722 lines
21 KiB
C
722 lines
21 KiB
C
/*
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* vmstat_hpux.c
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* UCD SNMP module for systemStats section of UCD-SNMP-MIB for HPUX 10.x/11.x
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*/
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/*
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* To make lint skip the debug code and stop complaining
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*/
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#ifdef __lint
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#define NETSNMP_NO_DEBUGGING 1
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#endif
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/*
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* Includes start here
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*/
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/*
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* UCD-SNMP config details
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*/
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#include <net-snmp/net-snmp-config.h>
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/*
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* Standard includes
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <string.h>
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/*
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* pstat and sysinfo structs
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*/
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#include <sys/pstat.h>
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#include <sys/dk.h>
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/*
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* Includes needed for all modules
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*/
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#include <net-snmp/net-snmp-includes.h>
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#include <net-snmp/agent/net-snmp-agent-includes.h>
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#include "mibdefs.h"
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/*
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* Utility functions for UCD-SNMP
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*/
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#include "util_funcs/header_generic.h"
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/*
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* Header file for this module
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*/
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#include "vmstat.h"
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#include "vmstat_hpux.h"
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/*
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* Includes end here
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*/
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/*
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* Global structures start here
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*/
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/*
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* A structure to save data gathered from the kernel pstat interface to.
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* CPUSTATES are defined as (see sys/dk.h):
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* #define CPUSTATES 9 -- number of CPU states
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* #define CP_USER 0 -- user mode of USER process
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* #define CP_NICE 1 -- user mode of USER process at nice priority
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* #define CP_SYS 2 -- kernel mode of USER process
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* #define CP_IDLE 3 -- IDLE mode
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* #define CP_WAIT 4
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* #define CP_BLOCK 5 -- time blocked on a spinlock
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* #define CP_SWAIT 6 -- time blocked on the kernel semaphore
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* #define CP_INTR 7 -- INTERRUPT mode
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* #define CP_SSYS 8 -- kernel mode of KERNEL process
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*/
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struct cpu_stat_snapshot {
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time_t css_time;
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unsigned int css_cpus;
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unsigned long long css_swapin;
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unsigned long long css_swapout;
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unsigned long long css_blocks_read;
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unsigned long long css_blocks_write;
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unsigned long long css_interrupts;
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unsigned long long css_context_sw;
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unsigned long long css_cpu[CPUSTATES];
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};
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/*
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* Define a structure to hold kernel static information
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*/
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struct pst_static pst;
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/*
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* Global structures end here
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*/
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/*
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* Global variables start here
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*/
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/*
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* Variables for the calculated values, filled in update_stats
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* Need to be global since we need them in more than one function
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*/
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static unsigned long swapin;
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static unsigned long swapout;
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static unsigned long blocks_read;
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static unsigned long blocks_write;
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static unsigned long interrupts;
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static unsigned long context_sw;
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/*
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* Since MIB wants CPU_SYSTEM, which is CP_SYS + CP_WAIT (see sys/dk.h)
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*/
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static long cpu_perc[CPUSTATES + 1];
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/*
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* How many snapshots we have already taken, needed for the first
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* POLL_INTERVAL * POLL_VALUES seconds of agent running
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*/
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static unsigned int number_of_snapshots;
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/*
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* The place to store the snapshots of system data in
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*/
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static struct cpu_stat_snapshot snapshot[POLL_VALUES + 1];
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/*
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* And one for the raw counters, which we fill when the raw values are
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* requested, as opposed to the absolute values, which are taken every
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* POLL_INTERVAL seconds and calculated over POLL_INTERVAL * POLL_VALUES time
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*/
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static struct cpu_stat_snapshot raw_values;
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/*
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* Global variables end here
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*/
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/*
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* Functions start here
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*/
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/*
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* Function prototype
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*/
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static void update_stats(unsigned int registrationNumber,
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void *clientarg);
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static int take_snapshot(struct cpu_stat_snapshot *css);
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/*
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* init_vmstat_hpux starts here
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*/
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/*
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* Init function for this module, from prototype
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* Defines variables handled by this module, defines root OID for
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* this module and registers it with the agent
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*/
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FindVarMethod var_extensible_vmstat;
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void
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init_vmstat_hpux(void)
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{
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/*
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* Which variables do we service ?
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*/
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struct variable2 extensible_vmstat_variables[] = {
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{MIBINDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {MIBINDEX}},
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{ERRORNAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {ERRORNAME}},
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{SWAPIN, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SWAPIN}},
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{SWAPOUT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SWAPOUT}},
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{IOSENT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IOSENT}},
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{IORECEIVE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORECEIVE}},
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{SYSINTERRUPTS, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SYSINTERRUPTS}},
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{SYSCONTEXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SYSCONTEXT}},
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{CPUUSER, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUUSER}},
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{CPUSYSTEM, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUSYSTEM}},
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{CPUIDLE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUIDLE}},
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{CPURAWUSER, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWUSER}},
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{CPURAWNICE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWNICE}},
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{CPURAWSYSTEM, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWSYSTEM}},
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{CPURAWIDLE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWIDLE}},
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{CPURAWWAIT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWWAIT}},
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{CPURAWKERNEL, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWKERNEL}},
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{IORAWSENT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORAWSENT}},
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{IORAWRECEIVE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORAWRECEIVE}},
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/*
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* Future use:
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*/
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/*
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* {ERRORFLAG, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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* var_extensible_vmstat, 1, {ERRORFLAG }},
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* {ERRORMSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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* var_extensible_vmstat, 1, {ERRORMSG }}
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*/
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};
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/*
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* Define the OID pointer to the top of the mib tree that we're
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* registering underneath
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*/
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oid vmstat_variables_oid[] = { NETSNMP_UCDAVIS_MIB, 11 };
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/*
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* register ourselves with the agent to handle our mib tree
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*/
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/*
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* LINTED Trust me, I know what I'm doing
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*/
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REGISTER_MIB("ucd-snmp/vmstat", extensible_vmstat_variables, variable2,
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vmstat_variables_oid);
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/*
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* Start with some useful data
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*/
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update_stats(0, NULL);
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/*
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* update_stats is run every POLL_INTERVAL seconds using this routine
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* (see 'man snmp_alarm')
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* This is only executed once to get some useful data in the beginning
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*/
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if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
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snmp_log(LOG_WARNING,
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"vmstat_hpux (init): snmp_alarm_register failed.\n");
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}
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/*
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* This is the one that runs update_stats every POLL_INTERVAL seconds
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*/
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if (snmp_alarm_register(POLL_INTERVAL, SA_REPEAT, update_stats, NULL)
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== 0) {
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snmp_log(LOG_ERR,
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"vmstat_hpux (init): snmp_alarm_register failed, cannot service requests.\n");
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}
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} /* init_vmstat_hpux ends here */
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/*
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* Data collection function take_snapshot starts here
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* Get data from kernel and save into the snapshot strutcs
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* Argument is the snapshot struct to save to. Global anyway, but looks nicer
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*/
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static int
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take_snapshot(struct cpu_stat_snapshot *css)
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{
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/*
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* Variables start here
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*/
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struct pst_dynamic psd;
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struct pst_processor *psp;
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struct pst_vminfo psv;
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/*
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* time counter
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*/
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time_t current_time;
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/*
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* The usual stuff to count on, err, by
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*/
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int i;
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/*
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* Variables end here
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*/
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/*
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* Function starts here
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*/
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/*
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* Get time
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*/
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time(¤t_time);
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/*
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* If we have just gotten the data, return the values from last run (skip if-clause)
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* This happens on a snmpwalk request. No need to read the pstat again
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* if we just did it less than 2 seconds ago
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* Jumps into if-clause either when snapshot is empty or when too old
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*/
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if ((css->css_time == 0) || (current_time > css->css_time + 2)) {
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/*
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* Make sure we clean up before we put new data into snapshot
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*/
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memset(css, 0, sizeof *css);
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/*
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* Update timer
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*/
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css->css_time = current_time;
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if (pstat_getdynamic(&psd, sizeof(psd), (size_t) 1, 0) != -1) {
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css->css_cpus = psd.psd_proc_cnt;
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DEBUGMSGTL(("take_snapshot", "*** Number of CPUs: %d\n",
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css->css_cpus));
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/*
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* We need a for-loop for the CPU values
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*/
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for (i = 0; i < CPUSTATES; i++) {
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css->css_cpu[i] = (unsigned long long) psd.psd_cpu_time[i];
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DEBUGMSGTL(("take_snapshot",
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"*** Time for CPU state %d: %d\n", i,
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psd.psd_cpu_time[i]));
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}
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psp =
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(struct pst_processor *) malloc(css->css_cpus *
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sizeof(*psp));
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if (pstat_getprocessor(psp, sizeof(*psp), css->css_cpus, 0) !=
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-1) {
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int i;
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for (i = 0; i < css->css_cpus; i++) {
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css->css_blocks_read = psp[i].psp_phread;
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css->css_blocks_write = psp[i].psp_phwrite;
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}
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} else
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snmp_log(LOG_ERR,
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"vmstat_hpux (take_snapshot): pstat_getprocessor failed!\n");
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} else
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snmp_log(LOG_ERR,
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"vmstat_hpux (take_snapshot): pstat_getdynamic failed!\n");
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if (pstat_getvminfo(&psv, sizeof(psv), (size_t) 1, 0) != -1) {
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css->css_swapin = psv.psv_sswpin;
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css->css_swapout = psv.psv_sswpout;
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css->css_interrupts = psv.psv_sintr;
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css->css_context_sw = psv.psv_sswtch;
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} else
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snmp_log(LOG_ERR,
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"vmstat_hpux (take_snapshot): pstat_getvminfo failed!\n");
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}
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/*
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* All engines running at warp speed, no problems (if there are any engines, that is)
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*/
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return (css->css_cpus > 0 ? 0 : -1);
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} /* take_snapshot ends here */
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/*
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* This gets called every POLL_INTERVAL seconds to update the snapshots. It takes a new snapshot and
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* drops the oldest one. This way we move the time window so we always take the values over
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* POLL_INTERVAL * POLL_VALUES seconds and update the data used every POLL_INTERVAL seconds
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* The alarm timer is in the init function of this module (snmp_alarm_register)
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*/
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/*
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* ARGSUSED0
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*/
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static void
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update_stats(unsigned int registrationNumber, void *clientarg)
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{
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/*
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* The time between the samples we compare
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*/
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time_t time_diff;
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/*
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* Easier to use these than the snapshots, short hand pointers
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*/
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struct cpu_stat_snapshot *css_old, *css_new;
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/*
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* The usual stuff to count on, err, by
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*/
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int i;
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/*
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* The sum of the CPU ticks that have passed on the different CPU states, so we can calculate
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* the percentages of each state
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*/
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unsigned long long cpu_sum = 0;
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DEBUGMSGTL(("ucd-snmp/vmstat_hpux.c:update_stats",
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"updating stats\n"));
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/*
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* Take the current snapshot
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*/
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if (take_snapshot(&snapshot[0]) == -1) {
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snmp_log(LOG_WARNING,
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"vmstat_hpux (update_stats): Something went wrong with take_snapshot.\n");
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return;
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}
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/*
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* Do we have some data we can use ? An issue right after the start of the agent
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*/
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if (number_of_snapshots > 0) {
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/*
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* Huh, the number of CPUs changed during run time. That is indeed s.th. worth noting, we
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* output a humorous (more or less) syslog message and need to retake the snapshots
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*/
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if (snapshot[0].css_cpus != snapshot[1].css_cpus) {
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if (snapshot[0].css_cpus > snapshot[1].css_cpus) {
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snmp_log(LOG_NOTICE,
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"vmstat_hpux (update_stats): Cool ! Number of CPUs increased, must be hot-pluggable.\n");
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} else {
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snmp_log(LOG_NOTICE,
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"vmstat_hpux (update_stats): Lost at least one CPU, RIP.\n");
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}
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/*
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* Make all snapshots but the current one invalid
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*/
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number_of_snapshots = 1;
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/*
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* Move the current one in the "first" [1] slot
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*/
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memmove(&snapshot[1], &snapshot[0], sizeof snapshot[0]);
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/*
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* Erase the current one
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*/
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memset(&snapshot[0], 0, sizeof snapshot[0]);
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/*
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* Try to get a new snapshot in five seconds so we can return s.th. useful
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*/
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if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
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snmp_log(LOG_WARNING,
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"vmstat_hpux (update_stats): snmp_alarm_register failed.\n");
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}
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return;
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}
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/*
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* Short hand pointers
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*/
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css_new = &snapshot[0];
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css_old = &snapshot[number_of_snapshots];
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/*
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* How much time has passed between the snapshots we get the values from ?
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*/
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time_diff =
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(snapshot[0].css_time -
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snapshot[number_of_snapshots].css_time);
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DEBUGMSGTL(("ucd-snmp/vmstat_hpux.c:update_stats",
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"time_diff: %lld\n", time_diff));
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/*
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* swapin and swapout are in pages, MIB wants kB/s,so we just need to get kB and seconds
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* For the others we need to get value per second
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* Retreive static information to obtain memory page_size
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*/
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if (pstat_getstatic(&pst, sizeof(pst), (size_t) 1, 0) == -1) {
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snmp_log(LOG_ERR, "vmstat_hpux: pstat_getstatic failed!\n");
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}
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/*
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* LINTED cast needed, really
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*/
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swapin =
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(unsigned int) ((css_new->css_swapin - css_old->css_swapin) *
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pst.page_size / 1024 / time_diff);
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/*
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* LINTED cast needed, really
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*/
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swapout =
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(unsigned int) ((css_new->css_swapout - css_old->css_swapout) *
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pst.page_size / 1024 / time_diff);
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/*
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* LINTED cast needed, really
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*/
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blocks_read =
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(unsigned
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int) ((css_new->css_blocks_read -
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css_old->css_blocks_read) / time_diff);
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/*
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* LINTED cast needed, really
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*/
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blocks_write =
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(unsigned
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int) ((css_new->css_blocks_write -
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css_old->css_blocks_write) / time_diff);
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/*
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* LINTED cast needed, really
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*/
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interrupts =
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(unsigned
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int) ((css_new->css_interrupts -
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css_old->css_interrupts) / time_diff);
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/*
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* LINTED cast needed, really
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*/
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context_sw =
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(unsigned
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int) ((css_new->css_context_sw -
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css_old->css_context_sw) / time_diff);
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/*
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* Loop thru all the CPUSTATES and get the differences
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*/
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for (i = 0; i < CPUSTATES; i++) {
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cpu_sum += (css_new->css_cpu[i] - css_old->css_cpu[i]);
|
|
}
|
|
|
|
/*
|
|
* Now calculate the absolute percentage values
|
|
* Looks somewhat complicated sometimes but tries to get around using floats to increase speed
|
|
*/
|
|
for (i = 0; i < CPUSTATES; i++) {
|
|
/*
|
|
* Since we don't return fractions we use + 0.5 to get between 99 and 101 percent adding the values
|
|
* together, otherwise we would get less than 100 most of the time
|
|
*/
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
cpu_perc[i] =
|
|
(long) (((css_new->css_cpu[i] -
|
|
css_old->css_cpu[i]) * 100 +
|
|
(cpu_sum / 2)) / cpu_sum);
|
|
}
|
|
|
|
/*
|
|
* As said before, MIB wants CPU_SYSTEM which is CP_SYS + CP_WAIT
|
|
*/
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
cpu_perc[CPU_SYSTEM] =
|
|
(long) ((((css_new->css_cpu[CP_SYS] - css_old->css_cpu[CP_SYS])
|
|
+ (css_new->css_cpu[CP_WAIT] -
|
|
css_old->css_cpu[CP_WAIT]))
|
|
* 100 + (cpu_sum / 2)) / cpu_sum);
|
|
}
|
|
|
|
/*
|
|
* Make the current one the first one and move the whole thing one place down
|
|
*/
|
|
memmove(&snapshot[1], &snapshot[0],
|
|
(size_t) (((char *) &snapshot[POLL_VALUES]) -
|
|
((char *) &snapshot[0])));
|
|
|
|
/*
|
|
* Erase the current one
|
|
*/
|
|
memset(&snapshot[0], 0, sizeof snapshot[0]);
|
|
|
|
/*
|
|
* Only important on start up, we keep track of how many snapshots we have taken so far
|
|
*/
|
|
if (number_of_snapshots < POLL_VALUES) {
|
|
number_of_snapshots++;
|
|
}
|
|
} /* update_stats ends here */
|
|
|
|
/*
|
|
* *var_extensible_vmstat starts here
|
|
* The guts of the module, this routine gets called to service a request
|
|
*/
|
|
unsigned char *
|
|
var_extensible_vmstat(struct variable *vp,
|
|
oid * name,
|
|
size_t * length,
|
|
int exact,
|
|
size_t * var_len, WriteMethod ** write_method)
|
|
{
|
|
/*
|
|
* Needed for returning the values
|
|
*/
|
|
static long long_ret;
|
|
static char errmsg[300];
|
|
|
|
/*
|
|
* set to 0 as default
|
|
*/
|
|
long_ret = 0;
|
|
|
|
/*
|
|
* generic check whether the options passed make sense and whether the
|
|
* right variable is requested
|
|
*/
|
|
if (header_generic(vp, name, length, exact, var_len, write_method) !=
|
|
MATCH_SUCCEEDED) {
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* The function that actually returns s.th.
|
|
*/
|
|
switch (vp->magic) {
|
|
case MIBINDEX:
|
|
long_ret = 1;
|
|
return ((u_char *) (&long_ret));
|
|
case ERRORNAME: /* dummy name */
|
|
sprintf(errmsg, "systemStats");
|
|
*var_len = strlen(errmsg);
|
|
return ((u_char *) (errmsg));
|
|
case SWAPIN:
|
|
return ((u_char *) (&swapin));
|
|
case SWAPOUT:
|
|
return ((u_char *) (&swapout));
|
|
case IOSENT:
|
|
return ((u_char *) (&blocks_write));
|
|
case IORECEIVE:
|
|
return ((u_char *) (&blocks_read));
|
|
case SYSINTERRUPTS:
|
|
return ((u_char *) (&interrupts));
|
|
case SYSCONTEXT:
|
|
return ((u_char *) (&context_sw));
|
|
case CPUUSER:
|
|
return ((u_char *) (&cpu_perc[CP_USER]));
|
|
case CPUSYSTEM:
|
|
return ((u_char *) (&cpu_perc[CPU_SYSTEM]));
|
|
case CPUIDLE:
|
|
return ((u_char *) (&cpu_perc[CP_IDLE]));
|
|
case CPURAWUSER:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[CP_USER] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case CPURAWNICE:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[CP_NICE] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case CPURAWSYSTEM:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) ((raw_values.css_cpu[CP_SYS] +
|
|
raw_values.css_cpu[CP_WAIT]) / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case CPURAWIDLE:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[CP_IDLE] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case CPURAWWAIT:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[CP_WAIT] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case CPURAWKERNEL:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[CP_SYS] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
case IORAWSENT:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret = (long) (raw_values.css_blocks_write);
|
|
return ((u_char *) (&long_ret));
|
|
case IORAWRECEIVE:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret = (long) (raw_values.css_blocks_read);
|
|
return ((u_char *) (&long_ret));
|
|
|
|
/*
|
|
* reserved for future use
|
|
*/
|
|
/*
|
|
* case ERRORFLAG:
|
|
* return((u_char *) (&long_ret));
|
|
* case ERRORMSG:
|
|
* return((u_char *) (&long_ret));
|
|
*/
|
|
default:
|
|
snmp_log(LOG_ERR,
|
|
"vmstat_hpux: Error in request, no match found.\n");
|
|
}
|
|
return (NULL);
|
|
} /* *var_extensible_vmstat ends here */
|
|
|
|
/*
|
|
* Functions end here
|
|
*/
|
|
|
|
/*
|
|
* Program ends here
|
|
*/
|