tests/io-channel-helpers.c

   1 /*
   2  * QEMU I/O channel test helpers
   3  *
   4  * Copyright (c) 2015 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "io-channel-helpers.h"
  23 #include "qemu/iov.h"
  24
  25 struct QIOChannelTest {
  26     QIOChannel *src;
  27     QIOChannel *dst;
  28     bool blocking;
  29     size_t len;
  30     size_t niov;
  31     char *input;
  32     struct iovec *inputv;
  33     char *output;
  34     struct iovec *outputv;
  35     Error *writeerr;
  36     Error *readerr;
  37 };
  38
  39
  40 /* This thread sends all data using iovecs */
  41 static gpointer test_io_thread_writer(gpointer opaque)
  42 {
  43     QIOChannelTest *data = opaque;
  44
  45     qio_channel_set_blocking(data->src, data->blocking, NULL);
  46
  47     qio_channel_writev_all(data->src,
  48                            data->inputv,
  49                            data->niov,
  50                            &data->writeerr);
  51
  52     return NULL;
  53 }
  54
  55
  56 /* This thread receives all data using iovecs */
  57 static gpointer test_io_thread_reader(gpointer opaque)
  58 {
  59     QIOChannelTest *data = opaque;
  60
  61     qio_channel_set_blocking(data->dst, data->blocking, NULL);
  62
  63     qio_channel_readv_all(data->dst,
  64                           data->outputv,
  65                           data->niov,
  66                           &data->readerr);
  67
  68     return NULL;
  69 }
  70
  71
  72 QIOChannelTest *qio_channel_test_new(void)
  73 {
  74     QIOChannelTest *data = g_new0(QIOChannelTest, 1);
  75     size_t i;
  76     size_t offset;
  77
  78
  79     /* We'll send 1 MB of data */
  80 #define CHUNK_COUNT 250
  81 #define CHUNK_LEN 4194
  82
  83     data->len = CHUNK_COUNT * CHUNK_LEN;
  84     data->input = g_new0(char, data->len);
  85     data->output = g_new0(gchar, data->len);
  86
  87     /* Fill input with a pattern */
  88     for (i = 0; i < data->len; i += CHUNK_LEN) {
  89         memset(data->input + i, (i / CHUNK_LEN), CHUNK_LEN);
  90     }
  91
  92     /* We'll split the data across a bunch of IO vecs */
  93     data->niov = CHUNK_COUNT;
  94     data->inputv = g_new0(struct iovec, data->niov);
  95     data->outputv = g_new0(struct iovec, data->niov);
  96
  97     for (i = 0, offset = 0; i < data->niov; i++, offset += CHUNK_LEN) {
  98         data->inputv[i].iov_base = data->input + offset;
  99         data->outputv[i].iov_base = data->output + offset;
 100         data->inputv[i].iov_len = CHUNK_LEN;
 101         data->outputv[i].iov_len = CHUNK_LEN;
 102     }
 103
 104     return data;
 105 }
 106
 107 void qio_channel_test_run_threads(QIOChannelTest *test,
 108                                   bool blocking,
 109                                   QIOChannel *src,
 110                                   QIOChannel *dst)
 111 {
 112     GThread *reader, *writer;
 113
 114     test->src = src;
 115     test->dst = dst;
 116     test->blocking = blocking;
 117
 118     reader = g_thread_new("reader",
 119                           test_io_thread_reader,
 120                           test);
 121     writer = g_thread_new("writer",
 122                           test_io_thread_writer,
 123                           test);
 124
 125     g_thread_join(reader);
 126     g_thread_join(writer);
 127
 128     test->dst = test->src = NULL;
 129 }
 130
 131
 132 void qio_channel_test_run_writer(QIOChannelTest *test,
 133                                  QIOChannel *src)
 134 {
 135     test->src = src;
 136     test_io_thread_writer(test);
 137     test->src = NULL;
 138 }
 139
 140
 141 void qio_channel_test_run_reader(QIOChannelTest *test,
 142                                  QIOChannel *dst)
 143 {
 144     test->dst = dst;
 145     test_io_thread_reader(test);
 146     test->dst = NULL;
 147 }
 148
 149
 150 void qio_channel_test_validate(QIOChannelTest *test)
 151 {
 152     g_assert(test->readerr == NULL);
 153     g_assert(test->writeerr == NULL);
 154     g_assert_cmpint(memcmp(test->input,
 155                            test->output,
 156                            test->len), ==, 0);
 157
 158     g_free(test->inputv);
 159     g_free(test->outputv);
 160     g_free(test->input);
 161     g_free(test->output);
 162     g_free(test);
 163 }