| File: | src/usr.sbin/ldapd/imsgev.c |
| Warning: | line 142, column 8 Although the value stored to 'n' is used in the enclosing expression, the value is never actually read from 'n' |
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| 1 | /* $OpenBSD: imsgev.c,v 1.6 2017/03/01 00:53:39 gsoares Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2009 Eric Faurot <eric@openbsd.org> |
| 5 | * |
| 6 | * Permission to use, copy, modify, and distribute this software for any |
| 7 | * purpose with or without fee is hereby granted, provided that the above |
| 8 | * copyright notice and this permission notice appear in all copies. |
| 9 | * |
| 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 17 | */ |
| 18 | |
| 19 | #include <sys/queue.h> |
| 20 | #include <sys/socket.h> |
| 21 | #include <sys/uio.h> |
| 22 | |
| 23 | #include <errno(*__errno()).h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <unistd.h> |
| 28 | |
| 29 | #include "imsgev.h" |
| 30 | |
| 31 | void imsgev_add(struct imsgev *); |
| 32 | void imsgev_dispatch(int, short, void *); |
| 33 | void imsgev_disconnect(struct imsgev *, int); |
| 34 | |
| 35 | void |
| 36 | imsgev_init(struct imsgev *iev, int fd, void *data, |
| 37 | void (*callback)(struct imsgev *, int, struct imsg *), |
| 38 | void (*needfd)(struct imsgev *)) |
| 39 | { |
| 40 | imsg_init(&iev->ibuf, fd); |
| 41 | iev->terminate = 0; |
| 42 | |
| 43 | iev->data = data; |
| 44 | iev->handler = imsgev_dispatch; |
| 45 | iev->callback = callback; |
| 46 | iev->needfd = needfd; |
| 47 | |
| 48 | iev->events = EV_READ0x02; |
| 49 | event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
| 50 | event_add(&iev->ev, NULL((void *)0)); |
| 51 | } |
| 52 | |
| 53 | int |
| 54 | imsgev_compose(struct imsgev *iev, u_int16_t type, u_int32_t peerid, |
| 55 | uint32_t pid, int fd, void *data, u_int16_t datalen) |
| 56 | { |
| 57 | int r; |
| 58 | |
| 59 | r = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen); |
| 60 | if (r != -1) |
| 61 | imsgev_add(iev); |
| 62 | |
| 63 | return (r); |
| 64 | } |
| 65 | |
| 66 | void |
| 67 | imsgev_close(struct imsgev *iev) |
| 68 | { |
| 69 | iev->terminate = 1; |
| 70 | imsgev_add(iev); |
| 71 | } |
| 72 | |
| 73 | void |
| 74 | imsgev_clear(struct imsgev *iev) |
| 75 | { |
| 76 | event_del(&iev->ev); |
| 77 | msgbuf_clear(&iev->ibuf.w); |
| 78 | close(iev->ibuf.fd); |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | imsgev_add(struct imsgev *iev) |
| 83 | { |
| 84 | short events = 0; |
| 85 | |
| 86 | if (!iev->terminate) |
| 87 | events = EV_READ0x02; |
| 88 | if (iev->ibuf.w.queued || iev->terminate) |
| 89 | events |= EV_WRITE0x04; |
| 90 | |
| 91 | /* optimization: skip event_{del/set/add} if already set */ |
| 92 | if (events == iev->events) |
| 93 | return; |
| 94 | |
| 95 | iev->events = events; |
| 96 | event_del(&iev->ev); |
| 97 | event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
| 98 | event_add(&iev->ev, NULL((void *)0)); |
| 99 | } |
| 100 | |
| 101 | void |
| 102 | imsgev_dispatch(int fd, short ev, void *humppa) |
| 103 | { |
| 104 | struct imsgev *iev = humppa; |
| 105 | struct imsgbuf *ibuf = &iev->ibuf; |
| 106 | struct imsg imsg; |
| 107 | ssize_t n; |
| 108 | |
| 109 | iev->events = 0; |
| 110 | |
| 111 | if (ev & EV_READ0x02) { |
| 112 | if ((n = imsg_read(ibuf)) == -1) { |
| 113 | /* if we don't have enough fds, free one up and retry */ |
| 114 | if (errno(*__errno()) == EAGAIN35) { |
| 115 | iev->needfd(iev); |
| 116 | n = imsg_read(ibuf); |
| 117 | } |
| 118 | |
| 119 | if (n == -1) { |
| 120 | imsgev_disconnect(iev, IMSGEV_EREAD2); |
| 121 | return; |
| 122 | } |
| 123 | } |
| 124 | if (n == 0) { |
| 125 | /* |
| 126 | * Connection is closed for reading, and we assume |
| 127 | * it is also closed for writing, so we error out |
| 128 | * if write data is pending. |
| 129 | */ |
| 130 | imsgev_disconnect(iev, |
| 131 | (iev->ibuf.w.queued) ? IMSGEV_EWRITE3 : IMSGEV_DONE1); |
| 132 | return; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | if (ev & EV_WRITE0x04) { |
| 137 | /* |
| 138 | * We wanted to write data out but the connection is either |
| 139 | * closed, or some error occured. Both case are not recoverable |
| 140 | * from the imsg perspective, so we treat it as a WRITE error. |
| 141 | */ |
| 142 | if ((n = msgbuf_write(&ibuf->w)) <= 0 && errno(*__errno()) != EAGAIN35) { |
Although the value stored to 'n' is used in the enclosing expression, the value is never actually read from 'n' | |
| 143 | imsgev_disconnect(iev, IMSGEV_EWRITE3); |
| 144 | return; |
| 145 | } |
| 146 | } |
| 147 | |
| 148 | while (iev->terminate == 0) { |
| 149 | if ((n = imsg_get(ibuf, &imsg)) == -1) { |
| 150 | imsgev_disconnect(iev, IMSGEV_EIMSG4); |
| 151 | return; |
| 152 | } |
| 153 | if (n == 0) |
| 154 | break; |
| 155 | iev->callback(iev, IMSGEV_IMSG0, &imsg); |
| 156 | imsg_free(&imsg); |
| 157 | } |
| 158 | |
| 159 | if (iev->terminate && iev->ibuf.w.queued == 0) { |
| 160 | imsgev_disconnect(iev, IMSGEV_DONE1); |
| 161 | return; |
| 162 | } |
| 163 | |
| 164 | imsgev_add(iev); |
| 165 | } |
| 166 | |
| 167 | void |
| 168 | imsgev_disconnect(struct imsgev *iev, int code) |
| 169 | { |
| 170 | iev->callback(iev, code, NULL((void *)0)); |
| 171 | } |