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annotate dep/animia/src/fd/xnu.cc @ 153:bd439dd6ffc5

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*: make win stuff actually work, rename bsd.cc to xnu.cc It's been OS X only for ages, and these functions are different between most BSDs anyway
author Paper <mrpapersonic@gmail.com>
date Wed, 15 Nov 2023 13:28:18 -0500
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children d43d68408d3c
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153
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Paper <mrpapersonic@gmail.com>
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1 /*
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2 ** fd/xnu.cpp
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3 ** - provides support for XNU (part of Darwin)
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4 */
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5 #include "animia/fd/xnu.h"
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6 #include "animia.h"
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7
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8 #include <unordered_map>
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9 #include <vector>
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10 #include <string>
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11
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12 #include <fcntl.h>
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13 #include <sys/sysctl.h>
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14 #include <sys/types.h>
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15 #include <sys/user.h>
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16 #include <libproc.h>
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17
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18 namespace animia::internal::xnu {
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19
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20 static bool GetProcessName(pid_t pid, std::string& result) {
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21 struct proc_bsdinfo proc;
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22
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23 int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
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24 if (st != PROC_PIDTBSDINFO_SIZE)
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25 return false;
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26
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27 /* fixme: is this right? pbi_comm is an alternative, but it reduces the string size to
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28 16 chars. does pbi_name do the same, or is it different? */
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29 result = proc.pbi_name;
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30 return true;
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31 }
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32
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33 /* this is a cleaned up version of a function from... Apple?
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34 ...anyway, what it essentially does is gets the size and stuff from
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35 sysctl() and reserves the space in a vector to store the PIDs */
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36 bool XnuFdTools::EnumerateOpenProcesses(process_proc_t process_proc) {
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37 struct kinfo_proc* result = NULL;
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38 size_t length = 0;
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39 static const int name[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
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40
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41 /* get appropriate length from sysctl()
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42 note: the reason this isn't checked is actually because this will
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43 *always* return an error on OS X (or... maybe I'm doing it wrong :) ) */
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44 sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, NULL, &length, NULL, 0);
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45
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46 result = (struct kinfo_proc*)malloc(length);
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47 if (result == NULL)
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48 return false;
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49
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50 /* TODO: this might actually return ENOMEM if the amount of file handles changes between the
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51 original sysctl() call and this one, which is technically possible */
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52 if (sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, result, &length, NULL, 0) == ENOMEM) {
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53 assert(result != NULL);
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54 free(result);
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55 return false;
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56 }
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57
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58 for (int i = 0; i < length / sizeof(*result); i++) {
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59 const pid_t pid = result[i].kp_proc.p_pid;
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60 if (!process_proc({pid, GetProcessName(pid)}))
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61 return false;
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62 }
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63 }
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64
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65 bool XnuFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, open_file_proc_t open_file_proc) {
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66 if (!open_file_proc)
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67 return false;
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68
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69 for (const auto& pid : pids) {
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70 int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
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71 if (bufsz == -1)
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72 return false;
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73
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74 struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
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75 if (!info)
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76 return false;
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77
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78 proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
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79
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80 for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
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81 if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
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82 struct vnode_fdinfowithpath vnodeInfo;
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83
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84 int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo, PROC_PIDFDVNODEPATHINFO_SIZE);
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85 if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
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86 return false;
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87
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88 /* this doesn't work!
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89 if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
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90 continue;
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91 */
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92
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93 if (!open_file_proc({pid, vnodeInfo.pvip.vip_path}))
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94 return false;
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95 }
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96 }
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97 }
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98 return true;
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99 }
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100
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101 } // namespace animia::internal::unix