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1 /* |
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2 * Copyright (c) 2009 Eric Faurot <eric@openbsd.org> |
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3 * |
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4 * Permission to use, copy, modify, and distribute this software for any |
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5 * purpose with or without fee is hereby granted, provided that the above |
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6 * copyright notice and this permission notice appear in all copies. |
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7 * |
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8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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15 */ |
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16 |
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17 #include <sys/param.h> |
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18 #include <sys/queue.h> |
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19 #include <sys/socket.h> |
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20 #include <sys/uio.h> |
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21 |
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22 #include <errno.h> |
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23 #include <stdio.h> |
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24 #include <stdlib.h> |
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25 #include <string.h> |
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26 #include <unistd.h> |
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27 |
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28 #include "imsgev.h" |
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29 |
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30 void imsgev_add(struct imsgev *); |
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31 void imsgev_dispatch(int, short, void *); |
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32 void imsgev_disconnect(struct imsgev *, int); |
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33 |
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34 void |
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35 imsgev_init(struct imsgev *iev, int fd, void *data, |
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36 void (*callback)(struct imsgev *, int, struct imsg *), |
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37 void (*needfd)(struct imsgev *)) |
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38 { |
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39 imsg_init(&iev->ibuf, fd); |
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40 iev->terminate = 0; |
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41 |
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42 iev->data = data; |
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43 iev->handler = imsgev_dispatch; |
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44 iev->callback = callback; |
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45 iev->needfd = needfd; |
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46 |
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47 iev->events = EV_READ; |
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48 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
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49 event_add(&iev->ev, NULL); |
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50 } |
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51 |
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52 int |
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53 imsgev_compose(struct imsgev *iev, u_int16_t type, u_int32_t peerid, |
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54 uint32_t pid, int fd, void *data, u_int16_t datalen) |
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55 { |
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56 int r; |
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57 |
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58 r = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen); |
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59 if (r != -1) |
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60 imsgev_add(iev); |
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61 |
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62 return (r); |
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63 } |
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64 |
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65 void |
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66 imsgev_close(struct imsgev *iev) |
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67 { |
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68 iev->terminate = 1; |
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69 imsgev_add(iev); |
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70 } |
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71 |
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72 void |
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73 imsgev_clear(struct imsgev *iev) |
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74 { |
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75 event_del(&iev->ev); |
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76 msgbuf_clear(&iev->ibuf.w); |
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77 close(iev->ibuf.fd); |
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78 } |
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79 |
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80 void |
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81 imsgev_add(struct imsgev *iev) |
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82 { |
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83 short events = 0; |
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84 |
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85 if (!iev->terminate) |
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86 events = EV_READ; |
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87 if (iev->ibuf.w.queued || iev->terminate) |
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88 events |= EV_WRITE; |
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89 |
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90 /* optimization: skip event_{del/set/add} if already set */ |
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91 if (events == iev->events) |
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92 return; |
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93 |
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94 iev->events = events; |
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95 event_del(&iev->ev); |
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96 event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
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97 event_add(&iev->ev, NULL); |
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98 } |
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99 |
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100 void |
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101 imsgev_dispatch(int fd, short ev, void *humppa) |
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102 { |
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103 struct imsgev *iev = humppa; |
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104 struct imsgbuf *ibuf = &iev->ibuf; |
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105 struct imsg imsg; |
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106 ssize_t n; |
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107 |
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108 iev->events = 0; |
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109 |
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110 if (ev & EV_READ) { |
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111 if ((n = imsg_read(ibuf)) == -1) { |
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112 /* if we don't have enough fds, free one up and retry */ |
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113 if (errno == EAGAIN) { |
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114 iev->needfd(iev); |
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115 n = imsg_read(ibuf); |
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116 } |
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117 |
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118 if (n == -1) { |
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119 imsgev_disconnect(iev, IMSGEV_EREAD); |
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120 return; |
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121 } |
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122 } |
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123 if (n == 0) { |
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124 /* |
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125 * Connection is closed for reading, and we assume |
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126 * it is also closed for writing, so we error out |
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127 * if write data is pending. |
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128 */ |
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129 imsgev_disconnect(iev, |
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130 (iev->ibuf.w.queued) ? IMSGEV_EWRITE : IMSGEV_DONE); |
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131 return; |
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132 } |
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133 } |
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134 |
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135 if (ev & EV_WRITE) { |
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136 /* |
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137 * We wanted to write data out but the connection is either |
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138 * closed, or some error occured. Both case are not recoverable |
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139 * from the imsg perspective, so we treat it as a WRITE error. |
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140 */ |
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141 if ((n = msgbuf_write(&ibuf->w)) != 1) { |
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142 imsgev_disconnect(iev, IMSGEV_EWRITE); |
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143 return; |
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144 } |
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145 } |
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146 |
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147 while (iev->terminate == 0) { |
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148 if ((n = imsg_get(ibuf, &imsg)) == -1) { |
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149 imsgev_disconnect(iev, IMSGEV_EIMSG); |
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150 return; |
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151 } |
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152 if (n == 0) |
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153 break; |
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154 iev->callback(iev, IMSGEV_IMSG, &imsg); |
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155 imsg_free(&imsg); |
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156 } |
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157 |
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158 if (iev->terminate && iev->ibuf.w.queued == 0) { |
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159 imsgev_disconnect(iev, IMSGEV_DONE); |
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160 return; |
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161 } |
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162 |
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163 imsgev_add(iev); |
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164 } |
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165 |
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166 void |
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167 imsgev_disconnect(struct imsgev *iev, int code) |
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168 { |
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169 iev->callback(iev, code, NULL); |
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170 } |