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annotate src/lib-test/test-ostream.c @ 20810:5856fd118fb3

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lib-test: Added test_ostream for testing nonblocking ostreams.
author Timo Sirainen <timo.sirainen@dovecot.fi>
date Fri, 30 Sep 2016 13:42:45 +0300
parents
children d2969430234a
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20810
5856fd118fb3 lib-test: Added test_ostream for testing nonblocking ostreams.
Timo Sirainen <timo.sirainen@dovecot.fi>
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1 /* Copyright (c) 2016 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "buffer.h"
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5 #include "ostream-private.h"
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6 #include "test-common.h"
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7
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8 struct test_ostream {
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9 struct ostream_private ostream;
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10 buffer_t *internal_buf;
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11 buffer_t *output_buf;
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12 size_t max_output_size;
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13 struct timeout *to;
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14 bool flush_pending;
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15 };
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16
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17 static void o_stream_test_destroy(struct iostream_private *stream)
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18 {
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19 struct test_ostream *tstream = (struct test_ostream *)stream;
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20
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21 if (tstream->to != NULL)
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22 timeout_remove(&tstream->to);
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23 if (tstream->internal_buf != NULL)
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24 i_free(tstream->internal_buf);
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25 }
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26
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27 static int o_stream_test_flush(struct ostream_private *stream)
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28 {
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29 struct test_ostream *tstream = (struct test_ostream *)stream;
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30
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31 if (tstream->internal_buf == NULL || tstream->internal_buf->used == 0)
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32 return 1;
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33 if (tstream->output_buf->used >= tstream->max_output_size)
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34 return 0;
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35
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36 size_t left = tstream->max_output_size - tstream->output_buf->used;
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37 size_t n = I_MIN(left, tstream->internal_buf->used);
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38 buffer_append(tstream->output_buf, tstream->internal_buf->data, n);
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39 buffer_delete(tstream->internal_buf, 0, n);
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40 return tstream->internal_buf->used == 0 ? 1 : 0;
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41 }
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42
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43 static ssize_t
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44 o_stream_test_sendv(struct ostream_private *stream,
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45 const struct const_iovec *iov, unsigned int iov_count)
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46 {
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47 struct test_ostream *tstream = (struct test_ostream *)stream;
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48 struct const_iovec cur_iov = { NULL, 0 };
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49 size_t left, n;
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50 ssize_t ret = 0;
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51 unsigned int i;
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52
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53 /* first we need to try to flush the internal buffer */
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54 if ((ret = o_stream_test_flush(stream)) <= 0)
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55 return ret;
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56
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57 /* append to output_buf until max_output_size is reached */
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58 ret = 0;
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59 for (i = 0; i < iov_count; i++) {
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60 left = tstream->max_output_size < tstream->output_buf->used ? 0 :
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61 tstream->max_output_size - tstream->output_buf->used;
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62 n = I_MIN(left, iov[i].iov_len);
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63 buffer_append(tstream->output_buf, iov[i].iov_base, n);
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64 stream->ostream.offset += n;
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65 ret += n;
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66 if (n != iov[i].iov_len) {
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67 cur_iov.iov_base = CONST_PTR_OFFSET(iov[i].iov_base, n);
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68 cur_iov.iov_len = iov[i].iov_len - n;
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69 break;
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70 }
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71 }
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72 /* if we've internal_buf, append to it until max_buffer_size is
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73 reached */
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74 if (i == iov_count || tstream->internal_buf == NULL)
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75 return ret;
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76 do {
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77 left = tstream->ostream.max_buffer_size -
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78 tstream->internal_buf->used;
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79 n = I_MIN(left, cur_iov.iov_len);
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80 buffer_append(tstream->internal_buf, cur_iov.iov_base, n);
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81 stream->ostream.offset += n;
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82 ret += n;
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83 if (n != cur_iov.iov_len)
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84 break;
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85 cur_iov = iov[++i];
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86 } while (i < iov_count);
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87
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88 tstream->flush_pending = TRUE;
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89 return ret;
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90 }
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91
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92 static void test_ostream_send_more(struct test_ostream *tstream)
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93 {
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94 struct ostream *ostream = &tstream->ostream.ostream;
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95 int ret;
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96
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97 o_stream_ref(ostream);
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98 tstream->flush_pending = FALSE;
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99 if (tstream->ostream.callback != NULL)
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100 ret = tstream->ostream.callback(tstream->ostream.context);
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101 else
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102 ret = o_stream_test_flush(&tstream->ostream);
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103 if (ret == 0 || (tstream->internal_buf != NULL &&
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104 tstream->internal_buf->used > 0))
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105 tstream->flush_pending = TRUE;
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106 if (!tstream->flush_pending ||
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107 tstream->output_buf->used >= tstream->max_output_size)
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108 timeout_remove(&tstream->to);
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109 o_stream_unref(&ostream);
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110 }
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111
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112 static void test_ostream_set_send_more_timeout(struct test_ostream *tstream)
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113 {
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114 if (tstream->to == NULL && tstream->flush_pending &&
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115 tstream->output_buf->used < tstream->max_output_size)
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116 tstream->to = timeout_add_short(0, test_ostream_send_more, tstream);
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117 }
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118
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119 static void
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120 o_stream_test_flush_pending(struct ostream_private *stream, bool set)
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121 {
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122 struct test_ostream *tstream = (struct test_ostream *)stream;
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123
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124 if (tstream->internal_buf != NULL && tstream->internal_buf->used > 0) {
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125 /* we have internal data, won't reset flush_pending */
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126 i_assert(tstream->flush_pending);
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127 } else {
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128 tstream->flush_pending = set;
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129 }
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130 if (set)
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131 test_ostream_set_send_more_timeout(tstream);
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132 }
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133
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134 static size_t
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135 o_stream_test_get_used_size(const struct ostream_private *stream)
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136 {
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137 struct test_ostream *tstream = (struct test_ostream *)stream;
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138
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139 return tstream->internal_buf == NULL ? 0 :
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140 tstream->internal_buf->used;
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141 }
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142
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143 struct ostream *test_ostream_create(buffer_t *output)
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144 {
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145 struct test_ostream *tstream;
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146 struct ostream *ostream;
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147
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148 tstream = i_new(struct test_ostream, 1);
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149 tstream->ostream.max_buffer_size = (size_t)-1;
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150 tstream->ostream.iostream.destroy = o_stream_test_destroy;
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151 tstream->ostream.sendv = o_stream_test_sendv;
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152 tstream->ostream.flush = o_stream_test_flush;
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153 tstream->ostream.flush_pending = o_stream_test_flush_pending;
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154 tstream->ostream.get_used_size = o_stream_test_get_used_size;
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155 tstream->ostream.ostream.blocking = TRUE;
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156
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157 tstream->output_buf = output;
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158 tstream->max_output_size = (size_t)-1;
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159 ostream = o_stream_create(&tstream->ostream, NULL, -1);
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160 o_stream_set_name(ostream, "(test-ostream)");
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161 return ostream;
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162 }
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163
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164 struct ostream *test_ostream_create_nonblocking(buffer_t *output,
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165 size_t max_internal_buffer_size)
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166 {
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167 struct test_ostream *tstream;
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168
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169 tstream = (struct test_ostream *)test_ostream_create(output)->real_stream;
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170 tstream->internal_buf = buffer_create_dynamic(default_pool, 128);
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171 tstream->ostream.ostream.blocking = FALSE;
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172 tstream->ostream.max_buffer_size = max_internal_buffer_size;
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173 return &tstream->ostream.ostream;
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174 }
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175
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176 static struct test_ostream *test_ostream_find(struct ostream *output)
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177 {
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178 struct ostream *out;
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179
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180 for (out = output; out != NULL; out = out->real_stream->parent) {
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181 if (out->real_stream->sendv == o_stream_test_sendv)
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182 return (struct test_ostream *)out->real_stream;
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183 }
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184 i_panic("%s isn't test-ostream", o_stream_get_name(output));
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185 }
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186
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187 void test_ostream_set_max_output_size(struct ostream *output, size_t max_size)
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188 {
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189 struct test_ostream *tstream = test_ostream_find(output);
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190
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191 tstream->max_output_size = max_size;
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192 test_ostream_set_send_more_timeout(tstream);
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193 }