contrib/sendmail-8.14/libsm/memstat.c

   1 /*
   2  * Copyright (c) 2005-2007 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  *
   5  * By using this file, you agree to the terms and conditions set
   6  * forth in the LICENSE file which can be found at the top level of
   7  * the sendmail distribution.
   8  */
   9
  10 #include <sm/gen.h>
  11 SM_RCSID("@(#)$Id: memstat.c,v 1.6 2007/03/20 23:26:12 ca Exp $")
  12
  13 #include <errno.h>
  14 #include <sm/misc.h>
  15
  16 #if USESWAPCTL
  17 #include <sys/stat.h>
  18 #include <sys/swap.h>
  19
  20 static long sc_page_size;
  21
  22 /*
  23 **  SM_MEMSTAT_OPEN -- open memory statistics
  24 **
  25 **      Parameters:
  26 **              none
  27 **
  28 **      Results:
  29 **              errno as error code, 0: ok
  30 */
  31
  32 int
  33 sm_memstat_open()
  34 {
  35         sc_page_size = sysconf(_SC_PAGE_SIZE);
  36         if (sc_page_size == -1)
  37                 return (errno != 0) ? errno : -1;
  38         return 0;
  39 }
  40
  41 /*
  42 **  SM_MEMSTAT_CLOSE -- close memory statistics
  43 **
  44 **      Parameters:
  45 **              none
  46 **
  47 **      Results:
  48 **              errno as error code, 0: ok
  49 */
  50
  51 int
  52 sm_memstat_close()
  53 {
  54         return 0;
  55 }
  56
  57 /*
  58 **  SM_MEMSTAT_GET -- get memory statistics
  59 **
  60 **      Parameters:
  61 **              resource -- resource to look up
  62 **              pvalue -- (pointer to) memory statistics value (output)
  63 **
  64 **      Results:
  65 **              0: success
  66 **              !=0: error
  67 */
  68
  69 int
  70 sm_memstat_get(resource, pvalue)
  71         char *resource;
  72         long *pvalue;
  73 {
  74         int r;
  75         struct anoninfo ai;
  76
  77         r = swapctl(SC_AINFO, &ai);
  78         if (r == -1)
  79                 return (errno != 0) ? errno : -1;
  80         r = ai.ani_max - ai.ani_resv;
  81         r *= sc_page_size >> 10;
  82         *pvalue = r;
  83         return 0;
  84 }
  85
  86 #elif USEKSTAT
  87
  88 #include <kstat.h>
  89 #include <sys/sysinfo.h>
  90
  91 static kstat_ctl_t *kc;
  92 static kstat_t *kst;
  93
  94 /*
  95 **  SM_MEMSTAT_OPEN -- open memory statistics
  96 **
  97 **      Parameters:
  98 **              none
  99 **
 100 **      Results:
 101 **              errno as error code, 0: ok
 102 */
 103
 104 int
 105 sm_memstat_open()
 106 {
 107         kstat_named_t *kn;
 108
 109         kc = kstat_open();
 110         if (kc == NULL)
 111                 return (errno != 0) ? errno : -1;
 112         kst = kstat_lookup(kc, "unix", 0,
 113                 (name != NULL) ? name : "system_pages");
 114         if (kst == 0)
 115                 return (errno != 0) ? errno : -2;
 116         return 0;
 117 }
 118
 119 /*
 120 **  SM_MEMSTAT_CLOSE -- close memory statistics
 121 **
 122 **      Parameters:
 123 **              none
 124 **
 125 **      Results:
 126 **              errno as error code, 0: ok
 127 */
 128
 129 int
 130 sm_memstat_close()
 131 {
 132         int r;
 133
 134         if (kc == NULL)
 135                 return 0;
 136         r = kstat_close(kc);
 137         if (r != 0)
 138                 return (errno != 0) ? errno : -1;
 139         return 0;
 140 }
 141
 142 /*
 143 **  SM_MEMSTAT_GET -- get memory statistics
 144 **
 145 **      Parameters:
 146 **              resource -- resource to look up
 147 **              pvalue -- (pointer to) memory statistics value (output)
 148 **
 149 **      Results:
 150 **              0: success
 151 **              !=0: error
 152 */
 153
 154 int
 155 sm_memstat_get(resource, pvalue)
 156         char *resource;
 157         long *pvalue;
 158 {
 159         int r;
 160         kstat_named_t *kn;
 161
 162         if (kc == NULL || kst == NULL)
 163                 return -1;
 164         if (kstat_read(kc, kst, NULL) == -1)
 165                 return (errno != 0) ? errno : -2;
 166         kn = kstat_data_lookup(kst,
 167                         (resource != NULL) ? resource: "freemem");
 168         if (kn == NULL)
 169                 return (errno != 0) ? errno : -3;
 170         *pvalue = kn->value.ul;
 171         return 0;
 172 }
 173
 174 #elif USEPROCMEMINFO
 175
 176 /*
 177 /proc/meminfo?
 178         total:    used:    free:  shared: buffers:  cached:
 179 Mem:  261468160 252149760  9318400        0  3854336 109813760
 180 Swap: 1052794880 62185472 990609408
 181 MemTotal:       255340 kB
 182 MemFree:          9100 kB
 183 MemShared:           0 kB
 184 Buffers:          3764 kB
 185 Cached:         107240 kB
 186 Active:         104340 kB
 187 Inact_dirty:      4220 kB
 188 Inact_clean:      2444 kB
 189 Inact_target:     4092 kB
 190 HighTotal:           0 kB
 191 HighFree:            0 kB
 192 LowTotal:       255340 kB
 193 LowFree:          9100 kB
 194 SwapTotal:     1028120 kB
 195 SwapFree:       967392 kB
 196 */
 197
 198 #include <stdio.h>
 199 #include <string.h>
 200 static FILE *fp;
 201
 202 /*
 203 **  SM_MEMSTAT_OPEN -- open memory statistics
 204 **
 205 **      Parameters:
 206 **              none
 207 **
 208 **      Results:
 209 **              errno as error code, 0: ok
 210 */
 211
 212 int
 213 sm_memstat_open()
 214 {
 215         fp = fopen("/proc/meminfo", "r");
 216         return (fp != NULL) ? 0 : errno;
 217 }
 218
 219 /*
 220 **  SM_MEMSTAT_CLOSE -- close memory statistics
 221 **
 222 **      Parameters:
 223 **              none
 224 **
 225 **      Results:
 226 **              errno as error code, 0: ok
 227 */
 228
 229 int
 230 sm_memstat_close()
 231 {
 232         if (fp != NULL)
 233         {
 234                 fclose(fp);
 235                 fp = NULL;
 236         }
 237         return 0;
 238 }
 239
 240 /*
 241 **  SM_MEMSTAT_GET -- get memory statistics
 242 **
 243 **      Parameters:
 244 **              resource -- resource to look up
 245 **              pvalue -- (pointer to) memory statistics value (output)
 246 **
 247 **      Results:
 248 **              0: success
 249 **              !=0: error
 250 */
 251
 252 int
 253 sm_memstat_get(resource, pvalue)
 254         char *resource;
 255         long *pvalue;
 256 {
 257         int r;
 258         size_t l;
 259         char buf[80];
 260
 261         if (resource == NULL)
 262                 return EINVAL;
 263         if (pvalue == NULL)
 264                 return EINVAL;
 265         if (fp == NULL)
 266                 return -1;      /* try to reopen? */
 267         rewind(fp);
 268         l = strlen(resource);
 269         if (l >= sizeof(buf))
 270                 return EINVAL;
 271         while (fgets(buf, sizeof(buf), fp) != NULL)
 272         {
 273                 if (strncmp(buf, resource, l) == 0 && buf[l] == ':')
 274                 {
 275                         r = sscanf(buf + l + 1, "%ld", pvalue);
 276                         return (r > 0) ? 0 : -1;
 277                 }
 278         }
 279         return 0;
 280 }
 281
 282 #else /* USEPROCMEMINFO */
 283
 284 /*
 285 **  SM_MEMSTAT_OPEN -- open memory statistics
 286 **
 287 **      Parameters:
 288 **              none
 289 **
 290 **      Results:
 291 **              errno as error code, 0: ok
 292 */
 293
 294 int
 295 sm_memstat_open()
 296 {
 297         return -1;
 298 }
 299
 300 /*
 301 **  SM_MEMSTAT_CLOSE -- close memory statistics
 302 **
 303 **      Parameters:
 304 **              none
 305 **
 306 **      Results:
 307 **              errno as error code, 0: ok
 308 */
 309
 310 int
 311 sm_memstat_close()
 312 {
 313         return 0;
 314 }
 315
 316 /*
 317 **  SM_MEMSTAT_GET -- get memory statistics
 318 **
 319 **      Parameters:
 320 **              resource -- resource to look up
 321 **              pvalue -- (pointer to) memory statistics value (output)
 322 **
 323 **      Results:
 324 **              0: success
 325 **              !=0: error
 326 */
 327
 328 int
 329 sm_memstat_get(resource, pvalue)
 330         char *resource;
 331         long *pvalue;
 332 {
 333         return -1;
 334 }
 335
 336 #endif /* USEKSTAT */