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
|
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_freebsd_init.h>
/*
sendfile() often sends 4K pages over ethernet in 3 packets: 2x1460 and 1176
or in 6 packets: 5x1460 and 892. Besides although sendfile() allows
to pass the header and the trailer it never sends the header or the trailer
with the part of the file in one packet. So we use TCP_NOPUSH (similar
to Linux's TCP_CORK) to postpone the sending - it not only sends the header
and the first part of the file in one packet but also sends 4K pages
in the full packets.
Until FreeBSD 4.5 the turning TCP_NOPUSH off does not not flush
the pending data that less than MSS and the data sent with 5 second delay.
So we use TCP_NOPUSH on FreeBSD 4.5+ only.
*/
ngx_chain_t *ngx_freebsd_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in)
{
int rc, eintr, tcp_nopush;
char *prev;
size_t hsize, size;
off_t sent;
struct iovec *iov;
struct sf_hdtr hdtr;
ngx_err_t err;
ngx_array_t header, trailer;
ngx_hunk_t *file;
ngx_chain_t *ce, *tail;
tcp_nopush = 0;
do {
ce = in;
file = NULL;
hsize = 0;
eintr = 0;
ngx_init_array(header, c->pool, 10, sizeof(struct iovec),
NGX_CHAIN_ERROR);
ngx_init_array(trailer, c->pool, 10, sizeof(struct iovec),
NGX_CHAIN_ERROR);
/* create the header iovec */
if (ngx_hunk_in_memory_only(ce->hunk)) {
prev = NULL;
iov = NULL;
/* create the iovec and coalesce the neighbouring chain entries */
while (ce && ngx_hunk_in_memory_only(ce->hunk)) {
if (prev == ce->hunk->pos) {
iov->iov_len += ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
} else {
ngx_test_null(iov, ngx_push_array(&header),
NGX_CHAIN_ERROR);
iov->iov_base = ce->hunk->pos;
iov->iov_len = ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
}
hsize += ce->hunk->last - ce->hunk->pos;
ce = ce->next;
}
}
/* TODO: coalesce the neighbouring file hunks */
if (ce && (ce->hunk->type & NGX_HUNK_FILE)) {
file = ce->hunk;
ce = ce->next;
}
/* create the trailer iovec */
if (ce && ngx_hunk_in_memory_only(ce->hunk)) {
prev = NULL;
iov = NULL;
/* create the iovec and coalesce the neighbouring chain entries */
while (ce && ngx_hunk_in_memory_only(ce->hunk)) {
if (prev == ce->hunk->pos) {
iov->iov_len += ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
} else {
ngx_test_null(iov, ngx_push_array(&trailer),
NGX_CHAIN_ERROR);
iov->iov_base = ce->hunk->pos;
iov->iov_len = ce->hunk->last - ce->hunk->pos;
prev = ce->hunk->last;
}
ce = ce->next;
}
}
tail = ce;
if (file) {
if (!c->tcp_nopush && c->tcp_nopush_enabled) {
c->tcp_nopush = 1;
tcp_nopush = 1;
if (ngx_tcp_nopush(c->fd) == NGX_ERROR) {
ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno,
ngx_tcp_nopush_n " failed");
return NGX_CHAIN_ERROR;
}
ngx_log_debug(c->log, "NOPUSH");
}
hdtr.headers = (struct iovec *) header.elts;
hdtr.hdr_cnt = header.nelts;
hdtr.trailers = (struct iovec *) trailer.elts;
hdtr.trl_cnt = trailer.nelts;
if (ngx_freebsd_sendfile_nbytes_bug == 0) {
hsize = 0;
}
rc = sendfile(file->file->fd, c->fd, file->file_pos,
(size_t) (file->file_last - file->file_pos) + hsize,
&hdtr, &sent, 0);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EINTR) {
eintr = 1;
}
if (err == NGX_EAGAIN || err == NGX_EINTR) {
ngx_log_error(NGX_LOG_INFO, c->log, err,
"sendfile() sent only %qd bytes", sent);
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err,
"sendfile() failed");
return NGX_CHAIN_ERROR;
}
}
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "sendfile: %d, @%qd %qd:%d" _
rc _ file->file_pos _ sent _
(size_t) (file->file_last - file->file_pos) + hsize);
#endif
} else {
rc = writev(c->fd, (struct iovec *) header.elts, header.nelts);
if (rc == -1) {
err = ngx_errno;
if (err == NGX_EAGAIN) {
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN");
} else if (err == NGX_EINTR) {
eintr = 1;
ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EINTR");
} else {
ngx_log_error(NGX_LOG_CRIT, c->log, err, "writev() failed");
return NGX_CHAIN_ERROR;
}
}
sent = rc > 0 ? rc : 0;
#if (NGX_DEBUG_WRITE_CHAIN)
ngx_log_debug(c->log, "writev: %qd" _ sent);
#endif
}
c->sent += sent;
for (ce = in; ce && sent > 0; ce = ce->next) {
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
size = ce->hunk->last - ce->hunk->pos;
} else {
size = ce->hunk->file_last - ce->hunk->file_pos;
}
if (sent >= size) {
sent -= size;
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
ce->hunk->pos = ce->hunk->last;
}
if (ce->hunk->type & NGX_HUNK_FILE) {
ce->hunk->file_pos = ce->hunk->file_last;
}
continue;
}
if (ce->hunk->type & NGX_HUNK_IN_MEMORY) {
ce->hunk->pos += sent;
}
if (ce->hunk->type & NGX_HUNK_FILE) {
ce->hunk->file_pos += sent;
}
break;
}
ngx_destroy_array(&trailer);
ngx_destroy_array(&header);
in = ce;
} while ((tail && tail == ce) || eintr);
return ce;
}
|
