Adding upstream version 3.2.2.upstream/3.2.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 1538 insertions, 0 deletions

diff --git a/netbsd/NetBSDProcess.c b/netbsd/NetBSDProcess.c
new file mode 100644
index 0000000..4d4ac4e
--- /dev/null
+++ b/netbsd/NetBSDProcess.c
@@ -0,0 +1,264 @@
+/*
+htop - NetBSDProcess.c
+(C) 2015 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "netbsd/NetBSDProcess.h"
+
+#include <stdlib.h>
+
+#include "CRT.h"
+#include "Process.h"
+#include "RichString.h"
+#include "XUtils.h"
+
+
+const ProcessFieldData Process_fields[LAST_PROCESSFIELD] = {
+   [0] = {
+      .name = "",
+      .title = NULL,
+      .description = NULL,
+      .flags = 0,
+   },
+   [PID] = {
+      .name = "PID",
+      .title = "PID",
+      .description = "Process/thread ID",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [COMM] = {
+      .name = "Command",
+      .title = "Command ",
+      .description = "Command line",
+      .flags = 0,
+   },
+   [STATE] = {
+      .name = "STATE",
+      .title = "S ",
+      .description = "Process state (S sleeping, R running, D disk, Z zombie, T traced, W paging)",
+      .flags = 0,
+   },
+   [PPID] = {
+      .name = "PPID",
+      .title = "PPID",
+      .description = "Parent process ID",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [PGRP] = {
+      .name = "PGRP",
+      .title = "PGRP",
+      .description = "Process group ID",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [SESSION] = {
+      .name = "SESSION",
+      .title = "SESN",
+      .description = "Process's session ID",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [TTY] = {
+      .name = "TTY",
+      .title = "TTY      ",
+      .description = "Controlling terminal",
+      .flags = 0,
+   },
+   [TPGID] = {
+      .name = "TPGID",
+      .title = "TPGID",
+      .description = "Process ID of the fg process group of the controlling terminal",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [MINFLT] = {
+      .name = "MINFLT",
+      .title = "     MINFLT ",
+      .description = "Number of minor faults which have not required loading a memory page from disk",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [MAJFLT] = {
+      .name = "MAJFLT",
+      .title = "     MAJFLT ",
+      .description = "Number of major faults which have required loading a memory page from disk",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [PRIORITY] = {
+      .name = "PRIORITY",
+      .title = "PRI ",
+      .description = "Kernel's internal priority for the process",
+      .flags = 0,
+   },
+   [NICE] = {
+      .name = "NICE",
+      .title = " NI ",
+      .description = "Nice value (the higher the value, the more it lets other processes take priority)",
+      .flags = 0,
+   },
+   [STARTTIME] = {
+      .name = "STARTTIME",
+      .title = "START ",
+      .description = "Time the process was started",
+      .flags = 0,
+   },
+   [ELAPSED] = {
+      .name = "ELAPSED",
+      .title = "ELAPSED  ",
+      .description = "Time since the process was started",
+      .flags = 0,
+   },
+   [PROCESSOR] = {
+      .name = "PROCESSOR",
+      .title = "CPU ",
+      .description = "Id of the CPU the process last executed on",
+      .flags = 0,
+   },
+   [M_VIRT] = {
+      .name = "M_VIRT",
+      .title = " VIRT ",
+      .description = "Total program size in virtual memory",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [M_RESIDENT] = {
+      .name = "M_RESIDENT",
+      .title = "  RES ",
+      .description = "Resident set size, size of the text and data sections, plus stack usage",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [ST_UID] = {
+      .name = "ST_UID",
+      .title = "UID",
+      .description = "User ID of the process owner",
+      .flags = 0,
+   },
+   [PERCENT_CPU] = {
+      .name = "PERCENT_CPU",
+      .title = " CPU%",
+      .description = "Percentage of the CPU time the process used in the last sampling",
+      .flags = 0,
+      .defaultSortDesc = true,
+      .autoWidth = true,
+   },
+   [PERCENT_NORM_CPU] = {
+      .name = "PERCENT_NORM_CPU",
+      .title = "NCPU%",
+      .description = "Normalized percentage of the CPU time the process used in the last sampling (normalized by cpu count)",
+      .flags = 0,
+      .defaultSortDesc = true,
+      .autoWidth = true,
+   },
+   [PERCENT_MEM] = {
+      .name = "PERCENT_MEM",
+      .title = "MEM% ",
+      .description = "Percentage of the memory the process is using, based on resident memory size",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [USER] = {
+      .name = "USER",
+      .title = "USER       ",
+      .description = "Username of the process owner (or user ID if name cannot be determined)",
+      .flags = 0,
+   },
+   [TIME] = {
+      .name = "TIME",
+      .title = "  TIME+  ",
+      .description = "Total time the process has spent in user and system time",
+      .flags = 0,
+      .defaultSortDesc = true,
+   },
+   [NLWP] = {
+      .name = "NLWP",
+      .title = "NLWP ",
+      .description = "Number of threads in the process",
+      .flags = 0,
+   },
+   [TGID] = {
+      .name = "TGID",
+      .title = "TGID",
+      .description = "Thread group ID (i.e. process ID)",
+      .flags = 0,
+      .pidColumn = true,
+   },
+   [PROC_COMM] = {
+      .name = "COMM",
+      .title = "COMM            ",
+      .description = "comm string of the process",
+      .flags = 0,
+   },
+   [PROC_EXE] = {
+      .name = "EXE",
+      .title = "EXE             ",
+      .description = "Basename of exe of the process",
+      .flags = 0,
+   },
+   [CWD] = {
+      .name = "CWD",
+      .title = "CWD                       ",
+      .description = "The current working directory of the process",
+      .flags = PROCESS_FLAG_CWD,
+   },
+
+};
+
+Process* NetBSDProcess_new(const Settings* settings) {
+   NetBSDProcess* this = xCalloc(1, sizeof(NetBSDProcess));
+   Object_setClass(this, Class(NetBSDProcess));
+   Process_init(&this->super, settings);
+   return &this->super;
+}
+
+void Process_delete(Object* cast) {
+   NetBSDProcess* this = (NetBSDProcess*) cast;
+   Process_done((Process*)cast);
+   free(this);
+}
+
+static void NetBSDProcess_writeField(const Process* this, RichString* str, ProcessField field) {
+   char buffer[256]; buffer[255] = '\0';
+   int attr = CRT_colors[DEFAULT_COLOR];
+
+   switch (field) {
+   // add NetBSD-specific fields here
+   default:
+      Process_writeField(this, str, field);
+      return;
+   }
+   RichString_appendWide(str, attr, buffer);
+}
+
+static int NetBSDProcess_compareByKey(const Process* v1, const Process* v2, ProcessField key) {
+   const NetBSDProcess* p1 = (const NetBSDProcess*)v1;
+   const NetBSDProcess* p2 = (const NetBSDProcess*)v2;
+
+   // remove if actually used
+   (void)p1; (void)p2;
+
+   switch (key) {
+   // add NetBSD-specific fields here
+   default:
+      return Process_compareByKey_Base(v1, v2, key);
+   }
+}
+
+const ProcessClass NetBSDProcess_class = {
+   .super = {
+      .extends = Class(Process),
+      .display = Process_display,
+      .delete = Process_delete,
+      .compare = Process_compare
+   },
+   .writeField = NetBSDProcess_writeField,
+   .compareByKey = NetBSDProcess_compareByKey
+};
diff --git a/netbsd/NetBSDProcess.h b/netbsd/NetBSDProcess.h
new file mode 100644
index 0000000..b9e6b26
--- /dev/null
+++ b/netbsd/NetBSDProcess.h
@@ -0,0 +1,32 @@
+#ifndef HEADER_NetBSDProcess
+#define HEADER_NetBSDProcess
+/*
+htop - NetBSDProcess.h
+(C) 2015 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include <stdbool.h>
+
+#include "Object.h"
+#include "Process.h"
+#include "Settings.h"
+
+
+typedef struct NetBSDProcess_ {
+   Process super;
+} NetBSDProcess;
+
+extern const ProcessClass NetBSDProcess_class;
+
+extern const ProcessFieldData Process_fields[LAST_PROCESSFIELD];
+
+Process* NetBSDProcess_new(const Settings* settings);
+
+void Process_delete(Object* cast);
+
+#endif
diff --git a/netbsd/NetBSDProcessList.c b/netbsd/NetBSDProcessList.c
new file mode 100644
index 0000000..197a150
--- /dev/null
+++ b/netbsd/NetBSDProcessList.c
@@ -0,0 +1,504 @@
+/*
+htop - NetBSDProcessList.c
+(C) 2014 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "netbsd/NetBSDProcessList.h"
+
+#include <kvm.h>
+#include <math.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mount.h>
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/sched.h>
+#include <sys/swap.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <uvm/uvm_extern.h>
+
+#include "CRT.h"
+#include "Macros.h"
+#include "Object.h"
+#include "Process.h"
+#include "ProcessList.h"
+#include "Settings.h"
+#include "XUtils.h"
+#include "netbsd/NetBSDProcess.h"
+
+
+static long fscale;
+static int pageSize;
+static int pageSizeKB;
+
+static const struct {
+   const char* name;
+   long int scale;
+} freqSysctls[] = {
+   { "machdep.est.frequency.current",            1 },
+   { "machdep.powernow.frequency.current",       1 },
+   { "machdep.intrepid.frequency.current",       1 },
+   { "machdep.loongson.frequency.current",       1 },
+   { "machdep.cpu.frequency.current",            1 },
+   { "machdep.frequency.current",                1 },
+   { "machdep.tsc_freq",                   1000000 },
+};
+
+static void NetBSDProcessList_updateCPUcount(ProcessList* super) {
+   NetBSDProcessList* opl = (NetBSDProcessList*) super;
+
+   // Definitions for sysctl(3), cf. https://nxr.netbsd.org/xref/src/sys/sys/sysctl.h#813
+   const int mib_ncpu_existing[] = { CTL_HW, HW_NCPU }; // Number of existing CPUs
+   const int mib_ncpu_online[] = { CTL_HW, HW_NCPUONLINE }; // Number of online/active CPUs
+
+   int r;
+   unsigned int value;
+   size_t size;
+
+   bool change = false;
+
+   // Query the number of active/online CPUs.
+   size = sizeof(value);
+   r = sysctl(mib_ncpu_online, 2, &value, &size, NULL, 0);
+   if (r < 0 || value < 1) {
+      value = 1;
+   }
+
+   if (value != super->activeCPUs) {
+      super->activeCPUs = value;
+      change = true;
+   }
+
+   // Query the total number of CPUs.
+   size = sizeof(value);
+   r = sysctl(mib_ncpu_existing, 2, &value, &size, NULL, 0);
+   if (r < 0 || value < 1) {
+      value = super->activeCPUs;
+   }
+
+   if (value != super->existingCPUs) {
+      opl->cpuData = xReallocArray(opl->cpuData, value + 1, sizeof(CPUData));
+      super->existingCPUs = value;
+      change = true;
+   }
+
+   // Reset CPU stats when number of online/existing CPU cores changed
+   if (change) {
+      CPUData* dAvg = &opl->cpuData[0];
+      memset(dAvg, '\0', sizeof(CPUData));
+      dAvg->totalTime = 1;
+      dAvg->totalPeriod = 1;
+
+      for (unsigned int i = 0; i < super->existingCPUs; i++) {
+         CPUData* d = &opl->cpuData[i + 1];
+         memset(d, '\0', sizeof(CPUData));
+         d->totalTime = 1;
+         d->totalPeriod = 1;
+      }
+   }
+}
+
+ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* dynamicMeters, Hashtable* dynamicColumns, Hashtable* pidMatchList, uid_t userId) {
+   const int fmib[] = { CTL_KERN, KERN_FSCALE };
+   size_t size;
+   char errbuf[_POSIX2_LINE_MAX];
+
+   NetBSDProcessList* npl = xCalloc(1, sizeof(NetBSDProcessList));
+   ProcessList* pl = (ProcessList*) npl;
+   ProcessList_init(pl, Class(NetBSDProcess), usersTable, dynamicMeters, dynamicColumns, pidMatchList, userId);
+
+   NetBSDProcessList_updateCPUcount(pl);
+
+   size = sizeof(fscale);
+   if (sysctl(fmib, 2, &fscale, &size, NULL, 0) < 0) {
+      CRT_fatalError("fscale sysctl call failed");
+   }
+
+   if ((pageSize = sysconf(_SC_PAGESIZE)) == -1)
+      CRT_fatalError("pagesize sysconf call failed");
+   pageSizeKB = pageSize / ONE_K;
+
+   npl->kd = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf);
+   if (npl->kd == NULL) {
+      CRT_fatalError("kvm_openfiles() failed");
+   }
+
+   return pl;
+}
+
+void ProcessList_delete(ProcessList* this) {
+   NetBSDProcessList* npl = (NetBSDProcessList*) this;
+
+   if (npl->kd) {
+      kvm_close(npl->kd);
+   }
+
+   free(npl->cpuData);
+
+   ProcessList_done(this);
+   free(this);
+}
+
+static void NetBSDProcessList_scanMemoryInfo(ProcessList* pl) {
+   static int uvmexp_mib[] = {CTL_VM, VM_UVMEXP2};
+   struct uvmexp_sysctl uvmexp;
+   size_t size_uvmexp = sizeof(uvmexp);
+
+   if (sysctl(uvmexp_mib, 2, &uvmexp, &size_uvmexp, NULL, 0) < 0) {
+      CRT_fatalError("uvmexp sysctl call failed");
+   }
+
+   pl->totalMem = uvmexp.npages * pageSizeKB;
+   pl->buffersMem = 0;
+   pl->cachedMem = (uvmexp.filepages + uvmexp.execpages) * pageSizeKB;
+   pl->usedMem = (uvmexp.active + uvmexp.wired) * pageSizeKB;
+   pl->totalSwap = uvmexp.swpages * pageSizeKB;
+   pl->usedSwap = uvmexp.swpginuse * pageSizeKB;
+}
+
+static void NetBSDProcessList_updateExe(const struct kinfo_proc2* kproc, Process* proc) {
+   const int mib[] = { CTL_KERN, KERN_PROC_ARGS, kproc->p_pid, KERN_PROC_PATHNAME };
+   char buffer[2048];
+   size_t size = sizeof(buffer);
+   if (sysctl(mib, 4, buffer, &size, NULL, 0) != 0) {
+      Process_updateExe(proc, NULL);
+      return;
+   }
+
+   /* Kernel threads return an empty buffer */
+   if (buffer[0] == '\0') {
+      Process_updateExe(proc, NULL);
+      return;
+   }
+
+   Process_updateExe(proc, buffer);
+}
+
+static void NetBSDProcessList_updateCwd(const struct kinfo_proc2* kproc, Process* proc) {
+   const int mib[] = { CTL_KERN, KERN_PROC_ARGS, kproc->p_pid, KERN_PROC_CWD };
+   char buffer[2048];
+   size_t size = sizeof(buffer);
+   if (sysctl(mib, 4, buffer, &size, NULL, 0) != 0) {
+      free(proc->procCwd);
+      proc->procCwd = NULL;
+      return;
+   }
+
+   /* Kernel threads return an empty buffer */
+   if (buffer[0] == '\0') {
+      free(proc->procCwd);
+      proc->procCwd = NULL;
+      return;
+   }
+
+   free_and_xStrdup(&proc->procCwd, buffer);
+}
+
+static void NetBSDProcessList_updateProcessName(kvm_t* kd, const struct kinfo_proc2* kproc, Process* proc) {
+   Process_updateComm(proc, kproc->p_comm);
+
+   /*
+    * Like NetBSD's top(1), we try to fall back to the command name
+    * (argv[0]) if we fail to construct the full command.
+    */
+   char** arg = kvm_getargv2(kd, kproc, 500);
+   if (arg == NULL || *arg == NULL) {
+      Process_updateCmdline(proc, kproc->p_comm, 0, strlen(kproc->p_comm));
+      return;
+   }
+
+   size_t len = 0;
+   for (int i = 0; arg[i] != NULL; i++) {
+      len += strlen(arg[i]) + 1;   /* room for arg and trailing space or NUL */
+   }
+
+   /* don't use xMalloc here - we want to handle huge argv's gracefully */
+   char* s;
+   if ((s = malloc(len)) == NULL) {
+      Process_updateCmdline(proc, kproc->p_comm, 0, strlen(kproc->p_comm));
+      return;
+   }
+
+   *s = '\0';
+
+   int start = 0;
+   int end = 0;
+   for (int i = 0; arg[i] != NULL; i++) {
+      size_t n = strlcat(s, arg[i], len);
+      if (i == 0) {
+         end = MINIMUM(n, len - 1);
+         /* check if cmdline ended earlier, e.g 'kdeinit5: Running...' */
+         for (int j = end; j > 0; j--) {
+            if (arg[0][j] == ' ' && arg[0][j - 1] != '\\') {
+               end = (arg[0][j - 1] == ':') ? (j - 1) : j;
+            }
+         }
+      }
+      /* the trailing space should get truncated anyway */
+      strlcat(s, " ", len);
+   }
+
+   Process_updateCmdline(proc, s, start, end);
+
+   free(s);
+}
+
+/*
+ * Borrowed with modifications from NetBSD's top(1).
+ */
+static double getpcpu(const struct kinfo_proc2* kp) {
+   if (fscale == 0)
+      return 0.0;
+
+   return 100.0 * (double)kp->p_pctcpu / fscale;
+}
+
+static void NetBSDProcessList_scanProcs(NetBSDProcessList* this) {
+   const Settings* settings = this->super.settings;
+   bool hideKernelThreads = settings->hideKernelThreads;
+   bool hideUserlandThreads = settings->hideUserlandThreads;
+   int count = 0;
+
+   const struct kinfo_proc2* kprocs = kvm_getproc2(this->kd, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc2), &count);
+
+   for (int i = 0; i < count; i++) {
+      const struct kinfo_proc2* kproc = &kprocs[i];
+
+      bool preExisting = false;
+      Process* proc = ProcessList_getProcess(&this->super, kproc->p_pid, &preExisting, NetBSDProcess_new);
+
+      proc->show = ! ((hideKernelThreads && Process_isKernelThread(proc)) || (hideUserlandThreads && Process_isUserlandThread(proc)));
+
+      if (!preExisting) {
+         proc->pid = kproc->p_pid;
+         proc->ppid = kproc->p_ppid;
+         proc->tpgid = kproc->p_tpgid;
+         proc->tgid = kproc->p_pid;
+         proc->session = kproc->p_sid;
+         proc->pgrp = kproc->p__pgid;
+         proc->isKernelThread = !!(kproc->p_flag & P_SYSTEM);
+         proc->isUserlandThread = proc->pid != proc->tgid;
+         proc->starttime_ctime = kproc->p_ustart_sec;
+         Process_fillStarttimeBuffer(proc);
+         ProcessList_add(&this->super, proc);
+
+         proc->tty_nr = kproc->p_tdev;
+         const char* name = ((dev_t)kproc->p_tdev != KERN_PROC_TTY_NODEV) ? devname(kproc->p_tdev, S_IFCHR) : NULL;
+         if (!name) {
+            free(proc->tty_name);
+            proc->tty_name = NULL;
+         } else {
+            free_and_xStrdup(&proc->tty_name, name);
+         }
+
+         NetBSDProcessList_updateExe(kproc, proc);
+         NetBSDProcessList_updateProcessName(this->kd, kproc, proc);
+      } else {
+         if (settings->updateProcessNames) {
+            NetBSDProcessList_updateProcessName(this->kd, kproc, proc);
+         }
+      }
+
+      if (settings->ss->flags & PROCESS_FLAG_CWD) {
+         NetBSDProcessList_updateCwd(kproc, proc);
+      }
+
+      if (proc->st_uid != kproc->p_uid) {
+         proc->st_uid = kproc->p_uid;
+         proc->user = UsersTable_getRef(this->super.usersTable, proc->st_uid);
+      }
+
+      proc->m_virt = kproc->p_vm_vsize;
+      proc->m_resident = kproc->p_vm_rssize;
+
+      proc->percent_mem = (proc->m_resident * pageSizeKB) / (double)(this->super.totalMem) * 100.0;
+      proc->percent_cpu = CLAMP(getpcpu(kproc), 0.0, this->super.activeCPUs * 100.0);
+      Process_updateCPUFieldWidths(proc->percent_cpu);
+
+      proc->nlwp = kproc->p_nlwps;
+      proc->nice = kproc->p_nice - 20;
+      proc->time = 100 * (kproc->p_rtime_sec + ((kproc->p_rtime_usec + 500000) / 1000000));
+      proc->priority = kproc->p_priority - PZERO;
+      proc->processor = kproc->p_cpuid;
+      proc->minflt = kproc->p_uru_minflt;
+      proc->majflt = kproc->p_uru_majflt;
+
+      int nlwps = 0;
+      const struct kinfo_lwp* klwps = kvm_getlwps(this->kd, kproc->p_pid, kproc->p_paddr, sizeof(struct kinfo_lwp), &nlwps);
+
+      /* TODO: According to the link below, SDYING should be a regarded state */
+      /* Taken from: https://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/sys/sys/proc.h */
+      switch (kproc->p_realstat) {
+      case SIDL:     proc->state = IDLE; break;
+      case SACTIVE:
+         // We only consider the first LWP with a one of the below states.
+         for (int j = 0; j < nlwps; j++) {
+            if (klwps) {
+               switch (klwps[j].l_stat) {
+               case LSONPROC: proc->state = RUNNING; break;
+               case LSRUN:    proc->state = RUNNABLE; break;
+               case LSSLEEP:  proc->state = SLEEPING; break;
+               case LSSTOP:   proc->state = STOPPED; break;
+               default:       proc->state = UNKNOWN;
+               }
+               if (proc->state != UNKNOWN)
+                  break;
+            } else {
+               proc->state = UNKNOWN;
+               break;
+            }
+         }
+         break;
+      case SSTOP:    proc->state = STOPPED; break;
+      case SZOMB:    proc->state = ZOMBIE; break;
+      case SDEAD:    proc->state = DEFUNCT; break;
+      default:       proc->state = UNKNOWN;
+      }
+
+      if (Process_isKernelThread(proc)) {
+         this->super.kernelThreads++;
+      } else if (Process_isUserlandThread(proc)) {
+         this->super.userlandThreads++;
+      }
+
+      this->super.totalTasks++;
+      if (proc->state == RUNNING) {
+         this->super.runningTasks++;
+      }
+      proc->updated = true;
+   }
+}
+
+static void getKernelCPUTimes(int cpuId, u_int64_t* times) {
+   const int mib[] = { CTL_KERN, KERN_CP_TIME, cpuId };
+   size_t length = sizeof(*times) * CPUSTATES;
+   if (sysctl(mib, 3, times, &length, NULL, 0) == -1 || length != sizeof(*times) * CPUSTATES) {
+      CRT_fatalError("sysctl kern.cp_time2 failed");
+   }
+}
+
+static void kernelCPUTimesToHtop(const u_int64_t* times, CPUData* cpu) {
+   unsigned long long totalTime = 0;
+   for (int i = 0; i < CPUSTATES; i++) {
+      totalTime += times[i];
+   }
+
+   unsigned long long sysAllTime = times[CP_INTR] + times[CP_SYS];
+
+   cpu->totalPeriod = saturatingSub(totalTime, cpu->totalTime);
+   cpu->userPeriod = saturatingSub(times[CP_USER], cpu->userTime);
+   cpu->nicePeriod = saturatingSub(times[CP_NICE], cpu->niceTime);
+   cpu->sysPeriod = saturatingSub(times[CP_SYS], cpu->sysTime);
+   cpu->sysAllPeriod = saturatingSub(sysAllTime, cpu->sysAllTime);
+   cpu->intrPeriod = saturatingSub(times[CP_INTR], cpu->intrTime);
+   cpu->idlePeriod = saturatingSub(times[CP_IDLE], cpu->idleTime);
+
+   cpu->totalTime = totalTime;
+   cpu->userTime = times[CP_USER];
+   cpu->niceTime = times[CP_NICE];
+   cpu->sysTime = times[CP_SYS];
+   cpu->sysAllTime = sysAllTime;
+   cpu->intrTime = times[CP_INTR];
+   cpu->idleTime = times[CP_IDLE];
+}
+
+static void NetBSDProcessList_scanCPUTime(NetBSDProcessList* this) {
+   u_int64_t kernelTimes[CPUSTATES] = {0};
+   u_int64_t avg[CPUSTATES] = {0};
+
+   for (unsigned int i = 0; i < this->super.existingCPUs; i++) {
+      getKernelCPUTimes(i, kernelTimes);
+      CPUData* cpu = &this->cpuData[i + 1];
+      kernelCPUTimesToHtop(kernelTimes, cpu);
+
+      avg[CP_USER] += cpu->userTime;
+      avg[CP_NICE] += cpu->niceTime;
+      avg[CP_SYS] += cpu->sysTime;
+      avg[CP_INTR] += cpu->intrTime;
+      avg[CP_IDLE] += cpu->idleTime;
+   }
+
+   for (int i = 0; i < CPUSTATES; i++) {
+      avg[i] /= this->super.activeCPUs;
+   }
+
+   kernelCPUTimesToHtop(avg, &this->cpuData[0]);
+}
+
+static void NetBSDProcessList_scanCPUFrequency(NetBSDProcessList* this) {
+   unsigned int cpus = this->super.existingCPUs;
+   bool match = false;
+   char name[64];
+   long int freq = 0;
+   size_t freqSize;
+
+   for (unsigned int i = 0; i < cpus; i++) {
+      this->cpuData[i + 1].frequency = NAN;
+   }
+
+   /* newer hardware supports per-core frequency, for e.g. ARM big.LITTLE */
+   for (unsigned int i = 0; i < cpus; i++) {
+      xSnprintf(name, sizeof(name), "machdep.cpufreq.cpu%u.current", i);
+      freqSize = sizeof(freq);
+      if (sysctlbyname(name, &freq, &freqSize, NULL, 0) != -1) {
+         this->cpuData[i + 1].frequency = freq; /* already in MHz */
+         match = true;
+      }
+   }
+
+   if (match) {
+      return;
+   }
+
+   /*
+    * Iterate through legacy sysctl nodes for single-core frequency until
+    * we find a match...
+    */
+   for (size_t i = 0; i < ARRAYSIZE(freqSysctls); i++) {
+      freqSize = sizeof(freq);
+      if (sysctlbyname(freqSysctls[i].name, &freq, &freqSize, NULL, 0) != -1) {
+         freq /= freqSysctls[i].scale; /* scale to MHz */
+         match = true;
+         break;
+      }
+   }
+
+   if (match) {
+      for (unsigned int i = 0; i < cpus; i++) {
+         this->cpuData[i + 1].frequency = freq;
+      }
+   }
+}
+
+void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate) {
+   NetBSDProcessList* npl = (NetBSDProcessList*) super;
+
+   NetBSDProcessList_scanMemoryInfo(super);
+   NetBSDProcessList_scanCPUTime(npl);
+
+   if (super->settings->showCPUFrequency) {
+      NetBSDProcessList_scanCPUFrequency(npl);
+   }
+
+   // in pause mode only gather global data for meters (CPU/memory/...)
+   if (pauseProcessUpdate) {
+      return;
+   }
+
+   NetBSDProcessList_scanProcs(npl);
+}
+
+bool ProcessList_isCPUonline(const ProcessList* super, unsigned int id) {
+   assert(id < super->existingCPUs);
+
+   // TODO: Support detecting online / offline CPUs.
+   return true;
+}
diff --git a/netbsd/NetBSDProcessList.h b/netbsd/NetBSDProcessList.h
new file mode 100644
index 0000000..d228f48
--- /dev/null
+++ b/netbsd/NetBSDProcessList.h
@@ -0,0 +1,58 @@
+#ifndef HEADER_NetBSDProcessList
+#define HEADER_NetBSDProcessList
+/*
+htop - NetBSDProcessList.h
+(C) 2014 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include <kvm.h>
+#include <stdbool.h>
+#include <sys/types.h>
+
+#include "Hashtable.h"
+#include "ProcessList.h"
+#include "UsersTable.h"
+
+
+typedef struct CPUData_ {
+   unsigned long long int totalTime;
+   unsigned long long int userTime;
+   unsigned long long int niceTime;
+   unsigned long long int sysTime;
+   unsigned long long int sysAllTime;
+   unsigned long long int spinTime;
+   unsigned long long int intrTime;
+   unsigned long long int idleTime;
+
+   unsigned long long int totalPeriod;
+   unsigned long long int userPeriod;
+   unsigned long long int nicePeriod;
+   unsigned long long int sysPeriod;
+   unsigned long long int sysAllPeriod;
+   unsigned long long int spinPeriod;
+   unsigned long long int intrPeriod;
+   unsigned long long int idlePeriod;
+
+   double frequency;
+} CPUData;
+
+typedef struct NetBSDProcessList_ {
+   ProcessList super;
+   kvm_t* kd;
+
+   CPUData* cpuData;
+} NetBSDProcessList;
+
+
+ProcessList* ProcessList_new(UsersTable* usersTable, Hashtable* dynamicMeters, Hashtable* dynamicColumns, Hashtable* pidMatchList, uid_t userId);
+
+void ProcessList_delete(ProcessList* this);
+
+void ProcessList_goThroughEntries(ProcessList* super, bool pauseProcessUpdate);
+
+#endif
diff --git a/netbsd/Platform.c b/netbsd/Platform.c
new file mode 100644
index 0000000..ad6050c
--- /dev/null
+++ b/netbsd/Platform.c
@@ -0,0 +1,509 @@
+/*
+htop - netbsd/Platform.c
+(C) 2014 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 Nia Alarie
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "netbsd/Platform.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <ifaddrs.h>
+#include <paths.h>
+#include <unistd.h>
+#include <kvm.h>
+#include <limits.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <net/if.h>
+#include <prop/proplib.h>
+#include <sys/envsys.h>
+#include <sys/iostat.h>
+#include <sys/param.h>
+#include <sys/resource.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include "CPUMeter.h"
+#include "ClockMeter.h"
+#include "DateMeter.h"
+#include "DateTimeMeter.h"
+#include "HostnameMeter.h"
+#include "LoadAverageMeter.h"
+#include "Macros.h"
+#include "MemoryMeter.h"
+#include "MemorySwapMeter.h"
+#include "Meter.h"
+#include "ProcessList.h"
+#include "Settings.h"
+#include "SignalsPanel.h"
+#include "SwapMeter.h"
+#include "SysArchMeter.h"
+#include "TasksMeter.h"
+#include "UptimeMeter.h"
+#include "XUtils.h"
+#include "netbsd/NetBSDProcess.h"
+#include "netbsd/NetBSDProcessList.h"
+
+/*
+ * The older proplib APIs will be deprecated in NetBSD 10, but we still
+ * want to support the 9.x stable branch.
+ *
+ * Create aliases for the newer functions that are missing from 9.x.
+ */
+#if !__NetBSD_Prereq__(9,99,65)
+#define prop_string_equals_string prop_string_equals_cstring
+#define prop_number_signed_value prop_number_integer_value
+#endif
+
+const ScreenDefaults Platform_defaultScreens[] = {
+   {
+      .name = "Main",
+      .columns = "PID USER PRIORITY NICE M_VIRT M_RESIDENT STATE PERCENT_CPU PERCENT_MEM TIME Command",
+      .sortKey = "PERCENT_CPU",
+   },
+};
+
+const unsigned int Platform_numberOfDefaultScreens = ARRAYSIZE(Platform_defaultScreens);
+
+/*
+ * See /usr/include/sys/signal.h
+ */
+const SignalItem Platform_signals[] = {
+   { .name = " 0 Cancel",      .number =  0 },
+   { .name = " 1 SIGHUP",      .number =  1 },
+   { .name = " 2 SIGINT",      .number =  2 },
+   { .name = " 3 SIGQUIT",     .number =  3 },
+   { .name = " 4 SIGILL",      .number =  4 },
+   { .name = " 5 SIGTRAP",     .number =  5 },
+   { .name = " 6 SIGABRT",     .number =  6 },
+   { .name = " 6 SIGIOT",      .number =  6 },
+   { .name = " 7 SIGEMT",      .number =  7 },
+   { .name = " 8 SIGFPE",      .number =  8 },
+   { .name = " 9 SIGKILL",     .number =  9 },
+   { .name = "10 SIGBUS",      .number = 10 },
+   { .name = "11 SIGSEGV",     .number = 11 },
+   { .name = "12 SIGSYS",      .number = 12 },
+   { .name = "13 SIGPIPE",     .number = 13 },
+   { .name = "14 SIGALRM",     .number = 14 },
+   { .name = "15 SIGTERM",     .number = 15 },
+   { .name = "16 SIGURG",      .number = 16 },
+   { .name = "17 SIGSTOP",     .number = 17 },
+   { .name = "18 SIGTSTP",     .number = 18 },
+   { .name = "19 SIGCONT",     .number = 19 },
+   { .name = "20 SIGCHLD",     .number = 20 },
+   { .name = "21 SIGTTIN",     .number = 21 },
+   { .name = "22 SIGTTOU",     .number = 22 },
+   { .name = "23 SIGIO",       .number = 23 },
+   { .name = "24 SIGXCPU",     .number = 24 },
+   { .name = "25 SIGXFSZ",     .number = 25 },
+   { .name = "26 SIGVTALRM",   .number = 26 },
+   { .name = "27 SIGPROF",     .number = 27 },
+   { .name = "28 SIGWINCH",    .number = 28 },
+   { .name = "29 SIGINFO",     .number = 29 },
+   { .name = "30 SIGUSR1",     .number = 30 },
+   { .name = "31 SIGUSR2",     .number = 31 },
+   { .name = "32 SIGPWR",      .number = 32 },
+   { .name = "33 SIGRTMIN",    .number = 33 },
+   { .name = "34 SIGRTMIN+1",  .number = 34 },
+   { .name = "35 SIGRTMIN+2",  .number = 35 },
+   { .name = "36 SIGRTMIN+3",  .number = 36 },
+   { .name = "37 SIGRTMIN+4",  .number = 37 },
+   { .name = "38 SIGRTMIN+5",  .number = 38 },
+   { .name = "39 SIGRTMIN+6",  .number = 39 },
+   { .name = "40 SIGRTMIN+7",  .number = 40 },
+   { .name = "41 SIGRTMIN+8",  .number = 41 },
+   { .name = "42 SIGRTMIN+9",  .number = 42 },
+   { .name = "43 SIGRTMIN+10", .number = 43 },
+   { .name = "44 SIGRTMIN+11", .number = 44 },
+   { .name = "45 SIGRTMIN+12", .number = 45 },
+   { .name = "46 SIGRTMIN+13", .number = 46 },
+   { .name = "47 SIGRTMIN+14", .number = 47 },
+   { .name = "48 SIGRTMIN+15", .number = 48 },
+   { .name = "49 SIGRTMIN+16", .number = 49 },
+   { .name = "50 SIGRTMIN+17", .number = 50 },
+   { .name = "51 SIGRTMIN+18", .number = 51 },
+   { .name = "52 SIGRTMIN+19", .number = 52 },
+   { .name = "53 SIGRTMIN+20", .number = 53 },
+   { .name = "54 SIGRTMIN+21", .number = 54 },
+   { .name = "55 SIGRTMIN+22", .number = 55 },
+   { .name = "56 SIGRTMIN+23", .number = 56 },
+   { .name = "57 SIGRTMIN+24", .number = 57 },
+   { .name = "58 SIGRTMIN+25", .number = 58 },
+   { .name = "59 SIGRTMIN+26", .number = 59 },
+   { .name = "60 SIGRTMIN+27", .number = 60 },
+   { .name = "61 SIGRTMIN+28", .number = 61 },
+   { .name = "62 SIGRTMIN+29", .number = 62 },
+   { .name = "63 SIGRTMAX",    .number = 63 },
+};
+
+const unsigned int Platform_numberOfSignals = ARRAYSIZE(Platform_signals);
+
+const MeterClass* const Platform_meterTypes[] = {
+   &CPUMeter_class,
+   &ClockMeter_class,
+   &DateMeter_class,
+   &DateTimeMeter_class,
+   &LoadAverageMeter_class,
+   &LoadMeter_class,
+   &MemoryMeter_class,
+   &SwapMeter_class,
+   &MemorySwapMeter_class,
+   &TasksMeter_class,
+   &UptimeMeter_class,
+   &BatteryMeter_class,
+   &HostnameMeter_class,
+   &SysArchMeter_class,
+   &AllCPUsMeter_class,
+   &AllCPUs2Meter_class,
+   &AllCPUs4Meter_class,
+   &AllCPUs8Meter_class,
+   &LeftCPUsMeter_class,
+   &RightCPUsMeter_class,
+   &LeftCPUs2Meter_class,
+   &RightCPUs2Meter_class,
+   &LeftCPUs4Meter_class,
+   &RightCPUs4Meter_class,
+   &LeftCPUs8Meter_class,
+   &RightCPUs8Meter_class,
+   &BlankMeter_class,
+   &DiskIOMeter_class,
+   &NetworkIOMeter_class,
+   NULL
+};
+
+bool Platform_init(void) {
+   /* no platform-specific setup needed */
+   return true;
+}
+
+void Platform_done(void) {
+   /* no platform-specific cleanup needed */
+}
+
+void Platform_setBindings(Htop_Action* keys) {
+   /* no platform-specific key bindings */
+   (void) keys;
+}
+
+int Platform_getUptime(void) {
+   struct timeval bootTime, currTime;
+   const int mib[2] = { CTL_KERN, KERN_BOOTTIME };
+   size_t size = sizeof(bootTime);
+
+   int err = sysctl(mib, 2, &bootTime, &size, NULL, 0);
+   if (err) {
+      return -1;
+   }
+   gettimeofday(&currTime, NULL);
+
+   return (int) difftime(currTime.tv_sec, bootTime.tv_sec);
+}
+
+void Platform_getLoadAverage(double* one, double* five, double* fifteen) {
+   struct loadavg loadAverage;
+   const int mib[2] = { CTL_VM, VM_LOADAVG };
+   size_t size = sizeof(loadAverage);
+
+   int err = sysctl(mib, 2, &loadAverage, &size, NULL, 0);
+   if (err) {
+      *one = 0;
+      *five = 0;
+      *fifteen = 0;
+      return;
+   }
+   *one     = (double) loadAverage.ldavg[0] / loadAverage.fscale;
+   *five    = (double) loadAverage.ldavg[1] / loadAverage.fscale;
+   *fifteen = (double) loadAverage.ldavg[2] / loadAverage.fscale;
+}
+
+int Platform_getMaxPid(void) {
+   // https://nxr.netbsd.org/xref/src/sys/sys/ansi.h#__pid_t
+   // pid is assigned as a 32bit Integer.
+   return INT32_MAX;
+}
+
+double Platform_setCPUValues(Meter* this, int cpu) {
+   const NetBSDProcessList* npl = (const NetBSDProcessList*) this->pl;
+   const CPUData* cpuData = &npl->cpuData[cpu];
+   double total = cpuData->totalPeriod == 0 ? 1 : cpuData->totalPeriod;
+   double totalPercent;
+   double* v = this->values;
+
+   v[CPU_METER_NICE] = cpuData->nicePeriod / total * 100.0;
+   v[CPU_METER_NORMAL] = cpuData->userPeriod / total * 100.0;
+   if (this->pl->settings->detailedCPUTime) {
+      v[CPU_METER_KERNEL]  = cpuData->sysPeriod / total * 100.0;
+      v[CPU_METER_IRQ]     = cpuData->intrPeriod / total * 100.0;
+      v[CPU_METER_SOFTIRQ] = 0.0;
+      v[CPU_METER_STEAL]   = 0.0;
+      v[CPU_METER_GUEST]   = 0.0;
+      v[CPU_METER_IOWAIT]  = 0.0;
+      v[CPU_METER_FREQUENCY] = NAN;
+      this->curItems = 8;
+      totalPercent = v[0] + v[1] + v[2] + v[3];
+   } else {
+      v[2] = cpuData->sysAllPeriod / total * 100.0;
+      v[3] = 0.0; // No steal nor guest on NetBSD
+      totalPercent = v[0] + v[1] + v[2];
+      this->curItems = 4;
+   }
+
+   totalPercent = CLAMP(totalPercent, 0.0, 100.0);
+
+   v[CPU_METER_FREQUENCY] = cpuData->frequency;
+   v[CPU_METER_TEMPERATURE] = NAN;
+
+   return totalPercent;
+}
+
+void Platform_setMemoryValues(Meter* this) {
+   const ProcessList* pl = this->pl;
+   this->total = pl->totalMem;
+   this->values[MEMORY_METER_USED] = pl->usedMem;
+   this->values[MEMORY_METER_BUFFERS] = pl->buffersMem;
+   // this->values[MEMORY_METER_SHARED] = "shared memory, like tmpfs and shm"
+   this->values[MEMORY_METER_CACHE] = pl->cachedMem;
+   // this->values[MEMORY_METER_AVAILABLE] = "available memory"
+}
+
+void Platform_setSwapValues(Meter* this) {
+   const ProcessList* pl = this->pl;
+   this->total = pl->totalSwap;
+   this->values[SWAP_METER_USED] = pl->usedSwap;
+   this->values[SWAP_METER_CACHE] = NAN;
+}
+
+char* Platform_getProcessEnv(pid_t pid) {
+   char errbuf[_POSIX2_LINE_MAX];
+   char* env;
+   char** ptr;
+   int count;
+   kvm_t* kt;
+   const struct kinfo_proc2* kproc;
+   size_t capacity = 4096, size = 0;
+
+   if ((kt = kvm_openfiles(NULL, NULL, NULL, KVM_NO_FILES, errbuf)) == NULL) {
+      return NULL;
+   }
+
+   if ((kproc = kvm_getproc2(kt, KERN_PROC_PID, pid, sizeof(struct kinfo_proc2), &count)) == NULL) {
+      (void) kvm_close(kt);
+      return NULL;
+   }
+
+   if ((ptr = kvm_getenvv2(kt, kproc, 0)) == NULL) {
+      (void) kvm_close(kt);
+      return NULL;
+   }
+
+   env = xMalloc(capacity);
+   for (char** p = ptr; *p; p++) {
+      size_t len = strlen(*p) + 1;
+
+      while (size + len > capacity) {
+         if (capacity > (SIZE_MAX / 2)) {
+            free(env);
+            env = NULL;
+            goto end;
+         }
+
+         capacity *= 2;
+         env = xRealloc(env, capacity);
+      }
+
+      String_safeStrncpy(env + size, *p, len);
+      size += len;
+   }
+
+   if (size < 2 || env[size - 1] || env[size - 2]) {
+      if (size + 2 < capacity)
+         env = xRealloc(env, capacity + 2);
+      env[size] = 0;
+      env[size + 1] = 0;
+   }
+
+end:
+   (void) kvm_close(kt);
+   return env;
+}
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid) {
+   (void)pid;
+   return NULL;
+}
+
+bool Platform_getDiskIO(DiskIOData* data) {
+   const int mib[] = { CTL_HW, HW_IOSTATS, sizeof(struct io_sysctl) };
+   struct io_sysctl* iostats = NULL;
+   size_t size = 0;
+
+   for (int retry = 3; retry > 0; retry--) {
+      /* get the size of the IO statistic array */
+      if (sysctl(mib, __arraycount(mib), iostats, &size, NULL, 0) < 0)
+         CRT_fatalError("Unable to get size of io_sysctl");
+
+      if (size == 0) {
+         free(iostats);
+         return false;
+      }
+
+      iostats = xRealloc(iostats, size);
+
+      errno = 0;
+
+      if (sysctl(mib, __arraycount(mib), iostats, &size, NULL, 0) == 0)
+         break;
+
+      if (errno != ENOMEM)
+         CRT_fatalError("Unable to get disk IO statistics");
+   }
+
+   if (errno == ENOMEM)
+      CRT_fatalError("Unable to get disk IO statistics");
+
+   uint64_t bytesReadSum = 0;
+   uint64_t bytesWriteSum = 0;
+   uint64_t busyTimeSum = 0;
+
+   for (size_t i = 0, count = size / sizeof(struct io_sysctl); i < count; i++) {
+      /* ignore NFS activity */
+      if (iostats[i].type != IOSTAT_DISK)
+         continue;
+
+      bytesReadSum += iostats[i].rbytes;
+      bytesWriteSum += iostats[i].wbytes;
+      busyTimeSum += iostats[i].busysum_usec;
+   }
+
+   data->totalBytesRead = bytesReadSum;
+   data->totalBytesWritten = bytesWriteSum;
+   data->totalMsTimeSpend = busyTimeSum / 1000;
+
+   free(iostats);
+   return true;
+}
+
+bool Platform_getNetworkIO(NetworkIOData* data) {
+   struct ifaddrs* ifaddrs = NULL;
+
+   if (getifaddrs(&ifaddrs) != 0)
+      return false;
+
+   for (const struct ifaddrs* ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
+      if (!ifa->ifa_addr)
+         continue;
+      if (ifa->ifa_addr->sa_family != AF_LINK)
+         continue;
+      if (ifa->ifa_flags & IFF_LOOPBACK)
+         continue;
+
+      const struct if_data* ifd = (const struct if_data *)ifa->ifa_data;
+
+      data->bytesReceived += ifd->ifi_ibytes;
+      data->packetsReceived += ifd->ifi_ipackets;
+      data->bytesTransmitted += ifd->ifi_obytes;
+      data->packetsTransmitted += ifd->ifi_opackets;
+   }
+
+   freeifaddrs(ifaddrs);
+   return true;
+}
+
+void Platform_getBattery(double* percent, ACPresence* isOnAC) {
+   prop_dictionary_t dict, fields, props;
+   prop_object_t device, class;
+
+   intmax_t totalCharge = 0;
+   intmax_t totalCapacity = 0;
+
+   *percent = NAN;
+   *isOnAC = AC_ERROR;
+
+   int fd = open(_PATH_SYSMON, O_RDONLY);
+   if (fd == -1)
+      goto error;
+
+   if (prop_dictionary_recv_ioctl(fd, ENVSYS_GETDICTIONARY, &dict) != 0)
+      goto error;
+
+   prop_object_iterator_t devIter = prop_dictionary_iterator(dict);
+   if (devIter == NULL)
+      goto error;
+
+   while ((device = prop_object_iterator_next(devIter)) != NULL) {
+      prop_object_t fieldsArray = prop_dictionary_get_keysym(dict, device);
+      if (fieldsArray == NULL)
+         goto error;
+
+      prop_object_iterator_t fieldsIter = prop_array_iterator(fieldsArray);
+      if (fieldsIter == NULL)
+         goto error;
+
+      bool isACAdapter = false;
+      bool isBattery = false;
+
+      /* only assume battery is not present if explicitly stated */
+      intmax_t isPresent = 1;
+      intmax_t isConnected = 0;
+      intmax_t curCharge = 0;
+      intmax_t maxCharge = 0;
+
+      while ((fields = prop_object_iterator_next(fieldsIter)) != NULL) {
+         props = prop_dictionary_get(fields, "device-properties");
+         if (props != NULL) {
+            class = prop_dictionary_get(props, "device-class");
+
+            if (prop_string_equals_string(class, "ac-adapter")) {
+               isACAdapter = true;
+            } else if (prop_string_equals_string(class, "battery")) {
+               isBattery = true;
+            }
+            continue;
+         }
+
+         prop_object_t curValue = prop_dictionary_get(fields, "cur-value");
+         prop_object_t maxValue = prop_dictionary_get(fields, "max-value");
+         prop_object_t descField = prop_dictionary_get(fields, "description");
+
+         if (descField == NULL || curValue == NULL)
+            continue;
+
+         if (prop_string_equals_string(descField, "connected")) {
+            isConnected = prop_number_signed_value(curValue);
+         } else if (prop_string_equals_string(descField, "present")) {
+            isPresent = prop_number_signed_value(curValue);
+         } else if (prop_string_equals_string(descField, "charge")) {
+            if (maxValue == NULL)
+               continue;
+            curCharge = prop_number_signed_value(curValue);
+            maxCharge = prop_number_signed_value(maxValue);
+         }
+      }
+
+      if (isBattery && isPresent) {
+         totalCharge += curCharge;
+         totalCapacity += maxCharge;
+      }
+
+      if (isACAdapter && *isOnAC != AC_PRESENT) {
+         *isOnAC = isConnected ? AC_PRESENT : AC_ABSENT;
+      }
+   }
+
+   *percent = ((double)totalCharge / (double)totalCapacity) * 100.0;
+
+error:
+   if (fd != -1)
+      close(fd);
+}
diff --git a/netbsd/Platform.h b/netbsd/Platform.h
new file mode 100644
index 0000000..0e53b45
--- /dev/null
+++ b/netbsd/Platform.h
@@ -0,0 +1,124 @@
+#ifndef HEADER_Platform
+#define HEADER_Platform
+/*
+htop - netbsd/Platform.h
+(C) 2014 Hisham H. Muhammad
+(C) 2015 Michael McConville
+(C) 2021 Santhosh Raju
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include "Action.h"
+#include "BatteryMeter.h"
+#include "DiskIOMeter.h"
+#include "Meter.h"
+#include "NetworkIOMeter.h"
+#include "Process.h"
+#include "ProcessLocksScreen.h"
+#include "SignalsPanel.h"
+#include "CommandLine.h"
+#include "generic/gettime.h"
+#include "generic/hostname.h"
+#include "generic/uname.h"
+
+
+/* There are no Long Options for NetBSD as of now. */
+#define PLATFORM_LONG_OPTIONS \
+   // End of list
+
+extern const ScreenDefaults Platform_defaultScreens[];
+
+extern const unsigned int Platform_numberOfDefaultScreens;
+
+/* see /usr/include/sys/signal.h */
+extern const SignalItem Platform_signals[];
+
+extern const unsigned int Platform_numberOfSignals;
+
+extern const MeterClass* const Platform_meterTypes[];
+
+bool Platform_init(void);
+
+void Platform_done(void);
+
+void Platform_setBindings(Htop_Action* keys);
+
+int Platform_getUptime(void);
+
+void Platform_getLoadAverage(double* one, double* five, double* fifteen);
+
+int Platform_getMaxPid(void);
+
+double Platform_setCPUValues(Meter* this, int cpu);
+
+void Platform_setMemoryValues(Meter* this);
+
+void Platform_setSwapValues(Meter* this);
+
+char* Platform_getProcessEnv(pid_t pid);
+
+FileLocks_ProcessData* Platform_getProcessLocks(pid_t pid);
+
+bool Platform_getDiskIO(DiskIOData* data);
+
+bool Platform_getNetworkIO(NetworkIOData* data);
+
+void Platform_getBattery(double* percent, ACPresence* isOnAC);
+
+static inline void Platform_getHostname(char* buffer, size_t size) {
+   Generic_hostname(buffer, size);
+}
+
+static inline void Platform_getRelease(char** string) {
+   *string = Generic_uname();
+}
+
+static inline void Platform_longOptionsUsage(ATTR_UNUSED const char* name) { }
+
+static inline CommandLineStatus Platform_getLongOption(ATTR_UNUSED int opt, ATTR_UNUSED int argc, ATTR_UNUSED char** argv) {
+   return STATUS_ERROR_EXIT;
+}
+
+static inline void Platform_gettime_realtime(struct timeval* tv, uint64_t* msec) {
+   Generic_gettime_realtime(tv, msec);
+}
+
+static inline void Platform_gettime_monotonic(uint64_t* msec) {
+   Generic_gettime_monotonic(msec);
+}
+
+static inline Hashtable* Platform_dynamicMeters(void) {
+   return NULL;
+}
+
+static inline void Platform_dynamicMetersDone(ATTR_UNUSED Hashtable* table) { }
+
+static inline void Platform_dynamicMeterInit(ATTR_UNUSED Meter* meter) { }
+
+static inline void Platform_dynamicMeterUpdateValues(ATTR_UNUSED Meter* meter) { }
+
+static inline void Platform_dynamicMeterDisplay(ATTR_UNUSED const Meter* meter, ATTR_UNUSED RichString* out) { }
+
+static inline Hashtable* Platform_dynamicColumns(void) {
+   return NULL;
+}
+
+static inline void Platform_dynamicColumnsDone(ATTR_UNUSED Hashtable* table) { }
+
+static inline const char* Platform_dynamicColumnInit(ATTR_UNUSED unsigned int key) {
+   return NULL;
+}
+
+static inline bool Platform_dynamicColumnWriteField(ATTR_UNUSED const Process* proc, ATTR_UNUSED RichString* str, ATTR_UNUSED unsigned int key) {
+   return false;
+}
+
+#endif
diff --git a/netbsd/ProcessField.h b/netbsd/ProcessField.h
new file mode 100644
index 0000000..87d4a69
--- /dev/null
+++ b/netbsd/ProcessField.h
@@ -0,0 +1,15 @@
+#ifndef HEADER_NetBSDProcessField
+#define HEADER_NetBSDProcessField
+/*
+htop - netbsd/ProcessField.h
+(C) 2021 htop dev team
+Released under the GNU GPLv2+, see the COPYING file
+in the source distribution for its full text.
+*/
+
+
+#define PLATFORM_PROCESS_FIELDS  \
+   // End of list
+
+
+#endif /* HEADER_NetBSDProcessField */
diff --git a/netbsd/README.md b/netbsd/README.md
new file mode 100644
index 0000000..ed7be0a
--- /dev/null
+++ b/netbsd/README.md
@@ -0,0 +1,32 @@
+NetBSD support in htop(1)
+===
+
+This implementation utilizes kvm_getprocs(3), sysctl(3), etc, eliminating the
+need for mount_procfs(8) with Linux compatibility enabled.
+
+The implementation was initially based on the OpenBSD support in htop(1).
+
+Notes on NetBSD curses
+---
+
+NetBSD is one of the last operating systems to use and maintain its own
+implementation of Curses.
+
+htop(1) can be compiled against either ncurses or NetBSD's curses(3).
+In order for NetBSD's libcurses to be used, htop(1) must be configured with
+`--disable-unicode`. This is necessary because htop(1) with Unicode enabled
+directly accesses ncurses's cchar_t struct, which has different contents
+in NetBSD's curses.
+
+Versions of libcurses in NetBSD 9 and prior have no mouse support
+(this is an ncurses extension). Newer versions contain no-op mouse functions
+for compatibility with ncurses.
+
+What needs improvement
+---
+
+* Kernel and userspace threads are not displayed or counted -
+  maybe look at NetBSD top(1).
+* Support for compiling using libcurses's Unicode support.
+* Support for fstat(1) (view open files, like lsof(8) on Linux).
+* Support for ktrace(1) (like strace(1) on Linux).