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annotate dep/animia/src/fd/bsd.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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1 /**
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2 * fd/bsd.cpp
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3 * - this ONLY* supports OS X as of now
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4 * (*there is some FreeBSD support code)
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5 **/
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6 #include <unordered_map>
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7 #include <vector>
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8 #include <iostream>
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9 #include <string>
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10
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11 #include <fcntl.h>
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12 #include <sys/sysctl.h>
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13 #include <sys/types.h>
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14 #include <sys/user.h>
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15
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16 #ifdef __FreeBSD__
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17 # include <libutil.h>
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18 #elif defined(__APPLE__)
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19 # include <libproc.h>
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20 #endif
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21
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22 namespace animia::internal::unix {
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23
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24 /* this is a cleaned up version of a function from... Apple?
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25 ...anyway, what it essentially does is gets the size and stuff from
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26 sysctl() and reserves the space in a vector to store the PIDs */
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27 bool UnixFdTools::GetAllPids(std::set<pid_t>& pids) {
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28 struct kinfo_proc* result = NULL;
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29 size_t length = 0;
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30 static const int name[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
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31
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32 /* get appropriate length from sysctl()
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33 note: the reason this isn't checked is actually because this will
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34 *always* return an error on OS X (or... maybe I'm doing it wrong :) ) */
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35 sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, NULL, &length, NULL, 0);
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36
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37 result = (struct kinfo_proc*)malloc(length);
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38 if (result == NULL)
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39 return std::vector<int>();
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40
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41 /* TODO: this might actually return ENOMEM if the amount of file handles changes between the
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42 original sysctl() call and this one, which is technically possible */
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43 if (sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, result, &length, NULL, 0) == ENOMEM) {
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44 assert(result != NULL);
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45 free(result);
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46 throw std::bad_alloc();
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47 }
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48
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49 /* add pids to our vector */
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50 pids.reserve(length / sizeof(*result));
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51 for (int i = 0; i < length / sizeof(*result); i++)
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52 pids.push_back(result[i].kp_proc.p_pid);
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53 }
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54
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55 bool UnixFdTools::GetProcessName(pid_t pid, std::string& result) {
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56 #ifdef __FreeBSD__
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57 struct kinfo_proc* proc = kinfo_getproc(pid);
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58 if (!proc)
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59 return false;
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60 result = proc->ki_comm;
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61
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62 /* FreeBSD manpage for kinfo_getproc():
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63 "The pointer was obtained by an internal call to malloc(3) and
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64 must be freed by the caller with a call to free(3)." */
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65 free(proc);
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66
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67 return true;
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68 #elif defined(__APPLE__)
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69 struct proc_bsdinfo proc;
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70
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71 int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
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72 if (st != PROC_PIDTBSDINFO_SIZE)
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73 return false;
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74
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75 /* fixme: is this right? pbi_comm is an alternative, but it reduces the string size to
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76 16 chars. does pbi_name do the same, or is it different? */
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77 result = proc.pbi_name;
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78 return true;
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79 #endif
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80 }
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81
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82 /* this only works on OS X :( */
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83 bool UnixFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, std::vector<std::tuple<pid_t, std::string>>& files) {
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84 for (const auto& pid : pids) {
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85 int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
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86 if (bufsz == -1)
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87 return false;
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88
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89 struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
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90 if (!info)
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91 return false;
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92
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93 proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
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94
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95 for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
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96 if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
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97 struct vnode_fdinfowithpath vnodeInfo;
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98
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99 int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo, PROC_PIDFDVNODEPATHINFO_SIZE);
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100 if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
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101 return false;
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102
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103 /* this doesn't work!
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104 if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
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105 continue;
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106 */
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107
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108 files.push_back({pid, vnodeInfo.pvip.vip_path});
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109 }
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110 }
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111 }
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112 return true;
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113 }
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114
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115 } // namespace animia::internal::unix