1 // Copyright 2012 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "base/process/internal_aix.h"
6
7 #include <sys/procfs.h>
8
9 #include <errno.h>
10 #include <fcntl.h>
11 #include <limits.h>
12 #include <unistd.h>
13
14 #include <map>
15 #include <string>
16 #include <vector>
17
18 #include "base/files/file_util.h"
19 #include "base/logging.h"
20 #include "base/strings/string_number_conversions.h"
21 #include "base/strings/string_split.h"
22 #include "base/strings/string_util.h"
23 #include "base/threading/thread_restrictions.h"
24 #include "base/time/time.h"
25
26 // Not defined on AIX by default.
27 #define NAME_MAX 255
28
29 namespace base {
30 namespace internalAIX {
31
32 const char kProcDir[] = "/proc";
33
34 const char kStatFile[] = "psinfo"; // AIX specific
35
GetProcPidDir(pid_t pid)36 FilePath GetProcPidDir(pid_t pid) {
37 return FilePath(kProcDir).Append(NumberToString(pid));
38 }
39
ProcDirSlotToPid(const char * d_name)40 pid_t ProcDirSlotToPid(const char* d_name) {
41 int i;
42 for (i = 0; i < NAME_MAX && d_name[i]; ++i) {
43 if (!IsAsciiDigit(d_name[i])) {
44 return 0;
45 }
46 }
47 if (i == NAME_MAX)
48 return 0;
49
50 // Read the process's command line.
51 pid_t pid;
52 std::string pid_string(d_name);
53 if (!StringToInt(pid_string, &pid)) {
54 NOTREACHED();
55 }
56 return pid;
57 }
58
ReadProcFile(const FilePath & file,struct psinfo * info)59 bool ReadProcFile(const FilePath& file, struct psinfo* info) {
60 // Synchronously reading files in /proc is safe.
61 ScopedAllowBlocking scoped_allow_blocking;
62 int fileId;
63 if ((fileId = open(file.value().c_str(), O_RDONLY)) < 0) {
64 DPLOG(WARNING) << "Failed to open " << file.MaybeAsASCII();
65 return false;
66 }
67
68 if (read(fileId, info, sizeof(*info)) < 0) {
69 DPLOG(WARNING) << "Failed to read " << file.MaybeAsASCII();
70 return false;
71 }
72
73 return true;
74 }
75
ReadProcStats(pid_t pid,struct psinfo * info)76 bool ReadProcStats(pid_t pid, struct psinfo* info) {
77 FilePath stat_file = internalAIX::GetProcPidDir(pid).Append(kStatFile);
78 return ReadProcFile(stat_file, info);
79 }
80
ParseProcStats(struct psinfo & stats_data,std::vector<std::string> * proc_stats)81 bool ParseProcStats(struct psinfo& stats_data,
82 std::vector<std::string>* proc_stats) {
83 // The stat file is formatted as:
84 // struct psinfo
85 // see -
86 // https://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.files/proc.htm
87 proc_stats->clear();
88 // PID.
89 proc_stats->push_back(NumberToString(stats_data.pr_pid));
90 // Process name without parentheses. // 1
91 proc_stats->push_back(stats_data.pr_fname);
92 // Process State (Not available) // 2
93 proc_stats->push_back("0");
94 // Process id of parent // 3
95 proc_stats->push_back(NumberToString(stats_data.pr_ppid));
96
97 // Process group id // 4
98 proc_stats->push_back(NumberToString(stats_data.pr_pgid));
99
100 return true;
101 }
102
103 typedef std::map<std::string, std::string> ProcStatMap;
ParseProcStat(const std::string & contents,ProcStatMap * output)104 void ParseProcStat(const std::string& contents, ProcStatMap* output) {
105 StringPairs key_value_pairs;
106 SplitStringIntoKeyValuePairs(contents, ' ', '\n', &key_value_pairs);
107 for (size_t i = 0; i < key_value_pairs.size(); ++i) {
108 output->insert(key_value_pairs[i]);
109 }
110 }
111
GetProcStatsFieldAsInt64(const std::vector<std::string> & proc_stats,ProcStatsFields field_num)112 int64_t GetProcStatsFieldAsInt64(const std::vector<std::string>& proc_stats,
113 ProcStatsFields field_num) {
114 DCHECK_GE(field_num, VM_PPID);
115 CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
116
117 int64_t value;
118 return StringToInt64(proc_stats[field_num], &value) ? value : 0;
119 }
120
GetProcStatsFieldAsSizeT(const std::vector<std::string> & proc_stats,ProcStatsFields field_num)121 size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats,
122 ProcStatsFields field_num) {
123 DCHECK_GE(field_num, VM_PPID);
124 CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
125
126 size_t value;
127 return StringToSizeT(proc_stats[field_num], &value) ? value : 0;
128 }
129
ReadProcStatsAndGetFieldAsInt64(pid_t pid,ProcStatsFields field_num)130 int64_t ReadProcStatsAndGetFieldAsInt64(pid_t pid, ProcStatsFields field_num) {
131 struct psinfo stats_data;
132 if (!ReadProcStats(pid, &stats_data))
133 return 0;
134 std::vector<std::string> proc_stats;
135 if (!ParseProcStats(stats_data, &proc_stats))
136 return 0;
137
138 return GetProcStatsFieldAsInt64(proc_stats, field_num);
139 }
140
ReadProcStatsAndGetFieldAsSizeT(pid_t pid,ProcStatsFields field_num)141 size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid, ProcStatsFields field_num) {
142 struct psinfo stats_data;
143 if (!ReadProcStats(pid, &stats_data))
144 return 0;
145 std::vector<std::string> proc_stats;
146 if (!ParseProcStats(stats_data, &proc_stats))
147 return 0;
148 return GetProcStatsFieldAsSizeT(proc_stats, field_num);
149 }
150
151 } // namespace internalAIX
152 } // namespace base
153