Annotation of embedaddon/nginx/src/os/unix/ngx_recv.c, revision 1.1.1.1
1.1 misho 1:
2: /*
3: * Copyright (C) Igor Sysoev
4: * Copyright (C) Nginx, Inc.
5: */
6:
7:
8: #include <ngx_config.h>
9: #include <ngx_core.h>
10: #include <ngx_event.h>
11:
12:
13: #if (NGX_HAVE_KQUEUE)
14:
15: ssize_t
16: ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size)
17: {
18: ssize_t n;
19: ngx_err_t err;
20: ngx_event_t *rev;
21:
22: rev = c->read;
23:
24: if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
25: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
26: "recv: eof:%d, avail:%d, err:%d",
27: rev->pending_eof, rev->available, rev->kq_errno);
28:
29: if (rev->available == 0) {
30: if (rev->pending_eof) {
31: rev->ready = 0;
32: rev->eof = 1;
33:
34: if (rev->kq_errno) {
35: rev->error = 1;
36: ngx_set_socket_errno(rev->kq_errno);
37:
38: return ngx_connection_error(c, rev->kq_errno,
39: "kevent() reported about an closed connection");
40: }
41:
42: return 0;
43:
44: } else {
45: rev->ready = 0;
46: return NGX_AGAIN;
47: }
48: }
49: }
50:
51: do {
52: n = recv(c->fd, buf, size, 0);
53:
54: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
55: "recv: fd:%d %d of %d", c->fd, n, size);
56:
57: if (n >= 0) {
58: if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
59: rev->available -= n;
60:
61: /*
62: * rev->available may be negative here because some additional
63: * bytes may be received between kevent() and recv()
64: */
65:
66: if (rev->available <= 0) {
67: if (!rev->pending_eof) {
68: rev->ready = 0;
69: }
70:
71: if (rev->available < 0) {
72: rev->available = 0;
73: }
74: }
75:
76: if (n == 0) {
77:
78: /*
79: * on FreeBSD recv() may return 0 on closed socket
80: * even if kqueue reported about available data
81: */
82:
83: rev->eof = 1;
84: rev->available = 0;
85: }
86:
87: return n;
88: }
89:
90: if ((size_t) n < size) {
91: rev->ready = 0;
92: }
93:
94: if (n == 0) {
95: rev->eof = 1;
96: }
97:
98: return n;
99: }
100:
101: err = ngx_socket_errno;
102:
103: if (err == NGX_EAGAIN || err == NGX_EINTR) {
104: ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
105: "recv() not ready");
106: n = NGX_AGAIN;
107:
108: } else {
109: n = ngx_connection_error(c, err, "recv() failed");
110: break;
111: }
112:
113: } while (err == NGX_EINTR);
114:
115: rev->ready = 0;
116:
117: if (n == NGX_ERROR) {
118: rev->error = 1;
119: }
120:
121: return n;
122: }
123:
124: #else /* ! NGX_HAVE_KQUEUE */
125:
126: ssize_t
127: ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size)
128: {
129: ssize_t n;
130: ngx_err_t err;
131: ngx_event_t *rev;
132:
133: rev = c->read;
134:
135: do {
136: n = recv(c->fd, buf, size, 0);
137:
138: ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
139: "recv: fd:%d %d of %d", c->fd, n, size);
140:
141: if (n == 0) {
142: rev->ready = 0;
143: rev->eof = 1;
144: return n;
145:
146: } else if (n > 0) {
147:
148: if ((size_t) n < size
149: && !(ngx_event_flags & NGX_USE_GREEDY_EVENT))
150: {
151: rev->ready = 0;
152: }
153:
154: return n;
155: }
156:
157: err = ngx_socket_errno;
158:
159: if (err == NGX_EAGAIN || err == NGX_EINTR) {
160: ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err,
161: "recv() not ready");
162: n = NGX_AGAIN;
163:
164: } else {
165: n = ngx_connection_error(c, err, "recv() failed");
166: break;
167: }
168:
169: } while (err == NGX_EINTR);
170:
171: rev->ready = 0;
172:
173: if (n == NGX_ERROR) {
174: rev->error = 1;
175: }
176:
177: return n;
178: }
179:
180: #endif /* NGX_HAVE_KQUEUE */
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