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
|
/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
ssize_t
ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size)
{
ssize_t n;
ngx_err_t err;
ngx_event_t *rev;
rev = c->read;
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"recv: eof:%d, avail:%d, err:%d",
rev->pending_eof, rev->available, rev->kq_errno);
if (rev->available == 0) {
if (rev->pending_eof) {
rev->ready = 0;
rev->eof = 1;
if (rev->kq_errno) {
rev->error = 1;
ngx_set_socket_errno(rev->kq_errno);
return ngx_connection_error(c, rev->kq_errno,
"kevent() reported about an closed connection");
}
return 0;
} else {
rev->ready = 0;
return NGX_AGAIN;
}
}
}
#endif
#if (NGX_HAVE_EPOLLRDHUP)
if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"recv: eof:%d, avail:%d",
rev->pending_eof, rev->available);
if (!rev->available && !rev->pending_eof) {
rev->ready = 0;
return NGX_AGAIN;
}
}
#endif
do {
n = recv(c->fd, buf, size, 0);
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"recv: fd:%d %z of %uz", c->fd, n, size);
if (n == 0) {
rev->ready = 0;
rev->eof = 1;
#if (NGX_HAVE_KQUEUE)
/*
* on FreeBSD recv() may return 0 on closed socket
* even if kqueue reported about available data
*/
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
rev->available = 0;
}
#endif
return 0;
}
if (n > 0) {
#if (NGX_HAVE_KQUEUE)
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
rev->available -= n;
/*
* rev->available may be negative here because some additional
* bytes may be received between kevent() and recv()
*/
if (rev->available <= 0) {
if (!rev->pending_eof) {
rev->ready = 0;
}
rev->available = 0;
}
return n;
}
#endif
#if (NGX_HAVE_EPOLLRDHUP)
if ((ngx_event_flags & NGX_USE_EPOLL_EVENT)
&& ngx_use_epoll_rdhup)
{
if ((size_t) n < size) {
if (!rev->pending_eof) {
rev->ready = 0;
}
rev->available = 0;
}
return n;
}
#endif
if ((size_t) n < size
&& !(ngx_event_flags & NGX_USE_GREEDY_EVENT))
{
rev->ready = 0;
}
return n;
}
err = ngx_socket_errno;
if (err == NGX_EAGAIN || err == NGX_EINTR) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
"recv() not ready");
n = NGX_AGAIN;
} else {
n = ngx_connection_error(c, err, "recv() failed");
break;
}
} while (err == NGX_EINTR);
rev->ready = 0;
if (n == NGX_ERROR) {
rev->error = 1;
}
return n;
}
|
