GN: aix port along with linux_s390x, linux_ppc64 and linux_ppc64le support.

base/process/internal_aix.cc

Index: base/process/internal_aix.cc
diff --git a/base/process/internal_aix.cc b/base/process/internal_aix.cc
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+++ b/base/process/internal_aix.cc
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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/process/internal_aix.h"
+
+#include <sys/procfs.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/time/time.h"
+
+// Not defined on AIX by default.
+#define NAME_MAX 255
+
+namespace base {
+namespace internalAIX {
+
+const char kProcDir[] = "/proc";
+
+const char kStatFile[] = "psinfo";  // AIX specific
+
+FilePath GetProcPidDir(pid_t pid) {
+  return FilePath(kProcDir).Append(IntToString(pid));
+}
+
+pid_t ProcDirSlotToPid(const char* d_name) {
+  int i;
+  for (i = 0; i < NAME_MAX && d_name[i]; ++i) {
+    if (!IsAsciiDigit(d_name[i])) {
+      return 0;
+    }
+  }
+  if (i == NAME_MAX)
+    return 0;
+
+  // Read the process's command line.
+  pid_t pid;
+  std::string pid_string(d_name);
+  if (!StringToInt(pid_string, &pid)) {
+    NOTREACHED();
+    return 0;
+  }
+  return pid;
+}
+
+bool ReadProcFile(const FilePath& file, struct psinfo* info) {
+  // Synchronously reading files in /proc is safe.
+  ThreadRestrictions::ScopedAllowIO allow_io;
+  int fileId;
+  if ((fileId = open(file.value().c_str(), O_RDONLY)) < 0) {
+    DLOG(WARNING) << "Failed to open " << file.MaybeAsASCII()
+                  << " errno = " << errno;
+    return false;
+  }
+
+  if (read(fileId, info, sizeof(*info)) < 0) {
+    DLOG(WARNING) << "Failed to read " << file.MaybeAsASCII()
+                  << " errno = " << errno;
+    return false;
+  }
+
+  return true;
+}
+
+bool ReadProcStats(pid_t pid, struct psinfo* info) {
+  FilePath stat_file = internalAIX::GetProcPidDir(pid).Append(kStatFile);
+  return ReadProcFile(stat_file, info);
+}
+
+bool ParseProcStats(struct psinfo& stats_data,
+                    std::vector<std::string>* proc_stats) {
+  // The stat file is formatted as:
+  // struct psinfo
+  // see -
+  // https://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.files/proc.htm
+  proc_stats->clear();
+  // PID.
+  proc_stats->push_back(IntToString(stats_data.pr_pid));
+  // Process name without parentheses. // 1
+  proc_stats->push_back(stats_data.pr_fname);
+  // Process State (Not available)  // 2
+  proc_stats->push_back("0");
+  // Process id of parent  // 3
+  proc_stats->push_back(IntToString(stats_data.pr_ppid));
+
+  // Process group id // 4
+  proc_stats->push_back(IntToString(stats_data.pr_pgid));
+
+  return true;
+}
+
+typedef std::map<std::string, std::string> ProcStatMap;
+void ParseProcStat(const std::string& contents, ProcStatMap* output) {
+  StringPairs key_value_pairs;
+  SplitStringIntoKeyValuePairs(contents, ' ', '\n', &key_value_pairs);
+  for (size_t i = 0; i < key_value_pairs.size(); ++i) {
+    output->insert(key_value_pairs[i]);
+  }
+}
+
+int64_t GetProcStatsFieldAsInt64(const std::vector<std::string>& proc_stats,
+                                 ProcStatsFields field_num) {
+  DCHECK_GE(field_num, VM_PPID);
+  CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
+
+  int64_t value;
+  return StringToInt64(proc_stats[field_num], &value) ? value : 0;
+}
+
+size_t GetProcStatsFieldAsSizeT(const std::vector<std::string>& proc_stats,
+                                ProcStatsFields field_num) {
+  DCHECK_GE(field_num, VM_PPID);
+  CHECK_LT(static_cast<size_t>(field_num), proc_stats.size());
+
+  size_t value;
+  return StringToSizeT(proc_stats[field_num], &value) ? value : 0;
+}
+
+int64_t ReadProcStatsAndGetFieldAsInt64(pid_t pid, ProcStatsFields field_num) {
+  struct psinfo stats_data;
+  if (!ReadProcStats(pid, &stats_data))
+    return 0;
+  std::vector<std::string> proc_stats;
+  if (!ParseProcStats(stats_data, &proc_stats))
+    return 0;
+
+  return GetProcStatsFieldAsInt64(proc_stats, field_num);
+}
+
+size_t ReadProcStatsAndGetFieldAsSizeT(pid_t pid, ProcStatsFields field_num) {
+  struct psinfo stats_data;
+  if (!ReadProcStats(pid, &stats_data))
+    return 0;
+  std::vector<std::string> proc_stats;
+  if (!ParseProcStats(stats_data, &proc_stats))
+    return 0;
+  return GetProcStatsFieldAsSizeT(proc_stats, field_num);
+}
+
+}  // namespace internalAIX
+}  // namespace base