1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
2 *
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
9 *
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
12 *
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
19 * IN THE SOFTWARE.
20 */
21
22 #if !defined(_WIN32)
23
24 #include "uv.h"
25 #include "task.h"
26
27 #include <errno.h>
28 #include <stdio.h>
29 #include <sys/resource.h>
30 #include <unistd.h>
31
32 static void connection_cb(uv_stream_t* server_handle, int status);
33 static void connect_cb(uv_connect_t* req, int status);
34
35 static const int maxfd = 31;
36 static unsigned connect_cb_called;
37 static uv_tcp_t server_handle;
38 static uv_tcp_t client_handle;
39
40
TEST_IMPL(emfile)41 TEST_IMPL(emfile) {
42 struct sockaddr_in addr;
43 struct rlimit limits;
44 uv_connect_t connect_req;
45 uv_loop_t* loop;
46 int first_fd;
47
48 loop = uv_default_loop();
49 ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
50 ASSERT(0 == uv_tcp_init(loop, &server_handle));
51 ASSERT(0 == uv_tcp_init(loop, &client_handle));
52 ASSERT(0 == uv_tcp_bind(&server_handle, (const struct sockaddr*) &addr, 0));
53 ASSERT(0 == uv_listen((uv_stream_t*) &server_handle, 8, connection_cb));
54
55 /* Lower the file descriptor limit and use up all fds save one. */
56 limits.rlim_cur = limits.rlim_max = maxfd + 1;
57 if (setrlimit(RLIMIT_NOFILE, &limits)) {
58 perror("setrlimit(RLIMIT_NOFILE)");
59 ASSERT(0);
60 }
61
62 /* Remember the first one so we can clean up afterwards. */
63 do
64 first_fd = dup(0);
65 while (first_fd == -1 && errno == EINTR);
66 ASSERT(first_fd > 0);
67
68 while (dup(0) != -1 || errno == EINTR);
69 ASSERT(errno == EMFILE);
70 close(maxfd);
71
72 /* Now connect and use up the last available file descriptor. The EMFILE
73 * handling logic in src/unix/stream.c should ensure that connect_cb() runs
74 * whereas connection_cb() should *not* run.
75 */
76 ASSERT(0 == uv_tcp_connect(&connect_req,
77 &client_handle,
78 (const struct sockaddr*) &addr,
79 connect_cb));
80 ASSERT(0 == uv_run(loop, UV_RUN_DEFAULT));
81 ASSERT(1 == connect_cb_called);
82
83 /* Close the dups again. Ignore errors in the unlikely event that the
84 * file descriptors were not contiguous.
85 */
86 while (first_fd < maxfd) {
87 close(first_fd);
88 first_fd += 1;
89 }
90
91 MAKE_VALGRIND_HAPPY();
92 return 0;
93 }
94
95
connection_cb(uv_stream_t * server_handle,int status)96 static void connection_cb(uv_stream_t* server_handle, int status) {
97 ASSERT(0 && "connection_cb should not be called.");
98 }
99
100
connect_cb(uv_connect_t * req,int status)101 static void connect_cb(uv_connect_t* req, int status) {
102 /* |status| should equal 0 because the connection should have been accepted,
103 * it's just that the server immediately closes it again.
104 */
105 ASSERT(0 == status);
106 connect_cb_called += 1;
107 uv_close((uv_handle_t*) &server_handle, NULL);
108 uv_close((uv_handle_t*) &client_handle, NULL);
109 }
110
111 #endif /* !defined(_WIN32) */
112