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annotate dep/animia/src/fd/linux.cc @ 140:1e696863b54c

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dep/animia: remove superfluous includes #include <windows.h> in the main file LMFAO
author Paper <mrpapersonic@gmail.com>
date Sun, 12 Nov 2023 16:54:58 -0500
parents 478f3b366199
children 4e750f6545cf
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140
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1 #include "animia/util.h"
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2
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3 #include <algorithm>
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4 #include <filesystem>
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5 #include <fstream>
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6 #include <iostream>
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7 #include <sstream>
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8 #include <string>
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9 #include <unordered_map>
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10 #include <vector>
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11 #include <cstring>
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12
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13 #include <fcntl.h>
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14 #include <dirent.h>
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15 #include <sys/stat.h>
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16 #include <unistd.h>
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17
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18 #define PROC_LOCATION "/proc"
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19
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20 namespace animia::internal::linux {
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21
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22 /* this uses dirent instead of std::filesystem; it would make a bit
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23 more sense to use the latter, but this is platform dependent already :) */
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24 std::vector<std::string> GetAllFilesInDir(const std::string& _dir) {
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25 std::vector<std::string> ret;
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26
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27 DIR* dir = opendir(_dir.c_str());
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28 if (!dir)
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29 return ret;
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30
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31 struct dirent* dp;
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32 while ((dp = readdir(dir)) != NULL) {
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33 if (!(!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")))
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34 ret.push_back(_dir + "/" + dp->d_name);
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35 }
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36
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37 closedir(dir);
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38 return ret;
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39 }
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40
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41 std::string Basename(const std::string& path) {
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42 return path.substr(path.find_last_of("/") + 1, path.length());
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43 }
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44
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45 static bool IsRegularFile(std::string link) {
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46 struct stat sb;
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47 if (stat(link.c_str(), &sb) == -1)
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48 return false;
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49 return S_ISREG(sb.st_mode);
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50 }
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51
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52 static bool AreFlagsOk(pid_t pid, int fd) {
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53 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fdinfo/" + std::to_string(fd);
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54 std::stringstream buffer(util::ReadFile(path));
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55
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56 int flags = 0;
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57 for (std::string line; std::getline(buffer, line);) {
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58 /* FIXME: exception handling here!! */
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59 if (line.rfind("flags:", 0) == 0) {
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60 flags = std::stoi(line.substr(line.find_last_not_of("0123456789") + 1));
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61 }
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62 }
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63 if (flags & O_WRONLY || flags & O_RDWR)
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64 return false;
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65 return true;
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66 }
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67
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68 static std::string GetFilenameFromFd(std::string link) {
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69 /* gets around stupid linux limitation where /proc doesn't
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70 give actual filesize readings */
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71 size_t exe_size = 1024;
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72 ssize_t exe_used;
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73 std::string ret;
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74
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75 while (1) {
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76 ret = std::string(exe_size, '\0');
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77 exe_used = readlink(link.c_str(), &ret.front(), ret.length());
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78 if (exe_used == (ssize_t)-1)
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79 return NULL;
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80
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81 if (exe_used < (ssize_t)1) {
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82 errno = ENOENT;
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83 return NULL;
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84 }
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85
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86 if (exe_used < (ssize_t)(exe_size - 1))
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87 break;
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88
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89 exe_size += 1024;
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90 }
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91
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92 return ret.c_str();
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93 }
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94
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95 bool LinuxFdTools::GetAllPids(std::set<pid_t>& pids) {
138
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96 for (const auto& dir : get_all_files_in_dir(PROC_LOCATION)) {
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97 pid_t pid;
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98 try {
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99 pid = std::stoul(basename(dir));
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100 } catch (std::invalid_argument) {
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101 continue;
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102 }
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103 pids.push_back(pid);
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104 }
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105 }
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106
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107 bool LinuxFdTools::GetProcessName(pid_t pid, std::string& result) {
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108 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/comm";
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109
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110 std::string result = util::ReadFile(path);
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111 result.erase(std::remove(result.begin(), result.end(), '\n'), result.end());
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112 }
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113
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114 bool LinuxFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, std::vector<std::tuple<pid_t, std::string>>& files) {
138
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115 for (const auto& pid : pids) {
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116 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fd";
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117
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118 for (const auto& dir : GetAllFilesInDir(path)) {
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119 if (!AreFlagsOk(pid, std::stoi(basename(dir))))
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120 continue;
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121
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122 std::string name = GetFilenameFromFd(dir);
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123
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124 if (!IsRegularFile(name))
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125 continue;
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126
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127 files.push_back({pid, name});
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128 }
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129 }
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130 return true;
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131 }
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132
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133 } // namespace animia::internal::linux