523 lines
17 KiB
C
523 lines
17 KiB
C
/***********************************************************************\
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* Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com *
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* *
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* This file is placed under the conditions of the GNU Library *
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* General Public License, version 2, or any later version. *
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* See file COPYING for information on distribution conditions. *
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\***********************************************************************/
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/* File for parsing top-level /proc entities. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <locale.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "version.h"
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#include "sysinfo.h" /* include self to verify prototypes */
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#ifndef HZ
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#include <netinet/in.h> /* htons */
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#endif
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long smp_num_cpus; /* number of CPUs */
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#define BAD_OPEN_MESSAGE \
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"Error: /proc must be mounted\n" \
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" To mount /proc at boot you need an /etc/fstab line like:\n" \
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" /proc /proc proc defaults\n" \
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" In the meantime, mount /proc /proc -t proc\n"
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#define STAT_FILE "/proc/stat"
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static int stat_fd = -1;
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#define UPTIME_FILE "/proc/uptime"
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static int uptime_fd = -1;
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#define LOADAVG_FILE "/proc/loadavg"
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static int loadavg_fd = -1;
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#define MEMINFO_FILE "/proc/meminfo"
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static int meminfo_fd = -1;
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#define VMINFO_FILE "/proc/vmstat"
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static int vminfo_fd = -1;
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static char buf[1024];
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/* This macro opens filename only if necessary and seeks to 0 so
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* that successive calls to the functions are more efficient.
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* It also reads the current contents of the file into the global buf.
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*/
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#define FILE_TO_BUF(filename, fd) do{ \
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static int local_n; \
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if (fd == -1 && (fd = open(filename, O_RDONLY)) == -1) { \
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fprintf(stderr, BAD_OPEN_MESSAGE); \
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fflush(NULL); \
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_exit(102); \
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} \
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lseek(fd, 0L, SEEK_SET); \
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if ((local_n = read(fd, buf, sizeof buf - 1)) < 0) { \
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perror(filename); \
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fflush(NULL); \
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_exit(103); \
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} \
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buf[local_n] = '\0'; \
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}while(0)
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/* evals 'x' twice */
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#define SET_IF_DESIRED(x,y) do{ if(x) *(x) = (y); }while(0)
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/***********************************************************************/
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int uptime(double *restrict uptime_secs, double *restrict idle_secs) {
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double up=0, idle=0;
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char *restrict savelocale;
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FILE_TO_BUF(UPTIME_FILE,uptime_fd);
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savelocale = setlocale(LC_NUMERIC, NULL);
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setlocale(LC_NUMERIC,"C");
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if (sscanf(buf, "%lf %lf", &up, &idle) < 2) {
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setlocale(LC_NUMERIC,savelocale);
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fprintf(stderr, "bad data in " UPTIME_FILE "\n");
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return 0;
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}
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setlocale(LC_NUMERIC,savelocale);
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SET_IF_DESIRED(uptime_secs, up);
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SET_IF_DESIRED(idle_secs, idle);
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return up; /* assume never be zero seconds in practice */
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}
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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-dependant 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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* Recent update: on some architectures, the 2.4 kernel provides an
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* ELF note to indicate HZ. This may be for ARM or user-mode Linux
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* support. This ought to be investigated. Note that sysconf() is still
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* unreliable, because it doesn't return an error code when it is
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* used with a kernel that doesn't support the ELF note. On some other
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* architectures there may be a system call or sysctl() that will work.
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*/
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unsigned long long Hertz;
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static void old_Hertz_hack(void){
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unsigned long 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 long jiffies;
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unsigned h;
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char *restrict savelocale;
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savelocale = setlocale(LC_NUMERIC, NULL);
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setlocale(LC_NUMERIC, "C");
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do{
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FILE_TO_BUF(UPTIME_FILE,uptime_fd); sscanf(buf, "%lf", &up_1);
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/* uptime(&up_1, NULL); */
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FILE_TO_BUF(STAT_FILE,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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FILE_TO_BUF(UPTIME_FILE,uptime_fd); sscanf(buf, "%lf", &up_2);
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/* uptime(&up_2, NULL); */
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} while((long long)( (up_2-up_1)*1000.0/up_1 )); /* want under 0.1% error */
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setlocale(LC_NUMERIC, savelocale);
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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)( (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 9 ... 11 : Hertz = 10; break; /* S/390 (sometimes) */
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case 18 ... 22 : Hertz = 20; break; /* user-mode Linux */
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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 ... 61 : Hertz = 60; break;
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case 62 ... 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 393 ... 408 : Hertz = 400; break; /* normal << 2 */
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case 790 ... 808 : Hertz = 800; break; /* normal << 3 */
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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 1180 ... 1220 : Hertz = 1200; break; /* Alpha */
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default:
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#ifdef HZ
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Hertz = (unsigned long long)HZ; /* <asm/param.h> */
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#else
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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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#endif
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fprintf(stderr, "Unknown HZ value! (%d) Assume %Ld.\n", h, Hertz);
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}
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}
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#ifndef AT_CLKTCK
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#define AT_CLKTCK 17 /* frequency of times() */
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#endif
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extern char** environ;
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/* for ELF executables, notes are pushed before environment and args */
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static unsigned long find_elf_note(unsigned long findme){
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unsigned long *ep = (unsigned long *)environ;
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while(*ep++);
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while(*ep){
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if(ep[0]==findme) return ep[1];
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ep+=2;
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}
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return 42;
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}
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static void init_libproc(void) __attribute__((constructor));
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static void init_libproc(void){
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/* ought to count CPUs in /proc/stat instead of relying
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* on glibc, which foolishly tries to parse /proc/cpuinfo
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*/
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smp_num_cpus = sysconf(_SC_NPROCESSORS_CONF); // or _SC_NPROCESSORS_ONLN
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if(smp_num_cpus<1) smp_num_cpus=1; /* SPARC glibc is buggy */
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if(linux_version_code > LINUX_VERSION(2, 4, 0)){
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Hertz = find_elf_note(AT_CLKTCK);
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if(Hertz!=42) return;
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fprintf(stderr, "2.4 kernel w/o ELF notes? -- report to albert@users.sf.net\n");
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}
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old_Hertz_hack();
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}
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/***********************************************************************
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* The /proc filesystem calculates idle=jiffies-(user+nice+sys) and we
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* recover jiffies by adding up the 4 or 5 numbers we are given. SMP kernels
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* (as of pre-2.4 era) can report idle time going backwards, perhaps due
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* to non-atomic reads and updates. There is no locking for these values.
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*/
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#ifndef NAN
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#define NAN (-0.0)
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#endif
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#define JT unsigned long long
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void five_cpu_numbers(double *restrict uret, double *restrict nret, double *restrict sret, double *restrict iret, double *restrict wret){
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double tmp_u, tmp_n, tmp_s, tmp_i, tmp_w;
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double scale; /* scale values to % */
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static JT old_u, old_n, old_s, old_i, old_w;
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JT new_u, new_n, new_s, new_i, new_w;
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JT ticks_past; /* avoid div-by-0 by not calling too often :-( */
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tmp_w = 0.0;
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new_w = 0;
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FILE_TO_BUF(STAT_FILE,stat_fd);
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sscanf(buf, "cpu %Lu %Lu %Lu %Lu %Lu", &new_u, &new_n, &new_s, &new_i, &new_w);
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ticks_past = (new_u+new_n+new_s+new_i+new_w)-(old_u+old_n+old_s+old_i+old_w);
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if(ticks_past){
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scale = 100.0 / (double)ticks_past;
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tmp_u = ( (double)new_u - (double)old_u ) * scale;
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tmp_n = ( (double)new_n - (double)old_n ) * scale;
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tmp_s = ( (double)new_s - (double)old_s ) * scale;
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tmp_i = ( (double)new_i - (double)old_i ) * scale;
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tmp_w = ( (double)new_w - (double)old_w ) * scale;
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}else{
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tmp_u = NAN;
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tmp_n = NAN;
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tmp_s = NAN;
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tmp_i = NAN;
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tmp_w = NAN;
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}
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SET_IF_DESIRED(uret, tmp_u);
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SET_IF_DESIRED(nret, tmp_n);
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SET_IF_DESIRED(sret, tmp_s);
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SET_IF_DESIRED(iret, tmp_i);
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SET_IF_DESIRED(wret, tmp_w);
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old_u=new_u;
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old_n=new_n;
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old_s=new_s;
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old_i=new_i;
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old_w=new_w;
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}
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#undef JT
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/***********************************************************************/
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void loadavg(double *restrict av1, double *restrict av5, double *restrict av15) {
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double avg_1=0, avg_5=0, avg_15=0;
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char *restrict savelocale;
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FILE_TO_BUF(LOADAVG_FILE,loadavg_fd);
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savelocale = setlocale(LC_NUMERIC, NULL);
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setlocale(LC_NUMERIC, "C");
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if (sscanf(buf, "%lf %lf %lf", &avg_1, &avg_5, &avg_15) < 3) {
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fprintf(stderr, "bad data in " LOADAVG_FILE "\n");
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exit(1);
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}
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setlocale(LC_NUMERIC, savelocale);
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SET_IF_DESIRED(av1, avg_1);
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SET_IF_DESIRED(av5, avg_5);
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SET_IF_DESIRED(av15, avg_15);
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}
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/***********************************************************************/
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/*
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* Copyright 1999 by Albert Cahalan; all rights reserved.
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* This file may be used subject to the terms and conditions of the
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* GNU Library General Public License Version 2, or any later version
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* at your option, as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*/
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typedef struct mem_table_struct {
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const char *name; /* memory type name */
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unsigned *slot; /* slot in return struct */
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} mem_table_struct;
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static int compare_mem_table_structs(const void *a, const void *b){
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return strcmp(((const mem_table_struct*)a)->name,((const mem_table_struct*)b)->name);
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}
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/* example data, following junk, with comments added:
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*
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* MemTotal: 61768 kB old
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* MemFree: 1436 kB old
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* MemShared: 0 kB old (now always zero; not calculated)
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* Buffers: 1312 kB old
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* Cached: 20932 kB old
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* Active: 12464 kB new
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* Inact_dirty: 7772 kB new
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* Inact_clean: 2008 kB new
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* Inact_target: 0 kB new
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* HighTotal: 0 kB
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* HighFree: 0 kB
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* LowTotal: 61768 kB
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* LowFree: 1436 kB
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* SwapTotal: 122580 kB old
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* SwapFree: 60352 kB old
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* Inactive: 20420 kB 2.5.41+
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* Dirty: 0 kB 2.5.41+
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* Writeback: 0 kB 2.5.41+
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* Mapped: 9792 kB 2.5.41+
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* Slab: 4564 kB 2.5.41+
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* Committed_AS: 8440 kB 2.5.41+
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* PageTables: 304 kB 2.5.41+
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* ReverseMaps: 5738 2.5.41+
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*/
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/* obsolete */
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unsigned kb_main_shared;
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/* old but still kicking -- the important stuff */
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unsigned kb_main_buffers;
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unsigned kb_main_cached;
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unsigned kb_main_free;
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unsigned kb_main_total;
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unsigned kb_swap_free;
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unsigned kb_swap_total;
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/* recently introduced */
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unsigned kb_high_free;
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unsigned kb_high_total;
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unsigned kb_low_free;
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unsigned kb_low_total;
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/* 2.4.xx era */
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unsigned kb_active;
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unsigned kb_inact_dirty;
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unsigned kb_inact_clean;
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unsigned kb_inact_target;
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unsigned kb_swap_cached; /* late 2.4 only */
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/* derived values */
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unsigned kb_swap_used;
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unsigned kb_main_used;
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/* 2.5.41+ */
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unsigned kb_writeback;
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unsigned kb_slab;
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unsigned nr_reversemaps;
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unsigned kb_committed_as;
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unsigned kb_dirty;
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unsigned kb_inactive;
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unsigned kb_mapped;
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unsigned kb_pagetables;
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void meminfo(void){
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char namebuf[16]; /* big enough to hold any row name */
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mem_table_struct findme = { namebuf, NULL};
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mem_table_struct *found;
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char *head;
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char *tail;
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static const mem_table_struct mem_table[] = {
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{"Active", &kb_active},
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{"Buffers", &kb_main_buffers},
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{"Cached", &kb_main_cached},
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{"Committed_AS", &kb_committed_as},
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{"Dirty", &kb_dirty},
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{"HighFree", &kb_high_free},
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{"HighTotal", &kb_high_total},
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{"Inact_clean", &kb_inact_clean},
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{"Inact_dirty", &kb_inact_dirty},
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{"Inact_target", &kb_inact_target},
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{"Inactive", &kb_inactive},
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{"LowFree", &kb_low_free},
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{"LowTotal", &kb_low_total},
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{"Mapped", &kb_mapped},
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{"MemFree", &kb_main_free},
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{"MemShared", &kb_main_shared},
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{"MemTotal", &kb_main_total},
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{"PageTables", &kb_pagetables},
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{"ReverseMaps", &nr_reversemaps},
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{"Slab", &kb_slab},
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{"SwapCached", &kb_swap_cached},
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{"SwapFree", &kb_swap_free},
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{"SwapTotal", &kb_swap_total},
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{"Writeback", &kb_writeback}
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};
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const int mem_table_count = sizeof(mem_table)/sizeof(mem_table_struct);
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FILE_TO_BUF(MEMINFO_FILE,meminfo_fd);
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kb_inactive = ~0U;
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head = buf;
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for(;;){
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tail = strchr(head, ':');
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if(!tail) break;
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*tail = '\0';
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if(strlen(head) >= sizeof(namebuf)){
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head = tail+1;
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goto nextline;
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}
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strcpy(namebuf,head);
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found = bsearch(&findme, mem_table, mem_table_count,
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sizeof(mem_table_struct), compare_mem_table_structs
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);
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head = tail+1;
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if(!found) goto nextline;
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*(found->slot) = strtoul(head,&tail,10);
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nextline:
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tail = strchr(head, '\n');
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if(!tail) break;
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head = tail+1;
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}
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if(!kb_low_total){ /* low==main except with large-memory support */
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kb_low_total = kb_main_total;
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kb_low_free = kb_main_free;
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}
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if(kb_inactive==~0U){
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kb_inactive = kb_inact_dirty + kb_inact_clean;
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}
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kb_swap_used = kb_swap_total - kb_swap_free;
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kb_main_used = kb_main_total - kb_main_free;
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}
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/*****************************************************************/
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/* read /proc/vminfo only for 2.5.41 and above */
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typedef struct vm_table_struct {
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const char *name; /* VM statistic name */
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unsigned *slot; /* slot in return struct */
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} vm_table_struct;
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static int compare_vm_table_structs(const void *a, const void *b){
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return strcmp(((const vm_table_struct*)a)->name,((const vm_table_struct*)b)->name);
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}
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unsigned vm_nr_dirty;
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unsigned vm_nr_writeback;
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unsigned vm_nr_pagecache;
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unsigned vm_nr_page_table_pages;
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unsigned vm_nr_reverse_maps;
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unsigned vm_nr_mapped;
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unsigned vm_nr_slab;
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unsigned vm_pgpgin;
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unsigned vm_pgpgout;
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unsigned vm_pswpin; /* same as 1st num on /proc/stat swap line */
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unsigned vm_pswpout; /* same as 2nd num on /proc/stat swap line */
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unsigned vm_pgalloc;
|
|
unsigned vm_pgfree;
|
|
unsigned vm_pgactivate;
|
|
unsigned vm_pgdeactivate;
|
|
unsigned vm_pgfault;
|
|
unsigned vm_pgmajfault;
|
|
unsigned vm_pgscan;
|
|
unsigned vm_pgrefill;
|
|
unsigned vm_pgsteal;
|
|
unsigned vm_kswapd_steal;
|
|
unsigned vm_pageoutrun;
|
|
unsigned vm_allocstall;
|
|
|
|
void vminfo(void){
|
|
char namebuf[16]; /* big enough to hold any row name */
|
|
vm_table_struct findme = { namebuf, NULL};
|
|
vm_table_struct *found;
|
|
char *head;
|
|
char *tail;
|
|
static const vm_table_struct vm_table[] = {
|
|
{"allocstall", &vm_allocstall},
|
|
{"kswapd_steal", &vm_kswapd_steal},
|
|
{"nr_dirty", &vm_nr_dirty},
|
|
{"nr_mapped", &vm_nr_mapped},
|
|
{"nr_page_table_pages", &vm_nr_page_table_pages},
|
|
{"nr_pagecache", &vm_nr_pagecache},
|
|
{"nr_reverse_maps", &vm_nr_reverse_maps},
|
|
{"nr_slab", &vm_nr_slab},
|
|
{"nr_writeback", &vm_nr_writeback},
|
|
{"pageoutrun", &vm_pageoutrun},
|
|
{"pgactivate", &vm_pgactivate},
|
|
{"pgalloc", &vm_pgalloc},
|
|
{"pgdeactivate", &vm_pgdeactivate},
|
|
{"pgfault", &vm_pgfault},
|
|
{"pgfree", &vm_pgfree},
|
|
{"pgmajfault", &vm_pgmajfault},
|
|
{"pgpgin", &vm_pgpgin},
|
|
{"pgpgout", &vm_pgpgout},
|
|
{"pgrefill", &vm_pgrefill},
|
|
{"pgscan", &vm_pgscan},
|
|
{"pgsteal", &vm_pgsteal},
|
|
{"pswpin", &vm_pswpin},
|
|
{"pswpout", &vm_pswpout}
|
|
};
|
|
const int vm_table_count = sizeof(vm_table)/sizeof(vm_table_struct);
|
|
|
|
FILE_TO_BUF(VMINFO_FILE,vminfo_fd);
|
|
|
|
head = buf;
|
|
for(;;){
|
|
tail = strchr(head, ' ');
|
|
if(!tail) break;
|
|
*tail = '\0';
|
|
if(strlen(head) >= sizeof(namebuf)){
|
|
head = tail+1;
|
|
goto nextline;
|
|
}
|
|
strcpy(namebuf,head);
|
|
found = bsearch(&findme, vm_table, vm_table_count,
|
|
sizeof(vm_table_struct), compare_vm_table_structs
|
|
);
|
|
head = tail+1;
|
|
if(!found) goto nextline;
|
|
*(found->slot) = strtoul(head,&tail,10);
|
|
nextline:
|
|
|
|
//if(found) fprintf(stderr,"%s=%d\n",found->name,*(found->slot));
|
|
//else fprintf(stderr,"%s not found\n",findme.name);
|
|
|
|
tail = strchr(head, '\n');
|
|
if(!tail) break;
|
|
head = tail+1;
|
|
}
|
|
}
|
|
/*****************************************************************/
|