test/test41.c

   1 /* Tests for getitimer(2)/setitimer(2) - by D.C. van Moolenbroek */
   2 /* Warning: this test deals with (real and virtual) time, and, lacking a proper
   3  * point of reference, its correctness depends on circumstances like CPU speed
   4  * and system load. A succeeding test run says a lot - failure not so much. */
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8 #include <time.h>
   9 #include <minix/config.h>
  10 #include <sys/types.h>
  11 #include <sys/time.h>
  12 #include <sys/wait.h>
  13 #include <sys/syslimits.h>
  14 #include <signal.h>
  15 #include <unistd.h>
  16 #include <errno.h>
  17
  18 #define ITERATIONS 3
  19 int max_error = 4;
  20 #include "common.h"
  21
  22
  23
  24 /* we have to keep in mind the millisecond values are rounded up */
  25 #define UPPERUSEC(us) ((us)+(1000000/system_hz))
  26 #define EQUSEC(l,r) \
  27   ((l) <= ((r) + (1000000/system_hz)) && (l) >= ((r) - (1000000/system_hz)))
  28
  29 #define FILLITIMER(it, vs, vu, is, iu) \
  30   (it).it_value.tv_sec = (vs); \
  31   (it).it_value.tv_usec = (vu); \
  32   (it).it_interval.tv_sec = (is); \
  33   (it).it_interval.tv_usec = (iu);
  34
  35 /* these two macros are not fully working for all possible values;
  36  * the tests only use values that the macros can deal with, though. */
  37 #define EQITIMER(it, vs, vu, is, iu) \
  38   ((it).it_value.tv_sec == (vs) && EQUSEC((it).it_value.tv_usec,vu) && \
  39   (it).it_interval.tv_sec == (is) && (it).it_interval.tv_usec == (iu))
  40
  41 #define LEITIMER(it, vs, vu, is, iu) \
  42   ((it).it_value.tv_sec > 0 && ((it).it_value.tv_sec < (vs) || \
  43   ((it).it_value.tv_sec == (vs) && (it).it_value.tv_usec <= \
  44    UPPERUSEC(vu))) && \
  45   (it).it_interval.tv_sec == (is) && EQUSEC((it).it_interval.tv_usec,iu))
  46
  47 int main(int argc, char **argv);
  48 void test(int m, int t);
  49 void test_which(void);
  50 void test_getset(void);
  51 void test_neglarge(void);
  52 void test_zero(void);
  53 void test_timer(void);
  54 void test_alarm(void);
  55 void test_fork(void);
  56 void test_exec(void);
  57 int do_check(void);
  58 void got_alarm(int sig);
  59 void busy_wait(int secs);
  60 #define my_e(n) do { printf("Timer %s, ", names[timer]); e(n); } while(0)
  61
  62 static char *executable;
  63 static int signals;
  64 static int timer;
  65 static long system_hz;
  66
  67 static int sigs[] = { SIGALRM, SIGVTALRM, SIGPROF };
  68 static const char *names[] = { "REAL", "VIRTUAL", "PROF" };
  69
  70 int main(argc, argv)
  71 int argc;
  72 char **argv;
  73 {
  74   int i, m = 0xFFFF, n = 0xF;
  75   char cp_cmd[NAME_MAX+10];
  76
  77   system_hz = sysconf(_SC_CLK_TCK);
  78
  79   if (strcmp(argv[0], "DO CHECK") == 0) {
  80         timer = atoi(argv[1]);
  81
  82         exit(do_check());
  83   }
  84
  85   executable = argv[0];
  86
  87   start(41);
  88
  89   snprintf(cp_cmd, sizeof(cp_cmd), "cp ../%s .", executable);
  90   system(cp_cmd);
  91
  92   if (argc >= 2) m = atoi(argv[1]);
  93   if (argc >= 3) n = atoi(argv[2]);
  94
  95   for (i = 0; i < ITERATIONS; i++) {
  96         if (n & 1) test(m, ITIMER_REAL);
  97         if (n & 2) test(m, ITIMER_VIRTUAL);
  98         if (n & 4) test(m, ITIMER_PROF);
  99   }
 100
 101   quit();
 102   return(-1);                   /* impossible */
 103 }
 104
 105 void test(m, t)
 106 int m;
 107 int t;
 108 {
 109   timer = t;
 110
 111   if (m & 0001) test_which();
 112   if (m & 0002) test_getset();
 113   if (m & 0004) test_neglarge();
 114   if (m & 0010) test_zero();
 115   if (m & 0020) test_timer();
 116   if (m & 0040) test_alarm();
 117   if (m & 0100) test_fork();
 118   if (m & 0200) test_exec();
 119 }
 120
 121 /* test invalid and unsupported 'which' values */
 122 void test_which()
 123 {
 124   struct itimerval it;
 125
 126   subtest = 0;
 127
 128   errno = 0; if (!getitimer(-1, &it) || errno != EINVAL) my_e(1);
 129   errno = 0; if ( getitimer(timer, &it)                ) my_e(2);
 130   errno = 0; if (!getitimer( 3, &it) || errno != EINVAL) my_e(3);
 131 }
 132
 133 /* test if we get back what we set */
 134 void test_getset()
 135 {
 136   struct itimerval it, oit;
 137
 138   subtest = 1;
 139
 140   /* no alarm should be set initially */
 141   if (getitimer(timer, &it)) my_e(1);
 142   if (!EQITIMER(it, 0, 0, 0, 0)) my_e(2);
 143
 144   if (setitimer(timer, &it, &oit)) my_e(3);
 145   if (setitimer(timer, &oit, NULL)) my_e(4);
 146   if (!EQITIMER(oit, 0, 0, 0, 0)) my_e(5);
 147
 148   FILLITIMER(it, 123, 0, 456, 0);
 149   if (setitimer(timer, &it, NULL)) my_e(6);
 150
 151   FILLITIMER(it, 987, 0, 654, 0);
 152   if (setitimer(timer, &it, &oit)) my_e(7);
 153   if (!LEITIMER(oit, 123, 0, 456, 0)) my_e(8);
 154
 155   if (getitimer(timer, &oit)) my_e(9);
 156   if (!LEITIMER(oit, 987, 0, 654, 0)) my_e(10);
 157
 158   FILLITIMER(it, 0, 0, 0, 0);
 159   if (setitimer(timer, &it, &oit)) my_e(11);
 160   if (!LEITIMER(oit, 987, 0, 654, 0)) my_e(12);
 161
 162   if (getitimer(timer, &oit)) my_e(13);
 163   if (!EQITIMER(oit, 0, 0, 0, 0)) my_e(14);
 164 }
 165
 166 /* test negative/large values */
 167 void test_neglarge()
 168 {
 169   struct itimerval it;
 170
 171   subtest = 2;
 172
 173   FILLITIMER(it, 4, 0, 5, 0);
 174   if (setitimer(timer, &it, NULL)) my_e(1);
 175
 176   FILLITIMER(it, 1000000000, 0, 0, 0);
 177   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(2);
 178
 179   FILLITIMER(it, 0, 1000000, 0, 0);
 180   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(3);
 181
 182   FILLITIMER(it, 0, 0, 0, 1000000);
 183   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(4);
 184
 185   FILLITIMER(it, -1, 0, 0, 0);
 186   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(5);
 187
 188   FILLITIMER(it, 0, -1, 0, 0);
 189   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(6);
 190
 191   FILLITIMER(it, 0, 0, -1, 0);
 192   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(7);
 193
 194   FILLITIMER(it, 0, 0, 0, -1);
 195   if (!setitimer(timer, &it, NULL) || errno != EINVAL) my_e(8);
 196
 197   if (getitimer(timer, &it)) my_e(9);
 198   if (!LEITIMER(it, 4, 0, 5, 0)) my_e(10);
 199 }
 200
 201 /* setitimer with a zero timer has to set the interval to zero as well */
 202 void test_zero()
 203 {
 204   struct itimerval it;
 205
 206   subtest = 3;
 207
 208   it.it_value.tv_sec = 0;
 209   it.it_value.tv_usec = 0;
 210   it.it_interval.tv_sec = 1;
 211   it.it_interval.tv_usec = 1;
 212
 213   if (setitimer(timer, &it, NULL)) my_e(1);
 214   if (getitimer(timer, &it)) my_e(2);
 215   if (!EQITIMER(it, 0, 0, 0, 0)) my_e(3);
 216 }
 217
 218 /* test actual timer functioning */
 219 void test_timer()
 220 {
 221   struct itimerval it;
 222
 223   subtest = 4;
 224
 225   if (signal(sigs[timer], got_alarm) == SIG_ERR) my_e(1);
 226
 227   FILLITIMER(it, 0, 100000, 0, 100000);
 228
 229   if (setitimer(timer, &it, NULL)) my_e(2);
 230
 231   signals = 0;
 232   busy_wait(1);
 233
 234   FILLITIMER(it, 0, 0, 0, 0);
 235   if (setitimer(timer, &it, NULL)) my_e(3);
 236
 237   /* we don't know how many signals we'll actually get in practice,
 238    * so these checks more or less cover the extremes of the acceptable */
 239   if (signals < 2) my_e(4);
 240   if (signals > system_hz * 2) my_e(5);
 241
 242   /* only for REAL timer can we check against the clock */
 243   if (timer == ITIMER_REAL) {
 244         FILLITIMER(it, 1, 0, 0, 0);
 245         if (setitimer(timer, &it, NULL)) my_e(6);
 246
 247         signals = 0;
 248         busy_wait(1);
 249
 250         FILLITIMER(it, 0, 0, 0, 0);
 251         if (setitimer(timer, &it, NULL)) my_e(7);
 252
 253         if (signals != 1) my_e(8);
 254   }
 255
 256   signals = 0;
 257   busy_wait(1);
 258
 259   if (signals != 0) my_e(9);
 260 }
 261
 262 /* test itimer/alarm interaction */
 263 void test_alarm(void) {
 264   struct itimerval it;
 265
 266   /* only applicable for ITIMER_REAL */
 267   if (timer != ITIMER_REAL) return;
 268
 269   subtest = 5;
 270
 271   if (signal(SIGALRM, got_alarm) == SIG_ERR) my_e(1);
 272
 273   FILLITIMER(it, 3, 0, 1, 0);
 274   if (setitimer(timer, &it, NULL)) my_e(2);
 275
 276   if (alarm(2) != 3) my_e(3);
 277
 278   if (getitimer(timer, &it)) my_e(4);
 279   if (!LEITIMER(it, 2, 0, 0, 0)) my_e(5);
 280
 281   signals = 0;
 282   busy_wait(5);
 283
 284   if (signals != 1) my_e(6);
 285
 286   if (getitimer(timer, &it)) my_e(7);
 287   if (!EQITIMER(it, 0, 0, 0, 0)) my_e(8);
 288 }
 289
 290 /* test that the timer is reset on forking */
 291 void test_fork(void) {
 292   struct itimerval it, oit;
 293   pid_t pid;
 294   int status;
 295
 296   subtest = 6;
 297
 298   FILLITIMER(it, 12, 34, 56, 78);
 299
 300   if (setitimer(timer, &it, NULL)) my_e(1);
 301
 302   pid = fork();
 303   if (pid < 0) my_e(2);
 304
 305   if (pid == 0) {
 306     if (getitimer(timer, &it)) exit(5);
 307     if (!EQITIMER(it, 0, 0, 0, 0)) exit(6);
 308
 309     exit(0);
 310   }
 311
 312   if (wait(&status) != pid) my_e(3);
 313   if (!WIFEXITED(status)) my_e(4);
 314   if (WEXITSTATUS(status) != 0) my_e(WEXITSTATUS(status));
 315
 316   FILLITIMER(it, 0, 0, 0, 0);
 317   if (setitimer(timer, &it, &oit)) my_e(7);
 318   if (!LEITIMER(oit, 12, 34, 56, 78)) my_e(8);
 319 }
 320
 321 /* test if timer is carried over to exec()'ed process */
 322 void test_exec(void) {
 323   struct itimerval it;
 324   pid_t pid;
 325   int status;
 326   char buf[2];
 327
 328   subtest = 7;
 329
 330   pid = fork();
 331   if (pid < 0) my_e(1);
 332
 333   if (pid == 0) {
 334     FILLITIMER(it, 3, 0, 1, 0);
 335     if (setitimer(timer, &it, NULL)) exit(2);
 336
 337     sprintf(buf, "%d", timer);
 338     execl(executable, "DO CHECK", buf, NULL);
 339
 340     exit(3);
 341   }
 342
 343   if (wait(&status) != pid) my_e(4);
 344   if (WIFSIGNALED(status)) {
 345     /* process should have died from corresponding signal */
 346     if (WTERMSIG(status) != sigs[timer]) my_e(5);
 347   }
 348   else {
 349     if (WIFEXITED(status)) my_e(WEXITSTATUS(status));
 350     else my_e(6);
 351   }
 352 }
 353
 354 /* procedure of the exec()'ed process */
 355 int do_check()
 356 {
 357   struct itimerval it;
 358
 359   if (getitimer(timer, &it)) return(81);
 360   if (!LEITIMER(it, 3, 0, 1, 0)) return(82);
 361
 362   busy_wait(60);
 363
 364   return(83);
 365 }
 366
 367 void busy_wait(secs)
 368 int secs;
 369 {
 370   time_t now, exp;
 371   int i;
 372
 373   exp = time(&now) + secs + 1;
 374
 375   while (now < exp) {
 376         for (i = 0; i < 100000; i++);
 377
 378         time(&now);
 379   }
 380 }
 381
 382 void got_alarm(sig)
 383 int sig;
 384 {
 385   if (sig != sigs[timer]) my_e(1001);
 386
 387   signals++;
 388 }
 389