contrib/sendmail-8.14/libsm/t-sem.c

   1 /*
   2  * Copyright (c) 2000-2001, 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: t-sem.c,v 1.16 2007/03/21 23:22:10 ca Exp $")
  12
  13 #include <stdio.h>
  14
  15 #if SM_CONF_SEM
  16 # include <stdlib.h>
  17 # include <unistd.h>
  18 # include <sysexits.h>
  19 # include <sm/heap.h>
  20 # include <sm/string.h>
  21 # include <sm/signal.h>
  22 # include <sm/test.h>
  23 # include <sm/sem.h>
  24
  25 # define T_SM_SEM_KEY (4321L)
  26
  27 static void
  28 delay(t, s)
  29         int t;
  30         char *s;
  31 {
  32         if (t > 0)
  33         {
  34 #if DEBUG
  35                 fprintf(stderr, "sleep(%d) before %s\n", t, s);
  36 #endif /* DEBUG */
  37                 sleep(t);
  38         }
  39 #if DEBUG
  40         fprintf(stderr, "%s\n", s);
  41 #endif /* DEBUG */
  42 }
  43
  44
  45 /*
  46 **  SEMINTER -- interactive testing of semaphores.
  47 **
  48 **      Parameters:
  49 **              owner -- create semaphores.
  50 **
  51 **      Returns:
  52 **              0 on success
  53 **              < 0 on failure.
  54 */
  55
  56 static int
  57 seminter(owner)
  58         bool owner;
  59 {
  60         int semid;
  61         int t;
  62
  63         semid = sm_sem_start(T_SM_SEM_KEY, SM_NSEM, 0, owner);
  64         if (semid < 0)
  65         {
  66                 perror("sm_sem_start failed");
  67                 return 1;
  68         }
  69
  70         while ((t = getchar()) != EOF)
  71         {
  72                 switch (t)
  73                 {
  74                   case 'a':
  75                         delay(0, "try to acq");
  76                         if (sm_sem_acq(semid, 0, 2) < 0)
  77                         {
  78                                 perror("sm_sem_acq failed");
  79                                 return 1;
  80                         }
  81                         delay(0, "acquired");
  82                         break;
  83
  84                   case 'r':
  85                         delay(0, "try to rel");
  86                         if (sm_sem_rel(semid, 0, 2) < 0)
  87                         {
  88                                 perror("sm_sem_rel failed");
  89                                 return 1;
  90                         }
  91                         delay(0, "released");
  92                         break;
  93
  94                   case 'v':
  95                         if ((t = sm_sem_get(semid, 0)) < 0)
  96                         {
  97                                 perror("get_sem failed");
  98                                 return 1;
  99                         }
 100                         printf("semval: %d\n", t);
 101                         break;
 102
 103                 }
 104         }
 105         if (owner)
 106                 return sm_sem_stop(semid);
 107         return 0;
 108 }
 109
 110 /*
 111 **  SEM_CLEANUP -- cleanup if something breaks
 112 **
 113 **      Parameters:
 114 **              sig -- signal.
 115 **
 116 **      Returns:
 117 **              none.
 118 */
 119
 120 static int semid_c = -1;
 121 void
 122 sem_cleanup(sig)
 123         int sig;
 124 {
 125         if (semid_c >= 0)
 126                 (void) sm_sem_stop(semid_c);
 127         exit(EX_UNAVAILABLE);
 128 }
 129
 130 /*
 131 **  SEMTEST -- test of semaphores
 132 **
 133 **      Parameters:
 134 **              owner -- create semaphores.
 135 **
 136 **      Returns:
 137 **              0 on success
 138 **              < 0 on failure.
 139 */
 140
 141 # define MAX_CNT        10
 142
 143 static int
 144 semtest(owner)
 145         int owner;
 146 {
 147         int semid, r;
 148         int cnt = 0;
 149
 150         semid = sm_sem_start(T_SM_SEM_KEY, 1, 0, owner);
 151         if (semid < 0)
 152         {
 153                 perror("sm_sem_start failed");
 154                 return -1;
 155         }
 156
 157         if (owner)
 158         {
 159                 /* just in case someone kills the program... */
 160                 semid_c = semid;
 161                 (void) sm_signal(SIGHUP, sem_cleanup);
 162                 (void) sm_signal(SIGINT, sem_cleanup);
 163                 (void) sm_signal(SIGTERM, sem_cleanup);
 164
 165                 delay(1, "parent: acquire 1");
 166                 cnt = 0;
 167                 do
 168                 {
 169                         r = sm_sem_acq(semid, 0, 0);
 170                         if (r < 0)
 171                         {
 172                                 sleep(1);
 173                                 ++cnt;
 174                         }
 175                 } while (r < 0 && cnt <= MAX_CNT);
 176                 SM_TEST(r >= 0);
 177                 if (r < 0)
 178                         return r;
 179
 180                 delay(3, "parent: release 1");
 181                 cnt = 0;
 182                 do
 183                 {
 184                         r = sm_sem_rel(semid, 0, 0);
 185                         if (r < 0)
 186                         {
 187                                 sleep(1);
 188                                 ++cnt;
 189                         }
 190                 } while (r < 0 && cnt <= MAX_CNT);
 191                 SM_TEST(r >= 0);
 192                 if (r < 0)
 193                         return r;
 194
 195                 delay(1, "parent: getval");
 196                 cnt = 0;
 197                 do
 198                 {
 199                         r = sm_sem_get(semid, 0);
 200                         if (r <= 0)
 201                         {
 202                                 sleep(1);
 203                                 ++cnt;
 204                         }
 205                 } while (r <= 0 && cnt <= MAX_CNT);
 206                 SM_TEST(r > 0);
 207                 if (r <= 0)
 208                         return r;
 209
 210                 delay(1, "parent: acquire 2");
 211                 cnt = 0;
 212                 do
 213                 {
 214                         r = sm_sem_acq(semid, 0, 0);
 215                         if (r < 0)
 216                         {
 217                                 sleep(1);
 218                                 ++cnt;
 219                         }
 220                 } while (r < 0 && cnt <= MAX_CNT);
 221                 SM_TEST(r >= 0);
 222                 if (r < 0)
 223                         return r;
 224
 225                 cnt = 0;
 226                 do
 227                 {
 228                         r = sm_sem_rel(semid, 0, 0);
 229                         if (r < 0)
 230                         {
 231                                 sleep(1);
 232                                 ++cnt;
 233                         }
 234                 } while (r < 0 && cnt <= MAX_CNT);
 235                 SM_TEST(r >= 0);
 236                 if (r < 0)
 237                         return r;
 238         }
 239         else
 240         {
 241                 delay(1, "child: acquire 1");
 242                 cnt = 0;
 243                 do
 244                 {
 245                         r = sm_sem_acq(semid, 0, 0);
 246                         if (r < 0)
 247                         {
 248                                 sleep(1);
 249                                 ++cnt;
 250                         }
 251                 } while (r < 0 && cnt <= MAX_CNT);
 252                 SM_TEST(r >= 0);
 253                 if (r < 0)
 254                         return r;
 255
 256                 delay(1, "child: release 1");
 257                 cnt = 0;
 258                 do
 259                 {
 260                         r = sm_sem_rel(semid, 0, 0);
 261                         if (r < 0)
 262                         {
 263                                 sleep(1);
 264                                 ++cnt;
 265                         }
 266                 } while (r < 0 && cnt <= MAX_CNT);
 267                 SM_TEST(r >= 0);
 268                 if (r < 0)
 269                         return r;
 270
 271         }
 272         if (owner)
 273                 return sm_sem_stop(semid);
 274         return 0;
 275 }
 276
 277 int
 278 main(argc, argv)
 279         int argc;
 280         char *argv[];
 281 {
 282         bool interactive = false;
 283         bool owner = false;
 284         int ch;
 285         int r = 0;
 286
 287 # define OPTIONS        "io"
 288         while ((ch = getopt(argc, argv, OPTIONS)) != -1)
 289         {
 290                 switch ((char) ch)
 291                 {
 292                   case 'i':
 293                         interactive = true;
 294                         break;
 295
 296                   case 'o':
 297                         owner = true;
 298                         break;
 299
 300                   default:
 301                         break;
 302                 }
 303         }
 304
 305         if (interactive)
 306                 r = seminter(owner);
 307         else
 308         {
 309                 pid_t pid;
 310
 311                 printf("This test takes about 8 seconds.\n");
 312                 printf("If it takes longer than 30 seconds, please interrupt it\n");
 313                 printf("and compile again without semaphore support, i.e.,");
 314                 printf("-DSM_CONF_SEM=0\n");
 315                 if ((pid = fork()) < 0)
 316                 {
 317                         perror("fork failed\n");
 318                         return -1;
 319                 }
 320
 321                 sm_test_begin(argc, argv, "test semaphores");
 322                 if (pid == 0)
 323                 {
 324                         /* give the parent the chance to setup data */
 325                         sleep(1);
 326                         r = semtest(false);
 327                 }
 328                 else
 329                 {
 330                         r = semtest(true);
 331                 }
 332                 SM_TEST(r == 0);
 333                 return sm_test_end();
 334         }
 335         return r;
 336 }
 337 #else /* SM_CONF_SEM */
 338 int
 339 main(argc, argv)
 340         int argc;
 341         char *argv[];
 342 {
 343         printf("No support for semaphores configured on this machine\n");
 344         return 0;
 345 }
 346 #endif /* SM_CONF_SEM */