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/* |
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* Copyright (c) 2009 Eric Faurot <eric@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <sys/param.h> |
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#include <sys/queue.h> |
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#include <sys/socket.h> |
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#include <sys/uio.h> |
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#include <errno.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "imsgev.h" |
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void imsgev_add(struct imsgev *); |
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void imsgev_dispatch(int, short, void *); |
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void imsgev_disconnect(struct imsgev *, int); |
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void |
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imsgev_init(struct imsgev *iev, int fd, void *data, |
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void (*callback)(struct imsgev *, int, struct imsg *), |
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void (*needfd)(struct imsgev *)) |
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{ |
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imsg_init(&iev->ibuf, fd); |
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iev->terminate = 0; |
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iev->data = data; |
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iev->handler = imsgev_dispatch; |
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iev->callback = callback; |
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iev->needfd = needfd; |
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iev->events = EV_READ; |
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event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
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event_add(&iev->ev, NULL); |
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} |
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int |
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imsgev_compose(struct imsgev *iev, u_int16_t type, u_int32_t peerid, |
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uint32_t pid, int fd, void *data, u_int16_t datalen) |
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{ |
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int r; |
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r = imsg_compose(&iev->ibuf, type, peerid, pid, fd, data, datalen); |
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if (r != -1) |
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imsgev_add(iev); |
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return (r); |
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} |
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void |
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imsgev_close(struct imsgev *iev) |
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{ |
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iev->terminate = 1; |
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imsgev_add(iev); |
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} |
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void |
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imsgev_clear(struct imsgev *iev) |
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{ |
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event_del(&iev->ev); |
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msgbuf_clear(&iev->ibuf.w); |
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close(iev->ibuf.fd); |
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} |
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void |
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imsgev_add(struct imsgev *iev) |
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{ |
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short events = 0; |
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if (!iev->terminate) |
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events = EV_READ; |
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if (iev->ibuf.w.queued || iev->terminate) |
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events |= EV_WRITE; |
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/* optimization: skip event_{del/set/add} if already set */ |
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if (events == iev->events) |
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return; |
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iev->events = events; |
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event_del(&iev->ev); |
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event_set(&iev->ev, iev->ibuf.fd, iev->events, iev->handler, iev); |
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event_add(&iev->ev, NULL); |
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} |
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void |
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imsgev_dispatch(int fd, short ev, void *humppa) |
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{ |
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struct imsgev *iev = humppa; |
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struct imsgbuf *ibuf = &iev->ibuf; |
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struct imsg imsg; |
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ssize_t n; |
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iev->events = 0; |
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if (ev & EV_READ) { |
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if ((n = imsg_read(ibuf)) == -1) { |
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/* if we don't have enough fds, free one up and retry */ |
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if (errno == EAGAIN) { |
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iev->needfd(iev); |
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n = imsg_read(ibuf); |
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} |
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if (n == -1) { |
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imsgev_disconnect(iev, IMSGEV_EREAD); |
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return; |
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} |
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} |
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if (n == 0) { |
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/* |
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* Connection is closed for reading, and we assume |
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* it is also closed for writing, so we error out |
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* if write data is pending. |
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*/ |
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imsgev_disconnect(iev, |
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(iev->ibuf.w.queued) ? IMSGEV_EWRITE : IMSGEV_DONE); |
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return; |
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} |
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} |
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if (ev & EV_WRITE) { |
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/* |
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* We wanted to write data out but the connection is either |
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* closed, or some error occured. Both case are not recoverable |
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* from the imsg perspective, so we treat it as a WRITE error. |
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*/ |
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if ((n = msgbuf_write(&ibuf->w)) != 1) { |
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imsgev_disconnect(iev, IMSGEV_EWRITE); |
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return; |
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} |
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} |
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while (iev->terminate == 0) { |
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if ((n = imsg_get(ibuf, &imsg)) == -1) { |
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imsgev_disconnect(iev, IMSGEV_EIMSG); |
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return; |
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} |
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if (n == 0) |
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break; |
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iev->callback(iev, IMSGEV_IMSG, &imsg); |
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imsg_free(&imsg); |
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} |
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if (iev->terminate && iev->ibuf.w.queued == 0) { |
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imsgev_disconnect(iev, IMSGEV_DONE); |
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return; |
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} |
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imsgev_add(iev); |
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} |
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void |
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imsgev_disconnect(struct imsgev *iev, int code) |
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{ |
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iev->callback(iev, code, NULL); |
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} |