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annotate dep/animia/src/linux.cpp @ 67:442065432549

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author Paper <mrpapersonic@gmail.com>
date Mon, 02 Oct 2023 07:06:44 -0400
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1 #include <algorithm>
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2 #include <fcntl.h>
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3 #include <filesystem>
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4 #include <fstream>
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5 #include <iostream>
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6 #include <sstream>
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7 #include <string>
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8 #include <sys/stat.h>
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9 #include <unistd.h>
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10 #include <unordered_map>
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11 #include <vector>
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12
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13 #define PROC_LOCATION "/proc"
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15 namespace Animia::Linux {
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17 std::vector<int> get_all_pids() {
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18 std::vector<int> ret;
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19 for (const auto& dir : std::filesystem::directory_iterator(PROC_LOCATION)) {
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20 int pid;
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21 try {
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22 pid = std::stoi(dir.path().stem());
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23 } catch (std::invalid_argument) {
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24 continue;
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25 }
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26 ret.push_back(pid);
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27 }
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28 return ret;
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29 }
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31 std::string get_process_name(int pid) {
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32 std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/comm";
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33 std::ifstream t(path);
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34 std::stringstream buf;
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35 buf << t.rdbuf();
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36
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37 std::string str = buf.str();
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38 str.erase(std::remove(str.begin(), str.end(), '\n'), str.end());
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39 return str;
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40 }
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41
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42 static bool is_regular_file(std::string link) {
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43 struct stat sb;
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44 if (stat(link.c_str(), &sb) == -1)
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45 return false;
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46 return S_ISREG(sb.st_mode);
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47 }
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49 static bool are_flags_ok(int pid, int fd) {
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50 std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fdinfo/" + std::to_string(fd);
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51 std::ifstream t(path);
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52 std::stringstream buffer;
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53 buffer << t.rdbuf();
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54 std::string raw;
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55 int flags = 0;
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56 while (std::getline(buffer, raw)) {
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57 if (raw.rfind("flags:", 0) == 0) {
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58 flags = std::stoi(raw.substr(raw.find_last_not_of("0123456789") + 1));
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59 }
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60 }
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61 if (flags & O_WRONLY || flags & O_RDWR)
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62 return false;
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63 return true;
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64 }
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65
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66 static int get_size_of_link(std::string link) {
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67 struct stat sb;
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68 if (lstat(link.c_str(), &sb) == -1)
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69 return -1;
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70 return sb.st_size + 1;
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71 }
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73 std::vector<std::string> get_open_files(int pid) {
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74 std::vector<std::string> ret;
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75 std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fd";
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76 try {
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77 for (const auto& dir : std::filesystem::directory_iterator(path)) {
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78 if (!are_flags_ok(pid, std::stoi(dir.path().stem())))
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79 continue;
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80 /* get filename size */
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81 int size = get_size_of_link(dir.path().string());
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82 /* allocate buffer */
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83 std::string buf(size, '\0');
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84 // std::string buf('\0', size);
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85 /* read filename to buffer */
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86 int r = readlink(dir.path().c_str(), &buf.front(), buf.length());
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87
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88 if (r < 0)
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89 continue;
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90 if (!is_regular_file(buf))
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91 continue;
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92 ret.push_back(buf);
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93 }
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94 } catch (std::filesystem::filesystem_error const& ex) {
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95 if (ex.code().value() != 13) // 13 == permissions error, common with /proc, ignore
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96 throw;
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97 }
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98 return ret;
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99 }
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100
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101 std::unordered_map<int, std::vector<std::string>> get_all_open_files() {
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102 std::unordered_map<int, std::vector<std::string>> map;
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103 std::vector<int> pids = get_all_pids();
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104 for (int i : pids)
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105 map[i] = get_open_files(i);
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106 return map;
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107 }
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108
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109 } // namespace Animia::Linux