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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #define _GNU_SOURCE
   4
   5 /* platform-specific include files coming from the compiler */
   6 #include <limits.h>
   7
   8 /* libc-specific include files
   9  * The program may be built in 3 ways:
  10  *   $(CC) -nostdlib -include /path/to/nolibc.h => NOLIBC already defined
  11  *   $(CC) -nostdlib -I/path/to/nolibc/sysroot  => _NOLIBC_* guards are present
  12  *   $(CC) with default libc                    => NOLIBC* never defined
  13  */
  14 #ifndef NOLIBC
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #ifndef _NOLIBC_STDIO_H
  19 /* standard libcs need more includes */
  20 #include <linux/reboot.h>
  21 #include <sys/io.h>
  22 #include <sys/ioctl.h>
  23 #include <sys/mount.h>
  24 #include <sys/reboot.h>
  25 #include <sys/stat.h>
  26 #include <sys/syscall.h>
  27 #include <sys/sysmacros.h>
  28 #include <sys/time.h>
  29 #include <sys/wait.h>
  30 #include <dirent.h>
  31 #include <errno.h>
  32 #include <fcntl.h>
  33 #include <poll.h>
  34 #include <sched.h>
  35 #include <signal.h>
  36 #include <stdarg.h>
  37 #include <unistd.h>
  38 #endif
  39 #endif
  40
  41 /* will be used by nolibc by getenv() */
  42 char **environ;
  43
  44 /* definition of a series of tests */
  45 struct test {
  46         const char *name;              // test name
  47         int (*func)(int min, int max); // handler
  48 };
  49
  50 #ifndef _NOLIBC_STDLIB_H
  51 char *itoa(int i)
  52 {
  53         static char buf[12];
  54         int ret;
  55
  56         ret = snprintf(buf, sizeof(buf), "%d", i);
  57         return (ret >= 0 && ret < sizeof(buf)) ? buf : "#err";
  58 }
  59 #endif
  60
  61 #define CASE_ERR(err) \
  62         case err: return #err
  63
  64 /* returns the error name (e.g. "ENOENT") for common errors, "SUCCESS" for 0,
  65  * or the decimal value for less common ones.
  66  */
  67 const char *errorname(int err)
  68 {
  69         switch (err) {
  70         case 0: return "SUCCESS";
  71         CASE_ERR(EPERM);
  72         CASE_ERR(ENOENT);
  73         CASE_ERR(ESRCH);
  74         CASE_ERR(EINTR);
  75         CASE_ERR(EIO);
  76         CASE_ERR(ENXIO);
  77         CASE_ERR(E2BIG);
  78         CASE_ERR(ENOEXEC);
  79         CASE_ERR(EBADF);
  80         CASE_ERR(ECHILD);
  81         CASE_ERR(EAGAIN);
  82         CASE_ERR(ENOMEM);
  83         CASE_ERR(EACCES);
  84         CASE_ERR(EFAULT);
  85         CASE_ERR(ENOTBLK);
  86         CASE_ERR(EBUSY);
  87         CASE_ERR(EEXIST);
  88         CASE_ERR(EXDEV);
  89         CASE_ERR(ENODEV);
  90         CASE_ERR(ENOTDIR);
  91         CASE_ERR(EISDIR);
  92         CASE_ERR(EINVAL);
  93         CASE_ERR(ENFILE);
  94         CASE_ERR(EMFILE);
  95         CASE_ERR(ENOTTY);
  96         CASE_ERR(ETXTBSY);
  97         CASE_ERR(EFBIG);
  98         CASE_ERR(ENOSPC);
  99         CASE_ERR(ESPIPE);
 100         CASE_ERR(EROFS);
 101         CASE_ERR(EMLINK);
 102         CASE_ERR(EPIPE);
 103         CASE_ERR(EDOM);
 104         CASE_ERR(ERANGE);
 105         CASE_ERR(ENOSYS);
 106         default:
 107                 return itoa(err);
 108         }
 109 }
 110
 111 static int pad_spc(int llen, int cnt, const char *fmt, ...)
 112 {
 113         va_list args;
 114         int len;
 115         int ret;
 116
 117         for (len = 0; len < cnt - llen; len++)
 118                 putchar(' ');
 119
 120         va_start(args, fmt);
 121         ret = vfprintf(stdout, fmt, args);
 122         va_end(args);
 123         return ret < 0 ? ret : ret + len;
 124 }
 125
 126 /* The tests below are intended to be used by the macroes, which evaluate
 127  * expression <expr>, print the status to stdout, and update the "ret"
 128  * variable to count failures. The functions themselves return the number
 129  * of failures, thus either 0 or 1.
 130  */
 131
 132 #define EXPECT_ZR(cond, expr)                           \
 133         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_zr(expr, llen); } while (0)
 134
 135 static int expect_zr(int expr, int llen)
 136 {
 137         int ret = !(expr == 0);
 138
 139         llen += printf(" = %d ", expr);
 140         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 141         return ret;
 142 }
 143
 144
 145 #define EXPECT_NZ(cond, expr, val)                      \
 146         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_nz(expr, llen; } while (0)
 147
 148 static int expect_nz(int expr, int llen)
 149 {
 150         int ret = !(expr != 0);
 151
 152         llen += printf(" = %d ", expr);
 153         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 154         return ret;
 155 }
 156
 157
 158 #define EXPECT_EQ(cond, expr, val)                              \
 159         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_eq(expr, llen, val); } while (0)
 160
 161 static int expect_eq(int expr, int llen, int val)
 162 {
 163         int ret = !(expr == val);
 164
 165         llen += printf(" = %d ", expr);
 166         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 167         return ret;
 168 }
 169
 170
 171 #define EXPECT_NE(cond, expr, val)                              \
 172         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ne(expr, llen, val); } while (0)
 173
 174 static int expect_ne(int expr, int llen, int val)
 175 {
 176         int ret = !(expr != val);
 177
 178         llen += printf(" = %d ", expr);
 179         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 180         return ret;
 181 }
 182
 183
 184 #define EXPECT_GE(cond, expr, val)                              \
 185         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ge(expr, llen, val); } while (0)
 186
 187 static int expect_ge(int expr, int llen, int val)
 188 {
 189         int ret = !(expr >= val);
 190
 191         llen += printf(" = %d ", expr);
 192         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 193         return ret;
 194 }
 195
 196
 197 #define EXPECT_GT(cond, expr, val)                              \
 198         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_gt(expr, llen, val); } while (0)
 199
 200 static int expect_gt(int expr, int llen, int val)
 201 {
 202         int ret = !(expr > val);
 203
 204         llen += printf(" = %d ", expr);
 205         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 206         return ret;
 207 }
 208
 209
 210 #define EXPECT_LE(cond, expr, val)                              \
 211         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_le(expr, llen, val); } while (0)
 212
 213 static int expect_le(int expr, int llen, int val)
 214 {
 215         int ret = !(expr <= val);
 216
 217         llen += printf(" = %d ", expr);
 218         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 219         return ret;
 220 }
 221
 222
 223 #define EXPECT_LT(cond, expr, val)                              \
 224         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_lt(expr, llen, val); } while (0)
 225
 226 static int expect_lt(int expr, int llen, int val)
 227 {
 228         int ret = !(expr < val);
 229
 230         llen += printf(" = %d ", expr);
 231         pad_spc(llen, 40, ret ? "[FAIL]\n" : " [OK]\n");
 232         return ret;
 233 }
 234
 235
 236 #define EXPECT_SYSZR(cond, expr)                                \
 237         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syszr(expr, llen); } while (0)
 238
 239 static int expect_syszr(int expr, int llen)
 240 {
 241         int ret = 0;
 242
 243         if (expr) {
 244                 ret = 1;
 245                 llen += printf(" = %d %s ", expr, errorname(errno));
 246                 llen += pad_spc(llen, 40, "[FAIL]\n");
 247         } else {
 248                 llen += printf(" = %d ", expr);
 249                 llen += pad_spc(llen, 40, " [OK]\n");
 250         }
 251         return ret;
 252 }
 253
 254
 255 #define EXPECT_SYSEQ(cond, expr, val)                           \
 256         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syseq(expr, llen, val); } while (0)
 257
 258 static int expect_syseq(int expr, int llen, int val)
 259 {
 260         int ret = 0;
 261
 262         if (expr != val) {
 263                 ret = 1;
 264                 llen += printf(" = %d %s ", expr, errorname(errno));
 265                 llen += pad_spc(llen, 40, "[FAIL]\n");
 266         } else {
 267                 llen += printf(" = %d ", expr);
 268                 llen += pad_spc(llen, 40, " [OK]\n");
 269         }
 270         return ret;
 271 }
 272
 273
 274 #define EXPECT_SYSNE(cond, expr, val)                           \
 275         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_sysne(expr, llen, val); } while (0)
 276
 277 static int expect_sysne(int expr, int llen, int val)
 278 {
 279         int ret = 0;
 280
 281         if (expr == val) {
 282                 ret = 1;
 283                 llen += printf(" = %d %s ", expr, errorname(errno));
 284                 llen += pad_spc(llen, 40, "[FAIL]\n");
 285         } else {
 286                 llen += printf(" = %d ", expr);
 287                 llen += pad_spc(llen, 40, " [OK]\n");
 288         }
 289         return ret;
 290 }
 291
 292
 293 #define EXPECT_SYSER(cond, expr, expret, experr)                        \
 294         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_syserr(expr, expret, experr, llen); } while (0)
 295
 296 static int expect_syserr(int expr, int expret, int experr, int llen)
 297 {
 298         int ret = 0;
 299         int _errno = errno;
 300
 301         llen += printf(" = %d %s ", expr, errorname(_errno));
 302         if (expr != expret || _errno != experr) {
 303                 ret = 1;
 304                 llen += printf(" != (%d %s) ", expret, errorname(experr));
 305                 llen += pad_spc(llen, 40, "[FAIL]\n");
 306         } else {
 307                 llen += pad_spc(llen, 40, " [OK]\n");
 308         }
 309         return ret;
 310 }
 311
 312
 313 #define EXPECT_PTRZR(cond, expr)                                \
 314         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ptrzr(expr, llen); } while (0)
 315
 316 static int expect_ptrzr(const void *expr, int llen)
 317 {
 318         int ret = 0;
 319
 320         llen += printf(" = <%p> ", expr);
 321         if (expr) {
 322                 ret = 1;
 323                 llen += pad_spc(llen, 40, "[FAIL]\n");
 324         } else {
 325                 llen += pad_spc(llen, 40, " [OK]\n");
 326         }
 327         return ret;
 328 }
 329
 330
 331 #define EXPECT_PTRNZ(cond, expr)                                \
 332         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_ptrnz(expr, llen); } while (0)
 333
 334 static int expect_ptrnz(const void *expr, int llen)
 335 {
 336         int ret = 0;
 337
 338         llen += printf(" = <%p> ", expr);
 339         if (!expr) {
 340                 ret = 1;
 341                 llen += pad_spc(llen, 40, "[FAIL]\n");
 342         } else {
 343                 llen += pad_spc(llen, 40, " [OK]\n");
 344         }
 345         return ret;
 346 }
 347
 348
 349 #define EXPECT_STRZR(cond, expr)                                \
 350         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strzr(expr, llen); } while (0)
 351
 352 static int expect_strzr(const char *expr, int llen)
 353 {
 354         int ret = 0;
 355
 356         llen += printf(" = <%s> ", expr);
 357         if (expr) {
 358                 ret = 1;
 359                 llen += pad_spc(llen, 40, "[FAIL]\n");
 360         } else {
 361                 llen += pad_spc(llen, 40, " [OK]\n");
 362         }
 363         return ret;
 364 }
 365
 366
 367 #define EXPECT_STRNZ(cond, expr)                                \
 368         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strnz(expr, llen); } while (0)
 369
 370 static int expect_strnz(const char *expr, int llen)
 371 {
 372         int ret = 0;
 373
 374         llen += printf(" = <%s> ", expr);
 375         if (!expr) {
 376                 ret = 1;
 377                 llen += pad_spc(llen, 40, "[FAIL]\n");
 378         } else {
 379                 llen += pad_spc(llen, 40, " [OK]\n");
 380         }
 381         return ret;
 382 }
 383
 384
 385 #define EXPECT_STREQ(cond, expr, cmp)                           \
 386         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_streq(expr, llen, cmp); } while (0)
 387
 388 static int expect_streq(const char *expr, int llen, const char *cmp)
 389 {
 390         int ret = 0;
 391
 392         llen += printf(" = <%s> ", expr);
 393         if (strcmp(expr, cmp) != 0) {
 394                 ret = 1;
 395                 llen += pad_spc(llen, 40, "[FAIL]\n");
 396         } else {
 397                 llen += pad_spc(llen, 40, " [OK]\n");
 398         }
 399         return ret;
 400 }
 401
 402
 403 #define EXPECT_STRNE(cond, expr, cmp)                           \
 404         do { if (!cond) pad_spc(llen, 40, "[SKIPPED]\n"); else ret += expect_strne(expr, llen, cmp); } while (0)
 405
 406 static int expect_strne(const char *expr, int llen, const char *cmp)
 407 {
 408         int ret = 0;
 409
 410         llen += printf(" = <%s> ", expr);
 411         if (strcmp(expr, cmp) == 0) {
 412                 ret = 1;
 413                 llen += pad_spc(llen, 40, "[FAIL]\n");
 414         } else {
 415                 llen += pad_spc(llen, 40, " [OK]\n");
 416         }
 417         return ret;
 418 }
 419
 420
 421 /* declare tests based on line numbers. There must be exactly one test per line. */
 422 #define CASE_TEST(name) \
 423         case __LINE__: llen += printf("%d %s", test, #name);
 424
 425
 426 /* used by some syscall tests below */
 427 int test_getdents64(const char *dir)
 428 {
 429         char buffer[4096];
 430         int fd, ret;
 431         int err;
 432
 433         ret = fd = open(dir, O_RDONLY | O_DIRECTORY, 0);
 434         if (ret < 0)
 435                 return ret;
 436
 437         ret = getdents64(fd, (void *)buffer, sizeof(buffer));
 438         err = errno;
 439         close(fd);
 440
 441         errno = err;
 442         return ret;
 443 }
 444
 445 /* Run syscall tests between IDs <min> and <max>.
 446  * Return 0 on success, non-zero on failure.
 447  */
 448 int run_syscall(int min, int max)
 449 {
 450         struct stat stat_buf;
 451         int proc;
 452         int test;
 453         int tmp;
 454         int ret = 0;
 455         void *p1, *p2;
 456
 457         /* <proc> indicates whether or not /proc is mounted */
 458         proc = stat("/proc", &stat_buf) == 0;
 459
 460         for (test = min; test >= 0 && test <= max; test++) {
 461                 int llen = 0; // line length
 462
 463                 /* avoid leaving empty lines below, this will insert holes into
 464                  * test numbers.
 465                  */
 466                 switch (test + __LINE__ + 1) {
 467                 CASE_TEST(getpid);            EXPECT_SYSNE(1, getpid(), -1); break;
 468                 CASE_TEST(getppid);           EXPECT_SYSNE(1, getppid(), -1); break;
 469 #ifdef NOLIBC
 470                 CASE_TEST(gettid);            EXPECT_SYSNE(1, gettid(), -1); break;
 471 #endif
 472                 CASE_TEST(getpgid_self);      EXPECT_SYSNE(1, getpgid(0), -1); break;
 473                 CASE_TEST(getpgid_bad);       EXPECT_SYSER(1, getpgid(-1), -1, ESRCH); break;
 474                 CASE_TEST(kill_0);            EXPECT_SYSZR(1, kill(getpid(), 0)); break;
 475                 CASE_TEST(kill_CONT);         EXPECT_SYSZR(1, kill(getpid(), 0)); break;
 476                 CASE_TEST(kill_BADPID);       EXPECT_SYSER(1, kill(INT_MAX, 0), -1, ESRCH); break;
 477                 CASE_TEST(sbrk);              if ((p1 = p2 = sbrk(4096)) != (void *)-1) p2 = sbrk(-4096); EXPECT_SYSZR(1, (p2 == (void *)-1) || p2 == p1); break;
 478                 CASE_TEST(brk);               EXPECT_SYSZR(1, brk(sbrk(0))); break;
 479                 CASE_TEST(chdir_root);        EXPECT_SYSZR(1, chdir("/")); break;
 480                 CASE_TEST(chdir_dot);         EXPECT_SYSZR(1, chdir(".")); break;
 481                 CASE_TEST(chdir_blah);        EXPECT_SYSER(1, chdir("/blah"), -1, ENOENT); break;
 482                 CASE_TEST(chmod_net);         EXPECT_SYSZR(proc, chmod("/proc/self/net", 0555)); break;
 483                 CASE_TEST(chmod_self);        EXPECT_SYSER(proc, chmod("/proc/self", 0555), -1, EPERM); break;
 484                 CASE_TEST(chown_self);        EXPECT_SYSER(proc, chown("/proc/self", 0, 0), -1, EPERM); break;
 485                 CASE_TEST(chroot_root);       EXPECT_SYSZR(1, chroot("/")); break;
 486                 CASE_TEST(chroot_blah);       EXPECT_SYSER(1, chroot("/proc/self/blah"), -1, ENOENT); break;
 487                 CASE_TEST(chroot_exe);        EXPECT_SYSER(proc, chroot("/proc/self/exe"), -1, ENOTDIR); break;
 488                 CASE_TEST(close_m1);          EXPECT_SYSER(1, close(-1), -1, EBADF); break;
 489                 CASE_TEST(close_dup);         EXPECT_SYSZR(1, close(dup(0))); break;
 490                 CASE_TEST(dup_0);             tmp = dup(0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 491                 CASE_TEST(dup_m1);            tmp = dup(-1); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 492                 CASE_TEST(dup2_0);            tmp = dup2(0, 100);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 493                 CASE_TEST(dup2_m1);           tmp = dup2(-1, 100); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 494                 CASE_TEST(dup3_0);            tmp = dup3(0, 100, 0);  EXPECT_SYSNE(1, tmp, -1); close(tmp); break;
 495                 CASE_TEST(dup3_m1);           tmp = dup3(-1, 100, 0); EXPECT_SYSER(1, tmp, -1, EBADF); if (tmp != -1) close(tmp); break;
 496                 CASE_TEST(execve_root);       EXPECT_SYSER(1, execve("/", (char*[]){ [0] = "/", [1] = NULL }, NULL), -1, EACCES); break;
 497                 CASE_TEST(getdents64_root);   EXPECT_SYSNE(1, test_getdents64("/"), -1); break;
 498                 CASE_TEST(getdents64_null);   EXPECT_SYSER(1, test_getdents64("/dev/null"), -1, ENOTDIR); break;
 499                 CASE_TEST(gettimeofday_null); EXPECT_SYSZR(1, gettimeofday(NULL, NULL)); break;
 500 #ifdef NOLIBC
 501                 CASE_TEST(gettimeofday_bad1); EXPECT_SYSER(1, gettimeofday((void *)1, NULL), -1, EFAULT); break;
 502                 CASE_TEST(gettimeofday_bad2); EXPECT_SYSER(1, gettimeofday(NULL, (void *)1), -1, EFAULT); break;
 503                 CASE_TEST(gettimeofday_bad2); EXPECT_SYSER(1, gettimeofday(NULL, (void *)1), -1, EFAULT); break;
 504 #endif
 505                 CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 506                 CASE_TEST(ioctl_tiocinq);     EXPECT_SYSZR(1, ioctl(0, TIOCINQ, &tmp)); break;
 507                 CASE_TEST(link_root1);        EXPECT_SYSER(1, link("/", "/"), -1, EEXIST); break;
 508                 CASE_TEST(link_blah);         EXPECT_SYSER(1, link("/proc/self/blah", "/blah"), -1, ENOENT); break;
 509                 CASE_TEST(link_dir);          EXPECT_SYSER(1, link("/", "/blah"), -1, EPERM); break;
 510                 CASE_TEST(link_cross);        EXPECT_SYSER(proc, link("/proc/self/net", "/blah"), -1, EXDEV); break;
 511                 CASE_TEST(lseek_m1);          EXPECT_SYSER(1, lseek(-1, 0, SEEK_SET), -1, EBADF); break;
 512                 CASE_TEST(lseek_0);           EXPECT_SYSER(1, lseek(0, 0, SEEK_SET), -1, ESPIPE); break;
 513                 CASE_TEST(mkdir_root);        EXPECT_SYSER(1, mkdir("/", 0755), -1, EEXIST); break;
 514                 CASE_TEST(open_tty);          EXPECT_SYSNE(1, tmp = open("/dev/null", 0), -1); if (tmp != -1) close(tmp); break;
 515                 CASE_TEST(open_blah);         EXPECT_SYSER(1, tmp = open("/proc/self/blah", 0), -1, ENOENT); if (tmp != -1) close(tmp); break;
 516                 CASE_TEST(poll_null);         EXPECT_SYSZR(1, poll(NULL, 0, 0)); break;
 517                 CASE_TEST(poll_stdout);       EXPECT_SYSNE(1, ({ struct pollfd fds = { 1, POLLOUT, 0}; poll(&fds, 1, 0); }), -1); break;
 518                 CASE_TEST(poll_fault);        EXPECT_SYSER(1, poll((void *)1, 1, 0), -1, EFAULT); break;
 519                 CASE_TEST(read_badf);         EXPECT_SYSER(1, read(-1, &tmp, 1), -1, EBADF); break;
 520                 CASE_TEST(sched_yield);       EXPECT_SYSZR(1, sched_yield()); break;
 521                 CASE_TEST(select_null);       EXPECT_SYSZR(1, ({ struct timeval tv = { 0 }; select(0, NULL, NULL, NULL, &tv); })); break;
 522                 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;
 523                 CASE_TEST(select_fault);      EXPECT_SYSER(1, select(1, (void *)1, NULL, NULL, 0), -1, EFAULT); break;
 524                 CASE_TEST(stat_blah);         EXPECT_SYSER(1, stat("/proc/self/blah", &stat_buf), -1, ENOENT); break;
 525                 CASE_TEST(stat_fault);        EXPECT_SYSER(1, stat(NULL, &stat_buf), -1, EFAULT); break;
 526                 CASE_TEST(symlink_root);      EXPECT_SYSER(1, symlink("/", "/"), -1, EEXIST); break;
 527                 CASE_TEST(unlink_root);       EXPECT_SYSER(1, unlink("/"), -1, EISDIR); break;
 528                 CASE_TEST(unlink_blah);       EXPECT_SYSER(1, unlink("/proc/self/blah"), -1, ENOENT); break;
 529                 CASE_TEST(wait_child);        EXPECT_SYSER(1, wait(&tmp), -1, ECHILD); break;
 530                 CASE_TEST(waitpid_min);       EXPECT_SYSER(1, waitpid(INT_MIN, &tmp, WNOHANG), -1, ESRCH); break;
 531                 CASE_TEST(waitpid_child);     EXPECT_SYSER(1, waitpid(getpid(), &tmp, WNOHANG), -1, ECHILD); break;
 532                 CASE_TEST(write_badf);        EXPECT_SYSER(1, write(-1, &tmp, 1), -1, EBADF); break;
 533                 CASE_TEST(write_zero);        EXPECT_SYSZR(1, write(1, &tmp, 0)); break;
 534                 case __LINE__:
 535                         return ret; /* must be last */
 536                 /* note: do not set any defaults so as to permit holes above */
 537                 }
 538         }
 539         return ret;
 540 }
 541
 542 int run_stdlib(int min, int max)
 543 {
 544         int test;
 545         int tmp;
 546         int ret = 0;
 547         void *p1, *p2;
 548
 549         for (test = min; test >= 0 && test <= max; test++) {
 550                 int llen = 0; // line length
 551
 552                 /* avoid leaving empty lines below, this will insert holes into
 553                  * test numbers.
 554                  */
 555                 switch (test + __LINE__ + 1) {
 556                 CASE_TEST(getenv_TERM);        EXPECT_STRNZ(1, getenv("TERM")); break;
 557                 CASE_TEST(getenv_blah);        EXPECT_STRZR(1, getenv("blah")); break;
 558                 CASE_TEST(setcmp_blah_blah);   EXPECT_EQ(1, strcmp("blah", "blah"), 0); break;
 559                 CASE_TEST(setcmp_blah_blah2);  EXPECT_NE(1, strcmp("blah", "blah2"), 0); break;
 560                 CASE_TEST(setncmp_blah_blah);  EXPECT_EQ(1, strncmp("blah", "blah", 10), 0); break;
 561                 CASE_TEST(setncmp_blah_blah4); EXPECT_EQ(1, strncmp("blah", "blah4", 4), 0); break;
 562                 CASE_TEST(setncmp_blah_blah5); EXPECT_NE(1, strncmp("blah", "blah5", 5), 0); break;
 563                 CASE_TEST(setncmp_blah_blah6); EXPECT_NE(1, strncmp("blah", "blah6", 6), 0); break;
 564                 CASE_TEST(strchr_foobar_o);    EXPECT_STREQ(1, strchr("foobar", 'o'), "oobar"); break;
 565                 CASE_TEST(strchr_foobar_z);    EXPECT_STRZR(1, strchr("foobar", 'z')); break;
 566                 CASE_TEST(strrchr_foobar_o);   EXPECT_STREQ(1, strrchr("foobar", 'o'), "obar"); break;
 567                 CASE_TEST(strrchr_foobar_z);   EXPECT_STRZR(1, strrchr("foobar", 'z')); break;
 568                 CASE_TEST(memcmp_20_20);       EXPECT_EQ(1, memcmp("aaa\x20", "aaa\x20", 4), 0); break;
 569                 CASE_TEST(memcmp_20_60);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\x60", 4), 0); break;
 570                 CASE_TEST(memcmp_60_20);       EXPECT_GT(1, memcmp("aaa\x60", "aaa\x20", 4), 0); break;
 571                 CASE_TEST(memcmp_20_e0);       EXPECT_LT(1, memcmp("aaa\x20", "aaa\xe0", 4), 0); break;
 572                 CASE_TEST(memcmp_e0_20);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x20", 4), 0); break;
 573                 CASE_TEST(memcmp_80_e0);       EXPECT_LT(1, memcmp("aaa\x80", "aaa\xe0", 4), 0); break;
 574                 CASE_TEST(memcmp_e0_80);       EXPECT_GT(1, memcmp("aaa\xe0", "aaa\x80", 4), 0); break;
 575                 case __LINE__:
 576                         return ret; /* must be last */
 577                 /* note: do not set any defaults so as to permit holes above */
 578                 }
 579         }
 580         return ret;
 581 }
 582
 583 /* prepare what needs to be prepared for pid 1 (stdio, /dev, /proc, etc) */
 584 int prepare(void)
 585 {
 586         struct stat stat_buf;
 587
 588         /* It's possible that /dev doesn't even exist or was not mounted, so
 589          * we'll try to create it, mount it, or create minimal entries into it.
 590          * We want at least /dev/null and /dev/console.
 591          */
 592         if (stat("/dev/.", &stat_buf) == 0 || mkdir("/dev", 0755) == 0) {
 593                 if (stat("/dev/console", &stat_buf) != 0 ||
 594                     stat("/dev/null", &stat_buf) != 0) {
 595                         /* try devtmpfs first, otherwise fall back to manual creation */
 596                         if (mount("/dev", "/dev", "devtmpfs", 0, 0) != 0) {
 597                                 mknod("/dev/console", 0600 | S_IFCHR, makedev(5, 1));
 598                                 mknod("/dev/null",    0666 | S_IFCHR, makedev(1, 3));
 599                         }
 600                 }
 601         }
 602
 603         /* If no /dev/console was found before calling init, stdio is closed so
 604          * we need to reopen it from /dev/console. If it failed above, it will
 605          * still fail here and we cannot emit a message anyway.
 606          */
 607         if (close(dup(1)) == -1) {
 608                 int fd = open("/dev/console", O_RDWR);
 609
 610                 if (fd >= 0) {
 611                         if (fd != 0)
 612                                 dup2(fd, 0);
 613                         if (fd != 1)
 614                                 dup2(fd, 1);
 615                         if (fd != 2)
 616                                 dup2(fd, 2);
 617                         if (fd > 2)
 618                                 close(fd);
 619                         puts("\nSuccessfully reopened /dev/console.");
 620                 }
 621         }
 622
 623         /* try to mount /proc if not mounted. Silently fail otherwise */
 624         if (stat("/proc/.", &stat_buf) == 0 || mkdir("/proc", 0755) == 0) {
 625                 if (stat("/proc/self", &stat_buf) != 0)
 626                         mount("/proc", "/proc", "proc", 0, 0);
 627         }
 628
 629         return 0;
 630 }
 631
 632 /* This is the definition of known test names, with their functions */
 633 static struct test test_names[] = {
 634         /* add new tests here */
 635         { .name = "syscall",   .func = run_syscall  },
 636         { .name = "stdlib",    .func = run_stdlib   },
 637         { 0 }
 638 };
 639
 640 int main(int argc, char **argv, char **envp)
 641 {
 642         int min = 0;
 643         int max = __INT_MAX__;
 644         int ret = 0;
 645         int err;
 646         int idx;
 647         char *test;
 648
 649         environ = envp;
 650
 651         /* when called as init, it's possible that no console was opened, for
 652          * example if no /dev file system was provided. We'll check that fd#1
 653          * was opened, and if not we'll attempt to create and open /dev/console
 654          * and /dev/null that we'll use for later tests.
 655          */
 656         if (getpid() == 1)
 657                 prepare();
 658
 659         /* the definition of a series of tests comes from either argv[1] or the
 660          * "NOLIBC_TEST" environment variable. It's made of a comma-delimited
 661          * series of test names and optional ranges:
 662          *    syscall:5-15[:.*],stdlib:8-10
 663          */
 664         test = argv[1];
 665         if (!test)
 666                 test = getenv("NOLIBC_TEST");
 667
 668         if (test) {
 669                 char *comma, *colon, *dash, *value;
 670
 671                 do {
 672                         comma = strchr(test, ',');
 673                         if (comma)
 674                                 *(comma++) = '\0';
 675
 676                         colon = strchr(test, ':');
 677                         if (colon)
 678                                 *(colon++) = '\0';
 679
 680                         for (idx = 0; test_names[idx].name; idx++) {
 681                                 if (strcmp(test, test_names[idx].name) == 0)
 682                                         break;
 683                         }
 684
 685                         if (test_names[idx].name) {
 686                                 /* The test was named, it will be called at least
 687                                  * once. We may have an optional range at <colon>
 688                                  * here, which defaults to the full range.
 689                                  */
 690                                 do {
 691                                         min = 0; max = __INT_MAX__;
 692                                         value = colon;
 693                                         if (value && *value) {
 694                                                 colon = strchr(value, ':');
 695                                                 if (colon)
 696                                                         *(colon++) = '\0';
 697
 698                                                 dash = strchr(value, '-');
 699                                                 if (dash)
 700                                                         *(dash++) = '\0';
 701
 702                                                 /* support :val: :min-max: :min-: :-max: */
 703                                                 if (*value)
 704                                                         min = atoi(value);
 705                                                 if (!dash)
 706                                                         max = min;
 707                                                 else if (*dash)
 708                                                         max = atoi(dash);
 709
 710                                                 value = colon;
 711                                         }
 712
 713                                         /* now's time to call the test */
 714                                         printf("Running test '%s'\n", test_names[idx].name);
 715                                         err = test_names[idx].func(min, max);
 716                                         ret += err;
 717                                         printf("Errors during this test: %d\n\n", err);
 718                                 } while (colon && *colon);
 719                         } else
 720                                 printf("Ignoring unknown test name '%s'\n", test);
 721
 722                         test = comma;
 723                 } while (test && *test);
 724         } else {
 725                 /* no test mentioned, run everything */
 726                 for (idx = 0; test_names[idx].name; idx++) {
 727                         printf("Running test '%s'\n", test_names[idx].name);
 728                         err = test_names[idx].func(min, max);
 729                         ret += err;
 730                         printf("Errors during this test: %d\n\n", err);
 731                 }
 732         }
 733
 734         printf("Total number of errors: %d\n", ret);
 735
 736         if (getpid() == 1) {
 737                 /* we're running as init, there's no other process on the
 738                  * system, thus likely started from a VM for a quick check.
 739                  * Exiting will provoke a kernel panic that may be reported
 740                  * as an error by Qemu or the hypervisor, while stopping
 741                  * cleanly will often be reported as a success. This allows
 742                  * to use the output of this program for bisecting kernels.
 743                  */
 744                 printf("Leaving init with final status: %d\n", !!ret);
 745                 if (ret == 0)
 746                         reboot(LINUX_REBOOT_CMD_POWER_OFF);
 747 #if defined(__x86_64__)
 748                 /* QEMU started with "-device isa-debug-exit -no-reboot" will
 749                  * exit with status code 2N+1 when N is written to 0x501. We
 750                  * hard-code the syscall here as it's arch-dependent.
 751                  */
 752 #if defined(_NOLIBC_SYS_H)
 753                 else if (my_syscall3(__NR_ioperm, 0x501, 1, 1) == 0)
 754 #else
 755                 else if (ioperm(0x501, 1, 1) == 0)
 756 #endif
 757                         asm volatile ("outb %%al, %%dx" :: "d"(0x501), "a"(0));
 758                 /* if it does nothing, fall back to the regular panic */
 759 #endif
 760         }
 761
 762         printf("Exiting with status %d\n", !!ret);
 763         return !!ret;
 764 }