Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_readv_chain.c @ 5860:c9787372f16d
Limit conn: use complex value in limit_conn_zone (ticket #121).
One intentional side effect of this change is that key is allowed only
in the first position. Previously, it was possible to specify the key
variable at any position, but that was never documented, and is contrary
to nginx configuration practice for positional parameters.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Wed, 24 Sep 2014 21:55:19 +0400 |
parents | a0a14319968b |
children | ec81934727a1 |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
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8 #include <ngx_config.h> |
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9 #include <ngx_core.h> |
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10 #include <ngx_event.h> |
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11 |
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12 |
501 | 13 ssize_t |
14 ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) | |
73
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15 { |
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16 u_char *prev; |
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17 ssize_t n, size; |
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18 ngx_err_t err; |
501 | 19 ngx_array_t vec; |
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20 ngx_event_t *rev; |
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21 struct iovec *iov, iovs[NGX_IOVS_PREALLOCATE]; |
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22 |
577 | 23 rev = c->read; |
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24 |
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25 #if (NGX_HAVE_KQUEUE) |
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26 |
455 | 27 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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28 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
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29 "readv: eof:%d, avail:%d, err:%d", |
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30 rev->pending_eof, rev->available, rev->kq_errno); |
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31 |
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32 if (rev->available == 0) { |
587 | 33 if (rev->pending_eof) { |
188
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34 rev->ready = 0; |
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35 rev->eof = 1; |
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36 |
587 | 37 ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, |
38 "kevent() reported about an closed connection"); | |
39 | |
188
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40 if (rev->kq_errno) { |
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41 rev->error = 1; |
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42 ngx_set_socket_errno(rev->kq_errno); |
587 | 43 return NGX_ERROR; |
188
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44 } |
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45 |
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46 return 0; |
587 | 47 |
48 } else { | |
49 return NGX_AGAIN; | |
188
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50 } |
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51 } |
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52 } |
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53 |
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54 #endif |
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55 |
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56 prev = NULL; |
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57 iov = NULL; |
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58 size = 0; |
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59 |
501 | 60 vec.elts = iovs; |
61 vec.nelts = 0; | |
62 vec.size = sizeof(struct iovec); | |
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63 vec.nalloc = NGX_IOVS_PREALLOCATE; |
501 | 64 vec.pool = c->pool; |
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65 |
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66 /* coalesce the neighbouring bufs */ |
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67 |
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68 while (chain) { |
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69 if (prev == chain->buf->last) { |
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70 iov->iov_len += chain->buf->end - chain->buf->last; |
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71 |
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72 } else { |
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73 if (vec.nelts >= IOV_MAX) { |
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74 break; |
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75 } |
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76 |
501 | 77 iov = ngx_array_push(&vec); |
78 if (iov == NULL) { | |
79 return NGX_ERROR; | |
80 } | |
81 | |
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82 iov->iov_base = (void *) chain->buf->last; |
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83 iov->iov_len = chain->buf->end - chain->buf->last; |
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84 } |
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85 |
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86 size += chain->buf->end - chain->buf->last; |
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87 prev = chain->buf->end; |
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88 chain = chain->next; |
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89 } |
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90 |
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91 ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
501 | 92 "readv: %d, last:%d", vec.nelts, iov->iov_len); |
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93 |
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94 do { |
501 | 95 n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); |
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96 |
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97 if (n >= 0) { |
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98 |
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99 #if (NGX_HAVE_KQUEUE) |
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100 |
455 | 101 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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102 rev->available -= n; |
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103 |
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104 /* |
587 | 105 * rev->available may be negative here because some additional |
106 * bytes may be received between kevent() and recv() | |
188
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107 */ |
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108 |
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109 if (rev->available <= 0) { |
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110 if (!rev->pending_eof) { |
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111 rev->ready = 0; |
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112 } |
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113 |
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114 if (rev->available < 0) { |
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115 rev->available = 0; |
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116 } |
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117 } |
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118 |
605 | 119 if (n == 0) { |
120 | |
121 /* | |
122 * on FreeBSD recv() may return 0 on closed socket | |
123 * even if kqueue reported about available data | |
124 */ | |
125 | |
627 | 126 #if 0 |
605 | 127 ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
609 | 128 "readv() returned 0 while kevent() reported " |
605 | 129 "%d available bytes", rev->available); |
627 | 130 #endif |
605 | 131 |
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132 rev->ready = 0; |
605 | 133 rev->eof = 1; |
134 rev->available = 0; | |
135 } | |
136 | |
188
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137 return n; |
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138 } |
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139 |
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Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
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140 #endif /* NGX_HAVE_KQUEUE */ |
43512a33e8f2
Merged implementations of ngx_readv_chain().
Valentin Bartenev <vbart@nginx.com>
parents:
5776
diff
changeset
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141 |
5267
13c006f0c40e
Events: honor NGX_USE_GREEDY_EVENT when kqueue support is enabled.
Valentin Bartenev <vbart@nginx.com>
parents:
4597
diff
changeset
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142 if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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143 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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144 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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145 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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146 if (n == 0) { |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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147 rev->eof = 1; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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148 } |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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149 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
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150 return n; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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151 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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152 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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153 err = ngx_socket_errno; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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154 |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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155 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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156 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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157 "readv() not ready"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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158 n = NGX_AGAIN; |
188
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nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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159 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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160 } else { |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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161 n = ngx_connection_error(c, err, "readv() failed"); |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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162 break; |
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
changeset
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163 } |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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164 |
257
70e1c7d2b83d
nginx-0.0.2-2004-02-11-20:08:49 import
Igor Sysoev <igor@sysoev.ru>
parents:
188
diff
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165 } while (err == NGX_EINTR); |
188
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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166 |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
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167 rev->ready = 0; |
0061d1f0908d
nginx-0.0.1-2003-11-18-11:04:34 import
Igor Sysoev <igor@sysoev.ru>
parents:
164
diff
changeset
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168 |
3642 | 169 if (n == NGX_ERROR) { |
164
84036764e215
nginx-0.0.1-2003-10-29-11:30:44 import
Igor Sysoev <igor@sysoev.ru>
parents:
163
diff
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170 c->read->error = 1; |
73
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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171 } |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
changeset
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172 |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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173 return n; |
4534060fde92
nginx-0.0.1-2003-04-10-19:08:54 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff
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174 } |