LXR qemu/tests/test-iov.c

   1#include "qemu/osdep.h"
   2#include "qemu-common.h"
   3#include "qemu/iov.h"
   4#include "qemu/sockets.h"
   5
   6/* create a randomly-sized iovec with random vectors */
   7static void iov_random(struct iovec **iovp, unsigned *iov_cntp)
   8{
   9     unsigned niov = g_test_rand_int_range(3,8);
  10     struct iovec *iov = g_malloc(niov * sizeof(*iov));
  11     unsigned i;
  12     for (i = 0; i < niov; ++i) {
  13         iov[i].iov_len = g_test_rand_int_range(5,20);
  14         iov[i].iov_base = g_malloc(iov[i].iov_len);
  15     }
  16     *iovp = iov;
  17     *iov_cntp = niov;
  18}
  19
  20static void iov_free(struct iovec *iov, unsigned niov)
  21{
  22    unsigned i;
  23    for (i = 0; i < niov; ++i) {
  24        g_free(iov[i].iov_base);
  25    }
  26    g_free(iov);
  27}
  28
  29static void test_iov_bytes(struct iovec *iov, unsigned niov,
  30                           size_t offset, size_t bytes)
  31{
  32    unsigned i;
  33    size_t j, o;
  34    unsigned char *b;
  35    o = 0;
  36
  37    /* we walk over all elements, */
  38    for (i = 0; i < niov; ++i) {
  39        b = iov[i].iov_base;
  40        /* over each char of each element, */
  41        for (j = 0; j < iov[i].iov_len; ++j) {
  42            /* counting each of them and
  43             * verifying that the ones within [offset,offset+bytes)
  44             * range are equal to the position number (o) */
  45            if (o >= offset && o < offset + bytes) {
  46                g_assert(b[j] == (o & 255));
  47            } else {
  48                g_assert(b[j] == 0xff);
  49            }
  50            ++o;
  51        }
  52    }
  53}
  54
  55static void test_to_from_buf_1(void)
  56{
  57     unsigned niov;
  58     struct iovec *iov;
  59     size_t sz;
  60     unsigned char *ibuf, *obuf;
  61     unsigned i, j, n;
  62
  63     iov_random(&iov, &niov);
  64
  65     sz = iov_size(iov, niov);
  66
  67     ibuf = g_malloc(sz + 8) + 4;
  68     memcpy(ibuf-4, "aaaa", 4); memcpy(ibuf + sz, "bbbb", 4);
  69     obuf = g_malloc(sz + 8) + 4;
  70     memcpy(obuf-4, "xxxx", 4); memcpy(obuf + sz, "yyyy", 4);
  71
  72     /* fill in ibuf with 0123456... */
  73     for (i = 0; i < sz; ++i) {
  74         ibuf[i] = i & 255;
  75     }
  76
  77     for (i = 0; i <= sz; ++i) {
  78
  79         /* Test from/to buf for offset(i) in [0..sz] up to the end of buffer.
  80          * For last iteration with offset == sz, the procedure should
  81          * skip whole vector and process exactly 0 bytes */
  82
  83         /* first set bytes [i..sz) to some "random" value */
  84         n = iov_memset(iov, niov, 0, 0xff, sz);
  85         g_assert(n == sz);
  86
  87         /* next copy bytes [i..sz) from ibuf to iovec */
  88         n = iov_from_buf(iov, niov, i, ibuf + i, sz - i);
  89         g_assert(n == sz - i);
  90
  91         /* clear part of obuf */
  92         memset(obuf + i, 0, sz - i);
  93         /* and set this part of obuf to values from iovec */
  94         n = iov_to_buf(iov, niov, i, obuf + i, sz - i);
  95         g_assert(n == sz - i);
  96
  97         /* now compare resulting buffers */
  98         g_assert(memcmp(ibuf, obuf, sz) == 0);
  99
 100         /* test just one char */
 101         n = iov_to_buf(iov, niov, i, obuf + i, 1);
 102         g_assert(n == (i < sz));
 103         if (n) {
 104             g_assert(obuf[i] == (i & 255));
 105         }
 106
 107         for (j = i; j <= sz; ++j) {
 108             /* now test num of bytes cap up to byte no. j,
 109              * with j in [i..sz]. */
 110
 111             /* clear iovec */
 112             n = iov_memset(iov, niov, 0, 0xff, sz);
 113             g_assert(n == sz);
 114
 115             /* copy bytes [i..j) from ibuf to iovec */
 116             n = iov_from_buf(iov, niov, i, ibuf + i, j - i);
 117             g_assert(n == j - i);
 118
 119             /* clear part of obuf */
 120             memset(obuf + i, 0, j - i);
 121
 122             /* copy bytes [i..j) from iovec to obuf */
 123             n = iov_to_buf(iov, niov, i, obuf + i, j - i);
 124             g_assert(n == j - i);
 125
 126             /* verify result */
 127             g_assert(memcmp(ibuf, obuf, sz) == 0);
 128
 129             /* now actually check if the iovec contains the right data */
 130             test_iov_bytes(iov, niov, i, j - i);
 131         }
 132    }
 133    g_assert(!memcmp(ibuf-4, "aaaa", 4) && !memcmp(ibuf+sz, "bbbb", 4));
 134    g_free(ibuf-4);
 135    g_assert(!memcmp(obuf-4, "xxxx", 4) && !memcmp(obuf+sz, "yyyy", 4));
 136    g_free(obuf-4);
 137    iov_free(iov, niov);
 138}
 139
 140static void test_to_from_buf(void)
 141{
 142    int x;
 143    for (x = 0; x < 4; ++x) {
 144        test_to_from_buf_1();
 145    }
 146}
 147
 148static void test_io(void)
 149{
 150#ifndef _WIN32
 151/* socketpair(PF_UNIX) which does not exist on windows */
 152
 153    int sv[2];
 154    int r;
 155    unsigned i, j, k, s, t;
 156    fd_set fds;
 157    unsigned niov;
 158    struct iovec *iov, *siov;
 159    unsigned char *buf;
 160    size_t sz;
 161
 162    iov_random(&iov, &niov);
 163    sz = iov_size(iov, niov);
 164    buf = g_malloc(sz);
 165    for (i = 0; i < sz; ++i) {
 166        buf[i] = i & 255;
 167    }
 168    iov_from_buf(iov, niov, 0, buf, sz);
 169
 170    siov = g_memdup(iov, sizeof(*iov) * niov);
 171
 172    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0) {
 173       perror("socketpair");
 174       exit(1);
 175    }
 176
 177    FD_ZERO(&fds);
 178
 179    t = 0;
 180    if (fork() == 0) {
 181       /* writer */
 182
 183       close(sv[0]);
 184       FD_SET(sv[1], &fds);
 185       fcntl(sv[1], F_SETFL, O_RDWR|O_NONBLOCK);
 186       r = g_test_rand_int_range(sz / 2, sz);
 187       setsockopt(sv[1], SOL_SOCKET, SO_SNDBUF, &r, sizeof(r));
 188
 189       for (i = 0; i <= sz; ++i) {
 190           for (j = i; j <= sz; ++j) {
 191               k = i;
 192               do {
 193                   s = g_test_rand_int_range(0, j - k + 1);
 194                   r = iov_send(sv[1], iov, niov, k, s);
 195                   g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
 196                   if (r >= 0) {
 197                       k += r;
 198                       t += r;
 199                       usleep(g_test_rand_int_range(0, 30));
 200                   } else if (errno == EAGAIN) {
 201                       select(sv[1]+1, NULL, &fds, NULL, NULL);
 202                       continue;
 203                   } else {
 204                       perror("send");
 205                       exit(1);
 206                   }
 207               } while(k < j);
 208           }
 209       }
 210       iov_free(iov, niov);
 211       g_free(buf);
 212       g_free(siov);
 213       exit(0);
 214
 215    } else {
 216       /* reader & verifier */
 217
 218       close(sv[1]);
 219       FD_SET(sv[0], &fds);
 220       fcntl(sv[0], F_SETFL, O_RDWR|O_NONBLOCK);
 221       r = g_test_rand_int_range(sz / 2, sz);
 222       setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &r, sizeof(r));
 223       usleep(500000);
 224
 225       for (i = 0; i <= sz; ++i) {
 226           for (j = i; j <= sz; ++j) {
 227               k = i;
 228               iov_memset(iov, niov, 0, 0xff, sz);
 229               do {
 230                   s = g_test_rand_int_range(0, j - k + 1);
 231                   r = iov_recv(sv[0], iov, niov, k, s);
 232                   g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
 233                   if (r > 0) {
 234                       k += r;
 235                       t += r;
 236                   } else if (!r) {
 237                       if (s) {
 238                           break;
 239                       }
 240                   } else if (errno == EAGAIN) {
 241                       select(sv[0]+1, &fds, NULL, NULL, NULL);
 242                       continue;
 243                   } else {
 244                       perror("recv");
 245                       exit(1);
 246                   }
 247               } while(k < j);
 248               test_iov_bytes(iov, niov, i, j - i);
 249           }
 250        }
 251
 252       iov_free(iov, niov);
 253       g_free(buf);
 254       g_free(siov);
 255     }
 256#endif
 257}
 258
 259static void test_discard_front(void)
 260{
 261    struct iovec *iov;
 262    struct iovec *iov_tmp;
 263    unsigned int iov_cnt;
 264    unsigned int iov_cnt_tmp;
 265    void *old_base;
 266    size_t size;
 267    size_t ret;
 268
 269    /* Discard zero bytes */
 270    iov_random(&iov, &iov_cnt);
 271    iov_tmp = iov;
 272    iov_cnt_tmp = iov_cnt;
 273    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, 0);
 274    g_assert(ret == 0);
 275    g_assert(iov_tmp == iov);
 276    g_assert(iov_cnt_tmp == iov_cnt);
 277    iov_free(iov, iov_cnt);
 278
 279    /* Discard more bytes than vector size */
 280    iov_random(&iov, &iov_cnt);
 281    iov_tmp = iov;
 282    iov_cnt_tmp = iov_cnt;
 283    size = iov_size(iov, iov_cnt);
 284    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size + 1);
 285    g_assert(ret == size);
 286    g_assert(iov_cnt_tmp == 0);
 287    iov_free(iov, iov_cnt);
 288
 289    /* Discard entire vector */
 290    iov_random(&iov, &iov_cnt);
 291    iov_tmp = iov;
 292    iov_cnt_tmp = iov_cnt;
 293    size = iov_size(iov, iov_cnt);
 294    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
 295    g_assert(ret == size);
 296    g_assert(iov_cnt_tmp == 0);
 297    iov_free(iov, iov_cnt);
 298
 299    /* Discard within first element */
 300    iov_random(&iov, &iov_cnt);
 301    iov_tmp = iov;
 302    iov_cnt_tmp = iov_cnt;
 303    old_base = iov->iov_base;
 304    size = g_test_rand_int_range(1, iov->iov_len);
 305    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
 306    g_assert(ret == size);
 307    g_assert(iov_tmp == iov);
 308    g_assert(iov_cnt_tmp == iov_cnt);
 309    g_assert(iov_tmp->iov_base == old_base + size);
 310    iov_tmp->iov_base = old_base; /* undo before g_free() */
 311    iov_free(iov, iov_cnt);
 312
 313    /* Discard entire first element */
 314    iov_random(&iov, &iov_cnt);
 315    iov_tmp = iov;
 316    iov_cnt_tmp = iov_cnt;
 317    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, iov->iov_len);
 318    g_assert(ret == iov->iov_len);
 319    g_assert(iov_tmp == iov + 1);
 320    g_assert(iov_cnt_tmp == iov_cnt - 1);
 321    iov_free(iov, iov_cnt);
 322
 323    /* Discard within second element */
 324    iov_random(&iov, &iov_cnt);
 325    iov_tmp = iov;
 326    iov_cnt_tmp = iov_cnt;
 327    old_base = iov[1].iov_base;
 328    size = iov->iov_len + g_test_rand_int_range(1, iov[1].iov_len);
 329    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
 330    g_assert(ret == size);
 331    g_assert(iov_tmp == iov + 1);
 332    g_assert(iov_cnt_tmp == iov_cnt - 1);
 333    g_assert(iov_tmp->iov_base == old_base + (size - iov->iov_len));
 334    iov_tmp->iov_base = old_base; /* undo before g_free() */
 335    iov_free(iov, iov_cnt);
 336}
 337
 338static void test_discard_back(void)
 339{
 340    struct iovec *iov;
 341    unsigned int iov_cnt;
 342    unsigned int iov_cnt_tmp;
 343    void *old_base;
 344    size_t size;
 345    size_t ret;
 346
 347    /* Discard zero bytes */
 348    iov_random(&iov, &iov_cnt);
 349    iov_cnt_tmp = iov_cnt;
 350    ret = iov_discard_back(iov, &iov_cnt_tmp, 0);
 351    g_assert(ret == 0);
 352    g_assert(iov_cnt_tmp == iov_cnt);
 353    iov_free(iov, iov_cnt);
 354
 355    /* Discard more bytes than vector size */
 356    iov_random(&iov, &iov_cnt);
 357    iov_cnt_tmp = iov_cnt;
 358    size = iov_size(iov, iov_cnt);
 359    ret = iov_discard_back(iov, &iov_cnt_tmp, size + 1);
 360    g_assert(ret == size);
 361    g_assert(iov_cnt_tmp == 0);
 362    iov_free(iov, iov_cnt);
 363
 364    /* Discard entire vector */
 365    iov_random(&iov, &iov_cnt);
 366    iov_cnt_tmp = iov_cnt;
 367    size = iov_size(iov, iov_cnt);
 368    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
 369    g_assert(ret == size);
 370    g_assert(iov_cnt_tmp == 0);
 371    iov_free(iov, iov_cnt);
 372
 373    /* Discard within last element */
 374    iov_random(&iov, &iov_cnt);
 375    iov_cnt_tmp = iov_cnt;
 376    old_base = iov[iov_cnt - 1].iov_base;
 377    size = g_test_rand_int_range(1, iov[iov_cnt - 1].iov_len);
 378    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
 379    g_assert(ret == size);
 380    g_assert(iov_cnt_tmp == iov_cnt);
 381    g_assert(iov[iov_cnt - 1].iov_base == old_base);
 382    iov_free(iov, iov_cnt);
 383
 384    /* Discard entire last element */
 385    iov_random(&iov, &iov_cnt);
 386    iov_cnt_tmp = iov_cnt;
 387    old_base = iov[iov_cnt - 1].iov_base;
 388    size = iov[iov_cnt - 1].iov_len;
 389    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
 390    g_assert(ret == size);
 391    g_assert(iov_cnt_tmp == iov_cnt - 1);
 392    iov_free(iov, iov_cnt);
 393
 394    /* Discard within second-to-last element */
 395    iov_random(&iov, &iov_cnt);
 396    iov_cnt_tmp = iov_cnt;
 397    old_base = iov[iov_cnt - 2].iov_base;
 398    size = iov[iov_cnt - 1].iov_len +
 399           g_test_rand_int_range(1, iov[iov_cnt - 2].iov_len);
 400    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
 401    g_assert(ret == size);
 402    g_assert(iov_cnt_tmp == iov_cnt - 1);
 403    g_assert(iov[iov_cnt - 2].iov_base == old_base);
 404    iov_free(iov, iov_cnt);
 405}
 406
 407int main(int argc, char **argv)
 408{
 409    g_test_init(&argc, &argv, NULL);
 410    g_test_rand_int();
 411    g_test_add_func("/basic/iov/from-to-buf", test_to_from_buf);
 412    g_test_add_func("/basic/iov/io", test_io);
 413    g_test_add_func("/basic/iov/discard-front", test_discard_front);
 414    g_test_add_func("/basic/iov/discard-back", test_discard_back);
 415    return g_test_run();
 416}
 417