tools/testing/selftests/nolibc/nolibc-test.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #define _GNU_SOURCE
   4
   5 /* libc-specific include files
   6  * The program may be built in 3 ways:
   7  *   $(CC) -nostdlib -include /path/to/nolibc.h => NOLIBC already defined
   8  *   $(CC) -nostdlib -I/path/to/nolibc/sysroot  => _NOLIBC_* guards are present
   9  *   $(CC) with default libc                    => NOLIBC* never defined
  10  */
  11 #ifndef NOLIBC
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #ifndef _NOLIBC_STDIO_H
  16 /* standard libcs need more includes */
  17 #include <linux/reboot.h>
  18 #include <sys/io.h>
  19 #include <sys/ioctl.h>
  20 #include <sys/mman.h>
  21 #include <sys/mount.h>
  22 #include <sys/prctl.h>
  23 #include <sys/reboot.h>
  24 #include <sys/stat.h>
  25 #include <sys/syscall.h>
  26 #include <sys/sysmacros.h>
  27 #include <sys/time.h>
  28 #include <sys/wait.h>
  29 #include <dirent.h>
  30 #include <errno.h>
  31 #include <fcntl.h>
  32 #include <poll.h>
  33 #include <sched.h>
  34 #include <signal.h>
  35 #include <stdarg.h>
  36 #include <stddef.h>
  37 #include <stdint.h>
  38 #include <unistd.h>
  39 #include <limits.h>
  40 #endif
  41 #endif
  42
  43 /* will be used by nolibc by getenv() */
  44 char **environ;
  45
  46 /* definition of a series of tests */
  47 struct test {
  48         const char *name;              /* test name */
  49         int (*func)(int min, int max); /* handler */
  50 };
  51
  52 #ifndef _NOLIBC_STDLIB_H
  53 char *itoa(int i)
  54 {
  55         static char buf[12];
  56         int ret;
  57
  58         ret = snprintf(buf, sizeof(buf), "%d", i);
  59         return (ret >= 0 && ret < sizeof(buf)) ? buf : "#err";
  60 }
  61 #endif
  62
  63 #define CASE_ERR(err) \
  64         case err: return #err
  65
  66 /* returns the error name (e.g. "ENOENT") for common errors, "SUCCESS" for 0,
  67  * or the decimal value for less common ones.
  68  */
  69 const char *errorname(int err)
  70 {
  71         switch (err) {
  72         case 0: return "SUCCESS";
  73         CASE_ERR(EPERM);
  74         CASE_ERR(ENOENT);
  75         CASE_ERR(ESRCH);
  76         CASE_ERR(EINTR);
  77         CASE_ERR(EIO);
  78         CASE_ERR(ENXIO);
  79         CASE_ERR(E2BIG);
  80         CASE_ERR(ENOEXEC);
  81         CASE_ERR(EBADF);
  82         CASE_ERR(ECHILD);
  83         CASE_ERR(EAGAIN);
  84         CASE_ERR(ENOMEM);
  85         CASE_ERR(EACCES);
  86         CASE_ERR(EFAULT);
  87         CASE_ERR(ENOTBLK);
  88         CASE_ERR(EBUSY);
  89         CASE_ERR(EEXIST);
  90         CASE_ERR(EXDEV);
  91         CASE_ERR(ENODEV);
  92         CASE_ERR(ENOTDIR);
  93         CASE_ERR(EISDIR);
  94         CASE_ERR(EINVAL);
  95         CASE_ERR(ENFILE);
  96         CASE_ERR(EMFILE);
  97         CASE_ERR(ENOTTY);
  98         CASE_ERR(ETXTBSY);
  99         CASE_ERR(EFBIG);
 100         CASE_ERR(ENOSPC);
 101         CASE_ERR(ESPIPE);
 102         CASE_ERR(EROFS);
 103         CASE_ERR(EMLINK);
 104         CASE_ERR(EPIPE);
 105         CASE_ERR(EDOM);
 106         CASE_ERR(ERANGE);
 107         CASE_ERR(ENOSYS);
 108         CASE_ERR(EOVERFLOW);
 109         default:
 110                 return itoa(err);
 111         }
 112 }
 113
 114 static void putcharn(char c, size_t n)
 115 {
 116         char buf[64];
 117
 118         memset(buf, c, n);
 119         buf[n] = '\0';
 120         fputs(buf, stdout);
 121 }
 122
 123 static int pad_spc(int llen, int cnt, const char *fmt, ...)
 124 {
 125         va_list args;
 126         int ret;
 127
 128         putcharn(' ', cnt - llen);
 129
 130         va_start(args, fmt);
 131         ret = vfprintf(stdout, fmt, args);
 132         va_end(args);
 133         return ret < 0 ? ret : ret + cnt - llen;
 134 }
 135
 136 /* The tests below are intended to be used by the macroes, which evaluate
 137  * expression <expr>, print the status to stdout, and update the "ret"
 138  * variable to count failures. The functions themselves return the number
 139  * of failures, thus either 0 or 1.
 140  */
 141
 142 #define EXPECT_ZR(cond, expr)                           \
 143         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_zr(expr, llen); } while (0)
 144
 145 static int expect_zr(int expr, int llen)
 146 {
 147         int ret = !(expr == 0);
 148
 149         llen += printf(" = %d ", expr);
 150         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 151         return ret;
 152 }
 153
 154
 155 #define EXPECT_NZ(cond, expr, val)                      \
 156         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_nz(expr, llen; } while (0)
 157
 158 static int expect_nz(int expr, int llen)
 159 {
 160         int ret = !(expr != 0);
 161
 162         llen += printf(" = %d ", expr);
 163         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 164         return ret;
 165 }
 166
 167
 168 #define EXPECT_EQ(cond, expr, val)                              \
 169         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_eq(expr, llen, val); } while (0)
 170
 171 static int expect_eq(uint64_t expr, int llen, uint64_t val)
 172 {
 173         int ret = !(expr == val);
 174
 175         llen += printf(" = %lld ", (long long)expr);
 176         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 177         return ret;
 178 }
 179
 180
 181 #define EXPECT_NE(cond, expr, val)                              \
 182         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ne(expr, llen, val); } while (0)
 183
 184 static int expect_ne(int expr, int llen, int val)
 185 {
 186         int ret = !(expr != val);
 187
 188         llen += printf(" = %d ", expr);
 189         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 190         return ret;
 191 }
 192
 193
 194 #define EXPECT_GE(cond, expr, val)                              \
 195         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ge(expr, llen, val); } while (0)
 196
 197 static int expect_ge(int expr, int llen, int val)
 198 {
 199         int ret = !(expr >= val);
 200
 201         llen += printf(" = %d ", expr);
 202         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 203         return ret;
 204 }
 205
 206
 207 #define EXPECT_GT(cond, expr, val)                              \
 208         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_gt(expr, llen, val); } while (0)
 209
 210 static int expect_gt(int expr, int llen, int val)
 211 {
 212         int ret = !(expr > val);
 213
 214         llen += printf(" = %d ", expr);
 215         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 216         return ret;
 217 }
 218
 219
 220 #define EXPECT_LE(cond, expr, val)                              \
 221         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_le(expr, llen, val); } while (0)
 222
 223 static int expect_le(int expr, int llen, int val)
 224 {
 225         int ret = !(expr <= val);
 226
 227         llen += printf(" = %d ", expr);
 228         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 229         return ret;
 230 }
 231
 232
 233 #define EXPECT_LT(cond, expr, val)                              \
 234         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_lt(expr, llen, val); } while (0)
 235
 236 static int expect_lt(int expr, int llen, int val)
 237 {
 238         int ret = !(expr < val);
 239
 240         llen += printf(" = %d ", expr);
 241         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 242         return ret;
 243 }
 244
 245
 246 #define EXPECT_SYSZR(cond, expr)                                \
 247         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syszr(expr, llen); } while (0)
 248
 249 static int expect_syszr(int expr, int llen)
 250 {
 251         int ret = 0;
 252
 253         if (expr) {
 254                 ret = 1;
 255                 llen += printf(" = %d %s ", expr, errorname(errno));
 256                 llen += pad_spc(llen, 64, "[FAIL]\n");
 257         } else {
 258                 llen += printf(" = %d ", expr);
 259                 llen += pad_spc(llen, 64, " [OK]\n");
 260         }
 261         return ret;
 262 }
 263
 264
 265 #define EXPECT_SYSEQ(cond, expr, val)                           \
 266         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syseq(expr, llen, val); } while (0)
 267
 268 static int expect_syseq(int expr, int llen, int val)
 269 {
 270         int ret = 0;
 271
 272         if (expr != val) {
 273                 ret = 1;
 274                 llen += printf(" = %d %s ", expr, errorname(errno));
 275                 llen += pad_spc(llen, 64, "[FAIL]\n");
 276         } else {
 277                 llen += printf(" = %d ", expr);
 278                 llen += pad_spc(llen, 64, " [OK]\n");
 279         }
 280         return ret;
 281 }
 282
 283
 284 #define EXPECT_SYSNE(cond, expr, val)                           \
 285         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_sysne(expr, llen, val); } while (0)
 286
 287 static int expect_sysne(int expr, int llen, int val)
 288 {
 289         int ret = 0;
 290
 291         if (expr == val) {
 292                 ret = 1;
 293                 llen += printf(" = %d %s ", expr, errorname(errno));
 294                 llen += pad_spc(llen, 64, "[FAIL]\n");
 295         } else {
 296                 llen += printf(" = %d ", expr);
 297                 llen += pad_spc(llen, 64, " [OK]\n");
 298         }
 299         return ret;
 300 }
 301
 302
 303 #define EXPECT_SYSER2(cond, expr, expret, experr1, experr2)             \
 304         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_syserr2(expr, expret, experr1, experr2, llen); } while (0)
 305
 306 #define EXPECT_SYSER(cond, expr, expret, experr)                        \
 307         EXPECT_SYSER2(cond, expr, expret, experr, 0)
 308
 309 static int expect_syserr2(int expr, int expret, int experr1, int experr2, int llen)
 310 {
 311         int ret = 0;
 312         int _errno = errno;
 313
 314         llen += printf(" = %d %s ", expr, errorname(_errno));
 315         if (expr != expret || (_errno != experr1 && _errno != experr2)) {
 316                 ret = 1;
 317                 if (experr2 == 0)
 318                         llen += printf(" != (%d %s) ", expret, errorname(experr1));
 319                 else
 320                         llen += printf(" != (%d %s %s) ", expret, errorname(experr1), errorname(experr2));
 321                 llen += pad_spc(llen, 64, "[FAIL]\n");
 322         } else {
 323                 llen += pad_spc(llen, 64, " [OK]\n");
 324         }
 325         return ret;
 326 }
 327
 328
 329 #define EXPECT_PTRZR(cond, expr)                                \
 330         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ptrzr(expr, llen); } while (0)
 331
 332 static int expect_ptrzr(const void *expr, int llen)
 333 {
 334         int ret = 0;
 335
 336         llen += printf(" = <%p> ", expr);
 337         if (expr) {
 338                 ret = 1;
 339                 llen += pad_spc(llen, 64, "[FAIL]\n");
 340         } else {
 341                 llen += pad_spc(llen, 64, " [OK]\n");
 342         }
 343         return ret;
 344 }
 345
 346
 347 #define EXPECT_PTRNZ(cond, expr)                                \
 348         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_ptrnz(expr, llen); } while (0)
 349
 350 static int expect_ptrnz(const void *expr, int llen)
 351 {
 352         int ret = 0;
 353
 354         llen += printf(" = <%p> ", expr);
 355         if (!expr) {
 356                 ret = 1;
 357                 llen += pad_spc(llen, 64, "[FAIL]\n");
 358         } else {
 359                 llen += pad_spc(llen, 64, " [OK]\n");
 360         }
 361         return ret;
 362 }
 363
 364
 365 #define EXPECT_STRZR(cond, expr)                                \
 366         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strzr(expr, llen); } while (0)
 367
 368 static int expect_strzr(const char *expr, int llen)
 369 {
 370         int ret = 0;
 371
 372         llen += printf(" = <%s> ", expr);
 373         if (expr) {
 374                 ret = 1;
 375                 llen += pad_spc(llen, 64, "[FAIL]\n");
 376         } else {
 377                 llen += pad_spc(llen, 64, " [OK]\n");
 378         }
 379         return ret;
 380 }
 381
 382
 383 #define EXPECT_STRNZ(cond, expr)                                \
 384         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strnz(expr, llen); } while (0)
 385
 386 static int expect_strnz(const char *expr, int llen)
 387 {
 388         int ret = 0;
 389
 390         llen += printf(" = <%s> ", expr);
 391         if (!expr) {
 392                 ret = 1;
 393                 llen += pad_spc(llen, 64, "[FAIL]\n");
 394         } else {
 395                 llen += pad_spc(llen, 64, " [OK]\n");
 396         }
 397         return ret;
 398 }
 399
 400
 401 #define EXPECT_STREQ(cond, expr, cmp)                           \
 402         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_streq(expr, llen, cmp); } while (0)
 403
 404 static int expect_streq(const char *expr, int llen, const char *cmp)
 405 {
 406         int ret = 0;
 407
 408         llen += printf(" = <%s> ", expr);
 409         if (strcmp(expr, cmp) != 0) {
 410                 ret = 1;
 411                 llen += pad_spc(llen, 64, "[FAIL]\n");
 412         } else {
 413                 llen += pad_spc(llen, 64, " [OK]\n");
 414         }
 415         return ret;
 416 }
 417
 418
 419 #define EXPECT_STRNE(cond, expr, cmp)                           \
 420         do { if (!cond) pad_spc(llen, 64, "[SKIPPED]\n"); else ret += expect_strne(expr, llen, cmp); } while (0)
 421
 422 static int expect_strne(const char *expr, int llen, const char *cmp)
 423 {
 424         int ret = 0;
 425
 426         llen += printf(" = <%s> ", expr);
 427         if (strcmp(expr, cmp) == 0) {
 428                 ret = 1;
 429                 llen += pad_spc(llen, 64, "[FAIL]\n");
 430         } else {
 431                 llen += pad_spc(llen, 64, " [OK]\n");
 432         }
 433         return ret;
 434 }
 435
 436
 437 /* declare tests based on line numbers. There must be exactly one test per line. */
 438 #define CASE_TEST(name) \
 439         case __LINE__: llen += printf("%d %s", test, #name);
 440
 441
 442 /* used by some syscall tests below */
 443 int test_getdents64(const char *dir)
 444 {
 445         char buffer[4096];
 446         int fd, ret;
 447         int err;
 448
 449         ret = fd = open(dir, O_RDONLY | O_DIRECTORY, 0);
 450         if (ret < 0)
 451                 return ret;
 452
 453         ret = getdents64(fd, (void *)buffer, sizeof(buffer));
 454         err = errno;
 455         close(fd);
 456
 457         errno = err;
 458         return ret;
 459 }
 460
 461 static int test_getpagesize(void)
 462 {
 463         long x = getpagesize();
 464         int c;
 465
 466         if (x < 0)
 467                 return x;
 468
 469 #if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)
 470         /*
 471          * x86 family is always 4K page.
 472          */
 473         c = (x == 4096);
 474 #elif defined(__aarch64__)
 475         /*
 476          * Linux aarch64 supports three values of page size: 4K, 16K, and 64K
 477          * which are selected at kernel compilation time.
 478          */
 479         c = (x == 4096 || x == (16 * 1024) || x == (64 * 1024));
 480 #else
 481         /*
 482          * Assuming other architectures must have at least 4K page.
 483          */
 484         c = (x >= 4096);
 485 #endif
 486
 487         return !c;
 488 }
 489
 490 static int test_fork(void)
 491 {
 492         int status;
 493         pid_t pid;
 494
 495         /* flush the printf buffer to avoid child flush it */
 496         fflush(stdout);
 497         fflush(stderr);
 498
 499         pid = fork();
 500
 501         switch (pid) {
 502         case -1:
 503                 return 1;
 504
 505         case 0:
 506                 exit(123);
 507
 508         default:
 509                 pid = waitpid(pid, &status, 0);
 510
 511                 return pid == -1 || !WIFEXITED(status) || WEXITSTATUS(status) != 123;
 512         }
 513 }
 514
 515 static int test_stat_timestamps(void)
 516 {
 517         struct stat st;
 518
 519         if (sizeof(st.st_atim.tv_sec) != sizeof(st.st_atime))
 520                 return 1;
 521
 522         if (stat("/proc/self/", &st))
 523                 return 1;
 524
 525         if (st.st_atim.tv_sec != st.st_atime || st.st_atim.tv_nsec > 1000000000)
 526                 return 1;
 527
 528         if (st.st_mtim.tv_sec != st.st_mtime || st.st_mtim.tv_nsec > 1000000000)
 529                 return 1;
 530
 531         if (st.st_ctim.tv_sec != st.st_ctime || st.st_ctim.tv_nsec > 1000000000)
 532                 return 1;
 533
 534         return 0;
 535 }
 536
 537 /* Run syscall tests between IDs <min> and <max>.
 538  * Return 0 on success, non-zero on failure.
 539  */
 540 int run_syscall(int min, int max)
 541 {
 542         struct timeval tv;
 543         struct timezone tz;
 544         struct stat stat_buf;
 545         int euid0;
 546         int proc;
 547         int test;
 548         int tmp;
 549         int ret = 0;
 550         void *p1, *p2;
 551
 552         /* <proc> indicates whether or not /proc is mounted */
 553         proc = stat("/proc", &stat_buf) == 0;
 554
 555         /* this will be used to skip certain tests that can't be run unprivileged */
 556         euid0 = geteuid() == 0;
 557
 558         for (test = min; test >= 0 && test <= max; test++) {
 559                 int llen = 0; /* line length */
 560
 561                 /* avoid leaving empty lines below, this will insert holes into
 562                  * test numbers.
 563                  */
 564                 switch (test + __LINE__ + 1) {
 565                 CASE_TEST(getpid);            EXPECT_SYSNE(1, getpid(), -1); break;
 566                 CASE_TEST(getppid);           EXPECT_SYSNE(1, getppid(), -1); break;
 567 #ifdef NOLIBC
 568                 CASE_TEST(gettid);            EXPECT_SYSNE(1, gettid(), -1); break;
 569 #endif
 570                 CASE_TEST(getpgid_self);      EXPECT_SYSNE(1, getpgid(0), -1); break;
 571                 CASE_TEST(getpgid_bad);       EXPECT_SYSER(1, getpgid(-1), -1, ESRCH); break;
 572                 CASE_TEST(kill_0);            EXPECT_SYSZR(1, kill(getpid(), 0)); break;
 573                 CASE_TEST(kill_CONT);         EXPECT_SYSZR(1, kill(getpid(), 0)); break;
 574                 CASE_TEST(kill_BADPID);       EXPECT_SYSER(1, kill(INT_MAX, 0), -1, ESRCH); break;
 575                 CASE_TEST(sbrk);              if ((p1 = p2 = sbrk(4096)) != (void *)-1) p2 = sbrk(-4096); EXPECT_SYSZR(1, (p2 == (void *)-1) || p2 == p1); break;
 576                 CASE_TEST(brk);               EXPECT_SYSZR(1, brk(sbrk(0))); break;
 577                 CASE_TEST(chdir_root);        EXPECT_SYSZR(1, chdir("/")); break;
 578                 CASE_TEST(chdir_dot);         EXPECT_SYSZR(1, chdir(".")); break;
 579                 CASE_TEST(chdir_blah);        EXPECT_SYSER(1, chdir("/blah"), -1, ENOENT); break;
 580                 CASE_TEST(chmod_net);         EXPECT_SYSZR(proc, chmod("/proc/self/net", 0555)); break;
 581                 CASE_TEST(chmod_self);        EXPECT_SYSER(proc, chmod("/proc/self", 0555), -1, EPERM); break;
 582                 CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
 583                 CASE_TEST(chroot_root);       EXPECT_SYSZR(euid0, chroot("/")); break;
 584                 CASE_TEST(chroot_blah);       EXPECT_SYSER(1, chroot("/proc/self/blah"), -1, ENOENT); break;
 585                 CASE_TEST(chroot_exe);        EXPECT_SYSER(proc, chroot("/proc/self/exe"), -1, ENOTDIR); break;
 586                 CASE_TEST(close_m1);          EXPECT_SYSER(1, close(-1), -1, EBADF); break;
 587                 CASE_TEST(close_dup);         EXPECT_SYSZR(1, close(dup(0))); break;
 588                 CASE_TEST(dup_0);             tmp = dup(0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 589                 CASE_TEST(dup_m1);            tmp = dup(-1); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 590                 CASE_TEST(dup2_0);            tmp = dup2(0, 100);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 591                 CASE_TEST(dup2_m1);           tmp = dup2(-1, 100); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 592                 CASE_TEST(dup3_0);            tmp = dup3(0, 100, 0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 593                 CASE_TEST(dup3_m1);           tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 594                 CASE_TEST(execve_root);       EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
 595                 CASE_TEST(fork);              EXPECT_SYSZR(1, test_fork()); break;
 596                 CASE_TEST(getdents64_root);   EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
 597                 CASE_TEST(getdents64_null);   EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;
 598                 CASE_TEST(gettimeofday_tv);   EXPECT_SYSZR(1, gettimeofday(&tv, NULL)); break;
 599                 CASE_TEST(gettimeofday_tv_tz);EXPECT_SYSZR(1, gettimeofday(&tv, &tz)); break;
 600                 CASE_TEST(getpagesize);       EXPECT_SYSZR(1, test_getpagesize()); break;
 601                 CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 602                 CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 603                 CASE_TEST(link_root1);        EXPECT_SYSER(1, link("/", "/"), -1, EEXIST); break;
 604                 CASE_TEST(link_blah);         EXPECT_SYSER(1, link("/proc/self/blah", "/blah"), -1, ENOENT); break;
 605                 CASE_TEST(link_dir);          EXPECT_SYSER(euid0, link("/", "/blah"), -1, EPERM); break;
 606                 CASE_TEST(link_cross);        EXPECT_SYSER(proc, link("/proc/self/net", "/blah"), -1, EXDEV); break;
 607                 CASE_TEST(lseek_m1);          EXPECT_SYSER(1, lseek(-1, 0, SEEK_SET), -1, EBADF); break;
 608                 CASE_TEST(lseek_0);           EXPECT_SYSER(1, lseek(0, 0, SEEK_SET), -1, ESPIPE); break;
 609                 CASE_TEST(mkdir_root);        EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break;
 610                 CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
 611                 CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
 612                 CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
 613                 CASE_TEST(poll_stdout);       EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;
 614                 CASE_TEST(poll_fault);        EXPECT_SYSER(1, poll((void *)1, 1, 0), -1, EFAULT); break;
 615                 CASE_TEST(prctl);             EXPECT_SYSER(1, prctl(PR_SET_NAME, (unsigned long)NULL, 0, 0, 0), -1, EFAULT); break;
 616                 CASE_TEST(read_badf);         EXPECT_SYSER(1, read(-1, &tmp, 1), -1, EBADF); break;
 617                 CASE_TEST(sched_yield);       EXPECT_SYSZR(1, sched_yield()); break;
 618                 CASE_TEST(select_null);       EXPECT_SYSZR(1, ({ struct timeval tv = { 0 }; select(0, NULL, NULL, NULL, &tv); })); break;
 619                 CASE_TEST(select_stdout);     EXPECT_SYSNE(1, ({ fd_set fds; FD_ZERO(&fds); FD_SET(1, &fds); select(2, NULL, &fds, NULL, NULL); }), -1); break;
 620                 CASE_TEST(select_fault);      EXPECT_SYSER(1, select(1, (void *)1, NULL, NULL, 0), -1, EFAULT); break;
 621                 CASE_TEST(stat_blah);         EXPECT_SYSER(1, stat("/proc/self/blah", &stat_buf), -1, ENOENT); break;
 622                 CASE_TEST(stat_fault);        EXPECT_SYSER(1, stat(NULL, &stat_buf), -1, EFAULT); break;
 623                 CASE_TEST(stat_timestamps);   EXPECT_SYSZR(1, test_stat_timestamps()); break;
 624                 CASE_TEST(symlink_root);      EXPECT_SYSER(1, symlink("/", "/"), -1, EEXIST); break;
 625                 CASE_TEST(unlink_root);       EXPECT_SYSER(1, unlink("/"), -1, EISDIR); break;
 626                 CASE_TEST(unlink_blah);       EXPECT_SYSER(1, unlink("/proc/self/blah"), -1, ENOENT); break;
 627                 CASE_TEST(wait_child);        EXPECT_SYSER(1, wait(&tmp), -1, ECHILD); break;
 628                 CASE_TEST(waitpid_min);       EXPECT_SYSER(1, waitpid(INT_MIN, &tmp, WNOHANG), -1, ESRCH); break;
 629                 CASE_TEST(waitpid_child);     EXPECT_SYSER(1, waitpid(getpid(), &tmp, WNOHANG), -1, ECHILD); break;
 630                 CASE_TEST(write_badf);        EXPECT_SYSER(1, write(-1, &tmp, 1), -1, EBADF); break;
 631                 CASE_TEST(write_zero);        EXPECT_SYSZR(1, write(1, &tmp, 0)); break;
 632                 CASE_TEST(syscall_noargs);    EXPECT_SYSEQ(1, syscall(__NR_getpid), getpid()); break;
 633                 CASE_TEST(syscall_args);      EXPECT_SYSER(1, syscall(__NR_statx, 0, NULL, 0, 0, NULL), -1, EFAULT); break;
 634                 case __LINE__:
 635                         return ret; /* must be last */
 636                 /* note: do not set any defaults so as to permit holes above */
 637                 }
 638         }
 639         return ret;
 640 }
 641
 642 int run_stdlib(int min, int max)
 643 {
 644         int test;
 645         int tmp;
 646         int ret = 0;
 647         void *p1, *p2;
 648
 649         for (test = min; test >= 0 && test <= max; test++) {
 650                 int llen = 0; /* line length */
 651
 652                 /* avoid leaving empty lines below, this will insert holes into
 653                  * test numbers.
 654                  */
 655                 switch (test + __LINE__ + 1) {
 656                 CASE_TEST(getenv_TERM);        EXPECT_STRNZ(1, getenv("TERM")); break;
 657                 CASE_TEST(getenv_blah);        EXPECT_STRZR(1, getenv("blah")); break;
 658                 CASE_TEST(setcmp_blah_blah);   EXPECT_EQ(1, strcmp("blah", "blah"), 0); break;
 659                 CASE_TEST(setcmp_blah_blah2);  EXPECT_NE(1, strcmp("blah", "blah2"), 0); break;
 660                 CASE_TEST(setncmp_blah_blah);  EXPECT_EQ(1, strncmp("blah", "blah", 10), 0); break;
 661                 CASE_TEST(setncmp_blah_blah4); EXPECT_EQ(1, strncmp("blah", "blah4", 4), 0); break;
 662                 CASE_TEST(setncmp_blah_blah5); EXPECT_NE(1, strncmp("blah", "blah5", 5), 0); break;
 663                 CASE_TEST(setncmp_blah_blah6); EXPECT_NE(1, strncmp("blah", "blah6", 6), 0); break;
 664                 CASE_TEST(strchr_foobar_o);    EXPECT_STREQ(1, strchr("foobar", 'o'), "oobar"); break;
 665                 CASE_TEST(strchr_foobar_z);    EXPECT_STRZR(1, strchr("foobar", 'z')); break;
 666                 CASE_TEST(strrchr_foobar_o);   EXPECT_STREQ(1, strrchr("foobar", 'o'), "obar"); break;
 667                 CASE_TEST(strrchr_foobar_z);   EXPECT_STRZR(1, strrchr("foobar", 'z')); break;
 668                 CASE_TEST(memcmp_20_20);       EXPECT_EQ(1, memcmp("aaa\x20", "aaa\x20", 4), 0); break;
 669                 CASE_TEST(memcmp_20_60);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\x60", 4), 0); break;
 670                 CASE_TEST(memcmp_60_20);       EXPECT_GT(1, memcmp("aaa\x60", "aaa\x20", 4), 0); break;
 671                 CASE_TEST(memcmp_20_e0);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\xe0", 4), 0); break;
 672                 CASE_TEST(memcmp_e0_20);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x20", 4), 0); break;
 673                 CASE_TEST(memcmp_80_e0);       EXPECT_LT(1, memcmp("aaa\x80", "aaa\xe0", 4), 0); break;
 674                 CASE_TEST(memcmp_e0_80);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x80", 4), 0); break;
 675                 CASE_TEST(limit_int8_max);          EXPECT_EQ(1, INT8_MAX,         (int8_t)          0x7f); break;
 676                 CASE_TEST(limit_int8_min);          EXPECT_EQ(1, INT8_MIN,         (int8_t)          0x80); break;
 677                 CASE_TEST(limit_uint8_max);         EXPECT_EQ(1, UINT8_MAX,        (uint8_t)         0xff); break;
 678                 CASE_TEST(limit_int16_max);         EXPECT_EQ(1, INT16_MAX,        (int16_t)         0x7fff); break;
 679                 CASE_TEST(limit_int16_min);         EXPECT_EQ(1, INT16_MIN,        (int16_t)         0x8000); break;
 680                 CASE_TEST(limit_uint16_max);        EXPECT_EQ(1, UINT16_MAX,       (uint16_t)        0xffff); break;
 681                 CASE_TEST(limit_int32_max);         EXPECT_EQ(1, INT32_MAX,        (int32_t)         0x7fffffff); break;
 682                 CASE_TEST(limit_int32_min);         EXPECT_EQ(1, INT32_MIN,        (int32_t)         0x80000000); break;
 683                 CASE_TEST(limit_uint32_max);        EXPECT_EQ(1, UINT32_MAX,       (uint32_t)        0xffffffff); break;
 684                 CASE_TEST(limit_int64_max);         EXPECT_EQ(1, INT64_MAX,        (int64_t)         0x7fffffffffffffff); break;
 685                 CASE_TEST(limit_int64_min);         EXPECT_EQ(1, INT64_MIN,        (int64_t)         0x8000000000000000); break;
 686                 CASE_TEST(limit_uint64_max);        EXPECT_EQ(1, UINT64_MAX,       (uint64_t)        0xffffffffffffffff); break;
 687                 CASE_TEST(limit_int_least8_max);    EXPECT_EQ(1, INT_LEAST8_MAX,   (int_least8_t)    0x7f); break;
 688                 CASE_TEST(limit_int_least8_min);    EXPECT_EQ(1, INT_LEAST8_MIN,   (int_least8_t)    0x80); break;
 689                 CASE_TEST(limit_uint_least8_max);   EXPECT_EQ(1, UINT_LEAST8_MAX,  (uint_least8_t)   0xff); break;
 690                 CASE_TEST(limit_int_least16_max);   EXPECT_EQ(1, INT_LEAST16_MAX,  (int_least16_t)   0x7fff); break;
 691                 CASE_TEST(limit_int_least16_min);   EXPECT_EQ(1, INT_LEAST16_MIN,  (int_least16_t)   0x8000); break;
 692                 CASE_TEST(limit_uint_least16_max);  EXPECT_EQ(1, UINT_LEAST16_MAX, (uint_least16_t)  0xffff); break;
 693                 CASE_TEST(limit_int_least32_max);   EXPECT_EQ(1, INT_LEAST32_MAX,  (int_least32_t)   0x7fffffff); break;
 694                 CASE_TEST(limit_int_least32_min);   EXPECT_EQ(1, INT_LEAST32_MIN,  (int_least32_t)   0x80000000); break;
 695                 CASE_TEST(limit_uint_least32_max);  EXPECT_EQ(1, UINT_LEAST32_MAX, (uint_least32_t)  0xffffffffU); break;
 696                 CASE_TEST(limit_int_least64_min);   EXPECT_EQ(1, INT_LEAST64_MIN,  (int_least64_t)   0x8000000000000000LL); break;
 697                 CASE_TEST(limit_int_least64_max);   EXPECT_EQ(1, INT_LEAST64_MAX,  (int_least64_t)   0x7fffffffffffffffLL); break;
 698                 CASE_TEST(limit_uint_least64_max);  EXPECT_EQ(1, UINT_LEAST64_MAX, (uint_least64_t)  0xffffffffffffffffULL); break;
 699                 CASE_TEST(limit_int_fast8_max);     EXPECT_EQ(1, INT_FAST8_MAX,    (int_fast8_t)     0x7f); break;
 700                 CASE_TEST(limit_int_fast8_min);     EXPECT_EQ(1, INT_FAST8_MIN,    (int_fast8_t)     0x80); break;
 701                 CASE_TEST(limit_uint_fast8_max);    EXPECT_EQ(1, UINT_FAST8_MAX,   (uint_fast8_t)    0xff); break;
 702                 CASE_TEST(limit_int_fast16_min);    EXPECT_EQ(1, INT_FAST16_MIN,   (int_fast16_t)    INTPTR_MIN); break;
 703                 CASE_TEST(limit_int_fast16_max);    EXPECT_EQ(1, INT_FAST16_MAX,   (int_fast16_t)    INTPTR_MAX); break;
 704                 CASE_TEST(limit_uint_fast16_max);   EXPECT_EQ(1, UINT_FAST16_MAX,  (uint_fast16_t)   UINTPTR_MAX); break;
 705                 CASE_TEST(limit_int_fast32_min);    EXPECT_EQ(1, INT_FAST32_MIN,   (int_fast32_t)    INTPTR_MIN); break;
 706                 CASE_TEST(limit_int_fast32_max);    EXPECT_EQ(1, INT_FAST32_MAX,   (int_fast32_t)    INTPTR_MAX); break;
 707                 CASE_TEST(limit_uint_fast32_max);   EXPECT_EQ(1, UINT_FAST32_MAX,  (uint_fast32_t)   UINTPTR_MAX); break;
 708                 CASE_TEST(limit_int_fast64_min);    EXPECT_EQ(1, INT_FAST64_MIN,   (int_fast64_t)    INT64_MIN); break;
 709                 CASE_TEST(limit_int_fast64_max);    EXPECT_EQ(1, INT_FAST64_MAX,   (int_fast64_t)    INT64_MAX); break;
 710                 CASE_TEST(limit_uint_fast64_max);   EXPECT_EQ(1, UINT_FAST64_MAX,  (uint_fast64_t)   UINT64_MAX); break;
 711 #if __SIZEOF_LONG__ == 8
 712                 CASE_TEST(limit_intptr_min);        EXPECT_EQ(1, INTPTR_MIN,       (intptr_t)        0x8000000000000000LL); break;
 713                 CASE_TEST(limit_intptr_max);        EXPECT_EQ(1, INTPTR_MAX,       (intptr_t)        0x7fffffffffffffffLL); break;
 714                 CASE_TEST(limit_uintptr_max);       EXPECT_EQ(1, UINTPTR_MAX,      (uintptr_t)       0xffffffffffffffffULL); break;
 715                 CASE_TEST(limit_ptrdiff_min);       EXPECT_EQ(1, PTRDIFF_MIN,      (ptrdiff_t)       0x8000000000000000LL); break;
 716                 CASE_TEST(limit_ptrdiff_max);       EXPECT_EQ(1, PTRDIFF_MAX,      (ptrdiff_t)       0x7fffffffffffffffLL); break;
 717                 CASE_TEST(limit_size_max);          EXPECT_EQ(1, SIZE_MAX,         (size_t)          0xffffffffffffffffULL); break;
 718 #elif __SIZEOF_LONG__ == 4
 719                 CASE_TEST(limit_intptr_min);        EXPECT_EQ(1, INTPTR_MIN,       (intptr_t)        0x80000000); break;
 720                 CASE_TEST(limit_intptr_max);        EXPECT_EQ(1, INTPTR_MAX,       (intptr_t)        0x7fffffff); break;
 721                 CASE_TEST(limit_uintptr_max);       EXPECT_EQ(1, UINTPTR_MAX,      (uintptr_t)       0xffffffffU); break;
 722                 CASE_TEST(limit_ptrdiff_min);       EXPECT_EQ(1, PTRDIFF_MIN,      (ptrdiff_t)       0x80000000); break;
 723                 CASE_TEST(limit_ptrdiff_max);       EXPECT_EQ(1, PTRDIFF_MAX,      (ptrdiff_t)       0x7fffffff); break;
 724                 CASE_TEST(limit_size_max);          EXPECT_EQ(1, SIZE_MAX,         (size_t)          0xffffffffU); break;
 725 #else
 726 # warning "__SIZEOF_LONG__ is undefined"
 727 #endif /* __SIZEOF_LONG__ */
 728                 case __LINE__:
 729                         return ret; /* must be last */
 730                 /* note: do not set any defaults so as to permit holes above */
 731                 }
 732         }
 733         return ret;
 734 }
 735
 736 #define EXPECT_VFPRINTF(c, expected, fmt, ...)                          \
 737         ret += expect_vfprintf(llen, c, expected, fmt, ##__VA_ARGS__)
 738
 739 static int expect_vfprintf(int llen, size_t c, const char *expected, const char *fmt, ...)
 740 {
 741         int ret, fd, w, r;
 742         char buf[100];
 743         FILE *memfile;
 744         va_list args;
 745
 746         fd = memfd_create("vfprintf", 0);
 747         if (fd == -1) {
 748                 pad_spc(llen, 64, "[FAIL]\n");
 749                 return 1;
 750         }
 751
 752         memfile = fdopen(fd, "w+");
 753         if (!memfile) {
 754                 pad_spc(llen, 64, "[FAIL]\n");
 755                 return 1;
 756         }
 757
 758         va_start(args, fmt);
 759         w = vfprintf(memfile, fmt, args);
 760         va_end(args);
 761
 762         if (w != c) {
 763                 llen += printf(" written(%d) != %d", w, (int) c);
 764                 pad_spc(llen, 64, "[FAIL]\n");
 765                 return 1;
 766         }
 767
 768         fflush(memfile);
 769         lseek(fd, 0, SEEK_SET);
 770
 771         r = read(fd, buf, sizeof(buf) - 1);
 772         buf[r] = '\0';
 773
 774         fclose(memfile);
 775
 776         if (r != w) {
 777                 llen += printf(" written(%d) != read(%d)", w, r);
 778                 pad_spc(llen, 64, "[FAIL]\n");
 779                 return 1;
 780         }
 781
 782         llen += printf(" \"%s\" = \"%s\"", expected, buf);
 783         ret = strncmp(expected, buf, c);
 784
 785         pad_spc(llen, 64, ret ? "[FAIL]\n" : " [OK]\n");
 786         return ret;
 787 }
 788
 789 static int run_vfprintf(int min, int max)
 790 {
 791         int test;
 792         int tmp;
 793         int ret = 0;
 794         void *p1, *p2;
 795
 796         for (test = min; test >= 0 && test <= max; test++) {
 797                 int llen = 0; /* line length */
 798
 799                 /* avoid leaving empty lines below, this will insert holes into
 800                  * test numbers.
 801                  */
 802                 switch (test + __LINE__ + 1) {
 803                 CASE_TEST(empty);        EXPECT_VFPRINTF(0, "", ""); break;
 804                 CASE_TEST(simple);       EXPECT_VFPRINTF(3, "foo", "foo"); break;
 805                 CASE_TEST(string);       EXPECT_VFPRINTF(3, "foo", "%s", "foo"); break;
 806                 CASE_TEST(number);       EXPECT_VFPRINTF(4, "1234", "%d", 1234); break;
 807                 CASE_TEST(negnumber);    EXPECT_VFPRINTF(5, "-1234", "%d", -1234); break;
 808                 CASE_TEST(unsigned);     EXPECT_VFPRINTF(5, "12345", "%u", 12345); break;
 809                 CASE_TEST(char);         EXPECT_VFPRINTF(1, "c", "%c", 'c'); break;
 810                 CASE_TEST(hex);          EXPECT_VFPRINTF(1, "f", "%x", 0xf); break;
 811                 CASE_TEST(pointer);      EXPECT_VFPRINTF(3, "0x1", "%p", (void *) 0x1); break;
 812                 case __LINE__:
 813                         return ret; /* must be last */
 814                 /* note: do not set any defaults so as to permit holes above */
 815                 }
 816         }
 817         return ret;
 818 }
 819
 820 static int smash_stack(void)
 821 {
 822         char buf[100];
 823         volatile char *ptr = buf;
 824         size_t i;
 825
 826         for (i = 0; i < 200; i++)
 827                 ptr[i] = 'P';
 828
 829         return 1;
 830 }
 831
 832 static int run_protection(int min, int max)
 833 {
 834         pid_t pid;
 835         int llen = 0, status;
 836
 837         llen += printf("0 -fstackprotector ");
 838
 839 #if !defined(_NOLIBC_STACKPROTECTOR)
 840         llen += printf("not supported");
 841         pad_spc(llen, 64, "[SKIPPED]\n");
 842         return 0;
 843 #endif
 844
 845 #if defined(_NOLIBC_STACKPROTECTOR)
 846         if (!__stack_chk_guard) {
 847                 llen += printf("__stack_chk_guard not initialized");
 848                 pad_spc(llen, 64, "[FAIL]\n");
 849                 return 1;
 850         }
 851 #endif
 852
 853         pid = -1;
 854         pid = fork();
 855
 856         switch (pid) {
 857         case -1:
 858                 llen += printf("fork()");
 859                 pad_spc(llen, 64, "[FAIL]\n");
 860                 return 1;
 861
 862         case 0:
 863                 close(STDOUT_FILENO);
 864                 close(STDERR_FILENO);
 865
 866                 prctl(PR_SET_DUMPABLE, 0, 0, 0, 0);
 867                 smash_stack();
 868                 return 1;
 869
 870         default:
 871                 pid = waitpid(pid, &status, 0);
 872
 873                 if (pid == -1 || !WIFSIGNALED(status) || WTERMSIG(status) != SIGABRT) {
 874                         llen += printf("waitpid()");
 875                         pad_spc(llen, 64, "[FAIL]\n");
 876                         return 1;
 877                 }
 878                 pad_spc(llen, 64, " [OK]\n");
 879                 return 0;
 880         }
 881 }
 882
 883 /* prepare what needs to be prepared for pid 1 (stdio, /dev, /proc, etc) */
 884 int prepare(void)
 885 {
 886         struct stat stat_buf;
 887
 888         /* It's possible that /dev doesn't even exist or was not mounted, so
 889          * we'll try to create it, mount it, or create minimal entries into it.
 890          * We want at least /dev/null and /dev/console.
 891          */
 892         if (stat("/dev/.", &stat_buf) == 0 || mkdir("/dev", 0755) == 0) {
 893                 if (stat("/dev/console", &stat_buf) != 0 ||
 894                     stat("/dev/null", &stat_buf) != 0) {
 895                         /* try devtmpfs first, otherwise fall back to manual creation */
 896                         if (mount("/dev", "/dev", "devtmpfs", 0, 0) != 0) {
 897                                 mknod("/dev/console", 0600 | S_IFCHR, makedev(5, 1));
 898                                 mknod("/dev/null",    0666 | S_IFCHR, makedev(1, 3));
 899                         }
 900                 }
 901         }
 902
 903         /* If no /dev/console was found before calling init, stdio is closed so
 904          * we need to reopen it from /dev/console. If it failed above, it will
 905          * still fail here and we cannot emit a message anyway.
 906          */
 907         if (close(dup(1)) == -1) {
 908                 int fd = open("/dev/console", O_RDWR);
 909
 910                 if (fd >= 0) {
 911                         if (fd != 0)
 912                                 dup2(fd, 0);
 913                         if (fd != 1)
 914                                 dup2(fd, 1);
 915                         if (fd != 2)
 916                                 dup2(fd, 2);
 917                         if (fd > 2)
 918                                 close(fd);
 919                         puts("\nSuccessfully reopened /dev/console.");
 920                 }
 921         }
 922
 923         /* try to mount /proc if not mounted. Silently fail otherwise */
 924         if (stat("/proc/.", &stat_buf) == 0 || mkdir("/proc", 0755) == 0) {
 925                 if (stat("/proc/self", &stat_buf) != 0)
 926                         mount("/proc", "/proc", "proc", 0, 0);
 927         }
 928
 929         return 0;
 930 }
 931
 932 /* This is the definition of known test names, with their functions */
 933 static const struct test test_names[] = {
 934         /* add new tests here */
 935         { .name = "syscall",    .func = run_syscall    },
 936         { .name = "stdlib",     .func = run_stdlib     },
 937         { .name = "vfprintf",   .func = run_vfprintf   },
 938         { .name = "protection", .func = run_protection },
 939         { 0 }
 940 };
 941
 942 int main(int argc, char **argv, char **envp)
 943 {
 944         int min = 0;
 945         int max = INT_MAX;
 946         int ret = 0;
 947         int err;
 948         int idx;
 949         char *test;
 950
 951         environ = envp;
 952
 953         /* when called as init, it's possible that no console was opened, for
 954          * example if no /dev file system was provided. We'll check that fd#1
 955          * was opened, and if not we'll attempt to create and open /dev/console
 956          * and /dev/null that we'll use for later tests.
 957          */
 958         if (getpid() == 1)
 959                 prepare();
 960
 961         /* the definition of a series of tests comes from either argv[1] or the
 962          * "NOLIBC_TEST" environment variable. It's made of a comma-delimited
 963          * series of test names and optional ranges:
 964          *    syscall:5-15[:.*],stdlib:8-10
 965          */
 966         test = argv[1];
 967         if (!test)
 968                 test = getenv("NOLIBC_TEST");
 969
 970         if (test) {
 971                 char *comma, *colon, *dash, *value;
 972
 973                 do {
 974                         comma = strchr(test, ',');
 975                         if (comma)
 976                                 *(comma++) = '\0';
 977
 978                         colon = strchr(test, ':');
 979                         if (colon)
 980                                 *(colon++) = '\0';
 981
 982                         for (idx = 0; test_names[idx].name; idx++) {
 983                                 if (strcmp(test, test_names[idx].name) == 0)
 984                                         break;
 985                         }
 986
 987                         if (test_names[idx].name) {
 988                                 /* The test was named, it will be called at least
 989                                  * once. We may have an optional range at <colon>
 990                                  * here, which defaults to the full range.
 991                                  */
 992                                 do {
 993                                         min = 0; max = INT_MAX;
 994                                         value = colon;
 995                                         if (value && *value) {
 996                                                 colon = strchr(value, ':');
 997                                                 if (colon)
 998                                                         *(colon++) = '\0';
 999
1000                                                 dash = strchr(value, '-');
1001                                                 if (dash)
1002                                                         *(dash++) = '\0';
1003
1004                                                 /* support :val: :min-max: :min-: :-max: */
1005                                                 if (*value)
1006                                                         min = atoi(value);
1007                                                 if (!dash)
1008                                                         max = min;
1009                                                 else if (*dash)
1010                                                         max = atoi(dash);
1011
1012                                                 value = colon;
1013                                         }
1014
1015                                         /* now's time to call the test */
1016                                         printf("Running test '%s'\n", test_names[idx].name);
1017                                         err = test_names[idx].func(min, max);
1018                                         ret += err;
1019                                         printf("Errors during this test: %d\n\n", err);
1020                                 } while (colon && *colon);
1021                         } else
1022                                 printf("Ignoring unknown test name '%s'\n", test);
1023
1024                         test = comma;
1025                 } while (test && *test);
1026         } else {
1027                 /* no test mentioned, run everything */
1028                 for (idx = 0; test_names[idx].name; idx++) {
1029                         printf("Running test '%s'\n", test_names[idx].name);
1030                         err = test_names[idx].func(min, max);
1031                         ret += err;
1032                         printf("Errors during this test: %d\n\n", err);
1033                 }
1034         }
1035
1036         printf("Total number of errors: %d\n", ret);
1037
1038         if (getpid() == 1) {
1039                 /* we're running as init, there's no other process on the
1040                  * system, thus likely started from a VM for a quick check.
1041                  * Exiting will provoke a kernel panic that may be reported
1042                  * as an error by Qemu or the hypervisor, while stopping
1043                  * cleanly will often be reported as a success. This allows
1044                  * to use the output of this program for bisecting kernels.
1045                  */
1046                 printf("Leaving init with final status: %d\n", !!ret);
1047                 if (ret == 0)
1048                         reboot(LINUX_REBOOT_CMD_POWER_OFF);
1049 #if defined(__x86_64__)
1050                 /* QEMU started with "-device isa-debug-exit -no-reboot" will
1051                  * exit with status code 2N+1 when N is written to 0x501. We
1052                  * hard-code the syscall here as it's arch-dependent.
1053                  */
1054 #if defined(_NOLIBC_SYS_H)
1055                 else if (my_syscall3(__NR_ioperm, 0x501, 1, 1) == 0)
1056 #else
1057                 else if (ioperm(0x501, 1, 1) == 0)
1058 #endif
1059                         __asm__ volatile ("outb %%al, %%dx" :: "d"(0x501), "a"(0));
1060                 /* if it does nothing, fall back to the regular panic */
1061 #endif
1062         }
1063
1064         printf("Exiting with status %d\n", !!ret);
1065         return !!ret;
1066 }