memstat.c revision 4aac33d31b41cc7e3ac6fb66747ff2cae63d08cf
/*
* Copyright (c) 2005-2007 Sendmail, Inc. and its suppliers.
* All rights reserved.
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the sendmail distribution.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sm/gen.h>
SM_RCSID("@(#)$Id: memstat.c,v 1.6 2007/03/20 23:26:12 ca Exp $")
#include <errno.h>
#include <sm/misc.h>
#if USESWAPCTL
#include <sys/stat.h>
#include <sys/swap.h>
static long sc_page_size;
/*
** SM_MEMSTAT_OPEN -- open memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_open()
{
sc_page_size = sysconf(_SC_PAGE_SIZE);
if (sc_page_size == -1)
return (errno != 0) ? errno : -1;
return 0;
}
/*
** SM_MEMSTAT_CLOSE -- close memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_close()
{
return 0;
}
/*
** SM_MEMSTAT_GET -- get memory statistics
**
** Parameters:
** resource -- resource to look up
** pvalue -- (pointer to) memory statistics value (output)
**
** Results:
** 0: success
** !=0: error
*/
int
sm_memstat_get(resource, pvalue)
char *resource;
long *pvalue;
{
int r;
struct anoninfo ai;
r = swapctl(SC_AINFO, &ai);
if (r == -1)
return (errno != 0) ? errno : -1;
r = ai.ani_max - ai.ani_resv;
r *= sc_page_size >> 10;
*pvalue = r;
return 0;
}
#elif USEKSTAT
#include <kstat.h>
#include <sys/sysinfo.h>
static kstat_ctl_t *kc;
static kstat_t *kst;
/*
** SM_MEMSTAT_OPEN -- open memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_open()
{
kstat_named_t *kn;
kc = kstat_open();
if (kc == NULL)
return (errno != 0) ? errno : -1;
kst = kstat_lookup(kc, "unix", 0,
(name != NULL) ? name : "system_pages");
if (kst == 0)
return (errno != 0) ? errno : -2;
return 0;
}
/*
** SM_MEMSTAT_CLOSE -- close memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_close()
{
int r;
if (kc == NULL)
return 0;
r = kstat_close(kc);
if (r != 0)
return (errno != 0) ? errno : -1;
return 0;
}
/*
** SM_MEMSTAT_GET -- get memory statistics
**
** Parameters:
** resource -- resource to look up
** pvalue -- (pointer to) memory statistics value (output)
**
** Results:
** 0: success
** !=0: error
*/
int
sm_memstat_get(resource, pvalue)
char *resource;
long *pvalue;
{
int r;
kstat_named_t *kn;
if (kc == NULL || kst == NULL)
return -1;
if (kstat_read(kc, kst, NULL) == -1)
return (errno != 0) ? errno : -2;
kn = kstat_data_lookup(kst,
(resource != NULL) ? resource: "freemem");
if (kn == NULL)
return (errno != 0) ? errno : -3;
*pvalue = kn->value.ul;
return 0;
}
#elif USEPROCMEMINFO
/*
/proc/meminfo?
total: used: free: shared: buffers: cached:
Mem: 261468160 252149760 9318400 0 3854336 109813760
Swap: 1052794880 62185472 990609408
MemTotal: 255340 kB
MemFree: 9100 kB
MemShared: 0 kB
Buffers: 3764 kB
Cached: 107240 kB
Active: 104340 kB
Inact_dirty: 4220 kB
Inact_clean: 2444 kB
Inact_target: 4092 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 255340 kB
LowFree: 9100 kB
SwapTotal: 1028120 kB
SwapFree: 967392 kB
*/
#include <stdio.h>
#include <string.h>
static FILE *fp;
/*
** SM_MEMSTAT_OPEN -- open memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_open()
{
fp = fopen("/proc/meminfo", "r");
return (fp != NULL) ? 0 : errno;
}
/*
** SM_MEMSTAT_CLOSE -- close memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_close()
{
if (fp != NULL)
{
fclose(fp);
fp = NULL;
}
return 0;
}
/*
** SM_MEMSTAT_GET -- get memory statistics
**
** Parameters:
** resource -- resource to look up
** pvalue -- (pointer to) memory statistics value (output)
**
** Results:
** 0: success
** !=0: error
*/
int
sm_memstat_get(resource, pvalue)
char *resource;
long *pvalue;
{
int r;
size_t l;
char buf[80];
if (resource == NULL)
return EINVAL;
if (pvalue == NULL)
return EINVAL;
if (fp == NULL)
return -1; /* try to reopen? */
rewind(fp);
l = strlen(resource);
if (l >= sizeof(buf))
return EINVAL;
while (fgets(buf, sizeof(buf), fp) != NULL)
{
if (strncmp(buf, resource, l) == 0 && buf[l] == ':')
{
r = sscanf(buf + l + 1, "%ld", pvalue);
return (r > 0) ? 0 : -1;
}
}
return 0;
}
#else /* USEPROCMEMINFO */
/*
** SM_MEMSTAT_OPEN -- open memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_open()
{
return -1;
}
/*
** SM_MEMSTAT_CLOSE -- close memory statistics
**
** Parameters:
** none
**
** Results:
** errno as error code, 0: ok
*/
int
sm_memstat_close()
{
return 0;
}
/*
** SM_MEMSTAT_GET -- get memory statistics
**
** Parameters:
** resource -- resource to look up
** pvalue -- (pointer to) memory statistics value (output)
**
** Results:
** 0: success
** !=0: error
*/
int
sm_memstat_get(resource, pvalue)
char *resource;
long *pvalue;
{
return -1;
}
#endif /* USEKSTAT */