4d3c19af52
Read the time of system boot from /proc/stat (entry: btime) instead of computing it as the difference between the current time and the uptime. This is the only way to get a consistent result which won't possibly change from one run to the next. The problems with the original code were: * Both the current time and the uptime are rounded down to the second, but the system doesn't boot on an integer second value so they do not tick at the same moment. Thus, the rounding errors can cause a one second difference from one run to the next. * We can't read the uptime and the current time at the exact same moment anyway, so the time difference we compute is bound to be inaccurate. Bug-Redhat: https://bugzilla.redhat.com/show_bug.cgi?id=222251 Author: Jean Delvare <jdelvare@suse.de> Reviewed-by: Craig Small <csmall@debian.org>
137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
#ifndef PROC_SYSINFO_H
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#define PROC_SYSINFO_H
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#include <sys/types.h>
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#include <sys/dir.h>
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#include "procps.h"
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EXTERN_C_BEGIN
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extern unsigned long long Hertz; /* clock tick frequency */
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extern long smp_num_cpus; /* number of CPUs */
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extern int have_privs; /* boolean, true if setuid or similar */
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#if 0
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#define JT double
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extern void eight_cpu_numbers(JT *uret, JT *nret, JT *sret, JT *iret, JT *wret, JT *xret, JT *yret, JT *zret);
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#undef JT
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#endif
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extern int uptime (double *uptime_secs, double *idle_secs);
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extern unsigned long getbtime(void);
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extern void loadavg(double *av1, double *av5, double *av15);
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/* obsolete */
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extern unsigned long kb_main_shared;
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/* old but still kicking -- the important stuff */
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extern unsigned long kb_main_buffers;
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extern unsigned long kb_main_cached;
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extern unsigned long kb_main_free;
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extern unsigned long kb_main_total;
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extern unsigned long kb_swap_free;
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extern unsigned long kb_swap_total;
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/* recently introduced */
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extern unsigned long kb_high_free;
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extern unsigned long kb_high_total;
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extern unsigned long kb_low_free;
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extern unsigned long kb_low_total;
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/* 2.4.xx era */
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extern unsigned long kb_active;
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extern unsigned long kb_inact_laundry; // grrr...
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extern unsigned long kb_inact_dirty;
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extern unsigned long kb_inact_clean;
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extern unsigned long kb_inact_target;
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extern unsigned long kb_swap_cached; /* late 2.4+ */
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/* derived values */
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extern unsigned long kb_swap_used;
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extern unsigned long kb_main_used;
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/* 2.5.41+ */
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extern unsigned long kb_writeback;
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extern unsigned long kb_slab;
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extern unsigned long nr_reversemaps;
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extern unsigned long kb_committed_as;
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extern unsigned long kb_dirty;
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extern unsigned long kb_inactive;
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extern unsigned long kb_mapped;
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extern unsigned long kb_pagetables;
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#define BUFFSIZE (64*1024)
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typedef unsigned long long jiff;
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extern void getstat(jiff *restrict cuse, jiff *restrict cice, jiff *restrict csys, jiff *restrict cide, jiff *restrict ciow, jiff *restrict cxxx, jiff *restrict cyyy, jiff *restrict czzz,
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unsigned long *restrict pin, unsigned long *restrict pout, unsigned long *restrict s_in, unsigned long *restrict sout,
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unsigned *restrict intr, unsigned *restrict ctxt,
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unsigned int *restrict running, unsigned int *restrict blocked,
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unsigned int *restrict btime, unsigned int *restrict processes);
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extern void meminfo(void);
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extern unsigned long vm_nr_dirty;
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extern unsigned long vm_nr_writeback;
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extern unsigned long vm_nr_pagecache;
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extern unsigned long vm_nr_page_table_pages;
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extern unsigned long vm_nr_reverse_maps;
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extern unsigned long vm_nr_mapped;
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extern unsigned long vm_nr_slab;
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extern unsigned long vm_pgpgin;
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extern unsigned long vm_pgpgout;
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extern unsigned long vm_pswpin;
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extern unsigned long vm_pswpout;
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extern unsigned long vm_pgalloc;
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extern unsigned long vm_pgfree;
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extern unsigned long vm_pgactivate;
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extern unsigned long vm_pgdeactivate;
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extern unsigned long vm_pgfault;
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extern unsigned long vm_pgmajfault;
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extern unsigned long vm_pgscan;
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extern unsigned long vm_pgrefill;
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extern unsigned long vm_pgsteal;
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extern unsigned long vm_kswapd_steal;
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extern unsigned long vm_pageoutrun;
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extern unsigned long vm_allocstall;
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extern void vminfo(void);
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typedef struct disk_stat{
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unsigned long long reads_sectors;
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unsigned long long written_sectors;
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char disk_name [16];
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unsigned inprogress_IO;
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unsigned merged_reads;
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unsigned merged_writes;
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unsigned milli_reading;
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unsigned milli_spent_IO;
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unsigned milli_writing;
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unsigned partitions;
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unsigned reads;
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unsigned weighted_milli_spent_IO;
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unsigned writes;
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}disk_stat;
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typedef struct partition_stat{
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char partition_name [16];
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unsigned long long reads_sectors;
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unsigned parent_disk; // index into a struct disk_stat array
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unsigned reads;
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unsigned writes;
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unsigned requested_writes;
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}partition_stat;
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extern unsigned int getpartitions_num(struct disk_stat *disks, int ndisks);
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extern unsigned int getdiskstat (struct disk_stat**,struct partition_stat**);
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typedef struct slab_cache{
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char name[48];
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unsigned active_objs;
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unsigned num_objs;
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unsigned objsize;
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unsigned objperslab;
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}slab_cache;
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extern unsigned int getslabinfo (struct slab_cache**);
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extern unsigned get_pid_digits(void) FUNCTION;
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EXTERN_C_END
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#endif /* SYSINFO_H */
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