changeset 1079:f4f543ff8490

top submitted by Ashwini Sharma
author Rob Landley <rob@landley.net>
date Sun, 06 Oct 2013 03:12:48 -0500
parents 7b6fbc0475d8
children 12246ab3fd9c
files toys/pending/top.c
diffstat 1 files changed, 853 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/pending/top.c	Sun Oct 06 03:12:48 2013 -0500
@@ -0,0 +1,853 @@
+/* top.c - Provide a view of process activity in real time.
+ *
+ * Copyright 2013 Bilal Qureshi <bilal.jmi@gmail.com>
+ * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
+ * Copyright 2013 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard
+
+USE_TOP(NEWTOY(top, ">0d#=3n#<1mb", TOYFLAG_USR|TOYFLAG_BIN))
+
+config TOP
+  bool "top"
+  default n
+  help
+    
+    Usage: top [-mb] [ -d seconds ] [ -n iterations ]
+
+    Provide a view of process activity in real time.
+    Keys
+       N/M/P/T show CPU usage, sort by pid/mem/cpu/time
+       S       show memory
+       R       reverse sort
+       H       toggle threads
+       C,1     toggle SMP
+       Q,^C    exit
+
+    Options
+       -n Iterations before exiting
+       -d Delay between updates
+       -m Same as 's' key
+       -b Batch mode
+*/
+
+#define FOR_top
+#include "toys.h"
+#include <signal.h>
+#include <poll.h>
+
+GLOBALS(
+  long iterations;
+  long delay;
+
+  long cmp_field;
+  long reverse;
+  long rows;
+  long smp;
+  long threads;
+  long m_flag;
+  long num_new_procs;
+  long scroll_offset;
+  struct termios inf;
+)
+
+#define PROC_NAME_LEN 512 //For long cmdline.
+#define INIT_PROCS 50
+
+struct cpu_info {
+  long unsigned utime, ntime, stime, itime;
+  long unsigned iowtime, irqtime, sirqtime, steal;
+  unsigned long long total;
+};
+
+enum CODE{
+  KEY_UP = 0x100, KEY_DOWN, KEY_HOME,
+  KEY_END, KEY_PAGEUP, KEY_PAGEDN,
+};
+
+struct keycode_map_s {
+  char *key;
+  int code;
+};
+
+struct proc_info {
+  struct proc_info *next;
+  pid_t pid, ppid;
+  uid_t uid;
+  char name[PROC_NAME_LEN];
+  char tname[PROC_NAME_LEN];
+  char state[4];
+  int prs;
+  unsigned long utime, stime, delta_utime, delta_stime, delta_time;
+  unsigned long vss, vssrw, rss, rss_shr, drt, drt_shr, stack;
+};
+
+static struct proc_info *free_procs, **old_procs, **new_procs;
+static struct cpu_info old_cpu[10], new_cpu[10]; //1 total, 8 cores, 1 null
+static int (*proc_cmp)(const void *a, const void *b);
+
+static struct proc_info *find_old_proc(pid_t pid) 
+{
+  int i;
+
+  for (i = 0; old_procs && old_procs[i]; i++)
+    if (old_procs[i]->pid == pid) return old_procs[i];
+
+  return NULL;
+}
+
+static void read_stat(char *filename, struct proc_info *proc) 
+{
+  int nice;
+  FILE *file;
+  char *open_paren, *close_paren;
+
+  if (!(file = fopen(filename, "r"))) return;
+  fgets(toybuf, sizeof(toybuf), file);
+  fclose(file);
+
+  // Split at first '(' and last ')' to get process name.
+  open_paren = strchr(toybuf, '(');
+  close_paren = strrchr(toybuf, ')');
+  if (!open_paren || !close_paren) return;
+
+  *open_paren = *close_paren = '\0';
+  snprintf(proc->tname, PROC_NAME_LEN, "[%s]",open_paren + 1);
+
+  // Scan rest of string.
+  sscanf(close_paren + 1, " %c %d %*d %*d %*d %*d %*d %*d %*d %*d %*d "
+      "%lu %lu %*d %*d %*d %d %*d %*d %*d %lu %ld "
+      "%*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %d",
+      &proc->state[0], &proc->ppid, &proc->utime, &proc->stime, &nice, 
+      &proc->vss, &proc->rss, &proc->prs);
+  if (!proc->vss && proc->state[0] != 'Z') proc->state[1] = 'W';
+  else proc->state[1] = ' ';
+  if (nice < 0 ) proc->state[2] = '<';
+  else if (nice) proc->state[2] = 'N';
+  else proc->state[2] = ' ';
+}
+
+static void read_status(char *filename, struct proc_info *proc) 
+{
+  FILE *file;
+
+  if (!(file = fopen(filename, "r"))) return;
+  while (fgets(toybuf, sizeof(toybuf), file)) 
+    if (sscanf(toybuf, "Uid: %u", &(proc->uid)) == 1) break;
+
+  fclose(file);
+}
+
+static void read_cmdline(char *filename, struct proc_info *proc) 
+{
+  int fd, len, rbytes = 0;
+  char *ch, *base, tname[PROC_NAME_LEN];
+
+  if ((fd = open(filename, O_RDONLY)) == -1) return;
+  rbytes = readall(fd, toybuf, sizeof(toybuf));
+  close(fd);
+  if (rbytes <= 0) {
+    strcpy(proc->name, proc->tname);
+    return;
+  }
+  toybuf[rbytes] = '\0';
+  while (--rbytes >= 0 && toybuf[rbytes] == '\0') continue;
+
+  snprintf(tname, PROC_NAME_LEN, "%s", proc->tname+1);
+  tname[strlen(tname) - 1] = '\0';
+  ch = strchr(toybuf, ' ');
+  if (ch) *ch = '\0';
+  base = strrchr(toybuf, '/');
+  if (base) base++;
+  else base = toybuf;
+
+  for (; rbytes >= 0; rbytes--)
+    if ((unsigned char)toybuf[rbytes] < ' ') toybuf[rbytes] = ' ';
+
+  if (*base == '-') base++;
+  len = strlen(tname);
+  if (strncmp(base, tname, len)) {
+    len +=3; //{,}, \0
+    rbytes = strlen(toybuf);
+    memmove(toybuf+ len, toybuf, rbytes+1);
+    snprintf(toybuf, sizeof(toybuf), "{%s}", tname);
+    toybuf[len-1] = ' ';
+  } 
+  snprintf(proc->name, PROC_NAME_LEN, "%s", toybuf);
+}
+
+static void add_proc(int proc_num, struct proc_info *proc) 
+{
+  int i;
+
+  if (proc_num >= TT.num_new_procs-1) {
+    new_procs = xrealloc(new_procs, (INIT_PROCS + TT.num_new_procs) 
+        * sizeof(struct proc_info *));
+    for (i = TT.num_new_procs; i < (INIT_PROCS +  TT.num_new_procs); i++)
+      new_procs[i] = NULL;
+    TT.num_new_procs += INIT_PROCS;
+  }
+  new_procs[proc_num] = proc;
+}
+
+void signal_handler(int sig)
+{
+  tcsetattr(STDIN_FILENO, TCSANOW, &TT.inf);
+  xputc('\n');
+  signal(sig, SIG_DFL);
+  raise(sig);
+  _exit(sig | 128);
+}
+
+static int get_key_code(char *ch, int i)
+{  
+  static struct keycode_map_s type2[] = {
+    {"OA",KEY_UP}, {"OB",KEY_DOWN}, {"OH",KEY_HOME},
+    {"OF",KEY_END}, {"[A",KEY_UP}, {"[B",KEY_DOWN},
+    {"[H",KEY_HOME}, {"[F",KEY_END}, {NULL, 0}
+  };       
+
+  static struct keycode_map_s type3[] = {
+    {"[1~", KEY_HOME}, {"[4~", KEY_END}, {"[5~", KEY_PAGEUP},
+    {"[6~", KEY_PAGEDN}, {"[7~", KEY_HOME}, {"[8~", KEY_END},
+    {NULL, 0}
+  };
+  struct keycode_map_s *table, *keytable[3] = {type2, type3, NULL};
+  int j;
+
+  if ( i > 3 || i < 1) return -1; 
+
+  for (j=0; (table = keytable[j]); j++) {
+    while (table->key) {
+      if (!strncmp(ch, table->key, i)) break;
+      table++;
+    }
+    if (table->key) {
+      if (i == 1 || (i == 2 && j)) return 1;
+      return table->code;
+    }
+  }
+  return -1;
+}
+
+static int read_input(int delay)
+{
+  struct pollfd pfd[1];
+  int ret, fret = 0, cnt = 0, escproc = 0, timeout = delay * 1000;
+  char ch, seq[4] = {0,};
+  struct termios newf;
+
+  tcgetattr(0, &TT.inf);
+  if (toys.optflags & FLAG_b) {
+    sleep(delay);
+    return 0;
+  }
+  pfd[0].fd = 0;
+  pfd[0].events = POLLIN;
+
+  //prepare terminal for input, without Enter of Carriage return
+  memcpy(&newf, &TT.inf, sizeof(struct termios));
+  newf.c_lflag &= ~(ICANON | ECHO | ECHONL);
+  newf.c_cc[VMIN] = 1;
+  newf.c_cc[VTIME] = 0;
+  tcsetattr(0, TCSANOW, &newf);
+
+  while (1) {
+    if ((ret = poll(pfd, 1, timeout)) >= 0) break;
+    else {
+      if (timeout > 0) timeout--;
+      if (errno == EINTR) continue;
+      perror_exit("poll");
+    }
+  }
+
+  while (ret) {
+    if (read(STDIN_FILENO, &ch, 1) != 1) toys.optflags |= FLAG_b;
+    else if (ch == '\033' || escproc) {
+      int code;
+      //process ESC keys
+      if (!escproc) {
+        if (!poll(pfd, 1, 50)) break; //no more chars
+        escproc = 1;
+        continue;
+      }
+      seq[cnt++] = ch;
+      code = get_key_code(seq, cnt);
+      switch(code) {
+        case -1: //no match
+          fret = 0;
+          break;
+        case 1: //read more
+          continue;
+        default: // got the key
+          fret = code;
+          break;
+      }
+    } else if ((ch == TT.inf.c_cc[VINTR]) 
+        || (ch == TT.inf.c_cc[VEOF]))
+      fret = 'q';
+    else fret = ch | 0x20;
+    break;
+  }
+  tcsetattr(0, TCSANOW, &TT.inf);
+  return fret;
+}
+
+// Allocation for Processes
+static struct proc_info *alloc_proc(void) 
+{
+  struct proc_info *proc;
+
+  if (free_procs) {
+    proc = free_procs;
+    free_procs = free_procs->next;
+    memset(proc, 0, sizeof(*proc));
+  } else proc = xzalloc(sizeof(*proc));
+
+  return proc;
+}
+
+static void free_proc_list(struct proc_info *procs)
+{
+  struct proc_info *tmp = procs;
+  
+  for (;tmp; tmp = procs) {
+    procs = procs->next;
+    free(tmp);
+  }
+}
+
+// Free allocated Processes in order to avoid memory leaks
+static void free_proc(struct proc_info *proc) 
+{
+  proc->next = free_procs;
+  free_procs = proc;
+}
+
+static struct proc_info *add_new_proc(pid_t pid, pid_t tid)
+{
+  char filename[64];
+  struct proc_info *proc = alloc_proc();
+
+  proc->pid = (tid)? tid : pid;
+  if (!tid) {
+    sprintf(filename, "/proc/%d/stat", pid);
+    read_stat(filename, proc);
+    sprintf(filename, "/proc/%d/cmdline", pid);
+    read_cmdline(filename, proc);
+    sprintf(filename, "/proc/%d/status", pid);
+    read_status(filename, proc);
+  } else{
+    sprintf(filename, "/proc/%d/task/%d/stat", pid,tid);
+    read_stat(filename, proc);
+    sprintf(filename, "/proc/%d/task/%d/cmdline", pid, tid);
+    read_cmdline(filename, proc);
+  }
+  return proc;
+}
+
+static void read_smaps(pid_t pid, struct proc_info *p)
+{
+  FILE *fp;
+  char *line;
+  size_t len;
+  long long start, end, val, prvcl, prvdr, shrdr, shrcl;
+  int count;
+
+  p->vss = p->rss = 0;
+  start = end = val = prvcl = prvdr = shrdr = shrcl = 0;
+  sprintf(toybuf, "/proc/%u/smaps", pid);
+  if (!(fp = fopen(toybuf, "r"))) {
+    error_msg("No %ld\n", (long)pid);
+    return;
+  }
+  for (;;) {
+    int off;
+
+    line = 0;
+    if (0 >= getline(&line, &len, fp)) break;
+    count = sscanf(line, "%llx-%llx %s %*s %*s %*s %n",
+        &start, &end, toybuf, &off);
+
+    if (count == 3) {
+      end = end - start;
+      if (strncmp(line+off, "/dev/", 5) || !strcmp(line+off, "/dev/zero\n")) {
+        p->vss += end;
+        if (toybuf[1] == 'w') p->vssrw += end;
+      }
+      if (line[off] && !strncmp(line+off, "[stack]",7)) p->stack += end;
+    } else {
+      if (0<sscanf(line, "Private_Clean: %lld", &val)) prvcl += val;
+      if (0<sscanf(line, "Private_Dirty: %lld", &val)) prvdr += val;
+      if (0<sscanf(line, "Shared_Dirty: %lld", &val)) shrdr += val;
+      if (0<sscanf(line, "Shared_Clean: %lld", &val)) shrcl += val;
+    }
+    free(line);
+  }
+  free(line); //incase it broke out.
+  p->rss_shr = shrdr + shrcl;
+  p->drt = prvdr + shrdr;
+  p->drt_shr = shrdr;
+  p->rss = p->rss_shr + prvdr + prvcl;
+  fclose(fp);
+}
+
+static void read_procs(void) // Read Processes
+{
+  DIR *proc_dir, *thr_dir;
+  struct dirent *pid_dir, *t_dir;
+  struct proc_info *proc;
+  pid_t pid, tid;
+  int proc_num = 0;
+
+  proc_dir = opendir("/proc");
+  if (!proc_dir) perror_exit("Could not open /proc");
+
+  new_procs = xzalloc(INIT_PROCS * sizeof(struct proc_info *));
+  TT.num_new_procs = INIT_PROCS;
+
+  while ((pid_dir = readdir(proc_dir))) {
+    if (!isdigit(pid_dir->d_name[0])) continue;
+
+    pid = atoi(pid_dir->d_name);
+    proc = add_new_proc(pid, 0);
+    if (TT.m_flag) {
+      read_smaps(pid, proc);
+      if (!proc->vss) {
+        free(proc);
+        continue;
+      }
+    }
+    add_proc(proc_num++, proc);
+
+    if (TT.threads) {
+      char filename[64];
+      uid_t uid = proc->uid;
+
+      sprintf(filename,"/proc/%d/task",pid);
+      if ((thr_dir = opendir(filename))) {
+        while ((t_dir = readdir(thr_dir))) {
+          if (!isdigit(t_dir->d_name[0])) continue;   
+
+          tid = atoi(t_dir->d_name);
+          if (pid == tid) continue;
+          proc = add_new_proc(pid, tid);
+          proc->uid = uid; //child will have same uid as parent.
+          add_proc(proc_num++, proc);
+        }
+        closedir(thr_dir);
+      }
+    }
+  }
+
+  closedir(proc_dir);
+  TT.num_new_procs = proc_num;
+}
+
+//calculate percentage.
+static char* show_percent(long unsigned num, long unsigned den)
+{
+  long res;
+  static char ch, buff[12]={'\0'};
+
+  if(num > den) num = den;
+  res = (num * 100)/den;
+  sprintf(buff,"%ld", (num * 100)% den);
+  ch = *buff;
+  sprintf(buff, "%ld.%c",res, ch);
+  return buff;
+}
+
+static int print_header(struct sysinfo *info, unsigned int cols)
+{
+  int fd, j, k, rows =0;
+  long unsigned total, meminfo_cached, anon, meminfo_mapped,
+       meminfo_slab, meminfo_dirty, meminfo_writeback, swapT, swapF;
+  char *buff;
+
+  fd = xopen("/proc/meminfo", O_RDONLY);
+  while ((buff = get_line(fd))) {
+    if (!strncmp(buff, "Cached", 6))
+      sscanf(buff,"%*s %lu\n",&meminfo_cached);
+    else if (!strncmp(buff, "AnonPages", 9))
+      sscanf(buff,"%*s %lu\n",&anon);
+    else if (!strncmp(buff, "Mapped", 6))
+      sscanf(buff,"%*s %lu\n",&meminfo_mapped);
+    else if (!strncmp(buff, "Slab", 4))
+      sscanf(buff,"%*s %lu\n",&meminfo_slab);
+    else if (!strncmp(buff, "Dirty", 5))
+      sscanf(buff,"%*s %lu\n",&meminfo_dirty);
+    else if (!strncmp(buff, "Writeback", 9))
+      sscanf(buff,"%*s %lu\n",&meminfo_writeback);
+    else if (!strncmp(buff, "SwapTotal", 9))
+      sscanf(buff,"%*s %lu\n",&swapT);
+    else if (!strncmp(buff, "SwapFree", 8))
+      sscanf(buff,"%*s %lu\n",&swapF);
+    free(buff);
+  }
+  close(fd);
+
+  if (!(toys.optflags & FLAG_b)) printf("\033[H\033[J");
+
+  if (TT.m_flag){
+    sprintf(toybuf, "Mem total:%lu anon:%lu map:%lu free:%lu", 
+        ((info->totalram) >> 10), anon, meminfo_mapped,
+        ((info->freeram) >> 10));
+    printf("%.*s\n", cols, toybuf);
+
+    sprintf(toybuf, "slab:%lu buf:%lu cache:%lu dirty:%lu write:%lu",
+        meminfo_slab, ((info->bufferram) >>10), meminfo_cached,
+        meminfo_dirty,meminfo_writeback);
+    printf("%.*s\n", cols, toybuf);
+
+    sprintf(toybuf, "Swap total:%lu free:%lu",swapT, swapF);
+    printf("%.*s\n", cols, toybuf);
+    rows += 3;
+  } else {
+    sprintf(toybuf,"Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached", 
+        (info->totalram-info->freeram) >>10, (info->freeram) >>10, 
+        (info->sharedram) >>10, (info->bufferram) >>10, meminfo_cached);
+    printf("%.*s\n", cols, toybuf);
+
+    for (k = 1; new_cpu[k].total; k++) {
+      j = 0;
+      if (!TT.smp) { 
+        k = 0;
+        j = sprintf(toybuf,"CPU:");
+      } else j = sprintf(toybuf,"CPU%d:", k-1);
+
+      total = (new_cpu[k].total) - (old_cpu[k].total);
+      if (!total) total = 1; //avoid denominator as 0, FPE
+      j += sprintf(toybuf + j," %s%% usr", 
+          show_percent((new_cpu[k].utime - old_cpu[k].utime), total));
+      j += sprintf(toybuf+j," %s%% sys",
+          show_percent((new_cpu[k].stime - old_cpu[k].stime), total));
+      j += sprintf(toybuf+j," %s%% nic",
+          show_percent(new_cpu[k].ntime - old_cpu[k].ntime, total));
+      j += sprintf(toybuf+j," %s%% idle",
+          show_percent(new_cpu[k].itime - old_cpu[k].itime, total));
+      j += sprintf(toybuf+j," %s%% io",
+          show_percent((new_cpu[k].iowtime - old_cpu[k].iowtime), total));
+      j += sprintf(toybuf+j," %s%% irq",
+          show_percent(new_cpu[k].irqtime - old_cpu[k].irqtime, total));
+      j += sprintf(toybuf+j," %s%% sirq",
+          show_percent(new_cpu[k].sirqtime - old_cpu[k].sirqtime, total));
+      printf("%.*s\n", cols, toybuf);
+      if (!TT.smp) break;
+    }
+
+    if ((buff = readfile("/proc/loadavg", NULL, 0))) {
+      buff[strlen(buff) -1] = '\0'; //removing '\n' at end
+      sprintf(toybuf, "Load average: %s", buff);
+      printf("%.*s\n", cols, toybuf);
+      free(buff);
+    }
+    rows += 2 + ((TT.smp) ? k-1 : 1);
+  }
+  return rows;
+}
+
+static void print_procs(void) 
+{
+  int i, j = 0;
+  struct proc_info *old_proc, *proc;
+  long unsigned total_delta_time;
+  struct passwd *user;
+  char *user_str, user_buf[20];
+  struct sysinfo info;
+  unsigned int cols=0, rows =0;
+
+  terminal_size(&cols, &rows);
+  if (!rows){
+    rows = 24; //on serial consoles setting default
+    cols = 79;
+  }
+  if (toys.optflags & FLAG_b) rows = INT_MAX;
+  TT.rows = rows;
+
+  for (i = 0; i < TT.num_new_procs; i++) {
+    if (new_procs[i]) {
+      old_proc = find_old_proc(new_procs[i]->pid);
+      if (old_proc) {
+        new_procs[i]->delta_utime = new_procs[i]->utime - old_proc->utime;
+        new_procs[i]->delta_stime = new_procs[i]->stime - old_proc->stime;
+      } else {
+        new_procs[i]->delta_utime = 0;
+        new_procs[i]->delta_stime = 0;
+      }
+      new_procs[i]->delta_time = new_procs[i]->delta_utime 
+        + new_procs[i]->delta_stime;
+    }
+  }
+
+  total_delta_time = new_cpu[0].total - old_cpu[0].total;
+  if (!total_delta_time) total_delta_time = 1;
+
+  qsort(new_procs, TT.num_new_procs, sizeof(struct proc_info *), proc_cmp);
+
+  //Memory details
+  sysinfo(&info);
+  info.totalram *= info.mem_unit;
+  info.freeram *= info.mem_unit;
+  info.sharedram *= info.mem_unit;
+  info.bufferram *= info.mem_unit;
+
+  rows -= print_header(&info, cols);
+ 
+  if (TT.m_flag) {
+    sprintf(toybuf, "%5s %5s %5s %5s %5s %5s %5s %5s %s", "PID", "VSZ", "VSZRW",
+        "RSS", "(SHR)", "DIRTY", "(SHR)", "STACK", "COMMAND");
+    toybuf[11 + TT.cmp_field*6] = (TT.reverse)?'_':'^'; //11 for PID,VSZ fields
+  } else sprintf(toybuf, "%5s %5s %-8s %4s %5s %5s %4s %5s %s", "PID", "PPID", 
+      "USER", "STAT", "VSZ", "%VSZ", "CPU" , "%CPU", "COMMAND");
+
+  printf((toys.optflags & FLAG_b)?"%.*s\n":"\033[7m%.*s\033[0m\n",cols, toybuf);
+  rows--;
+  for (i = TT.scroll_offset; i < TT.num_new_procs; i++) {
+    j = 0;
+    proc = new_procs[i];
+
+    user  = getpwuid(proc->uid);
+    if (user && user->pw_name) {
+      user_str = user->pw_name;
+    } else {
+      snprintf(user_buf, 20, "%d", proc->uid);
+      user_str = user_buf;
+    }
+
+    if (!TT.m_flag )
+    {
+      float vss_percentage = (float)(proc->vss)/info.totalram * 100;
+
+      j = sprintf(toybuf, "%5d %5d %-8.8s %-4s",proc->pid, proc->ppid, user_str,
+          proc->state);
+
+      if ((proc->vss >> 10) >= 100000) 
+        j += sprintf(toybuf + j, " %4lum", ((proc->vss >> 10) >> 10));
+      else j += sprintf(toybuf+j, " %5lu", (proc->vss >> 10));
+
+      sprintf(toybuf + j," %5.1f %4d %5s %s", vss_percentage, proc->prs, 
+          show_percent(proc->delta_time, total_delta_time), 
+          ((proc->name[0])? proc->name : proc->tname));
+      printf("%.*s", cols, toybuf);
+    } else {
+      j = sprintf(toybuf, "%5d",proc->pid);
+
+      if ((proc->vss >> 10) >= 100000) 
+        j += sprintf(toybuf + j, " %4lum", ((proc->vss >> 10) >> 10));
+      else j += sprintf(toybuf+j, " %5lu", (proc->vss >> 10));
+      if ((proc->vssrw >>10) >= 100000)
+        j += sprintf(toybuf + j, " %4lum", ((proc->vssrw >> 10) >> 10));
+      else j += sprintf(toybuf+j, " %5lu", (proc->vssrw >> 10)); 
+      if (proc->rss >= 100000)
+        j += sprintf(toybuf + j, " %4lum", ((proc->rss >> 10)));
+      else j += sprintf(toybuf+j, " %5lu", proc->rss);
+      if (proc->rss_shr >= 100000)
+        j += sprintf(toybuf + j, " %4lum", (proc->rss_shr >> 10));
+      else j += sprintf(toybuf+j, " %5lu", proc->rss_shr);
+      if (proc->drt >= 100000)
+        j += sprintf(toybuf + j, " %4lum", (proc->drt >> 10));
+      else j += sprintf(toybuf+j, " %5lu", proc->drt);
+      if (proc->drt_shr >= 100000)
+        j += sprintf(toybuf + j, " %4lum", (proc->drt_shr >> 10));
+      else j += sprintf(toybuf+j, " %5lu", proc->drt_shr);
+      if ((proc->stack >>10) >= 100000)
+        j += sprintf(toybuf + j, " %4lum", ((proc->stack >> 10) >> 10));
+      else j += sprintf(toybuf+j, " %5lu", (proc->stack >> 10));
+      
+      sprintf(toybuf + j," %s",((proc->name[0])? proc->name : proc->tname));
+      printf("%.*s", cols, toybuf);
+    }
+    rows--;
+    if (!rows) {
+      xputc('\r');
+      break; //don't print any more process details.
+    } else xputc('\n');
+  }
+}
+
+/* 
+ * Free old processes(displayed in old iteration) in order to 
+ * avoid memory leaks
+ */
+static void free_procs_arr(struct proc_info **procs) 
+{
+  int i;
+  for (i = 0; procs && procs[i]; i++)
+      free_proc(procs[i]);
+
+  free(procs);
+}
+
+static int numcmp(long long a, long long b) 
+{
+  if (a < b) return (TT.reverse)?-1 : 1;
+  if (a > b) return (TT.reverse)?1 : -1;
+  return 0;
+}
+
+static int top_mem_cmp(const void *a, const void *b)
+{
+  char *pa, *pb;
+
+  int n = offsetof(struct proc_info, vss) + TT.cmp_field * sizeof(unsigned long);
+  pa = *((char **)a); pb = *((char **)b);
+  return numcmp(*(unsigned long*)(pa+n), *(unsigned long*)(pb+n));
+}
+
+static int proc_time_cmp(const void *a, const void *b) 
+{
+  struct proc_info *pa, *pb;
+
+  pa = *((struct proc_info **)a); pb = *((struct proc_info **)b);
+  return numcmp(pa->utime + pa->stime, pb->utime+pa->stime);
+}
+
+/*
+ * Function to compare CPU usgae % while displaying processes 
+ * according to CPU usage
+ */
+static int proc_cpu_cmp(const void *a, const void *b) 
+{
+  struct proc_info *pa, *pb;
+
+  pa = *((struct proc_info **)a); pb = *((struct proc_info **)b);
+  return numcmp(pa->delta_time, pb->delta_time);
+}
+
+/*
+ * Function to compare memory taking by a process at the time of 
+ * displaying processes according to Memory usage
+ */ 
+static int proc_vss_cmp(const void *a, const void *b) 
+{
+  struct proc_info *pa, *pb;
+
+  pa = *((struct proc_info **)a); pb = *((struct proc_info **)b);
+  return numcmp(pa->vss, pb->vss);
+}
+
+static int proc_pid_cmp(const void *a, const void *b) 
+{
+  struct proc_info *pa, *pb;
+
+  pa = *((struct proc_info **)a); pb = *((struct proc_info **)b);
+  return numcmp(pa->pid, pb->pid);
+}
+
+/* Read CPU stats for all the cores, assuming max 8 cores
+ * to be present here.
+ */
+static void read_cpu_stat()
+{
+  int i;
+  size_t len;
+  char *line = 0, *params = "%lu %lu %lu %lu %lu %lu %lu %lu";
+  FILE *fp = xfopen("/proc/stat", "r");
+
+  for (i = 0; i<=8 && getline(&line, &len, fp) > 0; i++) {
+    if (i) sprintf(toybuf, "cpu%d %s", i-1, params);
+    else sprintf(toybuf, "cpu  %s",  params);
+    len = sscanf(line, toybuf, &new_cpu[i].utime, &new_cpu[i].ntime, 
+        &new_cpu[i].stime, &new_cpu[i].itime, &new_cpu[i].iowtime, 
+        &new_cpu[i].irqtime, &new_cpu[i].sirqtime, &new_cpu[i].steal);
+    if (len == 8) 
+      new_cpu[i].total = new_cpu[i].utime + new_cpu[i].ntime + new_cpu[i].stime
+      + new_cpu[i].itime + new_cpu[i].iowtime + new_cpu[i].irqtime
+      + new_cpu[i].sirqtime + new_cpu[i].steal;
+
+    free(line);
+    line = 0;
+  }
+  fclose(fp);
+}
+
+void top_main(void )
+{
+  int get_key;
+
+  proc_cmp = &proc_cpu_cmp;
+  if ( TT.delay < 0)  TT.delay = 3;
+  if (toys.optflags & FLAG_m) {
+    proc_cmp = &top_mem_cmp;
+    TT.m_flag = 1;
+  }
+
+  sigatexit(signal_handler);
+  read_cpu_stat();
+  get_key = read_input(0);
+
+  while (!(toys.optflags & FLAG_n) || TT.iterations--) {
+    old_procs = new_procs;
+    memcpy(old_cpu, new_cpu, sizeof(old_cpu));
+    read_procs();
+    read_cpu_stat();
+    print_procs();
+    free_procs_arr(old_procs);
+    if ((toys.optflags & FLAG_n) && !TT.iterations) break;
+
+    get_key = read_input(TT.delay);
+    if (get_key == 'q') break;
+
+    switch(get_key) {
+      case 'n':
+        proc_cmp = &proc_pid_cmp;
+        TT.m_flag = 0;
+        break;
+      case 'h':
+        if (!TT.m_flag) TT.threads ^= 1;
+        break;
+      case 'm':
+        proc_cmp = &proc_vss_cmp;
+        TT.m_flag = 0;
+        break;
+      case 'r':
+        TT.reverse ^= 1;
+        break;
+      case 'c':
+      case '1':
+        TT.smp ^= 1;
+        break;
+      case 's':
+        TT.m_flag = 1;
+        TT.cmp_field = (TT.cmp_field + 1) % 7;//7 sort fields, vss,vssrw...
+        proc_cmp = &top_mem_cmp;
+        break;
+      case 'p':
+        proc_cmp = &proc_cpu_cmp;
+        TT.m_flag = 0;
+        break;
+      case 't':
+        proc_cmp = &proc_time_cmp;
+        TT.m_flag = 0;
+        break;
+      case KEY_UP:
+        TT.scroll_offset--;
+        break;
+      case KEY_DOWN:
+        TT.scroll_offset++;
+        break;
+      case KEY_HOME:
+        TT.scroll_offset = 0;
+        break;
+      case  KEY_END:
+        TT.scroll_offset = TT.num_new_procs - TT.rows/2;
+        break;
+      case KEY_PAGEUP:
+        TT.scroll_offset -= TT.rows/2;
+        break;
+      case KEY_PAGEDN: 
+        TT.scroll_offset += TT.rows/2;
+        break;
+    }
+    if (TT.scroll_offset >= TT.num_new_procs) TT.scroll_offset = TT.num_new_procs-1;
+    if (TT.scroll_offset < 0) TT.scroll_offset = 0;
+  }
+  xputc('\n');
+  if (CFG_TOYBOX_FREE) {
+    free_proc_list(free_procs);
+    free_procs = NULL;
+    free_procs_arr(new_procs);
+    free_proc_list(free_procs);
+  }
+}