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 "libbb.h"
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32 |
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33 |
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34 | typedef struct top_status_t {
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35 | unsigned long vsz;
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36 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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37 | unsigned long ticks;
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38 | unsigned pcpu; /* delta of ticks */
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39 | #endif
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40 | unsigned pid, ppid;
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41 | unsigned uid;
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42 | char state[4];
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43 | char comm[COMM_LEN];
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44 | } top_status_t;
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45 |
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46 | typedef struct jiffy_counts_t {
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47 | unsigned long long usr,nic,sys,idle,iowait,irq,softirq,steal;
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48 | unsigned long long total;
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49 | unsigned long long busy;
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50 | } jiffy_counts_t;
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51 |
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52 | /* This structure stores some critical information from one frame to
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53 | the next. Used for finding deltas. */
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54 | typedef struct save_hist {
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55 | unsigned long ticks;
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56 | unsigned pid;
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57 | } save_hist;
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58 |
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59 | typedef int (*cmp_funcp)(top_status_t *P, top_status_t *Q);
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60 |
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61 | enum { SORT_DEPTH = 3 };
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62 |
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63 | struct globals {
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64 | top_status_t *top;
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65 | int ntop;
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66 | #if ENABLE_FEATURE_USE_TERMIOS
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67 | struct termios initial_settings;
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68 | #endif
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69 | #if !ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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70 | cmp_funcp sort_function;
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71 | #else
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72 | cmp_funcp sort_function[SORT_DEPTH];
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73 | struct save_hist *prev_hist;
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74 | int prev_hist_count;
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75 | jiffy_counts_t jif, prev_jif;
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76 | /* int hist_iterations; */
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77 | unsigned total_pcpu;
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78 | /* unsigned long total_vsz; */
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79 | #endif
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80 | };
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81 | #define G (*(struct globals*)&bb_common_bufsiz1)
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82 | #define top (G.top )
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83 | #define ntop (G.ntop )
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84 | #if ENABLE_FEATURE_USE_TERMIOS
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85 | #define initial_settings (G. initial_settings )
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86 | #endif
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87 | #define sort_function (G.sort_function )
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88 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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89 | #define prev_hist (G.prev_hist )
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90 | #define prev_hist_count (G.prev_hist_count )
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91 | #define jif (G.jif )
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92 | #define prev_jif (G.prev_jif )
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93 | #define total_pcpu (G.total_pcpu )
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94 | #endif
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95 |
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96 | #define OPT_BATCH_MODE (option_mask32 & 0x4)
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97 |
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98 |
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99 | #if ENABLE_FEATURE_USE_TERMIOS
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100 | static int pid_sort(top_status_t *P, top_status_t *Q)
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101 | {
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102 | /* Buggy wrt pids with high bit set */
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103 | /* (linux pids are in [1..2^15-1]) */
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104 | return (Q->pid - P->pid);
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105 | }
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106 | #endif
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107 |
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108 | static int mem_sort(top_status_t *P, top_status_t *Q)
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109 | {
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110 | /* We want to avoid unsigned->signed and truncation errors */
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111 | if (Q->vsz < P->vsz) return -1;
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112 | return Q->vsz != P->vsz; /* 0 if ==, 1 if > */
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113 | }
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114 |
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115 |
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116 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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117 |
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118 | static int pcpu_sort(top_status_t *P, top_status_t *Q)
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119 | {
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120 | /* Buggy wrt ticks with high bit set */
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121 | /* Affects only processes for which ticks overflow */
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122 | return (int)Q->pcpu - (int)P->pcpu;
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123 | }
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124 |
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125 | static int time_sort(top_status_t *P, top_status_t *Q)
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126 | {
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127 | /* We want to avoid unsigned->signed and truncation errors */
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128 | if (Q->ticks < P->ticks) return -1;
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129 | return Q->ticks != P->ticks; /* 0 if ==, 1 if > */
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130 | }
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131 |
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132 | static int mult_lvl_cmp(void* a, void* b)
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133 | {
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134 | int i, cmp_val;
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135 |
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136 | for (i = 0; i < SORT_DEPTH; i++) {
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137 | cmp_val = (*sort_function[i])(a, b);
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138 | if (cmp_val != 0)
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139 | return cmp_val;
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140 | }
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141 | return 0;
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142 | }
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143 |
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144 |
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145 | static void get_jiffy_counts(void)
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146 | {
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147 | FILE* fp = xfopen("stat", "r");
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148 | prev_jif = jif;
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149 | if (fscanf(fp, "cpu %lld %lld %lld %lld %lld %lld %lld %lld",
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150 | &jif.usr,&jif.nic,&jif.sys,&jif.idle,
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151 | &jif.iowait,&jif.irq,&jif.softirq,&jif.steal) < 4) {
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152 | bb_error_msg_and_die("failed to read /proc/stat");
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153 | }
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154 | fclose(fp);
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155 | jif.total = jif.usr + jif.nic + jif.sys + jif.idle
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156 | + jif.iowait + jif.irq + jif.softirq + jif.steal;
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157 | /* procps 2.x does not count iowait as busy time */
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158 | jif.busy = jif.total - jif.idle - jif.iowait;
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159 | }
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160 |
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161 |
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162 | static void do_stats(void)
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163 | {
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164 | top_status_t *cur;
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165 | pid_t pid;
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166 | int i, last_i, n;
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167 | struct save_hist *new_hist;
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168 |
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169 | get_jiffy_counts();
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170 | total_pcpu = 0;
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171 | /* total_vsz = 0; */
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172 | new_hist = xmalloc(sizeof(struct save_hist)*ntop);
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173 | /*
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174 | * Make a pass through the data to get stats.
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175 | */
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176 | /* hist_iterations = 0; */
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177 | i = 0;
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178 | for (n = 0; n < ntop; n++) {
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179 | cur = top + n;
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180 |
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181 | /*
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182 | * Calculate time in cur process. Time is sum of user time
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183 | * and system time
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184 | */
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185 | pid = cur->pid;
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186 | new_hist[n].ticks = cur->ticks;
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187 | new_hist[n].pid = pid;
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188 |
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189 | /* find matching entry from previous pass */
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190 | cur->pcpu = 0;
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191 | /* do not start at index 0, continue at last used one
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192 | * (brought hist_iterations from ~14000 down to 172) */
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193 | last_i = i;
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194 | if (prev_hist_count) do {
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195 | if (prev_hist[i].pid == pid) {
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196 | cur->pcpu = cur->ticks - prev_hist[i].ticks;
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197 | total_pcpu += cur->pcpu;
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198 | break;
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199 | }
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200 | i = (i+1) % prev_hist_count;
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201 | /* hist_iterations++; */
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202 | } while (i != last_i);
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203 | /* total_vsz += cur->vsz; */
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204 | }
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205 |
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206 | /*
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207 | * Save cur frame's information.
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208 | */
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209 | free(prev_hist);
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210 | prev_hist = new_hist;
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211 | prev_hist_count = ntop;
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212 | }
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213 | #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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214 |
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215 | #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS && ENABLE_FEATURE_TOP_DECIMALS
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216 | /* formats 7 char string (8 with terminating NUL) */
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217 | static char *fmt_100percent_8(char pbuf[8], unsigned value, unsigned total)
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218 | {
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219 | unsigned t;
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220 | if (value >= total) { /* 100% ? */
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221 | strcpy(pbuf, " 100% ");
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222 | return pbuf;
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223 | }
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224 | /* else generate " [N/space]N.N% " string */
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225 | value = 1000 * value / total;
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226 | t = value / 100;
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227 | value = value % 100;
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228 | pbuf[0] = ' ';
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229 | pbuf[1] = t ? t + '0' : ' ';
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230 | pbuf[2] = '0' + (value / 10);
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231 | pbuf[3] = '.';
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232 | pbuf[4] = '0' + (value % 10);
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233 | pbuf[5] = '%';
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234 | pbuf[6] = ' ';
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235 | pbuf[7] = '\0';
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236 | return pbuf;
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237 | }
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238 | #endif
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239 |
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240 | /* display generic info (meminfo / loadavg) */
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241 | static unsigned long display_generic(int scr_width)
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242 | {
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243 | FILE *fp;
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244 | char buf[80];
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245 | char scrbuf[80];
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246 | unsigned long total, used, mfree, shared, buffers, cached;
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247 | #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
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248 | unsigned total_diff;
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249 | #endif
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250 |
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251 | /* read memory info */
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252 | fp = xfopen("meminfo", "r");
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253 |
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254 | /*
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255 | * Old kernels (such as 2.4.x) had a nice summary of memory info that
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256 | * we could parse, however this is gone entirely in 2.6. Try parsing
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257 | * the old way first, and if that fails, parse each field manually.
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258 | *
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259 | * First, we read in the first line. Old kernels will have bogus
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260 | * strings we don't care about, whereas new kernels will start right
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261 | * out with MemTotal:
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262 | * -- PFM.
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263 | */
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264 | if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
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265 | fgets(buf, sizeof(buf), fp); /* skip first line */
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266 |
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267 | fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
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268 | &total, &used, &mfree, &shared, &buffers, &cached);
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269 | /* convert to kilobytes */
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270 | used /= 1024;
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271 | mfree /= 1024;
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272 | shared /= 1024;
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273 | buffers /= 1024;
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274 | cached /= 1024;
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275 | total /= 1024;
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276 | } else {
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277 | /*
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278 | * Revert to manual parsing, which incidentally already has the
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279 | * sizes in kilobytes. This should be safe for both 2.4 and
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280 | * 2.6.
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281 | */
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282 |
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283 | fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
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284 |
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285 | /*
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286 | * MemShared: is no longer present in 2.6. Report this as 0,
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287 | * to maintain consistent behavior with normal procps.
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288 | */
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289 | if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
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290 | shared = 0;
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291 |
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292 | fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
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293 | fscanf(fp, "Cached: %lu %s\n", &cached, buf);
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294 |
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295 | used = total - mfree;
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296 | }
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297 | fclose(fp);
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298 |
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299 | /* output memory info */
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300 | if (scr_width > sizeof(scrbuf))
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301 | scr_width = sizeof(scrbuf);
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302 | snprintf(scrbuf, scr_width,
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303 | "Mem: %luK used, %luK free, %luK shrd, %luK buff, %luK cached",
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304 | used, mfree, shared, buffers, cached);
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305 | /* clear screen & go to top */
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306 | printf(OPT_BATCH_MODE ? "%s\n" : "\e[H\e[J%s\n", scrbuf);
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307 |
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308 | #if ENABLE_FEATURE_TOP_CPU_GLOBAL_PERCENTS
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309 | /*
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310 | * xxx% = (jif.xxx - prev_jif.xxx) / (jif.total - prev_jif.total) * 100%
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311 | */
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312 | /* using (unsigned) casts to make operations cheaper */
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313 | total_diff = ((unsigned)(jif.total - prev_jif.total) ? : 1);
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314 | #if ENABLE_FEATURE_TOP_DECIMALS
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315 | /* Generated code is approx +0.3k */
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316 | #define CALC_STAT(xxx) char xxx[8]
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317 | #define SHOW_STAT(xxx) fmt_100percent_8(xxx, (unsigned)(jif.xxx - prev_jif.xxx), total_diff)
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318 | #define FMT "%s"
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319 | #else
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320 | #define CALC_STAT(xxx) unsigned xxx = 100 * (unsigned)(jif.xxx - prev_jif.xxx) / total_diff
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321 | #define SHOW_STAT(xxx) xxx
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322 | #define FMT "%4u%% "
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323 | #endif
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324 | { /* need block: CALC_STAT are declarations */
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325 | CALC_STAT(usr);
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326 | CALC_STAT(sys);
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327 | CALC_STAT(nic);
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328 | CALC_STAT(idle);
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329 | CALC_STAT(iowait);
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330 | CALC_STAT(irq);
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331 | CALC_STAT(softirq);
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332 | //CALC_STAT(steal);
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333 |
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334 | snprintf(scrbuf, scr_width,
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335 | /* Barely fits in 79 chars when in "decimals" mode. */
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336 | "CPU:"FMT"usr"FMT"sys"FMT"nice"FMT"idle"FMT"io"FMT"irq"FMT"softirq",
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337 | SHOW_STAT(usr), SHOW_STAT(sys), SHOW_STAT(nic), SHOW_STAT(idle),
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338 | SHOW_STAT(iowait), SHOW_STAT(irq), SHOW_STAT(softirq)
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339 | //, SHOW_STAT(steal) - what is this 'steal' thing?
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340 | // I doubt anyone wants to know it
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341 | );
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342 | }
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343 | puts(scrbuf);
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344 | #undef SHOW_STAT
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345 | #undef CALC_STAT
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346 | #undef FMT
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347 | #endif
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348 |
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349 | /* read load average as a string */
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350 | buf[0] = '\0';
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351 | open_read_close("loadavg", buf, sizeof("N.NN N.NN N.NN")-1);
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352 | buf[sizeof("N.NN N.NN N.NN")-1] = '\0';
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353 | snprintf(scrbuf, scr_width, "Load average: %s", buf);
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354 | puts(scrbuf);
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355 |
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356 | return total;
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357 | }
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358 |
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359 | /* display process statuses */
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360 | static void display_status(int count, int scr_width)
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361 | {
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362 | enum {
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363 | BITS_PER_INT = sizeof(int)*8
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364 | };
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365 |
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366 | top_status_t *s = top;
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367 | char vsz_str_buf[8];
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368 | unsigned long total_memory = display_generic(scr_width); /* or use total_vsz? */
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369 | /* xxx_shift and xxx_scale variables allow us to replace
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370 | * expensive divides with multiply and shift */
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371 | unsigned pmem_shift, pmem_scale, pmem_half;
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372 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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373 | unsigned pcpu_shift, pcpu_scale, pcpu_half;
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374 | unsigned busy_jifs;
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375 |
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376 | /* what info of the processes is shown */
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377 | printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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378 | " PID PPID USER STAT VSZ %MEM %CPU COMMAND");
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379 | #define MIN_WIDTH \
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380 | sizeof( " PID PPID USER STAT VSZ %MEM %CPU C")
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381 | #else
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382 |
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383 | /* !CPU_USAGE_PERCENTAGE */
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384 | printf(OPT_BATCH_MODE ? "%.*s" : "\e[7m%.*s\e[0m", scr_width,
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385 | " PID PPID USER STAT VSZ %MEM COMMAND");
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386 | #define MIN_WIDTH \
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387 | sizeof( " PID PPID USER STAT VSZ %MEM C")
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388 | #endif
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389 |
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390 | #if ENABLE_FEATURE_TOP_DECIMALS
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391 | #define UPSCALE 1000
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392 | #define CALC_STAT(name, val) div_t name = div((val), 10)
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393 | #define SHOW_STAT(name) name.quot, '0'+name.rem
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394 | #define FMT "%3u.%c"
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395 | #else
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396 | #define UPSCALE 100
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397 | #define CALC_STAT(name, val) unsigned name = (val)
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398 | #define SHOW_STAT(name) name
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399 | #define FMT "%4u%%"
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400 | #endif
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401 | /*
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402 | * MEM% = s->vsz/MemTotal
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403 | */
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404 | pmem_shift = BITS_PER_INT-11;
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405 | pmem_scale = UPSCALE*(1U<<(BITS_PER_INT-11)) / total_memory;
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406 | /* s->vsz is in kb. we want (s->vsz * pmem_scale) to never overflow */
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407 | while (pmem_scale >= 512) {
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408 | pmem_scale /= 4;
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409 | pmem_shift -= 2;
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410 | }
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411 | pmem_half = (1U << pmem_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
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412 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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413 | busy_jifs = jif.busy - prev_jif.busy;
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414 | /* This happens if there were lots of short-lived processes
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415 | * between two top updates (e.g. compilation) */
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416 | if (total_pcpu < busy_jifs) total_pcpu = busy_jifs;
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417 |
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418 | /*
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419 | * CPU% = s->pcpu/sum(s->pcpu) * busy_cpu_ticks/total_cpu_ticks
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420 | * (pcpu is delta of sys+user time between samples)
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421 | */
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422 | /* (jif.xxx - prev_jif.xxx) and s->pcpu are
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423 | * in 0..~64000 range (HZ*update_interval).
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424 | * we assume that unsigned is at least 32-bit.
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425 | */
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426 | pcpu_shift = 6;
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427 | pcpu_scale = (UPSCALE*64*(uint16_t)busy_jifs ? : 1);
|
---|
428 | while (pcpu_scale < (1U<<(BITS_PER_INT-2))) {
|
---|
429 | pcpu_scale *= 4;
|
---|
430 | pcpu_shift += 2;
|
---|
431 | }
|
---|
432 | pcpu_scale /= ( (uint16_t)(jif.total-prev_jif.total)*total_pcpu ? : 1);
|
---|
433 | /* we want (s->pcpu * pcpu_scale) to never overflow */
|
---|
434 | while (pcpu_scale >= 1024) {
|
---|
435 | pcpu_scale /= 4;
|
---|
436 | pcpu_shift -= 2;
|
---|
437 | }
|
---|
438 | pcpu_half = (1U << pcpu_shift) / (ENABLE_FEATURE_TOP_DECIMALS? 20 : 2);
|
---|
439 | /* printf(" pmem_scale=%u pcpu_scale=%u ", pmem_scale, pcpu_scale); */
|
---|
440 | #endif
|
---|
441 |
|
---|
442 | /* Ok, all prelim data is ready, go thru the list */
|
---|
443 | while (count-- > 0) {
|
---|
444 | int col = scr_width;
|
---|
445 | CALC_STAT(pmem, (s->vsz*pmem_scale + pmem_half) >> pmem_shift);
|
---|
446 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
447 | CALC_STAT(pcpu, (s->pcpu*pcpu_scale + pcpu_half) >> pcpu_shift);
|
---|
448 | #endif
|
---|
449 |
|
---|
450 | if (s->vsz >= 100*1024)
|
---|
451 | sprintf(vsz_str_buf, "%6ldM", s->vsz/1024);
|
---|
452 | else
|
---|
453 | sprintf(vsz_str_buf, "%7ld", s->vsz);
|
---|
454 | // PID PPID USER STAT VSZ %MEM [%CPU] COMMAND
|
---|
455 | col -= printf("\n" "%5u%6u %-8.8s %s%s" FMT
|
---|
456 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
457 | FMT
|
---|
458 | #endif
|
---|
459 | " ",
|
---|
460 | s->pid, s->ppid, get_cached_username(s->uid),
|
---|
461 | s->state, vsz_str_buf,
|
---|
462 | SHOW_STAT(pmem)
|
---|
463 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
464 | , SHOW_STAT(pcpu)
|
---|
465 | #endif
|
---|
466 | );
|
---|
467 | if (col > 0) {
|
---|
468 | char buf[col + 1];
|
---|
469 | read_cmdline(buf, col, s->pid, s->comm);
|
---|
470 | fputs(buf, stdout);
|
---|
471 | }
|
---|
472 | /* printf(" %d/%d %lld/%lld", s->pcpu, total_pcpu,
|
---|
473 | jif.busy - prev_jif.busy, jif.total - prev_jif.total); */
|
---|
474 | s++;
|
---|
475 | }
|
---|
476 | /* printf(" %d", hist_iterations); */
|
---|
477 | putchar(OPT_BATCH_MODE ? '\n' : '\r');
|
---|
478 | fflush(stdout);
|
---|
479 | }
|
---|
480 | #undef UPSCALE
|
---|
481 | #undef SHOW_STAT
|
---|
482 | #undef CALC_STAT
|
---|
483 | #undef FMT
|
---|
484 |
|
---|
485 |
|
---|
486 | static void clearmems(void)
|
---|
487 | {
|
---|
488 | clear_username_cache();
|
---|
489 | free(top);
|
---|
490 | top = 0;
|
---|
491 | ntop = 0;
|
---|
492 | }
|
---|
493 |
|
---|
494 |
|
---|
495 | #if ENABLE_FEATURE_USE_TERMIOS
|
---|
496 | #include <termios.h>
|
---|
497 | #include <signal.h>
|
---|
498 |
|
---|
499 | static void reset_term(void)
|
---|
500 | {
|
---|
501 | tcsetattr(0, TCSANOW, (void *) &initial_settings);
|
---|
502 | #if ENABLE_FEATURE_CLEAN_UP
|
---|
503 | clearmems();
|
---|
504 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
505 | free(prev_hist);
|
---|
506 | #endif
|
---|
507 | #endif /* FEATURE_CLEAN_UP */
|
---|
508 | }
|
---|
509 |
|
---|
510 | static void sig_catcher(int sig ATTRIBUTE_UNUSED)
|
---|
511 | {
|
---|
512 | reset_term();
|
---|
513 | exit(1);
|
---|
514 | }
|
---|
515 | #endif /* FEATURE_USE_TERMIOS */
|
---|
516 |
|
---|
517 |
|
---|
518 | int top_main(int argc, char **argv);
|
---|
519 | int top_main(int argc, char **argv)
|
---|
520 | {
|
---|
521 | int count, lines, col;
|
---|
522 | unsigned interval = 5; /* default update rate is 5 seconds */
|
---|
523 | unsigned iterations = UINT_MAX; /* 2^32 iterations by default :) */
|
---|
524 | char *sinterval, *siterations;
|
---|
525 | #if ENABLE_FEATURE_USE_TERMIOS
|
---|
526 | struct termios new_settings;
|
---|
527 | struct timeval tv;
|
---|
528 | fd_set readfds;
|
---|
529 | unsigned char c;
|
---|
530 | #endif /* FEATURE_USE_TERMIOS */
|
---|
531 |
|
---|
532 | interval = 5;
|
---|
533 |
|
---|
534 | /* do normal option parsing */
|
---|
535 | opt_complementary = "-";
|
---|
536 | getopt32(argv, "d:n:b", &sinterval, &siterations);
|
---|
537 | if (option_mask32 & 0x1) interval = xatou(sinterval); // -d
|
---|
538 | if (option_mask32 & 0x2) iterations = xatou(siterations); // -n
|
---|
539 | //if (option_mask32 & 0x4) // -b
|
---|
540 |
|
---|
541 | /* change to /proc */
|
---|
542 | xchdir("/proc");
|
---|
543 | #if ENABLE_FEATURE_USE_TERMIOS
|
---|
544 | tcgetattr(0, (void *) &initial_settings);
|
---|
545 | memcpy(&new_settings, &initial_settings, sizeof(struct termios));
|
---|
546 | /* unbuffered input, turn off echo */
|
---|
547 | new_settings.c_lflag &= ~(ISIG | ICANON | ECHO | ECHONL);
|
---|
548 |
|
---|
549 | signal(SIGTERM, sig_catcher);
|
---|
550 | signal(SIGINT, sig_catcher);
|
---|
551 | tcsetattr(0, TCSANOW, (void *) &new_settings);
|
---|
552 | atexit(reset_term);
|
---|
553 | #endif /* FEATURE_USE_TERMIOS */
|
---|
554 |
|
---|
555 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
556 | sort_function[0] = pcpu_sort;
|
---|
557 | sort_function[1] = mem_sort;
|
---|
558 | sort_function[2] = time_sort;
|
---|
559 | #else
|
---|
560 | sort_function = mem_sort;
|
---|
561 | #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
---|
562 |
|
---|
563 | while (1) {
|
---|
564 | procps_status_t *p = NULL;
|
---|
565 |
|
---|
566 | /* Default to 25 lines - 5 lines for status */
|
---|
567 | lines = 24 - 3 USE_FEATURE_TOP_CPU_GLOBAL_PERCENTS( - 1);
|
---|
568 | col = 79;
|
---|
569 | #if ENABLE_FEATURE_USE_TERMIOS
|
---|
570 | get_terminal_width_height(0, &col, &lines);
|
---|
571 | if (lines < 5 || col < MIN_WIDTH) {
|
---|
572 | sleep(interval);
|
---|
573 | continue;
|
---|
574 | }
|
---|
575 | lines -= 3 USE_FEATURE_TOP_CPU_GLOBAL_PERCENTS( + 1);
|
---|
576 | #endif /* FEATURE_USE_TERMIOS */
|
---|
577 |
|
---|
578 | /* read process IDs & status for all the processes */
|
---|
579 | while ((p = procps_scan(p, 0
|
---|
580 | | PSSCAN_PID
|
---|
581 | | PSSCAN_PPID
|
---|
582 | | PSSCAN_VSZ
|
---|
583 | | PSSCAN_STIME
|
---|
584 | | PSSCAN_UTIME
|
---|
585 | | PSSCAN_STATE
|
---|
586 | | PSSCAN_COMM
|
---|
587 | | PSSCAN_SID
|
---|
588 | | PSSCAN_UIDGID
|
---|
589 | ))) {
|
---|
590 | int n = ntop;
|
---|
591 | top = xrealloc(top, (++ntop) * sizeof(*top));
|
---|
592 | top[n].pid = p->pid;
|
---|
593 | top[n].ppid = p->ppid;
|
---|
594 | top[n].vsz = p->vsz;
|
---|
595 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
596 | top[n].ticks = p->stime + p->utime;
|
---|
597 | #endif
|
---|
598 | top[n].uid = p->uid;
|
---|
599 | strcpy(top[n].state, p->state);
|
---|
600 | strcpy(top[n].comm, p->comm);
|
---|
601 | }
|
---|
602 | if (ntop == 0) {
|
---|
603 | bb_error_msg_and_die("no process info in /proc");
|
---|
604 | }
|
---|
605 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
606 | if (!prev_hist_count) {
|
---|
607 | do_stats();
|
---|
608 | sleep(1);
|
---|
609 | clearmems();
|
---|
610 | continue;
|
---|
611 | }
|
---|
612 | do_stats();
|
---|
613 | /* TODO: we don't need to sort all 10000 processes, we need to find top 24! */
|
---|
614 | qsort(top, ntop, sizeof(top_status_t), (void*)mult_lvl_cmp);
|
---|
615 | #else
|
---|
616 | qsort(top, ntop, sizeof(top_status_t), (void*)sort_function);
|
---|
617 | #endif /* FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
---|
618 | count = lines;
|
---|
619 | if (OPT_BATCH_MODE || count > ntop) {
|
---|
620 | count = ntop;
|
---|
621 | }
|
---|
622 | /* show status for each of the processes */
|
---|
623 | display_status(count, col);
|
---|
624 | #if ENABLE_FEATURE_USE_TERMIOS
|
---|
625 | tv.tv_sec = interval;
|
---|
626 | tv.tv_usec = 0;
|
---|
627 | FD_ZERO(&readfds);
|
---|
628 | FD_SET(0, &readfds);
|
---|
629 | select(1, &readfds, NULL, NULL, &tv);
|
---|
630 | if (FD_ISSET(0, &readfds)) {
|
---|
631 | if (read(0, &c, 1) <= 0) { /* signal */
|
---|
632 | return EXIT_FAILURE;
|
---|
633 | }
|
---|
634 | if (c == 'q' || c == initial_settings.c_cc[VINTR])
|
---|
635 | break;
|
---|
636 | if (c == 'M') {
|
---|
637 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
638 | sort_function[0] = mem_sort;
|
---|
639 | sort_function[1] = pcpu_sort;
|
---|
640 | sort_function[2] = time_sort;
|
---|
641 | #else
|
---|
642 | sort_function = mem_sort;
|
---|
643 | #endif
|
---|
644 | }
|
---|
645 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
646 | if (c == 'P') {
|
---|
647 | sort_function[0] = pcpu_sort;
|
---|
648 | sort_function[1] = mem_sort;
|
---|
649 | sort_function[2] = time_sort;
|
---|
650 | }
|
---|
651 | if (c == 'T') {
|
---|
652 | sort_function[0] = time_sort;
|
---|
653 | sort_function[1] = mem_sort;
|
---|
654 | sort_function[2] = pcpu_sort;
|
---|
655 | }
|
---|
656 | #endif
|
---|
657 | if (c == 'N') {
|
---|
658 | #if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
---|
659 | sort_function[0] = pid_sort;
|
---|
660 | #else
|
---|
661 | sort_function = pid_sort;
|
---|
662 | #endif
|
---|
663 | }
|
---|
664 | }
|
---|
665 | if (!--iterations)
|
---|
666 | break;
|
---|
667 | #else
|
---|
668 | sleep(interval);
|
---|
669 | #endif /* FEATURE_USE_TERMIOS */
|
---|
670 | clearmems();
|
---|
671 | }
|
---|
672 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
673 | clearmems();
|
---|
674 | putchar('\n');
|
---|
675 | return EXIT_SUCCESS;
|
---|
676 | }
|
---|