src/test/test-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <sys/wait.h>
   6 #include <unistd.h>
   7
   8 #include "def.h"
   9 #include "fileio.h"
  10 #include "fs-util.h"
  11 #include "parse-util.h"
  12 #include "process-util.h"
  13 #include "raw-clone.h"
  14 #include "rm-rf.h"
  15 #include "string-util.h"
  16 #include "util.h"
  17
  18 static void test_align_power2(void) {
  19         unsigned long i, p2;
  20
  21         assert_se(ALIGN_POWER2(0) == 0);
  22         assert_se(ALIGN_POWER2(1) == 1);
  23         assert_se(ALIGN_POWER2(2) == 2);
  24         assert_se(ALIGN_POWER2(3) == 4);
  25         assert_se(ALIGN_POWER2(12) == 16);
  26
  27         assert_se(ALIGN_POWER2(ULONG_MAX) == 0);
  28         assert_se(ALIGN_POWER2(ULONG_MAX - 1) == 0);
  29         assert_se(ALIGN_POWER2(ULONG_MAX - 1024) == 0);
  30         assert_se(ALIGN_POWER2(ULONG_MAX / 2) == ULONG_MAX / 2 + 1);
  31         assert_se(ALIGN_POWER2(ULONG_MAX + 1) == 0);
  32
  33         for (i = 1; i < 131071; ++i) {
  34                 for (p2 = 1; p2 < i; p2 <<= 1)
  35                         /* empty */ ;
  36
  37                 assert_se(ALIGN_POWER2(i) == p2);
  38         }
  39
  40         for (i = ULONG_MAX - 1024; i < ULONG_MAX; ++i) {
  41                 for (p2 = 1; p2 && p2 < i; p2 <<= 1)
  42                         /* empty */ ;
  43
  44                 assert_se(ALIGN_POWER2(i) == p2);
  45         }
  46 }
  47
  48 static void test_max(void) {
  49         static const struct {
  50                 int a;
  51                 int b[CONST_MAX(10, 100)];
  52         } val1 = {
  53                 .a = CONST_MAX(10, 100),
  54         };
  55         int d = 0;
  56         unsigned long x = 12345;
  57         unsigned long y = 54321;
  58         const char str[] = "a_string_constant";
  59         const unsigned long long arr[] = {9999ULL, 10ULL, 0ULL, 3000ULL, 2000ULL, 1000ULL, 100ULL, 9999999ULL};
  60         void *p = (void *)str;
  61         void *q = (void *)&str[16];
  62
  63         assert_cc(sizeof(val1.b) == sizeof(int) * 100);
  64
  65         /* CONST_MAX returns (void) instead of a value if the passed arguments
  66          * are not of the same type or not constant expressions. */
  67         assert_cc(__builtin_types_compatible_p(typeof(CONST_MAX(1, 10)), int));
  68         assert_cc(__builtin_types_compatible_p(typeof(CONST_MAX(1, 1U)), void));
  69
  70         assert_se(val1.a == 100);
  71         assert_se(MAX(++d, 0) == 1);
  72         assert_se(d == 1);
  73
  74         assert_cc(MAXSIZE(char[3], uint16_t) == 3);
  75         assert_cc(MAXSIZE(char[3], uint32_t) == 4);
  76         assert_cc(MAXSIZE(char, long) == sizeof(long));
  77
  78         assert_se(MAX(-5, 5) == 5);
  79         assert_se(MAX(5, 5) == 5);
  80         assert_se(MAX(MAX(1, MAX(2, MAX(3, 4))), 5) == 5);
  81         assert_se(MAX(MAX(1, MAX(2, MAX(3, 2))), 1) == 3);
  82         assert_se(MAX(MIN(1, MIN(2, MIN(3, 4))), 5) == 5);
  83         assert_se(MAX(MAX(1, MIN(2, MIN(3, 2))), 1) == 2);
  84         assert_se(LESS_BY(8, 4) == 4);
  85         assert_se(LESS_BY(8, 8) == 0);
  86         assert_se(LESS_BY(4, 8) == 0);
  87         assert_se(LESS_BY(16, LESS_BY(8, 4)) == 12);
  88         assert_se(LESS_BY(4, LESS_BY(8, 4)) == 0);
  89         assert_se(CMP(3, 5) == -1);
  90         assert_se(CMP(5, 3) == 1);
  91         assert_se(CMP(5, 5) == 0);
  92         assert_se(CMP(x, y) == -1);
  93         assert_se(CMP(y, x) == 1);
  94         assert_se(CMP(x, x) == 0);
  95         assert_se(CMP(y, y) == 0);
  96         assert_se(CMP(UINT64_MAX, (uint64_t) 0) == 1);
  97         assert_se(CMP((uint64_t) 0, UINT64_MAX) == -1);
  98         assert_se(CMP(UINT64_MAX, UINT64_MAX) == 0);
  99         assert_se(CMP(INT64_MIN, INT64_MAX) == -1);
 100         assert_se(CMP(INT64_MAX, INT64_MIN) == 1);
 101         assert_se(CMP(INT64_MAX, INT64_MAX) == 0);
 102         assert_se(CMP(INT64_MIN, INT64_MIN) == 0);
 103         assert_se(CMP(INT64_MAX, (int64_t) 0) == 1);
 104         assert_se(CMP((int64_t) 0, INT64_MIN) == 1);
 105         assert_se(CMP(INT64_MIN, (int64_t) 0) == -1);
 106         assert_se(CMP((int64_t) 0, INT64_MAX) == -1);
 107         assert_se(CMP(&str[2], &str[7]) == -1);
 108         assert_se(CMP(&str[2], &str[2]) == 0);
 109         assert_se(CMP(&str[7], (const char *)str) == 1);
 110         assert_se(CMP(str[2], str[7]) == 1);
 111         assert_se(CMP(str[7], *str) == 1);
 112         assert_se(CMP((const unsigned long long *)arr, &arr[3]) == -1);
 113         assert_se(CMP(*arr, arr[3]) == 1);
 114         assert_se(CMP(p, q) == -1);
 115         assert_se(CMP(q, p) == 1);
 116         assert_se(CMP(p, p) == 0);
 117         assert_se(CMP(q, q) == 0);
 118         assert_se(CLAMP(-5, 0, 1) == 0);
 119         assert_se(CLAMP(5, 0, 1) == 1);
 120         assert_se(CLAMP(5, -10, 1) == 1);
 121         assert_se(CLAMP(5, -10, 10) == 5);
 122         assert_se(CLAMP(CLAMP(0, -10, 10), CLAMP(-5, 10, 20), CLAMP(100, -5, 20)) == 10);
 123 }
 124
 125 #pragma GCC diagnostic push
 126 #ifdef __clang__
 127 #  pragma GCC diagnostic ignored "-Waddress-of-packed-member"
 128 #endif
 129
 130 static void test_container_of(void) {
 131         struct mytype {
 132                 uint8_t pad1[3];
 133                 uint64_t v1;
 134                 uint8_t pad2[2];
 135                 uint32_t v2;
 136         } _packed_ myval = { };
 137
 138         assert_cc(sizeof(myval) == 17);
 139         assert_se(container_of(&myval.v1, struct mytype, v1) == &myval);
 140         assert_se(container_of(&myval.v2, struct mytype, v2) == &myval);
 141         assert_se(container_of(&container_of(&myval.v2,
 142                                              struct mytype,
 143                                              v2)->v1,
 144                                struct mytype,
 145                                v1) == &myval);
 146 }
 147
 148 #pragma GCC diagnostic pop
 149
 150 static void test_div_round_up(void) {
 151         int div;
 152
 153         /* basic tests */
 154         assert_se(DIV_ROUND_UP(0, 8) == 0);
 155         assert_se(DIV_ROUND_UP(1, 8) == 1);
 156         assert_se(DIV_ROUND_UP(8, 8) == 1);
 157         assert_se(DIV_ROUND_UP(12, 8) == 2);
 158         assert_se(DIV_ROUND_UP(16, 8) == 2);
 159
 160         /* test multiple evaluation */
 161         div = 0;
 162         assert_se(DIV_ROUND_UP(div++, 8) == 0 && div == 1);
 163         assert_se(DIV_ROUND_UP(++div, 8) == 1 && div == 2);
 164         assert_se(DIV_ROUND_UP(8, div++) == 4 && div == 3);
 165         assert_se(DIV_ROUND_UP(8, ++div) == 2 && div == 4);
 166
 167         /* overflow test with exact division */
 168         assert_se(sizeof(0U) == 4);
 169         assert_se(0xfffffffaU % 10U == 0U);
 170         assert_se(0xfffffffaU / 10U == 429496729U);
 171         assert_se(DIV_ROUND_UP(0xfffffffaU, 10U) == 429496729U);
 172         assert_se((0xfffffffaU + 10U - 1U) / 10U == 0U);
 173         assert_se(0xfffffffaU / 10U + !!(0xfffffffaU % 10U) == 429496729U);
 174
 175         /* overflow test with rounded division */
 176         assert_se(0xfffffffdU % 10U == 3U);
 177         assert_se(0xfffffffdU / 10U == 429496729U);
 178         assert_se(DIV_ROUND_UP(0xfffffffdU, 10U) == 429496730U);
 179         assert_se((0xfffffffdU + 10U - 1U) / 10U == 0U);
 180         assert_se(0xfffffffdU / 10U + !!(0xfffffffdU % 10U) == 429496730U);
 181 }
 182
 183 static void test_u64log2(void) {
 184         assert_se(u64log2(0) == 0);
 185         assert_se(u64log2(8) == 3);
 186         assert_se(u64log2(9) == 3);
 187         assert_se(u64log2(15) == 3);
 188         assert_se(u64log2(16) == 4);
 189         assert_se(u64log2(1024*1024) == 20);
 190         assert_se(u64log2(1024*1024+5) == 20);
 191 }
 192
 193 static void test_protect_errno(void) {
 194         errno = 12;
 195         {
 196                 PROTECT_ERRNO;
 197                 errno = 11;
 198         }
 199         assert_se(errno == 12);
 200 }
 201
 202 static void test_in_set(void) {
 203         assert_se(IN_SET(1, 1));
 204         assert_se(IN_SET(1, 1, 2, 3, 4));
 205         assert_se(IN_SET(2, 1, 2, 3, 4));
 206         assert_se(IN_SET(3, 1, 2, 3, 4));
 207         assert_se(IN_SET(4, 1, 2, 3, 4));
 208         assert_se(!IN_SET(0, 1));
 209         assert_se(!IN_SET(0, 1, 2, 3, 4));
 210 }
 211
 212 static void test_log2i(void) {
 213         assert_se(log2i(1) == 0);
 214         assert_se(log2i(2) == 1);
 215         assert_se(log2i(3) == 1);
 216         assert_se(log2i(4) == 2);
 217         assert_se(log2i(32) == 5);
 218         assert_se(log2i(33) == 5);
 219         assert_se(log2i(63) == 5);
 220         assert_se(log2i(INT_MAX) == sizeof(int)*8-2);
 221 }
 222
 223 static void test_raw_clone(void) {
 224         pid_t parent, pid, pid2;
 225
 226         parent = getpid();
 227         log_info("before clone: getpid()→"PID_FMT, parent);
 228         assert_se(raw_getpid() == parent);
 229
 230         pid = raw_clone(0);
 231         assert_se(pid >= 0);
 232
 233         pid2 = raw_getpid();
 234         log_info("raw_clone: "PID_FMT" getpid()→"PID_FMT" raw_getpid()→"PID_FMT,
 235                  pid, getpid(), pid2);
 236         if (pid == 0) {
 237                 assert_se(pid2 != parent);
 238                 _exit(EXIT_SUCCESS);
 239         } else {
 240                 int status;
 241
 242                 assert_se(pid2 == parent);
 243                 waitpid(pid, &status, __WCLONE);
 244                 assert_se(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
 245         }
 246
 247         errno = 0;
 248         assert_se(raw_clone(CLONE_FS|CLONE_NEWNS) == -1);
 249         assert_se(errno == EINVAL);
 250 }
 251
 252 static void test_physical_memory(void) {
 253         uint64_t p;
 254         char buf[FORMAT_BYTES_MAX];
 255
 256         p = physical_memory();
 257         assert_se(p > 0);
 258         assert_se(p < UINT64_MAX);
 259         assert_se(p % page_size() == 0);
 260
 261         log_info("Memory: %s (%" PRIu64 ")", format_bytes(buf, sizeof(buf), p), p);
 262 }
 263
 264 static void test_physical_memory_scale(void) {
 265         uint64_t p;
 266
 267         p = physical_memory();
 268
 269         assert_se(physical_memory_scale(0, 100) == 0);
 270         assert_se(physical_memory_scale(100, 100) == p);
 271
 272         log_info("Memory original: %" PRIu64, physical_memory());
 273         log_info("Memory scaled by 50%%: %" PRIu64, physical_memory_scale(50, 100));
 274         log_info("Memory divided by 2: %" PRIu64, physical_memory() / 2);
 275         log_info("Page size: %zu", page_size());
 276
 277         /* There might be an uneven number of pages, hence permit these calculations to be half a page off... */
 278         assert_se(page_size()/2 + physical_memory_scale(50, 100) - p/2 <= page_size());
 279         assert_se(physical_memory_scale(200, 100) == p*2);
 280
 281         assert_se(physical_memory_scale(0, 1) == 0);
 282         assert_se(physical_memory_scale(1, 1) == p);
 283         assert_se(physical_memory_scale(2, 1) == p*2);
 284
 285         assert_se(physical_memory_scale(0, 2) == 0);
 286
 287         assert_se(page_size()/2 + physical_memory_scale(1, 2) - p/2 <= page_size());
 288         assert_se(physical_memory_scale(2, 2) == p);
 289         assert_se(physical_memory_scale(4, 2) == p*2);
 290
 291         assert_se(physical_memory_scale(0, UINT32_MAX) == 0);
 292         assert_se(physical_memory_scale(UINT32_MAX, UINT32_MAX) == p);
 293
 294         /* overflow */
 295         assert_se(physical_memory_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
 296 }
 297
 298 static void test_system_tasks_max(void) {
 299         uint64_t t;
 300
 301         t = system_tasks_max();
 302         assert_se(t > 0);
 303         assert_se(t < UINT64_MAX);
 304
 305         log_info("Max tasks: %" PRIu64, t);
 306 }
 307
 308 static void test_system_tasks_max_scale(void) {
 309         uint64_t t;
 310
 311         t = system_tasks_max();
 312
 313         assert_se(system_tasks_max_scale(0, 100) == 0);
 314         assert_se(system_tasks_max_scale(100, 100) == t);
 315
 316         assert_se(system_tasks_max_scale(0, 1) == 0);
 317         assert_se(system_tasks_max_scale(1, 1) == t);
 318         assert_se(system_tasks_max_scale(2, 1) == 2*t);
 319
 320         assert_se(system_tasks_max_scale(0, 2) == 0);
 321         assert_se(system_tasks_max_scale(1, 2) == t/2);
 322         assert_se(system_tasks_max_scale(2, 2) == t);
 323         assert_se(system_tasks_max_scale(3, 2) == (3*t)/2);
 324         assert_se(system_tasks_max_scale(4, 2) == t*2);
 325
 326         assert_se(system_tasks_max_scale(0, UINT32_MAX) == 0);
 327         assert_se(system_tasks_max_scale((UINT32_MAX-1)/2, UINT32_MAX-1) == t/2);
 328         assert_se(system_tasks_max_scale(UINT32_MAX, UINT32_MAX) == t);
 329
 330         /* overflow */
 331
 332         assert_se(system_tasks_max_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
 333 }
 334
 335 int main(int argc, char *argv[]) {
 336         log_parse_environment();
 337         log_open();
 338
 339         test_align_power2();
 340         test_max();
 341         test_container_of();
 342         test_div_round_up();
 343         test_u64log2();
 344         test_protect_errno();
 345         test_in_set();
 346         test_log2i();
 347         test_raw_clone();
 348         test_physical_memory();
 349         test_physical_memory_scale();
 350         test_system_tasks_max();
 351         test_system_tasks_max_scale();
 352
 353         return 0;
 354 }