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annotate dep/animia/src/fd/linux.cc @ 139:478f3b366199

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dep/animia: separate lots of things, use base class for OS stuff
author Paper <mrpapersonic@gmail.com>
date Sun, 12 Nov 2023 16:43:07 -0500
parents 28842a8d0c6b
children 1e696863b54c
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138
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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 #include <cstring>
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13 #include <dirent.h>
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14
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15 #include "animia/util.h"
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16
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17 #define PROC_LOCATION "/proc"
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18
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19 namespace animia::internal::linux {
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20
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21 /* this uses dirent instead of std::filesystem; it would make a bit
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22 more sense to use the latter, but this is platform dependent already :) */
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23 std::vector<std::string> GetAllFilesInDir(const std::string& _dir) {
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24 std::vector<std::string> ret;
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25
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26 DIR* dir = opendir(_dir.c_str());
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27 if (!dir)
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28 return ret;
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29
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30 struct dirent* dp;
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31 while ((dp = readdir(dir)) != NULL) {
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32 if (!(!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")))
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33 ret.push_back(_dir + "/" + dp->d_name);
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34 }
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35
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36 closedir(dir);
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37 return ret;
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38 }
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39
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40 std::string Basename(const std::string& path) {
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41 return path.substr(path.find_last_of("/") + 1, path.length());
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42 }
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43
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44 static bool IsRegularFile(std::string link) {
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45 struct stat sb;
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46 if (stat(link.c_str(), &sb) == -1)
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47 return false;
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48 return S_ISREG(sb.st_mode);
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49 }
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50
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51 static bool AreFlagsOk(pid_t pid, int fd) {
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52 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fdinfo/" + std::to_string(fd);
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53 std::stringstream buffer(util::ReadFile(path));
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54
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55 int flags = 0;
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56 for (std::string line; std::getline(buffer, line);) {
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57 /* FIXME: exception handling here!! */
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58 if (line.rfind("flags:", 0) == 0) {
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59 flags = std::stoi(line.substr(line.find_last_not_of("0123456789") + 1));
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60 }
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61 }
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62 if (flags & O_WRONLY || flags & O_RDWR)
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63 return false;
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64 return true;
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65 }
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66
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67 static std::string GetFilenameFromFd(std::string link) {
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68 /* gets around stupid linux limitation where /proc doesn't
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69 give actual filesize readings */
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70 size_t exe_size = 1024;
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71 ssize_t exe_used;
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72 std::string ret;
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73
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74 while (1) {
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75 ret = std::string(exe_size, '\0');
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76 exe_used = readlink(link.c_str(), &ret.front(), ret.length());
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77 if (exe_used == (ssize_t)-1)
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78 return NULL;
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79
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80 if (exe_used < (ssize_t)1) {
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81 errno = ENOENT;
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82 return NULL;
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83 }
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84
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85 if (exe_used < (ssize_t)(exe_size - 1))
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86 break;
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87
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88 exe_size += 1024;
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89 }
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90
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91 return ret.c_str();
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92 }
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93
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94 bool LinuxFdTools::GetAllPids(std::set<pid_t>& pids) {
138
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95 for (const auto& dir : get_all_files_in_dir(PROC_LOCATION)) {
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96 pid_t pid;
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97 try {
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98 pid = std::stoul(basename(dir));
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99 } catch (std::invalid_argument) {
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100 continue;
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101 }
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102 pids.push_back(pid);
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103 }
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104 }
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105
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106 bool LinuxFdTools::GetProcessName(pid_t pid, std::string& result) {
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107 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/comm";
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108
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109 std::string result = util::ReadFile(path);
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110 result.erase(std::remove(result.begin(), result.end(), '\n'), result.end());
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111 }
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112
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113 bool LinuxFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, std::vector<std::tuple<pid_t, std::string>>& files) {
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114 for (const auto& pid : pids) {
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115 const std::string path = PROC_LOCATION "/" + std::to_string(pid) + "/fd";
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116
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117 for (const auto& dir : GetAllFilesInDir(path)) {
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118 if (!AreFlagsOk(pid, std::stoi(basename(dir))))
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119 continue;
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120
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121 std::string name = GetFilenameFromFd(dir);
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122
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123 if (!IsRegularFile(name))
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124 continue;
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125
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126 files.push_back({pid, name});
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127 }
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128 }
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129 return true;
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130 }
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131
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132 } // namespace animia::internal::linux