summaryrefslogtreecommitdiff
path: root/tests/test-iov.c
blob: 458ca250994d800ec3ac34eba6cb932b188cbd3f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qemu/iov.h"
#include "qemu/sockets.h"

/* create a randomly-sized iovec with random vectors */
static void iov_random(struct iovec **iovp, unsigned *iov_cntp)
{
     unsigned niov = g_test_rand_int_range(3,8);
     struct iovec *iov = g_malloc(niov * sizeof(*iov));
     unsigned i;
     for (i = 0; i < niov; ++i) {
         iov[i].iov_len = g_test_rand_int_range(5,20);
         iov[i].iov_base = g_malloc(iov[i].iov_len);
     }
     *iovp = iov;
     *iov_cntp = niov;
}

static void iov_free(struct iovec *iov, unsigned niov)
{
    unsigned i;
    for (i = 0; i < niov; ++i) {
        g_free(iov[i].iov_base);
    }
    g_free(iov);
}

static void test_iov_bytes(struct iovec *iov, unsigned niov,
                           size_t offset, size_t bytes)
{
    unsigned i;
    size_t j, o;
    unsigned char *b;
    o = 0;

    /* we walk over all elements, */
    for (i = 0; i < niov; ++i) {
        b = iov[i].iov_base;
        /* over each char of each element, */
        for (j = 0; j < iov[i].iov_len; ++j) {
            /* counting each of them and
             * verifying that the ones within [offset,offset+bytes)
             * range are equal to the position number (o) */
            if (o >= offset && o < offset + bytes) {
                g_assert(b[j] == (o & 255));
            } else {
                g_assert(b[j] == 0xff);
            }
            ++o;
        }
    }
}

static void test_to_from_buf_1(void)
{
     unsigned niov;
     struct iovec *iov;
     size_t sz;
     unsigned char *ibuf, *obuf;
     unsigned i, j, n;

     iov_random(&iov, &niov);

     sz = iov_size(iov, niov);

     ibuf = g_malloc(sz + 8) + 4;
     memcpy(ibuf-4, "aaaa", 4); memcpy(ibuf + sz, "bbbb", 4);
     obuf = g_malloc(sz + 8) + 4;
     memcpy(obuf-4, "xxxx", 4); memcpy(obuf + sz, "yyyy", 4);

     /* fill in ibuf with 0123456... */
     for (i = 0; i < sz; ++i) {
         ibuf[i] = i & 255;
     }

     for (i = 0; i <= sz; ++i) {

         /* Test from/to buf for offset(i) in [0..sz] up to the end of buffer.
          * For last iteration with offset == sz, the procedure should
          * skip whole vector and process exactly 0 bytes */

         /* first set bytes [i..sz) to some "random" value */
         n = iov_memset(iov, niov, 0, 0xff, sz);
         g_assert(n == sz);

         /* next copy bytes [i..sz) from ibuf to iovec */
         n = iov_from_buf(iov, niov, i, ibuf + i, sz - i);
         g_assert(n == sz - i);

         /* clear part of obuf */
         memset(obuf + i, 0, sz - i);
         /* and set this part of obuf to values from iovec */
         n = iov_to_buf(iov, niov, i, obuf + i, sz - i);
         g_assert(n == sz - i);

         /* now compare resulting buffers */
         g_assert(memcmp(ibuf, obuf, sz) == 0);

         /* test just one char */
         n = iov_to_buf(iov, niov, i, obuf + i, 1);
         g_assert(n == (i < sz));
         if (n) {
             g_assert(obuf[i] == (i & 255));
         }

         for (j = i; j <= sz; ++j) {
             /* now test num of bytes cap up to byte no. j,
              * with j in [i..sz]. */

             /* clear iovec */
             n = iov_memset(iov, niov, 0, 0xff, sz);
             g_assert(n == sz);

             /* copy bytes [i..j) from ibuf to iovec */
             n = iov_from_buf(iov, niov, i, ibuf + i, j - i);
             g_assert(n == j - i);

             /* clear part of obuf */
             memset(obuf + i, 0, j - i);

             /* copy bytes [i..j) from iovec to obuf */
             n = iov_to_buf(iov, niov, i, obuf + i, j - i);
             g_assert(n == j - i);

             /* verify result */
             g_assert(memcmp(ibuf, obuf, sz) == 0);

             /* now actually check if the iovec contains the right data */
             test_iov_bytes(iov, niov, i, j - i);
         }
    }
    g_assert(!memcmp(ibuf-4, "aaaa", 4) && !memcmp(ibuf+sz, "bbbb", 4));
    g_free(ibuf-4);
    g_assert(!memcmp(obuf-4, "xxxx", 4) && !memcmp(obuf+sz, "yyyy", 4));
    g_free(obuf-4);
    iov_free(iov, niov);
}

static void test_to_from_buf(void)
{
    int x;
    for (x = 0; x < 4; ++x) {
        test_to_from_buf_1();
    }
}

static void test_io(void)
{
#ifndef _WIN32
/* socketpair(PF_UNIX) which does not exist on windows */

    int sv[2];
    int r;
    unsigned i, j, k, s, t;
    fd_set fds;
    unsigned niov;
    struct iovec *iov, *siov;
    unsigned char *buf;
    size_t sz;

    iov_random(&iov, &niov);
    sz = iov_size(iov, niov);
    buf = g_malloc(sz);
    for (i = 0; i < sz; ++i) {
        buf[i] = i & 255;
    }
    iov_from_buf(iov, niov, 0, buf, sz);

    siov = g_memdup(iov, sizeof(*iov) * niov);

    if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) < 0) {
       perror("socketpair");
       exit(1);
    }

    FD_ZERO(&fds);

    t = 0;
    if (fork() == 0) {
       /* writer */

       close(sv[0]);
       FD_SET(sv[1], &fds);
       fcntl(sv[1], F_SETFL, O_RDWR|O_NONBLOCK);
       r = g_test_rand_int_range(sz / 2, sz);
       setsockopt(sv[1], SOL_SOCKET, SO_SNDBUF, &r, sizeof(r));

       for (i = 0; i <= sz; ++i) {
           for (j = i; j <= sz; ++j) {
               k = i;
               do {
                   s = g_test_rand_int_range(0, j - k + 1);
                   r = iov_send(sv[1], iov, niov, k, s);
                   g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
                   if (r >= 0) {
                       k += r;
                       t += r;
                       usleep(g_test_rand_int_range(0, 30));
                   } else if (errno == EAGAIN) {
                       select(sv[1]+1, NULL, &fds, NULL, NULL);
                       continue;
                   } else {
                       perror("send");
                       exit(1);
                   }
               } while(k < j);
           }
       }
       iov_free(iov, niov);
       g_free(buf);
       g_free(siov);
       exit(0);

    } else {
       /* reader & verifier */

       close(sv[1]);
       FD_SET(sv[0], &fds);
       fcntl(sv[0], F_SETFL, O_RDWR|O_NONBLOCK);
       r = g_test_rand_int_range(sz / 2, sz);
       setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &r, sizeof(r));
       usleep(500000);

       for (i = 0; i <= sz; ++i) {
           for (j = i; j <= sz; ++j) {
               k = i;
               iov_memset(iov, niov, 0, 0xff, sz);
               do {
                   s = g_test_rand_int_range(0, j - k + 1);
                   r = iov_recv(sv[0], iov, niov, k, s);
                   g_assert(memcmp(iov, siov, sizeof(*iov)*niov) == 0);
                   if (r > 0) {
                       k += r;
                       t += r;
                   } else if (!r) {
                       if (s) {
                           break;
                       }
                   } else if (errno == EAGAIN) {
                       select(sv[0]+1, &fds, NULL, NULL, NULL);
                       continue;
                   } else {
                       perror("recv");
                       exit(1);
                   }
               } while(k < j);
               test_iov_bytes(iov, niov, i, j - i);
           }
        }

       iov_free(iov, niov);
       g_free(buf);
       g_free(siov);
     }
#endif
}

static void test_discard_front(void)
{
    struct iovec *iov;
    struct iovec *iov_tmp;
    unsigned int iov_cnt;
    unsigned int iov_cnt_tmp;
    void *old_base;
    size_t size;
    size_t ret;

    /* Discard zero bytes */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, 0);
    g_assert(ret == 0);
    g_assert(iov_tmp == iov);
    g_assert(iov_cnt_tmp == iov_cnt);
    iov_free(iov, iov_cnt);

    /* Discard more bytes than vector size */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    size = iov_size(iov, iov_cnt);
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size + 1);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == 0);
    iov_free(iov, iov_cnt);

    /* Discard entire vector */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    size = iov_size(iov, iov_cnt);
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == 0);
    iov_free(iov, iov_cnt);

    /* Discard within first element */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    old_base = iov->iov_base;
    size = g_test_rand_int_range(1, iov->iov_len);
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_tmp == iov);
    g_assert(iov_cnt_tmp == iov_cnt);
    g_assert(iov_tmp->iov_base == old_base + size);
    iov_tmp->iov_base = old_base; /* undo before g_free() */
    iov_free(iov, iov_cnt);

    /* Discard entire first element */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, iov->iov_len);
    g_assert(ret == iov->iov_len);
    g_assert(iov_tmp == iov + 1);
    g_assert(iov_cnt_tmp == iov_cnt - 1);
    iov_free(iov, iov_cnt);

    /* Discard within second element */
    iov_random(&iov, &iov_cnt);
    iov_tmp = iov;
    iov_cnt_tmp = iov_cnt;
    old_base = iov[1].iov_base;
    size = iov->iov_len + g_test_rand_int_range(1, iov[1].iov_len);
    ret = iov_discard_front(&iov_tmp, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_tmp == iov + 1);
    g_assert(iov_cnt_tmp == iov_cnt - 1);
    g_assert(iov_tmp->iov_base == old_base + (size - iov->iov_len));
    iov_tmp->iov_base = old_base; /* undo before g_free() */
    iov_free(iov, iov_cnt);
}

static void test_discard_back(void)
{
    struct iovec *iov;
    unsigned int iov_cnt;
    unsigned int iov_cnt_tmp;
    void *old_base;
    size_t size;
    size_t ret;

    /* Discard zero bytes */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    ret = iov_discard_back(iov, &iov_cnt_tmp, 0);
    g_assert(ret == 0);
    g_assert(iov_cnt_tmp == iov_cnt);
    iov_free(iov, iov_cnt);

    /* Discard more bytes than vector size */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    size = iov_size(iov, iov_cnt);
    ret = iov_discard_back(iov, &iov_cnt_tmp, size + 1);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == 0);
    iov_free(iov, iov_cnt);

    /* Discard entire vector */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    size = iov_size(iov, iov_cnt);
    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == 0);
    iov_free(iov, iov_cnt);

    /* Discard within last element */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    old_base = iov[iov_cnt - 1].iov_base;
    size = g_test_rand_int_range(1, iov[iov_cnt - 1].iov_len);
    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == iov_cnt);
    g_assert(iov[iov_cnt - 1].iov_base == old_base);
    iov_free(iov, iov_cnt);

    /* Discard entire last element */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    old_base = iov[iov_cnt - 1].iov_base;
    size = iov[iov_cnt - 1].iov_len;
    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == iov_cnt - 1);
    iov_free(iov, iov_cnt);

    /* Discard within second-to-last element */
    iov_random(&iov, &iov_cnt);
    iov_cnt_tmp = iov_cnt;
    old_base = iov[iov_cnt - 2].iov_base;
    size = iov[iov_cnt - 1].iov_len +
           g_test_rand_int_range(1, iov[iov_cnt - 2].iov_len);
    ret = iov_discard_back(iov, &iov_cnt_tmp, size);
    g_assert(ret == size);
    g_assert(iov_cnt_tmp == iov_cnt - 1);
    g_assert(iov[iov_cnt - 2].iov_base == old_base);
    iov_free(iov, iov_cnt);
}

int main(int argc, char **argv)
{
    g_test_init(&argc, &argv, NULL);
    g_test_rand_int();
    g_test_add_func("/basic/iov/from-to-buf", test_to_from_buf);
    g_test_add_func("/basic/iov/io", test_io);
    g_test_add_func("/basic/iov/discard-front", test_discard_front);
    g_test_add_func("/basic/iov/discard-back", test_discard_back);
    return g_test_run();
}