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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 #include "uv.h"
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23 #include "internal.h"
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24
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25 #include <unistd.h>
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26 #include <assert.h>
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27
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28
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29 static void uv__poll_io(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
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30 uv_poll_t* handle;
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31 int pevents;
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32
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33 handle = container_of(w, uv_poll_t, io_watcher);
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34
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35 /*
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36 * As documented in the kernel source fs/kernfs/file.c #780
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37 * poll will return POLLERR|POLLPRI in case of sysfs
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38 * polling. This does not happen in case of out-of-band
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39 * TCP messages.
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40 *
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41 * The above is the case on (at least) FreeBSD and Linux.
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42 *
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43 * So to properly determine a POLLPRI or a POLLERR we need
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44 * to check for both.
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45 */
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46 if ((events & POLLERR) && !(events & UV__POLLPRI)) {
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47 uv__io_stop(loop, w, POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
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48 uv__handle_stop(handle);
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49 handle->poll_cb(handle, UV_EBADF, 0);
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50 return;
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51 }
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52
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53 pevents = 0;
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54 if (events & POLLIN)
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55 pevents |= UV_READABLE;
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56 if (events & UV__POLLPRI)
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57 pevents |= UV_PRIORITIZED;
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58 if (events & POLLOUT)
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59 pevents |= UV_WRITABLE;
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60 if (events & UV__POLLRDHUP)
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61 pevents |= UV_DISCONNECT;
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62
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63 handle->poll_cb(handle, 0, pevents);
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64 }
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65
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66
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67 int uv_poll_init(uv_loop_t* loop, uv_poll_t* handle, int fd) {
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68 int err;
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69
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70 if (uv__fd_exists(loop, fd))
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71 return UV_EEXIST;
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72
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73 err = uv__io_check_fd(loop, fd);
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74 if (err)
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75 return err;
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76
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77 /* If ioctl(FIONBIO) reports ENOTTY, try fcntl(F_GETFL) + fcntl(F_SETFL).
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78 * Workaround for e.g. kqueue fds not supporting ioctls.
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79 */
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80 err = uv__nonblock(fd, 1);
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81 #if UV__NONBLOCK_IS_IOCTL
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82 if (err == UV_ENOTTY)
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83 err = uv__nonblock_fcntl(fd, 1);
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84 #endif
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85
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86 if (err)
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87 return err;
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88
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89 uv__handle_init(loop, (uv_handle_t*) handle, UV_POLL);
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90 uv__io_init(&handle->io_watcher, uv__poll_io, fd);
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91 handle->poll_cb = NULL;
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92 return 0;
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93 }
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94
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95
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96 int uv_poll_init_socket(uv_loop_t* loop, uv_poll_t* handle,
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97 uv_os_sock_t socket) {
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98 return uv_poll_init(loop, handle, socket);
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99 }
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100
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101
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102 static void uv__poll_stop(uv_poll_t* handle) {
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103 uv__io_stop(handle->loop,
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104 &handle->io_watcher,
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105 POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
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106 uv__handle_stop(handle);
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107 uv__platform_invalidate_fd(handle->loop, handle->io_watcher.fd);
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108 }
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109
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110
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111 int uv_poll_stop(uv_poll_t* handle) {
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112 assert(!uv__is_closing(handle));
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113 uv__poll_stop(handle);
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114 return 0;
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115 }
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116
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117
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118 int uv_poll_start(uv_poll_t* handle, int pevents, uv_poll_cb poll_cb) {
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119 uv__io_t** watchers;
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120 uv__io_t* w;
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121 int events;
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122
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123 assert((pevents & ~(UV_READABLE | UV_WRITABLE | UV_DISCONNECT |
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124 UV_PRIORITIZED)) == 0);
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125 assert(!uv__is_closing(handle));
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126
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127 watchers = handle->loop->watchers;
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128 w = &handle->io_watcher;
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129
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130 if (uv__fd_exists(handle->loop, w->fd))
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131 if (watchers[w->fd] != w)
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132 return UV_EEXIST;
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133
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134 uv__poll_stop(handle);
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135
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136 if (pevents == 0)
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137 return 0;
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138
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139 events = 0;
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140 if (pevents & UV_READABLE)
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141 events |= POLLIN;
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142 if (pevents & UV_PRIORITIZED)
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143 events |= UV__POLLPRI;
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144 if (pevents & UV_WRITABLE)
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145 events |= POLLOUT;
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146 if (pevents & UV_DISCONNECT)
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147 events |= UV__POLLRDHUP;
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148
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149 uv__io_start(handle->loop, &handle->io_watcher, events);
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150 uv__handle_start(handle);
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151 handle->poll_cb = poll_cb;
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152
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153 return 0;
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154 }
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155
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156
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157 void uv__poll_close(uv_poll_t* handle) {
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158 uv__poll_stop(handle);
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159 }
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