src/test/test-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright 2010 Lennart Poettering
   4   Copyright 2013 Thomas H.P. Andersen
   5 ***/
   6
   7 #include <errno.h>
   8 #include <string.h>
   9 #include <sys/wait.h>
  10 #include <unistd.h>
  11
  12 #include "def.h"
  13 #include "fileio.h"
  14 #include "fs-util.h"
  15 #include "parse-util.h"
  16 #include "process-util.h"
  17 #include "raw-clone.h"
  18 #include "rm-rf.h"
  19 #include "string-util.h"
  20 #include "util.h"
  21
  22 static void test_align_power2(void) {
  23         unsigned long i, p2;
  24
  25         assert_se(ALIGN_POWER2(0) == 0);
  26         assert_se(ALIGN_POWER2(1) == 1);
  27         assert_se(ALIGN_POWER2(2) == 2);
  28         assert_se(ALIGN_POWER2(3) == 4);
  29         assert_se(ALIGN_POWER2(12) == 16);
  30
  31         assert_se(ALIGN_POWER2(ULONG_MAX) == 0);
  32         assert_se(ALIGN_POWER2(ULONG_MAX - 1) == 0);
  33         assert_se(ALIGN_POWER2(ULONG_MAX - 1024) == 0);
  34         assert_se(ALIGN_POWER2(ULONG_MAX / 2) == ULONG_MAX / 2 + 1);
  35         assert_se(ALIGN_POWER2(ULONG_MAX + 1) == 0);
  36
  37         for (i = 1; i < 131071; ++i) {
  38                 for (p2 = 1; p2 < i; p2 <<= 1)
  39                         /* empty */ ;
  40
  41                 assert_se(ALIGN_POWER2(i) == p2);
  42         }
  43
  44         for (i = ULONG_MAX - 1024; i < ULONG_MAX; ++i) {
  45                 for (p2 = 1; p2 && p2 < i; p2 <<= 1)
  46                         /* empty */ ;
  47
  48                 assert_se(ALIGN_POWER2(i) == p2);
  49         }
  50 }
  51
  52 static void test_max(void) {
  53         static const struct {
  54                 int a;
  55                 int b[CONST_MAX(10, 100)];
  56         } val1 = {
  57                 .a = CONST_MAX(10, 100),
  58         };
  59         int d = 0;
  60
  61         assert_cc(sizeof(val1.b) == sizeof(int) * 100);
  62
  63         /* CONST_MAX returns (void) instead of a value if the passed arguments
  64          * are not of the same type or not constant expressions. */
  65         assert_cc(__builtin_types_compatible_p(typeof(CONST_MAX(1, 10)), int));
  66         assert_cc(__builtin_types_compatible_p(typeof(CONST_MAX(1, 1U)), void));
  67
  68         assert_se(val1.a == 100);
  69         assert_se(MAX(++d, 0) == 1);
  70         assert_se(d == 1);
  71
  72         assert_cc(MAXSIZE(char[3], uint16_t) == 3);
  73         assert_cc(MAXSIZE(char[3], uint32_t) == 4);
  74         assert_cc(MAXSIZE(char, long) == sizeof(long));
  75
  76         assert_se(MAX(-5, 5) == 5);
  77         assert_se(MAX(5, 5) == 5);
  78         assert_se(MAX(MAX(1, MAX(2, MAX(3, 4))), 5) == 5);
  79         assert_se(MAX(MAX(1, MAX(2, MAX(3, 2))), 1) == 3);
  80         assert_se(MAX(MIN(1, MIN(2, MIN(3, 4))), 5) == 5);
  81         assert_se(MAX(MAX(1, MIN(2, MIN(3, 2))), 1) == 2);
  82         assert_se(LESS_BY(8, 4) == 4);
  83         assert_se(LESS_BY(8, 8) == 0);
  84         assert_se(LESS_BY(4, 8) == 0);
  85         assert_se(LESS_BY(16, LESS_BY(8, 4)) == 12);
  86         assert_se(LESS_BY(4, LESS_BY(8, 4)) == 0);
  87         assert_se(CLAMP(-5, 0, 1) == 0);
  88         assert_se(CLAMP(5, 0, 1) == 1);
  89         assert_se(CLAMP(5, -10, 1) == 1);
  90         assert_se(CLAMP(5, -10, 10) == 5);
  91         assert_se(CLAMP(CLAMP(0, -10, 10), CLAMP(-5, 10, 20), CLAMP(100, -5, 20)) == 10);
  92 }
  93
  94 #pragma GCC diagnostic push
  95 #ifdef __clang__
  96 #  pragma GCC diagnostic ignored "-Waddress-of-packed-member"
  97 #endif
  98
  99 static void test_container_of(void) {
 100         struct mytype {
 101                 uint8_t pad1[3];
 102                 uint64_t v1;
 103                 uint8_t pad2[2];
 104                 uint32_t v2;
 105         } _packed_ myval = { };
 106
 107         assert_cc(sizeof(myval) == 17);
 108         assert_se(container_of(&myval.v1, struct mytype, v1) == &myval);
 109         assert_se(container_of(&myval.v2, struct mytype, v2) == &myval);
 110         assert_se(container_of(&container_of(&myval.v2,
 111                                              struct mytype,
 112                                              v2)->v1,
 113                                struct mytype,
 114                                v1) == &myval);
 115 }
 116
 117 #pragma GCC diagnostic pop
 118
 119 static void test_div_round_up(void) {
 120         int div;
 121
 122         /* basic tests */
 123         assert_se(DIV_ROUND_UP(0, 8) == 0);
 124         assert_se(DIV_ROUND_UP(1, 8) == 1);
 125         assert_se(DIV_ROUND_UP(8, 8) == 1);
 126         assert_se(DIV_ROUND_UP(12, 8) == 2);
 127         assert_se(DIV_ROUND_UP(16, 8) == 2);
 128
 129         /* test multiple evaluation */
 130         div = 0;
 131         assert_se(DIV_ROUND_UP(div++, 8) == 0 && div == 1);
 132         assert_se(DIV_ROUND_UP(++div, 8) == 1 && div == 2);
 133         assert_se(DIV_ROUND_UP(8, div++) == 4 && div == 3);
 134         assert_se(DIV_ROUND_UP(8, ++div) == 2 && div == 4);
 135
 136         /* overflow test with exact division */
 137         assert_se(sizeof(0U) == 4);
 138         assert_se(0xfffffffaU % 10U == 0U);
 139         assert_se(0xfffffffaU / 10U == 429496729U);
 140         assert_se(DIV_ROUND_UP(0xfffffffaU, 10U) == 429496729U);
 141         assert_se((0xfffffffaU + 10U - 1U) / 10U == 0U);
 142         assert_se(0xfffffffaU / 10U + !!(0xfffffffaU % 10U) == 429496729U);
 143
 144         /* overflow test with rounded division */
 145         assert_se(0xfffffffdU % 10U == 3U);
 146         assert_se(0xfffffffdU / 10U == 429496729U);
 147         assert_se(DIV_ROUND_UP(0xfffffffdU, 10U) == 429496730U);
 148         assert_se((0xfffffffdU + 10U - 1U) / 10U == 0U);
 149         assert_se(0xfffffffdU / 10U + !!(0xfffffffdU % 10U) == 429496730U);
 150 }
 151
 152 static void test_u64log2(void) {
 153         assert_se(u64log2(0) == 0);
 154         assert_se(u64log2(8) == 3);
 155         assert_se(u64log2(9) == 3);
 156         assert_se(u64log2(15) == 3);
 157         assert_se(u64log2(16) == 4);
 158         assert_se(u64log2(1024*1024) == 20);
 159         assert_se(u64log2(1024*1024+5) == 20);
 160 }
 161
 162 static void test_protect_errno(void) {
 163         errno = 12;
 164         {
 165                 PROTECT_ERRNO;
 166                 errno = 11;
 167         }
 168         assert_se(errno == 12);
 169 }
 170
 171 static void test_in_set(void) {
 172         assert_se(IN_SET(1, 1));
 173         assert_se(IN_SET(1, 1, 2, 3, 4));
 174         assert_se(IN_SET(2, 1, 2, 3, 4));
 175         assert_se(IN_SET(3, 1, 2, 3, 4));
 176         assert_se(IN_SET(4, 1, 2, 3, 4));
 177         assert_se(!IN_SET(0, 1));
 178         assert_se(!IN_SET(0, 1, 2, 3, 4));
 179 }
 180
 181 static void test_log2i(void) {
 182         assert_se(log2i(1) == 0);
 183         assert_se(log2i(2) == 1);
 184         assert_se(log2i(3) == 1);
 185         assert_se(log2i(4) == 2);
 186         assert_se(log2i(32) == 5);
 187         assert_se(log2i(33) == 5);
 188         assert_se(log2i(63) == 5);
 189         assert_se(log2i(INT_MAX) == sizeof(int)*8-2);
 190 }
 191
 192 static void test_raw_clone(void) {
 193         pid_t parent, pid, pid2;
 194
 195         parent = getpid();
 196         log_info("before clone: getpid()→"PID_FMT, parent);
 197         assert_se(raw_getpid() == parent);
 198
 199         pid = raw_clone(0);
 200         assert_se(pid >= 0);
 201
 202         pid2 = raw_getpid();
 203         log_info("raw_clone: "PID_FMT" getpid()→"PID_FMT" raw_getpid()→"PID_FMT,
 204                  pid, getpid(), pid2);
 205         if (pid == 0) {
 206                 assert_se(pid2 != parent);
 207                 _exit(EXIT_SUCCESS);
 208         } else {
 209                 int status;
 210
 211                 assert_se(pid2 == parent);
 212                 waitpid(pid, &status, __WCLONE);
 213                 assert_se(WIFEXITED(status) && WEXITSTATUS(status) == EXIT_SUCCESS);
 214         }
 215
 216         errno = 0;
 217         assert_se(raw_clone(CLONE_FS|CLONE_NEWNS) == -1);
 218         assert_se(errno == EINVAL);
 219 }
 220
 221 static void test_physical_memory(void) {
 222         uint64_t p;
 223         char buf[FORMAT_BYTES_MAX];
 224
 225         p = physical_memory();
 226         assert_se(p > 0);
 227         assert_se(p < UINT64_MAX);
 228         assert_se(p % page_size() == 0);
 229
 230         log_info("Memory: %s (%" PRIu64 ")", format_bytes(buf, sizeof(buf), p), p);
 231 }
 232
 233 static void test_physical_memory_scale(void) {
 234         uint64_t p;
 235
 236         p = physical_memory();
 237
 238         assert_se(physical_memory_scale(0, 100) == 0);
 239         assert_se(physical_memory_scale(100, 100) == p);
 240
 241         log_info("Memory original: %" PRIu64, physical_memory());
 242         log_info("Memory scaled by 50%%: %" PRIu64, physical_memory_scale(50, 100));
 243         log_info("Memory divided by 2: %" PRIu64, physical_memory() / 2);
 244         log_info("Page size: %zu", page_size());
 245
 246         /* There might be an uneven number of pages, hence permit these calculations to be half a page off... */
 247         assert_se(page_size()/2 + physical_memory_scale(50, 100) - p/2 <= page_size());
 248         assert_se(physical_memory_scale(200, 100) == p*2);
 249
 250         assert_se(physical_memory_scale(0, 1) == 0);
 251         assert_se(physical_memory_scale(1, 1) == p);
 252         assert_se(physical_memory_scale(2, 1) == p*2);
 253
 254         assert_se(physical_memory_scale(0, 2) == 0);
 255
 256         assert_se(page_size()/2 + physical_memory_scale(1, 2) - p/2 <= page_size());
 257         assert_se(physical_memory_scale(2, 2) == p);
 258         assert_se(physical_memory_scale(4, 2) == p*2);
 259
 260         assert_se(physical_memory_scale(0, UINT32_MAX) == 0);
 261         assert_se(physical_memory_scale(UINT32_MAX, UINT32_MAX) == p);
 262
 263         /* overflow */
 264         assert_se(physical_memory_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
 265 }
 266
 267 static void test_system_tasks_max(void) {
 268         uint64_t t;
 269
 270         t = system_tasks_max();
 271         assert_se(t > 0);
 272         assert_se(t < UINT64_MAX);
 273
 274         log_info("Max tasks: %" PRIu64, t);
 275 }
 276
 277 static void test_system_tasks_max_scale(void) {
 278         uint64_t t;
 279
 280         t = system_tasks_max();
 281
 282         assert_se(system_tasks_max_scale(0, 100) == 0);
 283         assert_se(system_tasks_max_scale(100, 100) == t);
 284
 285         assert_se(system_tasks_max_scale(0, 1) == 0);
 286         assert_se(system_tasks_max_scale(1, 1) == t);
 287         assert_se(system_tasks_max_scale(2, 1) == 2*t);
 288
 289         assert_se(system_tasks_max_scale(0, 2) == 0);
 290         assert_se(system_tasks_max_scale(1, 2) == t/2);
 291         assert_se(system_tasks_max_scale(2, 2) == t);
 292         assert_se(system_tasks_max_scale(3, 2) == (3*t)/2);
 293         assert_se(system_tasks_max_scale(4, 2) == t*2);
 294
 295         assert_se(system_tasks_max_scale(0, UINT32_MAX) == 0);
 296         assert_se(system_tasks_max_scale((UINT32_MAX-1)/2, UINT32_MAX-1) == t/2);
 297         assert_se(system_tasks_max_scale(UINT32_MAX, UINT32_MAX) == t);
 298
 299         /* overflow */
 300
 301         assert_se(system_tasks_max_scale(UINT64_MAX/4, UINT64_MAX) == UINT64_MAX);
 302 }
 303
 304 int main(int argc, char *argv[]) {
 305         log_parse_environment();
 306         log_open();
 307
 308         test_align_power2();
 309         test_max();
 310         test_container_of();
 311         test_div_round_up();
 312         test_u64log2();
 313         test_protect_errno();
 314         test_in_set();
 315         test_log2i();
 316         test_raw_clone();
 317         test_physical_memory();
 318         test_physical_memory_scale();
 319         test_system_tasks_max();
 320         test_system_tasks_max_scale();
 321
 322         return 0;
 323 }