390 lines
9.5 KiB
C
390 lines
9.5 KiB
C
/*
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* memory_freebsd2.c
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*/
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#include <net-snmp/net-snmp-config.h>
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/*
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* Ripped from /usr/scr/usr.bin/vmstat/vmstat.c (covering all bases)
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#ifdef dragonfly
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#include <sys/user.h>
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#else
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#include <sys/proc.h>
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#include <sys/dkstat.h>
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#endif
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#ifdef freebsd5
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#include <sys/bio.h>
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#endif
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#include <sys/buf.h>
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#include <sys/uio.h>
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#include <sys/namei.h>
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#include <sys/malloc.h>
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#include <sys/signal.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <sys/vmmeter.h>
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#if HAVE_SYS_VMPARAM_H
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#include <sys/vmparam.h>
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#else
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#include <vm/vm_param.h>
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#endif
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#include <time.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <paths.h>
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#include <limits.h>
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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 <net-snmp/agent/auto_nlist.h>
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#include "util_funcs.h"
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#include "memory.h"
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#include "memory_freebsd2.h"
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/*
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* nlist symbols
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*/
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#define SUM_SYMBOL "cnt"
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#ifndef openbsd2
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#define BUFSPACE_SYMBOL "bufspace"
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#endif
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/*
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* Default swap warning limit (kb)
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*/
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#define DEFAULTMINIMUMSWAP 16000
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/*
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* Swap warning limit
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*/
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long minimumswap;
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/*
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* Swap info
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*/
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quad_t swapTotal;
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quad_t swapUsed;
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quad_t swapFree;
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static FindVarMethod var_extensible_mem;
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void
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init_memory_freebsd2(void)
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{
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struct variable2 extensible_mem_variables[] = {
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{MIBINDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MIBINDEX}},
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{ERRORNAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {ERRORNAME}},
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{MEMTOTALSWAP, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMTOTALSWAP}},
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{MEMAVAILSWAP, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMAVAILSWAP}},
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{MEMTOTALREAL, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMTOTALREAL}},
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{MEMAVAILREAL, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMAVAILREAL}},
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{MEMTOTALSWAPTXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMTOTALSWAPTXT}},
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{MEMUSEDSWAPTXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMUSEDSWAPTXT}},
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{MEMTOTALREALTXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMTOTALREALTXT}},
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{MEMUSEDREALTXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMUSEDREALTXT}},
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{MEMTOTALFREE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMTOTALFREE}},
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{MEMSWAPMINIMUM, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMSWAPMINIMUM}},
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{MEMSHARED, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMSHARED}},
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{MEMBUFFER, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMBUFFER}},
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{MEMCACHED, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {MEMCACHED}},
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{ERRORFLAG, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {ERRORFLAG}},
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{ERRORMSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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var_extensible_mem, 1, {ERRORMSG}}
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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 mem_variables_oid[] = { NETSNMP_UCDAVIS_MIB, NETSNMP_MEMMIBNUM };
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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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REGISTER_MIB("ucd-snmp/memory", extensible_mem_variables, variable2,
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mem_variables_oid);
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snmpd_register_config_handler("swap", memory_parse_config,
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memory_free_config, "min-avail");
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}
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void
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memory_parse_config(const char *token, char *cptr)
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{
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minimumswap = atoi(cptr);
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}
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void
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memory_free_config(void)
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{
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minimumswap = DEFAULTMINIMUMSWAP;
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}
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#ifndef freebsd4
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/*
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* Executes swapinfo and parses last line
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*/
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/*
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* This is just way too ugly ;)
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*/
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void
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swapmode(void)
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{
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struct extensible ext;
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int fd;
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FILE *file;
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strcpy(ext.command, "/usr/sbin/swapinfo -k");
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if ((fd = get_exec_output(&ext)) != -1) {
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file = fdopen(fd, "r");
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while (fgets(ext.output, sizeof(ext.output), file) != NULL);
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fclose(file);
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wait_on_exec(&ext);
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sscanf(ext.output, "%*s%*d%qd%qd", &swapUsed, &swapFree);
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swapTotal = swapUsed + swapFree;
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}
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}
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#else
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/*
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* swapmode is based on a program called swapinfo written
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* by Kevin Lahey <kml@rokkaku.atl.ga.us>.
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*/
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#include <sys/conf.h>
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void
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swapmode(void)
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{
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int pagesize;
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int i, n;
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static kvm_t *kd = NULL;
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struct kvm_swap kswap[16];
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if (kd == NULL)
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kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, NULL);
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n = kvm_getswapinfo(kd, kswap, sizeof(kswap) / sizeof(kswap[0]), 0);
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swapUsed = swapTotal = swapFree = 0;
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/*
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* Count up free swap space.
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*/
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for (i = 0; i < n; ++i)
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swapFree += kswap[i].ksw_total - kswap[i].ksw_used;
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/*
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* Count up total swap space
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*/
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for (i = 0; i < n; i++)
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swapTotal += kswap[i].ksw_total;
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/*
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* Calculate used swap space
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*/
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swapUsed = swapTotal - swapFree;
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/*
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* Convert to kb
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*/
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pagesize = getpagesize() / 1024;
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swapTotal *= pagesize;
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swapUsed *= pagesize;
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swapFree *= pagesize;
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}
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#endif
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/*
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* var_extensible_mem(...
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* Arguments:
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* vp IN - pointer to variable entry that points here
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* name IN/OUT - IN/name requested, OUT/name found
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* length IN/OUT - length of IN/OUT oid's
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* exact IN - TRUE if an exact match was requested
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* var_len OUT - length of variable or 0 if function returned
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* write_method
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*
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*/
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static unsigned char *
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var_extensible_mem(struct variable *vp,
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oid * name,
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size_t * length,
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int exact,
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size_t * var_len, WriteMethod ** write_method)
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{
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static long long_ret;
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static char errmsg[1024];
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#ifdef dragonfly
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static struct vmstats mem;
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size_t vmstats_size = sizeof(mem);
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#endif
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static struct vmmeter mem;
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#endif
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static struct vmtotal total;
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size_t total_size = sizeof(total);
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int total_mib[] = { CTL_VM, VM_METER };
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u_long phys_mem;
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size_t phys_mem_size = sizeof(phys_mem);
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int phys_mem_mib[] = { CTL_HW, HW_PHYSMEM };
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#ifdef BUFSPACE_SYMBOL
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long bufspace;
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#endif
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if (header_generic(vp, name, length, exact, var_len, write_method))
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return (NULL);
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/*
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* Memory info
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*/
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#ifdef dragonfly
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sysctlbyname("vm.vmstats", &vmstats, &vmstats_size, NULL, 0);
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#else
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auto_nlist(SUM_SYMBOL, (char *) &mem, sizeof(mem));
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#endif
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sysctl(total_mib, 2, &total, &total_size, NULL, 0);
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/*
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* Swap info
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*/
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swapmode();
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/*
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* getSwap();
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*/
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/*
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* Physical memory
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*/
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sysctl(phys_mem_mib, 2, &phys_mem, &phys_mem_size, NULL, 0);
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#ifdef BUFSPACE_SYMBOL
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/*
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* Buffer space
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*/
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auto_nlist(BUFSPACE_SYMBOL, (char *) &bufspace, sizeof(bufspace));
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#endif
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long_ret = 0; /* set to 0 as default */
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/*
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* Page-to-kb macro
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*/
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#define ptok(p) ((p) * (mem.v_page_size >> 10))
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switch (vp->magic) {
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case MIBINDEX:
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long_ret = 0;
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return ((u_char *) (&long_ret));
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case ERRORNAME: /* dummy name */
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sprintf(errmsg, "swap");
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*var_len = strlen(errmsg);
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return ((u_char *) (errmsg));
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case MEMTOTALSWAP:
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long_ret = swapTotal;
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return ((u_char *) (&long_ret));
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case MEMAVAILSWAP: /* FREE swap memory */
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long_ret = swapFree;
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return ((u_char *) (&long_ret));
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case MEMTOTALREAL:
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long_ret = phys_mem >> 10;
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return ((u_char *) (&long_ret));
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case MEMAVAILREAL: /* FREE real memory */
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long_ret = ptok(mem.v_free_count);
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return ((u_char *) (&long_ret));
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/*
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* these are not implemented
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*/
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case MEMTOTALSWAPTXT:
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case MEMUSEDSWAPTXT:
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case MEMTOTALREALTXT:
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case MEMUSEDREALTXT:
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#if NETSNMP_NO_DUMMY_VALUES
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return NULL;
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#endif
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long_ret = -1;
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return ((u_char *) (&long_ret));
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case MEMTOTALFREE:
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long_ret = ptok((int) total.t_free);
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return ((u_char *) (&long_ret));
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case MEMSWAPMINIMUM:
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long_ret = minimumswap;
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return ((u_char *) (&long_ret));
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case MEMSHARED:
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long_ret = ptok(total.t_vmshr +
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total.t_avmshr + total.t_rmshr + total.t_armshr);
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return ((u_char *) (&long_ret));
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#ifdef BUFSPACE_SYMBOL
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case MEMBUFFER:
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long_ret = bufspace >> 10;
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return ((u_char *) (&long_ret));
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#endif
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#ifndef openbsd2
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case MEMCACHED:
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#ifdef darwin
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long_ret = ptok(mem.v_lookups);
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#elif defined(dragonfly)
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long_ret = ptok(mem.v_cache_count);
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#else
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long_ret = ptok(mem.v_cache_count) + ptok(mem.v_inactive_count);
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#endif
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return ((u_char *) (&long_ret));
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#endif
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case ERRORFLAG:
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long_ret = (swapFree > minimumswap) ? 0 : 1;
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return ((u_char *) (&long_ret));
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case ERRORMSG:
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if (swapFree < minimumswap)
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sprintf(errmsg, "Running out of swap space (%qd)", swapFree);
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else
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errmsg[0] = 0;
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*var_len = strlen(errmsg);
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return ((u_char *) (errmsg));
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}
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return NULL;
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}
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