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591 lines
15 KiB
C
591 lines
15 KiB
C
/*
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* A tiny 'top' utility.
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*
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* This is written specifically for the linux /proc/<PID>/stat(m)
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* files format.
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* This reads the PIDs of all processes and their status and shows
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* the status of processes (first ones that fit to screen) at given
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* intervals.
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*
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* NOTES:
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* - At startup this changes to /proc, all the reads are then
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* relative to that.
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*
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* (C) Eero Tamminen <oak at welho dot com>
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*
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* Rewritten by Vladimir Oleynik (C) 2002 <dzo@simtreas.ru>
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*/
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/* Original code Copyrights */
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/*
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* Copyright (c) 1992 Branko Lankester
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* Copyright (c) 1992 Roger Binns
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* Copyright (C) 1994-1996 Charles L. Blake.
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* Copyright (C) 1992-1998 Michael K. Johnson
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* May be distributed under the conditions of the
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* GNU Library General Public License
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include "busybox.h"
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//#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE /* + 2k */
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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#include <time.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <netinet/in.h> /* htons */
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#endif
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typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
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static procps_status_t *top; /* Hehe */
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static int ntop;
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#ifdef CONFIG_FEATURE_USE_TERMIOS
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static int pid_sort (procps_status_t *P, procps_status_t *Q)
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{
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return (Q->pid - P->pid);
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}
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#endif
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static int mem_sort (procps_status_t *P, procps_status_t *Q)
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{
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return (int)(Q->rss - P->rss);
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}
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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#define sort_depth 3
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static cmp_t sort_function[sort_depth];
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static int pcpu_sort (procps_status_t *P, procps_status_t *Q)
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{
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return (Q->pcpu - P->pcpu);
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}
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static int time_sort (procps_status_t *P, procps_status_t *Q)
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{
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return (int)((Q->stime + Q->utime) - (P->stime + P->utime));
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}
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static int mult_lvl_cmp(void* a, void* b) {
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int i, cmp_val;
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for(i = 0; i < sort_depth; i++) {
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cmp_val = (*sort_function[i])(a, b);
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if (cmp_val != 0)
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return cmp_val;
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}
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return 0;
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}
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/* This structure stores some critical information from one frame to
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the next. mostly used for sorting. Added cumulative and resident fields. */
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struct save_hist {
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int ticks;
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int pid;
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int utime;
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int stime;
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};
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/*
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* Calculates percent cpu usage for each task.
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*/
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static struct save_hist *save_history;
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static unsigned long Hertz;
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/***********************************************************************
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* Some values in /proc are expressed in units of 1/HZ seconds, where HZ
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* is the kernel clock tick rate. One of these units is called a jiffy.
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* The HZ value used in the kernel may vary according to hacker desire.
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* According to Linus Torvalds, this is not true. He considers the values
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* in /proc as being in architecture-dependent units that have no relation
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* to the kernel clock tick rate. Examination of the kernel source code
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* reveals that opinion as wishful thinking.
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*
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* In any case, we need the HZ constant as used in /proc. (the real HZ value
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* may differ, but we don't care) There are several ways we could get HZ:
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*
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* 1. Include the kernel header file. If it changes, recompile this library.
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* 2. Use the sysconf() function. When HZ changes, recompile the C library!
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* 3. Ask the kernel. This is obviously correct...
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*
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* Linus Torvalds won't let us ask the kernel, because he thinks we should
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* not know the HZ value. Oh well, we don't have to listen to him.
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* Someone smuggled out the HZ value. :-)
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*
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* This code should work fine, even if Linus fixes the kernel to match his
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* stated behavior. The code only fails in case of a partial conversion.
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*
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*/
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#define file_to_buf_bufsize 80
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static inline int file_to_buf(char *buf, const char *filename, int fd)
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{
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int sz;
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if (fd == -1) {
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fd = open(filename, O_RDONLY);
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if(fd == -1)
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bb_perror_msg_and_die("is /proc mounted?");
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} else {
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lseek(fd, 0L, SEEK_SET);
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}
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sz = read(fd, buf, file_to_buf_bufsize - 1);
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if (sz < 0) {
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bb_perror_msg_and_die("%s", filename);
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}
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buf[sz] = '\0';
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return fd;
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}
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static void init_Hertz_value(void)
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{
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unsigned long user_j, nice_j, sys_j, other_j; /* jiffies (clock ticks) */
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double up_1, up_2, seconds;
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unsigned long jiffies, h;
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char buf[80];
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int uptime_fd = -1;
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int stat_fd = -1;
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long smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF);
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if(smp_num_cpus<1) smp_num_cpus=1;
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do {
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uptime_fd = file_to_buf(buf, "uptime", uptime_fd);
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up_1 = strtod(buf, 0);
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stat_fd = file_to_buf(buf, "stat", stat_fd);
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sscanf(buf, "cpu %lu %lu %lu %lu", &user_j, &nice_j, &sys_j, &other_j);
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uptime_fd = file_to_buf(buf, "uptime", uptime_fd);
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up_2 = strtod(buf, 0);
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} while((long)( (up_2-up_1)*1000.0/up_1 )); /* want under 0.1% error */
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close(uptime_fd);
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close(stat_fd);
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jiffies = user_j + nice_j + sys_j + other_j;
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seconds = (up_1 + up_2) / 2;
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h = (unsigned long)( (double)jiffies/seconds/smp_num_cpus );
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/* actual values used by 2.4 kernels: 32 64 100 128 1000 1024 1200 */
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switch(h) {
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case 30 ... 34 : Hertz = 32; break; /* ia64 emulator */
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case 48 ... 52 : Hertz = 50; break;
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case 58 ... 62 : Hertz = 60; break;
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case 63 ... 65 : Hertz = 64; break; /* StrongARM /Shark */
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case 95 ... 105 : Hertz = 100; break; /* normal Linux */
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case 124 ... 132 : Hertz = 128; break; /* MIPS, ARM */
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case 195 ... 204 : Hertz = 200; break; /* normal << 1 */
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case 253 ... 260 : Hertz = 256; break;
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case 295 ... 304 : Hertz = 300; break; /* 3 cpus */
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case 393 ... 408 : Hertz = 400; break; /* normal << 2 */
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case 495 ... 504 : Hertz = 500; break; /* 5 cpus */
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case 595 ... 604 : Hertz = 600; break; /* 6 cpus */
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case 695 ... 704 : Hertz = 700; break; /* 7 cpus */
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case 790 ... 808 : Hertz = 800; break; /* normal << 3 */
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case 895 ... 904 : Hertz = 900; break; /* 9 cpus */
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case 990 ... 1010 : Hertz = 1000; break; /* ARM */
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case 1015 ... 1035 : Hertz = 1024; break; /* Alpha, ia64 */
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case 1095 ... 1104 : Hertz = 1100; break; /* 11 cpus */
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case 1180 ... 1220 : Hertz = 1200; break; /* Alpha */
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default:
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/* If 32-bit or big-endian (not Alpha or ia64), assume HZ is 100. */
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Hertz = (sizeof(long)==sizeof(int) || htons(999)==999) ? 100UL : 1024UL;
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}
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}
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static void do_stats(void)
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{
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struct timeval t;
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static struct timeval oldtime;
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struct timezone timez;
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float elapsed_time;
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procps_status_t *cur;
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int total_time, i, n;
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static int prev_count;
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int systime, usrtime, pid;
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struct save_hist *New_save_hist;
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/*
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* Finds the current time (in microseconds) and calculates the time
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* elapsed since the last update.
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*/
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gettimeofday(&t, &timez);
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elapsed_time = (t.tv_sec - oldtime.tv_sec)
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+ (float) (t.tv_usec - oldtime.tv_usec) / 1000000.0;
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oldtime.tv_sec = t.tv_sec;
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oldtime.tv_usec = t.tv_usec;
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New_save_hist = alloca(sizeof(struct save_hist)*ntop);
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/*
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* Make a pass through the data to get stats.
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*/
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for(n = 0; n < ntop; n++) {
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cur = top + n;
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/*
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* Calculate time in cur process. Time is sum of user time
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* (usrtime) plus system time (systime).
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*/
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systime = cur->stime;
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usrtime = cur->utime;
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pid = cur->pid;
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total_time = systime + usrtime;
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New_save_hist[n].ticks = total_time;
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New_save_hist[n].pid = pid;
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New_save_hist[n].stime = systime;
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New_save_hist[n].utime = usrtime;
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/* find matching entry from previous pass */
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for (i = 0; i < prev_count; i++) {
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if (save_history[i].pid == pid) {
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total_time -= save_history[i].ticks;
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systime -= save_history[i].stime;
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usrtime -= save_history[i].utime;
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break;
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}
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}
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/*
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* Calculate percent cpu time for cur task.
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*/
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i = (total_time * 10 * 100/Hertz) / elapsed_time;
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if (i > 999)
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i = 999;
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cur->pcpu = i;
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}
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/*
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* Save cur frame's information.
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*/
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free(save_history);
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save_history = memcpy(xmalloc(sizeof(struct save_hist)*n), New_save_hist,
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sizeof(struct save_hist)*n);
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prev_count = n;
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qsort(top, n, sizeof(procps_status_t), (void*)mult_lvl_cmp);
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}
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#else
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static cmp_t sort_function;
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#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
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/* display generic info (meminfo / loadavg) */
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static unsigned long display_generic(void)
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{
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FILE *fp;
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char buf[80];
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float avg1, avg2, avg3;
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unsigned long total, used, mfree, shared, buffers, cached;
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unsigned int needs_conversion = 1;
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/* read memory info */
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fp = bb_xfopen("meminfo", "r");
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/*
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* Old kernels (such as 2.4.x) had a nice summary of memory info that
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* we could parse, however this is gone entirely in 2.6. Try parsing
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* the old way first, and if that fails, parse each field manually.
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*
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* First, we read in the first line. Old kernels will have bogus
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* strings we don't care about, whereas new kernels will start right
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* out with MemTotal:
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* -- PFM.
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*/
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if (fscanf(fp, "MemTotal: %lu %s\n", &total, buf) != 2) {
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fgets(buf, sizeof(buf), fp); /* skip first line */
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fscanf(fp, "Mem: %lu %lu %lu %lu %lu %lu",
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&total, &used, &mfree, &shared, &buffers, &cached);
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} else {
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/*
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* Revert to manual parsing, which incidentally already has the
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* sizes in kilobytes. This should be safe for both 2.4 and
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* 2.6.
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*/
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needs_conversion = 0;
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fscanf(fp, "MemFree: %lu %s\n", &mfree, buf);
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/*
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* MemShared: is no longer present in 2.6. Report this as 0,
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* to maintain consistent behavior with normal procps.
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*/
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if (fscanf(fp, "MemShared: %lu %s\n", &shared, buf) != 2)
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shared = 0;
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fscanf(fp, "Buffers: %lu %s\n", &buffers, buf);
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fscanf(fp, "Cached: %lu %s\n", &cached, buf);
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used = total - mfree;
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}
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fclose(fp);
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/* read load average */
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fp = bb_xfopen("loadavg", "r");
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if (fscanf(fp, "%f %f %f", &avg1, &avg2, &avg3) != 3) {
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bb_error_msg_and_die("failed to read 'loadavg'");
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}
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fclose(fp);
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if (needs_conversion) {
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/* convert to kilobytes */
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used /= 1024;
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mfree /= 1024;
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shared /= 1024;
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buffers /= 1024;
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cached /= 1024;
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total /= 1024;
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}
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/* output memory info and load average */
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/* clear screen & go to top */
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printf("\e[H\e[J" "Mem: "
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"%ldK used, %ldK free, %ldK shrd, %ldK buff, %ldK cached\n",
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used, mfree, shared, buffers, cached);
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printf("Load average: %.2f, %.2f, %.2f "
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"(State: S=sleeping R=running, W=waiting)\n",
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avg1, avg2, avg3);
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return total;
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}
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/* display process statuses */
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static void display_status(int count, int col)
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{
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procps_status_t *s = top;
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char rss_str_buf[8];
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unsigned long total_memory = display_generic();
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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/* what info of the processes is shown */
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printf("\n\e[7m PID USER STATUS RSS PPID %%CPU %%MEM COMMAND\e[0m\n");
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#else
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printf("\n\e[7m PID USER STATUS RSS PPID %%MEM COMMAND\e[0m\n");
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#endif
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while (count--) {
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char *namecmd = s->short_cmd;
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int pmem;
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pmem = 1000.0 * s->rss / total_memory;
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if (pmem > 999) pmem = 999;
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if(s->rss > 10*1024)
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sprintf(rss_str_buf, "%6ldM", s->rss/1024);
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else
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sprintf(rss_str_buf, "%7ld", s->rss);
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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printf("%5d %-8s %s %s %5d %2d.%d %2u.%u ",
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s->pid, s->user, s->state, rss_str_buf, s->ppid,
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s->pcpu/10, s->pcpu%10, pmem/10, pmem%10);
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#else
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printf("%5d %-8s %s %s %5d %2u.%u ",
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s->pid, s->user, s->state, rss_str_buf, s->ppid,
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pmem/10, pmem%10);
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#endif
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if((int)strlen(namecmd) > col)
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namecmd[col] = 0;
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printf("%s", namecmd);
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if(count)
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putchar('\n');
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else
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fflush(stdout);
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s++;
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}
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}
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static void clearmems(void)
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{
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free(top);
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top = 0;
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ntop = 0;
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}
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#ifdef CONFIG_FEATURE_USE_TERMIOS
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#include <termios.h>
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#include <sys/time.h>
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#include <signal.h>
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static struct termios initial_settings;
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static void reset_term(void)
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{
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tcsetattr(0, TCSANOW, (void *) &initial_settings);
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#ifdef CONFIG_FEATURE_CLEAN_UP
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clearmems();
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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free(save_history);
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#endif
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#endif /* CONFIG_FEATURE_CLEAN_UP */
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}
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static void sig_catcher(int sig ATTRIBUTE_UNUSED)
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{
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reset_term();
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}
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#endif /* CONFIG_FEATURE_USE_TERMIOS */
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int top_main(int argc, char **argv)
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{
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int opt, interval, lines, col;
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char *sinterval;
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#ifdef CONFIG_FEATURE_USE_TERMIOS
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struct termios new_settings;
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struct timeval tv;
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fd_set readfds;
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unsigned char c;
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struct sigaction sa;
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#endif /* CONFIG_FEATURE_USE_TERMIOS */
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/* do normal option parsing */
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opt = bb_getopt_ulflags(argc, argv, "d:", &sinterval);
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if((opt & 1)) {
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interval = atoi(sinterval);
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} else {
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/* Default update rate is 5 seconds */
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interval = 5;
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}
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/* Default to 25 lines - 5 lines for status */
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lines = 25 - 5;
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/* Default CMD format size */
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#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
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col = 35 - 6;
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#else
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col = 35;
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#endif
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/* change to /proc */
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if (chdir("/proc") < 0) {
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bb_perror_msg_and_die("chdir('/proc')");
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}
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#ifdef CONFIG_FEATURE_USE_TERMIOS
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tcgetattr(0, (void *) &initial_settings);
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memcpy(&new_settings, &initial_settings, sizeof(struct termios));
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new_settings.c_lflag &= ~(ISIG | ICANON); /* unbuffered input */
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/* Turn off echoing */
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new_settings.c_lflag &= ~(ECHO | ECHONL);
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signal (SIGTERM, sig_catcher);
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sigaction (SIGTERM, (struct sigaction *) 0, &sa);
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sa.sa_flags |= SA_RESTART;
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sa.sa_flags &= ~SA_INTERRUPT;
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sigaction (SIGTERM, &sa, (struct sigaction *) 0);
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sigaction (SIGINT, &sa, (struct sigaction *) 0);
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tcsetattr(0, TCSANOW, (void *) &new_settings);
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atexit(reset_term);
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get_terminal_width_height(0, &col, &lines);
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if (lines > 4) {
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lines -= 4;
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
col = col - 80 + 35 - 6;
|
|
#else
|
|
col = col - 80 + 35;
|
|
#endif
|
|
}
|
|
#endif /* CONFIG_FEATURE_USE_TERMIOS */
|
|
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
sort_function[0] = pcpu_sort;
|
|
sort_function[1] = mem_sort;
|
|
sort_function[2] = time_sort;
|
|
#else
|
|
sort_function = mem_sort;
|
|
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
|
|
|
while (1) {
|
|
/* read process IDs & status for all the processes */
|
|
procps_status_t * p;
|
|
|
|
while ((p = procps_scan(0)) != 0) {
|
|
int n = ntop;
|
|
|
|
top = xrealloc(top, (++ntop)*sizeof(procps_status_t));
|
|
memcpy(top + n, p, sizeof(procps_status_t));
|
|
}
|
|
if (ntop == 0) {
|
|
bb_error_msg_and_die("Can't find process info in /proc");
|
|
}
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
if(!Hertz) {
|
|
init_Hertz_value();
|
|
do_stats();
|
|
sleep(1);
|
|
clearmems();
|
|
continue;
|
|
}
|
|
do_stats();
|
|
#else
|
|
qsort(top, ntop, sizeof(procps_status_t), (void*)sort_function);
|
|
#endif /* CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE */
|
|
opt = lines;
|
|
if (opt > ntop) {
|
|
opt = ntop;
|
|
}
|
|
/* show status for each of the processes */
|
|
display_status(opt, col);
|
|
#ifdef CONFIG_FEATURE_USE_TERMIOS
|
|
tv.tv_sec = interval;
|
|
tv.tv_usec = 0;
|
|
FD_ZERO (&readfds);
|
|
FD_SET (0, &readfds);
|
|
select (1, &readfds, NULL, NULL, &tv);
|
|
if (FD_ISSET (0, &readfds)) {
|
|
if (read (0, &c, 1) <= 0) { /* signal */
|
|
return EXIT_FAILURE;
|
|
}
|
|
if(c == 'q' || c == initial_settings.c_cc[VINTR])
|
|
break;
|
|
if(c == 'M') {
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
sort_function[0] = mem_sort;
|
|
sort_function[1] = pcpu_sort;
|
|
sort_function[2] = time_sort;
|
|
#else
|
|
sort_function = mem_sort;
|
|
#endif
|
|
}
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
if(c == 'P') {
|
|
sort_function[0] = pcpu_sort;
|
|
sort_function[1] = mem_sort;
|
|
sort_function[2] = time_sort;
|
|
}
|
|
if(c == 'T') {
|
|
sort_function[0] = time_sort;
|
|
sort_function[1] = mem_sort;
|
|
sort_function[2] = pcpu_sort;
|
|
}
|
|
#endif
|
|
if(c == 'N') {
|
|
#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
|
|
sort_function[0] = pid_sort;
|
|
#else
|
|
sort_function = pid_sort;
|
|
#endif
|
|
}
|
|
}
|
|
#else
|
|
sleep(interval);
|
|
#endif /* CONFIG_FEATURE_USE_TERMIOS */
|
|
clearmems();
|
|
}
|
|
if(ENABLE_FEATURE_CLEAN_UP)
|
|
clearmems();
|
|
putchar('\n');
|
|
return EXIT_SUCCESS;
|
|
}
|