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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #if !defined(_WIN32)
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23
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24 #include "uv.h"
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25 #include "task.h"
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26
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27 #include <errno.h>
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28 #include <sys/resource.h>
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29 #include <unistd.h>
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30
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31 static void connection_cb(uv_stream_t* server_handle, int status);
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32 static void connect_cb(uv_connect_t* req, int status);
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33
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34 static const int maxfd = 31;
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35 static unsigned connect_cb_called;
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36 static uv_tcp_t server_handle;
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37 static uv_tcp_t client_handle;
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38
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39
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40 TEST_IMPL(emfile) {
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41 struct sockaddr_in addr;
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42 struct rlimit limits;
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43 uv_connect_t connect_req;
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44 uv_loop_t* loop;
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45 int first_fd;
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46 #if defined(_AIX) || defined(__MVS__)
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47 /* On AIX, if a 'accept' call fails ECONNRESET is set on the socket
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48 * which causes uv__emfile_trick to not work as intended and this test
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49 * to fail.
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50 */
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51 RETURN_SKIP("uv__emfile_trick does not work on this OS");
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52 #endif
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53
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54 /* Lower the file descriptor limit and use up all fds save one. */
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55 limits.rlim_cur = limits.rlim_max = maxfd + 1;
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56 if (setrlimit(RLIMIT_NOFILE, &limits)) {
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57 ASSERT_EQ(errno, EPERM); /* Valgrind blocks the setrlimit() call. */
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58 RETURN_SKIP("setrlimit(RLIMIT_NOFILE) failed, running under valgrind?");
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59 }
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60
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61 loop = uv_default_loop();
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62 ASSERT_OK(uv_ip4_addr("127.0.0.1", TEST_PORT, &addr));
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63 ASSERT_OK(uv_tcp_init(loop, &server_handle));
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64 ASSERT_OK(uv_tcp_init(loop, &client_handle));
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65 ASSERT_OK(uv_tcp_bind(&server_handle, (const struct sockaddr*) &addr, 0));
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66 ASSERT_OK(uv_listen((uv_stream_t*) &server_handle, 8, connection_cb));
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67
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68 /* Remember the first one so we can clean up afterwards. */
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69 do
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70 first_fd = dup(0);
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71 while (first_fd == -1 && errno == EINTR);
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72 ASSERT_GT(first_fd, 0);
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73
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74 while (dup(0) != -1 || errno == EINTR);
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75 ASSERT_EQ(errno, EMFILE);
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76 close(maxfd);
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77
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78 #if defined(__ANDROID__)
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79 /* Android connect syscall requires an extra file descriptor
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80 *
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81 * It fails in uv__tcp_connect
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82 * */
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83 close(maxfd - 1);
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84 #endif
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85
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86 /* Now connect and use up the last available file descriptor. The EMFILE
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87 * handling logic in src/unix/stream.c should ensure that connect_cb() runs
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88 * whereas connection_cb() should *not* run.
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89 */
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90 ASSERT_OK(uv_tcp_connect(&connect_req,
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91 &client_handle,
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92 (const struct sockaddr*) &addr,
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93 connect_cb));
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94 ASSERT_OK(uv_run(loop, UV_RUN_DEFAULT));
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95 ASSERT_EQ(1, connect_cb_called);
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96
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97 /* Close the dups again. Ignore errors in the unlikely event that the
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98 * file descriptors were not contiguous.
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99 */
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100 while (first_fd < maxfd) {
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101 close(first_fd);
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102 first_fd += 1;
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103 }
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104
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105 MAKE_VALGRIND_HAPPY(loop);
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106 return 0;
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107 }
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108
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109
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110 static void connection_cb(uv_stream_t* server_handle, int status) {
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111 ASSERT(0 && "connection_cb should not be called.");
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112 }
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113
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114
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115 static void connect_cb(uv_connect_t* req, int status) {
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116 /* |status| should equal 0 because the connection should have been accepted,
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117 * it's just that the server immediately closes it again.
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118 */
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119 ASSERT_OK(status);
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120 connect_cb_called += 1;
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121 uv_close((uv_handle_t*) &server_handle, NULL);
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122 uv_close((uv_handle_t*) &client_handle, NULL);
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123 }
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124
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125 #else
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126
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127 typedef int file_has_no_tests; /* ISO C forbids an empty translation unit. */
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128
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129 #endif /* !_WIN32 */
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