0
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_event.h>
|
|
10
|
|
11
|
146
|
12 #if (IOV_MAX > 64)
|
|
13 #define NGX_IOVS 64
|
|
14 #else
|
|
15 #define NGX_IOVS IOV_MAX
|
|
16 #endif
|
0
|
17
|
|
18
|
50
|
19 ngx_chain_t *
|
|
20 ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
|
0
|
21 {
|
|
22 u_char *prev;
|
10
|
23 ssize_t n, size, sent;
|
22
|
24 off_t send, prev_send;
|
0
|
25 ngx_uint_t eintr, complete;
|
|
26 ngx_err_t err;
|
|
27 ngx_array_t vec;
|
|
28 ngx_chain_t *cl;
|
|
29 ngx_event_t *wev;
|
|
30 struct iovec *iov, iovs[NGX_IOVS];
|
|
31
|
|
32 wev = c->write;
|
|
33
|
|
34 if (!wev->ready) {
|
|
35 return in;
|
|
36 }
|
|
37
|
18
|
38 #if (NGX_HAVE_KQUEUE)
|
0
|
39
|
136
|
40 if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && wev->pending_eof) {
|
86
|
41 (void) ngx_connection_error(c, wev->kq_errno,
|
|
42 "kevent() reported about an closed connection");
|
0
|
43 wev->error = 1;
|
|
44 return NGX_CHAIN_ERROR;
|
|
45 }
|
|
46
|
|
47 #endif
|
|
48
|
22
|
49 /* the maximum limit size is the maximum size_t value - the page size */
|
|
50
|
324
|
51 if (limit == 0 || limit > (off_t) (NGX_MAX_SIZE_T_VALUE - ngx_pagesize)) {
|
26
|
52 limit = NGX_MAX_SIZE_T_VALUE - ngx_pagesize;
|
22
|
53 }
|
|
54
|
0
|
55 send = 0;
|
|
56 complete = 0;
|
|
57
|
|
58 vec.elts = iovs;
|
|
59 vec.size = sizeof(struct iovec);
|
|
60 vec.nalloc = NGX_IOVS;
|
|
61 vec.pool = c->pool;
|
|
62
|
|
63 for ( ;; ) {
|
|
64 prev = NULL;
|
|
65 iov = NULL;
|
|
66 eintr = 0;
|
22
|
67 prev_send = send;
|
0
|
68
|
|
69 vec.nelts = 0;
|
|
70
|
|
71 /* create the iovec and coalesce the neighbouring bufs */
|
|
72
|
|
73 for (cl = in; cl && vec.nelts < IOV_MAX && send < limit; cl = cl->next)
|
|
74 {
|
|
75 if (ngx_buf_special(cl->buf)) {
|
|
76 continue;
|
|
77 }
|
|
78
|
10
|
79 #if 1
|
|
80 if (!ngx_buf_in_memory(cl->buf)) {
|
|
81 ngx_debug_point();
|
|
82 }
|
|
83 #endif
|
|
84
|
0
|
85 size = cl->buf->last - cl->buf->pos;
|
|
86
|
|
87 if (send + size > limit) {
|
110
|
88 size = (ssize_t) (limit - send);
|
0
|
89 }
|
|
90
|
|
91 if (prev == cl->buf->pos) {
|
|
92 iov->iov_len += size;
|
|
93
|
|
94 } else {
|
50
|
95 iov = ngx_array_push(&vec);
|
|
96 if (iov == NULL) {
|
0
|
97 return NGX_CHAIN_ERROR;
|
|
98 }
|
|
99
|
|
100 iov->iov_base = (void *) cl->buf->pos;
|
|
101 iov->iov_len = size;
|
|
102 }
|
|
103
|
|
104 prev = cl->buf->pos + size;
|
|
105 send += size;
|
|
106 }
|
|
107
|
|
108 n = writev(c->fd, vec.elts, vec.nelts);
|
|
109
|
|
110 if (n == -1) {
|
|
111 err = ngx_errno;
|
|
112
|
520
|
113 switch (err) {
|
|
114 case NGX_EAGAIN:
|
|
115 break;
|
0
|
116
|
520
|
117 case NGX_EINTR:
|
|
118 eintr = 1;
|
|
119 break;
|
0
|
120
|
520
|
121 default:
|
0
|
122 wev->error = 1;
|
86
|
123 (void) ngx_connection_error(c, err, "writev() failed");
|
0
|
124 return NGX_CHAIN_ERROR;
|
|
125 }
|
520
|
126
|
|
127 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
|
|
128 "writev() not ready");
|
0
|
129 }
|
|
130
|
|
131 sent = n > 0 ? n : 0;
|
|
132
|
10
|
133 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %z", sent);
|
0
|
134
|
22
|
135 if (send - prev_send == sent) {
|
0
|
136 complete = 1;
|
|
137 }
|
|
138
|
|
139 c->sent += sent;
|
|
140
|
10
|
141 for (cl = in; cl; cl = cl->next) {
|
|
142
|
0
|
143 if (ngx_buf_special(cl->buf)) {
|
|
144 continue;
|
|
145 }
|
|
146
|
|
147 if (sent == 0) {
|
|
148 break;
|
|
149 }
|
|
150
|
|
151 size = cl->buf->last - cl->buf->pos;
|
|
152
|
|
153 if (sent >= size) {
|
|
154 sent -= size;
|
|
155 cl->buf->pos = cl->buf->last;
|
|
156
|
|
157 continue;
|
|
158 }
|
|
159
|
|
160 cl->buf->pos += sent;
|
|
161
|
|
162 break;
|
|
163 }
|
|
164
|
|
165 if (eintr) {
|
|
166 continue;
|
|
167 }
|
|
168
|
|
169 if (!complete) {
|
|
170 wev->ready = 0;
|
|
171 return cl;
|
|
172 }
|
|
173
|
|
174 if (send >= limit || cl == NULL) {
|
|
175 return cl;
|
|
176 }
|
|
177
|
|
178 in = cl;
|
|
179 }
|
|
180 }
|