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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 <sys/resource.h>
29 #include <unistd.h>
30 
31 static void connection_cb(uv_stream_t* server_handle, int status);
32 static void connect_cb(uv_connect_t* req, int status);
33 
34 static const int maxfd = 31;
35 static unsigned connect_cb_called;
36 static uv_tcp_t server_handle;
37 static uv_tcp_t client_handle;
38 
39 
TEST_IMPL(emfile)40 TEST_IMPL(emfile) {
41   struct sockaddr_in addr;
42   struct rlimit limits;
43   uv_connect_t connect_req;
44   uv_loop_t* loop;
45   int first_fd;
46 #if defined(_AIX) || defined(__MVS__)
47   /* On AIX, if a 'accept' call fails ECONNRESET is set on the socket
48    * which causes uv__emfile_trick to not work as intended and this test
49    * to fail.
50    */
51   RETURN_SKIP("uv__emfile_trick does not work on this OS");
52 #endif
53 
54   /* Lower the file descriptor limit and use up all fds save one. */
55   limits.rlim_cur = limits.rlim_max = maxfd + 1;
56   if (setrlimit(RLIMIT_NOFILE, &limits)) {
57     ASSERT(errno == EPERM);  /* Valgrind blocks the setrlimit() call. */
58     RETURN_SKIP("setrlimit(RLIMIT_NOFILE) failed, running under valgrind?");
59   }
60 
61   loop = uv_default_loop();
62   ASSERT(0 == uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
63   ASSERT(0 == uv_tcp_init(loop, &server_handle));
64   ASSERT(0 == uv_tcp_init(loop, &client_handle));
65   ASSERT(0 == uv_tcp_bind(&server_handle, (const struct sockaddr*) &addr, 0));
66   ASSERT(0 == uv_listen((uv_stream_t*) &server_handle, 8, connection_cb));
67 
68   /* Remember the first one so we can clean up afterwards. */
69   do
70     first_fd = dup(0);
71   while (first_fd == -1 && errno == EINTR);
72   ASSERT(first_fd > 0);
73 
74   while (dup(0) != -1 || errno == EINTR);
75   ASSERT(errno == EMFILE);
76   close(maxfd);
77 
78   /* Now connect and use up the last available file descriptor.  The EMFILE
79    * handling logic in src/unix/stream.c should ensure that connect_cb() runs
80    * whereas connection_cb() should *not* run.
81    */
82   ASSERT(0 == uv_tcp_connect(&connect_req,
83                              &client_handle,
84                              (const struct sockaddr*) &addr,
85                              connect_cb));
86   ASSERT(0 == uv_run(loop, UV_RUN_DEFAULT));
87   ASSERT(1 == connect_cb_called);
88 
89   /* Close the dups again. Ignore errors in the unlikely event that the
90    * file descriptors were not contiguous.
91    */
92   while (first_fd < maxfd) {
93     close(first_fd);
94     first_fd += 1;
95   }
96 
97   MAKE_VALGRIND_HAPPY();
98   return 0;
99 }
100 
101 
connection_cb(uv_stream_t * server_handle,int status)102 static void connection_cb(uv_stream_t* server_handle, int status) {
103   ASSERT(0 && "connection_cb should not be called.");
104 }
105 
106 
connect_cb(uv_connect_t * req,int status)107 static void connect_cb(uv_connect_t* req, int status) {
108   /* |status| should equal 0 because the connection should have been accepted,
109    * it's just that the server immediately closes it again.
110    */
111   ASSERT(0 == status);
112   connect_cb_called += 1;
113   uv_close((uv_handle_t*) &server_handle, NULL);
114   uv_close((uv_handle_t*) &client_handle, NULL);
115 }
116 
117 #else
118 
119 typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
120 
121 #endif /* !_WIN32 */
122