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annotate dep/animia/src/fd/bsd.cc @ 150:ffa535b6d630

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*: avoid usage of std::[pair,tuple] https://arne-mertz.de/2017/03/smelly-pair-tuple/ it's better to use real structures and such where variables are easily known... also apparently using [] on structs is actually valid? I had no idea.
author Paper <mrpapersonic@gmail.com>
date Tue, 14 Nov 2023 16:27:33 -0500
parents aa4df5a84338
children 54744a48a7d7
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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 "animia/fd/bsd.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 <iostream>
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11 #include <string>
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12
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13 #include <fcntl.h>
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14 #include <sys/sysctl.h>
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15 #include <sys/types.h>
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16 #include <sys/user.h>
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17
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18 #ifdef __FreeBSD__
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19 # include <libutil.h>
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20 #elif defined(__APPLE__)
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21 # include <libproc.h>
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22 #endif
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23
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24 namespace animia::internal::unix {
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25
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26 /* this is a cleaned up version of a function from... Apple?
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27 ...anyway, what it essentially does is gets the size and stuff from
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28 sysctl() and reserves the space in a vector to store the PIDs
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29
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30 TODO: https://kaashif.co.uk/2015/06/18/how-to-get-a-list-of-processes-on-openbsd-in-c/ */
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31 bool UnixFdTools::GetAllPids(std::set<pid_t>& pids) {
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32 struct kinfo_proc* result = NULL;
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33 size_t length = 0;
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34 static const int name[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0};
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35
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36 /* get appropriate length from sysctl()
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37 note: the reason this isn't checked is actually because this will
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38 *always* return an error on OS X (or... maybe I'm doing it wrong :) ) */
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39 sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, NULL, &length, NULL, 0);
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40
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41 result = (struct kinfo_proc*)malloc(length);
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42 if (result == NULL)
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43 return std::vector<int>();
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44
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45 /* TODO: this might actually return ENOMEM if the amount of file handles changes between the
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46 original sysctl() call and this one, which is technically possible */
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47 if (sysctl((int*)name, (sizeof(name) / sizeof(*name)) - 1, result, &length, NULL, 0) == ENOMEM) {
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48 assert(result != NULL);
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49 free(result);
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50 throw std::bad_alloc();
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51 }
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52
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53 /* add pids to our vector */
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54 pids.reserve(length / sizeof(*result));
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55 for (int i = 0; i < length / sizeof(*result); i++)
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56 pids.insert(result[i].kp_proc.p_pid);
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57 }
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58
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59 bool UnixFdTools::GetProcessName(pid_t pid, std::string& result) {
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60 #ifdef __FreeBSD__
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61 struct kinfo_proc* proc = kinfo_getproc(pid);
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62 if (!proc)
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63 return false;
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64 result = proc->ki_comm;
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65
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66 /* FreeBSD manpage for kinfo_getproc():
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67 "The pointer was obtained by an internal call to malloc(3) and
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68 must be freed by the caller with a call to free(3)." */
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69 free(proc);
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70
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71 return true;
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72 #elif defined(__APPLE__)
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73 struct proc_bsdinfo proc;
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74
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75 int st = proc_pidinfo(pid, PROC_PIDTBSDINFO, 0, &proc, PROC_PIDTBSDINFO_SIZE);
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76 if (st != PROC_PIDTBSDINFO_SIZE)
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77 return false;
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78
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79 /* fixme: is this right? pbi_comm is an alternative, but it reduces the string size to
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80 16 chars. does pbi_name do the same, or is it different? */
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81 result = proc.pbi_name;
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82 return true;
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83 #endif
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84 }
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85
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86 /* this only works on OS X :( */
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87 bool UnixFdTools::EnumerateOpenFiles(const std::set<pid_t>& pids, std::vector<std::pair<pid_t, std::string>>& files) {
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88 for (const auto& pid : pids) {
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89 int bufsz = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, NULL, 0);
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90 if (bufsz == -1)
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91 return false;
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92
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93 struct proc_fdinfo* info = (struct proc_fdinfo*)malloc(bufsz);
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94 if (!info)
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95 return false;
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96
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97 proc_pidinfo(pid, PROC_PIDLISTFDS, 0, info, bufsz);
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98
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99 for (int i = 0; i < bufsz / sizeof(info[0]); i++) {
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100 if (info[i].proc_fdtype == PROX_FDTYPE_VNODE) {
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101 struct vnode_fdinfowithpath vnodeInfo;
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102
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103 int sz = proc_pidfdinfo(pid, info[i].proc_fd, PROC_PIDFDVNODEPATHINFO, &vnodeInfo, PROC_PIDFDVNODEPATHINFO_SIZE);
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104 if (sz != PROC_PIDFDVNODEPATHINFO_SIZE)
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105 return false;
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106
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107 /* this doesn't work!
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108 if (vnodeInfo.pfi.fi_openflags & O_WRONLY || vnodeInfo.pfi.fi_openflags & O_RDWR)
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109 continue;
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110 */
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111
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112 OpenFile file;
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113 file.pid = pid;
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114 file.path = vnodeInfo.pvip.vip_path;
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115
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116 files.push_back(file);
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117 }
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118 }
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119 }
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120 return true;
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121 }
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122
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123 } // namespace animia::internal::unix