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annotate dep/animia/src/fd/bsd.cc @ 138:28842a8d0c6b

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dep/animia: huge refactor (again...) but this time, it actually compiles! and it WORKS! (on win32... not sure about other platforms...) configuring players is still not supported: at some point I'll prune something up...
author Paper <mrpapersonic@gmail.com>
date Sun, 12 Nov 2023 04:53:19 -0500
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children 478f3b366199
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138
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1 /**
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2 * bsd.cpp
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3 * - provides support for most* versions of BSD
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4 * - this also works for OS X :)
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5 * more technical details: this is essentially a wrapper
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6 * around the very C-like BSD system functions that are...
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7 * kind of unnatural to use in modern C++.
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8 **/
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9 #include <fcntl.h>
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10 #include <iostream>
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11 #include <string>
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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 #include <unordered_map>
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16 #include <vector>
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17 #ifdef __FreeBSD__
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18 # include <libutil.h>
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19 #elif defined(__APPLE__)
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20 # include <libproc.h>
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21 #endif
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22
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23 namespace animia::internal::unix {
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24
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25 /* this is a cleaned up version of a function from... Apple?
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26 ...anyway, what it essentially does is gets the size and stuff from
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27 sysctl() and reserves the space in a vector to store the PIDs */
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28 bool GetAllPids(std::set<pid_t>& pids) {
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29 struct kinfo_proc* result = NULL;
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30 size_t length = 0;
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31 static const int name[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
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32
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33 /* get appropriate length from sysctl()
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34 note: the reason this isn't checked is actually because this will
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35 *always* return an error on OS X (or... maybe I'm doing it wrong :) ) */
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36 sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, NULL, &length, NULL, 0);
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37
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38 result = (struct kinfo_proc*)malloc(length);
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39 if (result == NULL)
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40 return std::vector<int>();
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41
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42 /* TODO: this might actually return ENOMEM if the amount of file handles changes between the
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43 original sysctl() call and this one, which is technically possible */
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44 if (sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, result, &length, NULL, 0) == ENOMEM) {
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45 assert(result != NULL);
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46 free(result);
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47 throw std::bad_alloc();
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48 }
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49
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50 /* add pids to our vector */
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51 pids.reserve(length / sizeof(*result));
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52 for (int i = 0; i < length / sizeof(*result); i++)
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53 pids.push_back(result[i].kp_proc.p_pid);
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54 }
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55
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56 bool GetProcessName(pid_t pid, std::string& result) {
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57 #ifdef __FreeBSD__
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58 struct kinfo_proc* proc = kinfo_getproc(pid);
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59 if (!proc)
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60 return false;
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61 result = proc->ki_comm;
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62
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63 /* FreeBSD manpage for kinfo_getproc():
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64 "The pointer was obtained by an internal call to malloc(3) and
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65 must be freed by the caller with a call to free(3)." */
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66 free(proc);
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67
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68 return true;
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69 #elif defined(__APPLE__)
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70 struct proc_bsdinfo proc;
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71
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72 int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
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73 if (st != PROC_PIDTBSDINFO_SIZE)
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74 return false;
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75
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76 /* fixme: is this right? pbi_comm is an alternative, but it reduces the string size to
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77 16 chars. does pbi_name do the same, or is it different? */
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78 result = proc.pbi_name;
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79 return true;
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80 #endif
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81 }
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82
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83 /* this only works on OS X :( */
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84 bool EnumerateOpenFiles(const std::set<pid_t>& pids, std::vector<std::tuple<pid_t, std::string>>& files) {
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85 for (const auto& pid : pids) {
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86 int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
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87 if (bufsz == -1)
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88 return false;
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89
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90 struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
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91 if (!info)
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92 return false;
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93
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94 proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
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95
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96 for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
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97 if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
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98 struct vnode_fdinfowithpath vnodeInfo;
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99
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100 int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo, PROC_PIDFDVNODEPATHINFO_SIZE);
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101 if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
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102 return false;
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103
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104 /* this doesn't work!
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105 if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
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106 continue;
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107 */
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108
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109 files.push_back({pid, vnodeInfo.pvip.vip_path});
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110 }
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111 }
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112 }
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113 return true;
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114 }
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115
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116 } // namespace animia::internal::unix