1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * A tiny 'top' utility.
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4 | *
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5 | * This is written specifically for the linux /proc/<PID>/stat(m)
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6 | * files format.
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7 |
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8 | * This reads the PIDs of all processes and their status and shows
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9 | * the status of processes (first ones that fit to screen) at given
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10 | * intervals.
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11 | *
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12 | * NOTES:
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13 | * - At startup this changes to /proc, all the reads are then
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14 | * relative to that.
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15 | *
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16 | * (C) Eero Tamminen <oak at welho dot com>
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17 | *
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18 | * Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
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19 | */
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20 |
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21 | /* Original code Copyrights */
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22 | /*
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23 | * Copyright (c) 1992 Branko Lankester
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24 | * Copyright (c) 1992 Roger Binns
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25 | * Copyright (C) 1994-1996 Charles L. Blake.
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26 | * Copyright (C) 1992-1998 Michael K. Johnson
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27 | * May be distributed under the conditions of the
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28 | * GNU Library General Public License
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29 | */
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30 |
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31 | #include "busybox.h"
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32 | #include <sys/types.h>
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33 | #include <stdio.h>
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34 | #include <stdlib.h>
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35 | #include <unistd.h>
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36 | #include <string.h>
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37 | #include <sys/ioctl.h>
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38 |
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39 | //#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE /* + 2k */
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40 |
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41 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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42 | #include <time.h>
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43 | #include <fcntl.h>
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44 | #include <netinet/in.h> /* htons */
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45 | #endif
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46 |
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47 |
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48 | typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
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49 |
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50 | static procps_status_t *top; /* Hehe */
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51 | static int ntop;
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52 |
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53 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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54 | static int pid_sort(procps_status_t *P, procps_status_t *Q)
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55 | {
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56 | return (Q->pid - P->pid);
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57 | }
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58 | #endif
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59 |
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60 | static int mem_sort(procps_status_t *P, procps_status_t *Q)
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61 | {
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62 | return (int)(Q->rss - P->rss);
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63 | }
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64 |
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65 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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66 |
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67 | #define sort_depth 3
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68 | static cmp_t sort_function[sort_depth];
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69 |
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70 | static int pcpu_sort(procps_status_t *P, procps_status_t *Q)
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71 | {
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72 | return (Q->pcpu - P->pcpu);
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73 | }
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74 |
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75 | static int time_sort(procps_status_t *P, procps_status_t *Q)
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76 | {
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77 | return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
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78 | }
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79 |
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80 | static int mult_lvl_cmp(void* a, void* b) {
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81 | int i, cmp_val;
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82 |
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83 | for (i = 0; i < sort_depth; i++) {
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84 | cmp_val = (*sort_function[i])(a, b);
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85 | if (cmp_val != 0)
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86 | return cmp_val;
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87 | }
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88 | return 0;
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89 | }
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90 |
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91 | /* This structure stores some critical information from one frame to
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92 | the next. mostly used for sorting. Added cumulative and resident fields. */
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93 | struct save_hist {
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94 | int ticks;
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95 | int pid;
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96 | };
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97 |
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98 | /*
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99 | * Calculates percent cpu usage for each task.
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100 | */
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101 |
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102 | static struct save_hist *prev_hist;
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103 | static int prev_hist_count;
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104 | /* static int hist_iterations; */
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105 |
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106 |
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107 | static unsigned total_pcpu;
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108 | /* static unsigned long total_rss; */
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109 |
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110 | struct jiffy_counts {
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111 | unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
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112 | unsigned long long total;
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113 | unsigned long long busy;
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114 | };
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115 | static struct jiffy_counts jif, prev_jif;
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116 |
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117 | static void get_jiffy_counts(void)
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118 | {
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119 | FILE* fp = bb_xfopen("stat", "r");
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120 | prev_jif = jif;
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121 | if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
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122 | &jif.usr,&jif.nic,&jif.sys,&jif.idle,
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123 | &jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
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124 | bb_error_msg_and_die("failed to read 'stat'");
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125 | }
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126 | fclose(fp);
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127 | jif.total = jif.usr + jif.nic + jif.sys + jif.idle
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128 | + jif.iowait + jif.irq + jif.softirq + jif.steal;
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129 | /* procps 2.x does not count iowait as busy time */
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130 | jif.busy = jif.total - jif.idle - jif.iowait;
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131 | }
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132 |
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133 | static void do_stats(void)
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134 | {
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135 | procps_status_t *cur;
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136 | int pid, total_time, i, last_i, n;
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137 | struct save_hist *new_hist;
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138 |
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139 | get_jiffy_counts();
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140 | total_pcpu = 0;
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141 | /* total_rss = 0; */
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142 | new_hist = xmalloc(sizeof(struct save_hist)*ntop);
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143 | /*
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144 | * Make a pass through the data to get stats.
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145 | */
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146 | /* hist_iterations = 0; */
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147 | i = 0;
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148 | for (n = 0; n < ntop; n++) {
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149 | cur = top + n;
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150 |
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151 | /*
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152 | * Calculate time in cur process. Time is sum of user time
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153 | * and system time
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154 | */
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155 | pid = cur->pid;
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156 | total_time = cur->stime + cur->utime;
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157 | new_hist[n].ticks = total_time;
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158 | new_hist[n].pid = pid;
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159 |
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160 | /* find matching entry from previous pass */
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161 | cur->pcpu = 0;
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162 | /* do not start at index 0, continue at last used one
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163 | * (brought hist_iterations from ~14000 down to 172) */
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164 | last_i = i;
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165 | if (prev_hist_count) do {
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166 | if (prev_hist[i].pid == pid) {
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167 | cur->pcpu = total_time - prev_hist[i].ticks;
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168 | break;
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169 | }
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170 | i = (i+1) % prev_hist_count;
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171 | /* hist_iterations++; */
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172 | } while (i != last_i);
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173 | total_pcpu += cur->pcpu;
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174 | /* total_rss += cur->rss; */
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175 | }
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176 |
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177 | /*
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178 | * Save cur frame's information.
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179 | */
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180 | free(prev_hist);
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181 | prev_hist = new_hist;
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182 | prev_hist_count = ntop;
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183 | }
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184 | #else
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185 | static cmp_t sort_function;
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186 | #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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187 |
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188 | /* display generic info (meminfo / loadavg) */
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189 | static unsigned long display_generic(int scr_width)
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190 | {
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191 | FILE *fp;
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192 | char buf[80];
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193 | char scrbuf[80];
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194 | char *end;
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195 | unsigned long total, used, mfree, shared, buffers, cached;
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196 | unsigned int needs_conversion = 1;
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197 |
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198 | /* read memory info */
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199 | fp = bb_xfopen("meminfo", "r");
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200 |
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201 | /*
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202 | * Old kernels (such as 2.4.x) had a nice summary of memory info that
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203 | * we could parse, however this is gone entirely in 2.6. Try parsing
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204 | * the old way first, and if that fails, parse each field manually.
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205 | *
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206 | * First, we read in the first line. Old kernels will have bogus
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207 | * strings we don't care about, whereas new kernels will start right
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208 | * out with MemTotal:
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209 | * -- PFM.
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210 | */
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211 | if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
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212 | fgets(buf, sizeof(buf), fp); /* skip first line */
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213 |
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214 | fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
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215 | &total, &used, &mfree, &shared, &buffers, &cached);
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216 | } else {
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217 | /*
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218 | * Revert to manual parsing, which incidentally already has the
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219 | * sizes in kilobytes. This should be safe for both 2.4 and
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220 | * 2.6.
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221 | */
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222 | needs_conversion = 0;
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223 |
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224 | fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
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225 |
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226 | /*
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227 | * MemShared: is no longer present in 2.6. Report this as 0,
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228 | * to maintain consistent behavior with normal procps.
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229 | */
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230 | if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
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231 | shared = 0;
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232 |
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233 | fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
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234 | fscanf(fp, "Cached: %lu %s\n", &cached, buf);
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235 |
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236 | used = total - mfree;
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237 | }
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238 | fclose(fp);
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239 |
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240 | /* read load average as a string */
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241 | fp = bb_xfopen("loadavg", "r");
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242 | buf[0] = '\0';
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243 | fgets(buf, sizeof(buf), fp);
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244 | end = strchr(buf, ' ');
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245 | if (end) end = strchr(end+1, ' ');
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246 | if (end) end = strchr(end+1, ' ');
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247 | if (end) *end = '\0';
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248 | fclose(fp);
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249 |
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250 | if (needs_conversion) {
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251 | /* convert to kilobytes */
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252 | used /= 1024;
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253 | mfree /= 1024;
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254 | shared /= 1024;
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255 | buffers /= 1024;
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256 | cached /= 1024;
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257 | total /= 1024;
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258 | }
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259 |
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260 | /* output memory info and load average */
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261 | /* clear screen & go to top */
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262 | if (scr_width > sizeof(scrbuf))
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263 | scr_width = sizeof(scrbuf);
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264 | snprintf(scrbuf, scr_width,
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265 | "Mem: %ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached",
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266 | used, mfree, shared, buffers, cached);
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267 | printf("\e[H\e[J%s\n", scrbuf);
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268 | snprintf(scrbuf, scr_width,
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269 | "Load average: %s (Status: S=sleeping R=running, W=waiting)", buf);
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270 | printf("%s\n", scrbuf);
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271 |
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272 | return total;
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273 | }
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274 |
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275 |
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276 | /* display process statuses */
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277 | static void display_status(int count, int scr_width)
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278 | {
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279 | enum {
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280 | bits_per_int = sizeof(int)*8
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281 | };
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282 |
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283 | procps_status_t *s = top;
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284 | char rss_str_buf[8];
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285 | unsigned long total_memory = display_generic(scr_width); /* or use total_rss? */
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286 | unsigned pmem_shift, pmem_scale;
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287 |
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288 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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289 | unsigned pcpu_shift, pcpu_scale;
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290 |
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291 | /* what info of the processes is shown */
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292 | printf("\e[7m%.*s\e[0m", scr_width,
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293 | " PID USER STATUS RSS PPID %CPU %MEM COMMAND");
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294 | #define MIN_WIDTH \
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295 | sizeof( " PID USER STATUS RSS PPID %CPU %MEM C")
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296 | #else
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297 | printf("\e[7m%.*s\e[0m", scr_width,
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298 | " PID USER STATUS RSS PPID %MEM COMMAND");
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299 | #define MIN_WIDTH \
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300 | sizeof( " PID USER STATUS RSS PPID %MEM C")
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301 | #endif
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302 |
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303 | /*
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304 | * MEM% = s->rss/MemTotal
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305 | */
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306 | pmem_shift = bits_per_int-11;
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307 | pmem_scale = 1000*(1U<<(bits_per_int-11)) / total_memory;
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308 | /* s->rss is in kb. we want (s->rss * pmem_scale) to never overflow */
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309 | while (pmem_scale >= 512) {
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310 | pmem_scale /= 4;
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311 | pmem_shift -= 2;
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312 | }
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313 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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314 | /*
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315 | * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
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316 | * (pcpu is delta of sys+user time between samples)
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317 | */
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318 | /* (jif.xxx - prev_jif.xxx) and s->pcpu are
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319 | * in 0..~64000 range (HZ*update_interval).
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320 | * we assume that unsigned is at least 32-bit.
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321 | */
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322 | pcpu_shift = 6;
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323 | pcpu_scale = (1000*64*(uint16_t)(jif.busy-prev_jif.busy) ? : 1);
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324 | while (pcpu_scale < (1U<<(bits_per_int-2))) {
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325 | pcpu_scale *= 4;
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326 | pcpu_shift += 2;
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327 | }
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328 | pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
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329 | /* we want (s->pcpu * pcpu_scale) to never overflow */
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330 | while (pcpu_scale >= 1024) {
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331 | pcpu_scale /= 4;
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332 | pcpu_shift -= 2;
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333 | }
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334 | /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
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335 | #endif
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336 |
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337 | while (count--) {
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338 | div_t pmem = div( (s->rss*pmem_scale) >> pmem_shift, 10);
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339 | int col = scr_width+1;
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340 | USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(div_t pcpu;)
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341 |
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342 | if (s->rss >= 100*1024)
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343 | sprintf(rss_str_buf, "%6ldM", s->rss/1024);
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344 | else
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345 | sprintf(rss_str_buf, "%7ld", s->rss);
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346 | USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu = div((s->pcpu*pcpu_scale) >> pcpu_shift, 10);)
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347 | col -= printf("\n%5d %-8s %s %s%6d%3u.%c" \
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348 | USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE("%3u.%c") " ",
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349 | s->pid, s->user, s->state, rss_str_buf, s->ppid,
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350 | USE_FEATURE_TOP_CPU_USAGE_PERCENTAGE(pcpu.quot, '0'+pcpu.rem,)
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351 | pmem.quot, '0'+pmem.rem);
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352 | if (col>0)
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353 | printf("%.*s", col, s->short_cmd);
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354 | /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
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355 | jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
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356 | s++;
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357 | }
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358 | /* printf(" %d", hist_iterations); */
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359 | putchar('\r');
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360 | fflush(stdout);
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361 | }
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362 |
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363 | static void clearmems(void)
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364 | {
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365 | free(top);
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366 | top = 0;
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367 | ntop = 0;
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368 | }
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369 |
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370 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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371 | #include <termios.h>
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372 | #include <signal.h>
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373 |
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374 |
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375 | static struct termios initial_settings;
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376 |
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377 | static void reset_term(void)
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378 | {
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379 | tcsetattr(0, TCSANOW, (void *) &initial_settings);
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380 | #ifdef CONFIG_FEATURE_CLEAN_UP
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381 | clearmems();
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382 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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383 | free(prev_hist);
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384 | #endif
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385 | #endif /* CONFIG_FEATURE_CLEAN_UP */
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386 | }
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387 |
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388 | static void sig_catcher(int sig ATTRIBUTE_UNUSED)
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389 | {
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390 | reset_term();
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391 | exit(1);
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392 | }
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393 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
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394 |
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395 |
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396 | int top_main(int argc, char **argv)
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397 | {
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398 | int opt, interval, lines, col;
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399 | char *sinterval;
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400 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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401 | struct termios new_settings;
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402 | struct timeval tv;
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403 | fd_set readfds;
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404 | unsigned char c;
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405 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
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406 |
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407 | /* do normal option parsing */
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408 | opt = bb_getopt_ulflags(argc, argv, "d:", &sinterval);
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409 | if ((opt & 1)) {
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410 | interval = atoi(sinterval);
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411 | } else {
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412 | /* Default update rate is 5 seconds */
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413 | interval = 5;
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414 | }
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415 |
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416 | /* change to /proc */
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417 | bb_xchdir("/proc");
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418 | #ifdef CONFIG_FEATURE_USE_TERMIOS
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419 | tcgetattr(0, (void *) &initial_settings);
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420 | memcpy(&new_settings, &initial_settings, sizeof(struct termios));
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421 | new_settings.c_lflag &= ~(ISIG | ICANON); /* unbuffered input */
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422 | /* Turn off echoing */
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423 | new_settings.c_lflag &= ~(ECHO | ECHONL);
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424 |
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425 | signal(SIGTERM, sig_catcher);
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426 | signal(SIGINT, sig_catcher);
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427 | tcsetattr(0, TCSANOW, (void *) &new_settings);
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428 | atexit(reset_term);
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429 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
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430 |
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431 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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432 | sort_function[0] = pcpu_sort;
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433 | sort_function[1] = mem_sort;
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434 | sort_function[2] = time_sort;
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435 | #else
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436 | sort_function = mem_sort;
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437 | #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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438 |
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439 | while (1) {
|
---|
440 | procps_status_t *p;
|
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441 |
|
---|
442 | /* Default to 25 lines - 5 lines for status */
|
---|
443 | lines = 24 - 3;
|
---|
444 | col = 79;
|
---|
445 | #ifdef CONFIG_FEATURE_USE_TERMIOS
|
---|
446 | get_terminal_width_height(0, &col, &lines);
|
---|
447 | if (lines < 5 || col < MIN_WIDTH) {
|
---|
448 | sleep(interval);
|
---|
449 | continue;
|
---|
450 | }
|
---|
451 | lines -= 3;
|
---|
452 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
|
---|
453 |
|
---|
454 | /* read process IDs & status for all the processes */
|
---|
455 | while ((p = procps_scan(0)) != 0) {
|
---|
456 | int n = ntop;
|
---|
457 |
|
---|
458 | top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
|
---|
459 | memcpy(top + n, p, sizeof(procps_status_t));
|
---|
460 | }
|
---|
461 | if (ntop == 0) {
|
---|
462 | bb_error_msg_and_die("Can't find process info in /proc");
|
---|
463 | }
|
---|
464 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
465 | if (!prev_hist_count) {
|
---|
466 | do_stats();
|
---|
467 | sleep(1);
|
---|
468 | clearmems();
|
---|
469 | continue;
|
---|
470 | }
|
---|
471 | do_stats();
|
---|
472 | qsort(top, ntop, sizeof(procps_status_t), (void*)mult_lvl_cmp);
|
---|
473 | #else
|
---|
474 | qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
|
---|
475 | #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
---|
476 | opt = lines;
|
---|
477 | if (opt > ntop) {
|
---|
478 | opt = ntop;
|
---|
479 | }
|
---|
480 | /* show status for each of the processes */
|
---|
481 | display_status(opt, col);
|
---|
482 | #ifdef CONFIG_FEATURE_USE_TERMIOS
|
---|
483 | tv.tv_sec = interval;
|
---|
484 | tv.tv_usec = 0;
|
---|
485 | FD_ZERO(&readfds);
|
---|
486 | FD_SET(0, &readfds);
|
---|
487 | select(1, &readfds, NULL, NULL, &tv);
|
---|
488 | if (FD_ISSET(0, &readfds)) {
|
---|
489 | if (read(0, &c, 1) <= 0) { /* signal */
|
---|
490 | return EXIT_FAILURE;
|
---|
491 | }
|
---|
492 | if (c == 'q' || c == initial_settings.c_cc[VINTR])
|
---|
493 | break;
|
---|
494 | if (c == 'M') {
|
---|
495 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
496 | sort_function[0] = mem_sort;
|
---|
497 | sort_function[1] = pcpu_sort;
|
---|
498 | sort_function[2] = time_sort;
|
---|
499 | #else
|
---|
500 | sort_function = mem_sort;
|
---|
501 | #endif
|
---|
502 | }
|
---|
503 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
504 | if (c == 'P') {
|
---|
505 | sort_function[0] = pcpu_sort;
|
---|
506 | sort_function[1] = mem_sort;
|
---|
507 | sort_function[2] = time_sort;
|
---|
508 | }
|
---|
509 | if (c == 'T') {
|
---|
510 | sort_function[0] = time_sort;
|
---|
511 | sort_function[1] = mem_sort;
|
---|
512 | sort_function[2] = pcpu_sort;
|
---|
513 | }
|
---|
514 | #endif
|
---|
515 | if (c == 'N') {
|
---|
516 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
517 | sort_function[0] = pid_sort;
|
---|
518 | #else
|
---|
519 | sort_function = pid_sort;
|
---|
520 | #endif
|
---|
521 | }
|
---|
522 | }
|
---|
523 | #else
|
---|
524 | sleep(interval);
|
---|
525 | #endif /* CONFIG_FEATURE_USE_TERMIOS */
|
---|
526 | clearmems();
|
---|
527 | }
|
---|
528 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
529 | clearmems();
|
---|
530 | putchar('\n');
|
---|
531 | return EXIT_SUCCESS;
|
---|
532 | }
|
---|