[821] | 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 |
|
---|
| 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 |
|
---|
| 431 | #ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
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| 432 | sort_function[0] = pcpu_sort;
|
---|
| 433 | sort_function[1] = mem_sort;
|
---|
| 434 | sort_function[2] = time_sort;
|
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| 435 | #else
|
---|
| 436 | sort_function = mem_sort;
|
---|
| 437 | #endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
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| 438 |
|
---|
| 439 | while (1) {
|
---|
| 440 | procps_status_t *p;
|
---|
| 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 | }
|
---|