
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92 std::string result;
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93
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94 #ifdef FREEBSD
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95 struct kinfo_proc* proc = kinfo_getproc(pid);
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96 if (!proc)
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97 return "";
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98 result = proc->ki_comm;
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99 free(proc);
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100 #elif defined(LINUX)
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101 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/comm";
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102
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103 if (!util::ReadFile(path, result))
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104 return "";
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105
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106 result.erase(std::remove(result.begin(), result.end(), '\n'), result.end());
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107 #endif
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108
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109 return result;
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110 }
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111
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112 bool ProcFdTools::EnumerateOpenProcesses(process_proc_t process_proc) {
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113 bool success = false;
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114 for (const auto& dir : GetAllFilesInDir(PROC_LOCATION)) {
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115 pid_t pid;
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116 try {
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117 pid = std::stoul(Basename(dir));
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118 success = true;
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119 } catch (std::invalid_argument) {
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120 continue;
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121 }
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122 if (!process_proc({pid, GetProcessName(pid)}))
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123 return false;
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124 }
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125 return success;
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126 }
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127
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128 bool ProcFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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129 if (!open_file_proc)
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130 return false;
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131
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132 for (const auto& pid : pids) {
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133 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fd";
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134
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135 for (const auto& dir : GetAllFilesInDir(path)) {
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136 if (!AreFlagsOk(pid, std::stoi(Basename(dir))))
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137 continue;
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138
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139 std::string name = GetFilenameFromFd(dir);
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140
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141 if (!IsRegularFile(name))
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142 continue;
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143
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144 if (!open_file_proc({pid, name}))
8700806c2cc2 dep/animia: awesome new breaking changes!
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145 return false;
138
28842a8d0c6b dep/animia: huge refactor (again...)
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146 }
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147 }
28842a8d0c6b dep/animia: huge refactor (again...)
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148 return true;
28842a8d0c6b dep/animia: huge refactor (again...)
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149 }
28842a8d0c6b dep/animia: huge refactor (again...)
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150
28842a8d0c6b dep/animia: huge refactor (again...)
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151 } // namespace animia::internal::linux