1 /* $OpenBSD: imsg.c,v 1.6 2004/09/16 01:10:05 henning Exp $ */
4 * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
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.
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 MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 #include <sys/types.h>
29 imsg_init(struct imsgbuf *ibuf, int fd)
31 msgbuf_init(&ibuf->w);
32 bzero(&ibuf->r, sizeof(ibuf->r));
39 imsg_read(struct imsgbuf *ibuf)
43 if ((n = read(ibuf->fd, ibuf->r.buf + ibuf->r.wpos,
44 sizeof(ibuf->r.buf) - ibuf->r.wpos)) == -1) {
45 if (errno != EINTR && errno != EAGAIN) {
46 log_warn("imsg_read: pipe read error");
58 imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
65 if (IMSG_HEADER_SIZE > av)
68 memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
69 if (imsg->hdr.len < IMSG_HEADER_SIZE ||
70 imsg->hdr.len > MAX_IMSGSIZE) {
71 log_warnx("imsg_get: imsg hdr len out of bounds");
74 if (imsg->hdr.len > av)
76 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
77 ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
78 if ((imsg->data = malloc(datalen)) == NULL) {
82 memcpy(imsg->data, ibuf->r.rptr, datalen);
84 if (imsg->hdr.len < av) {
85 left = av - imsg->hdr.len;
86 memcpy(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
91 return (datalen + IMSG_HEADER_SIZE);
95 imsg_compose(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
96 pid_t pid, void *data, u_int16_t datalen)
101 if ((wbuf = imsg_create(ibuf, type, peerid, pid, datalen)) == NULL)
104 if (imsg_add(wbuf, data, datalen) == -1)
107 if ((n = imsg_close(ibuf, wbuf)) < 0)
114 imsg_create(struct imsgbuf *ibuf, enum imsg_type type, u_int32_t peerid,
115 pid_t pid, u_int16_t datalen)
120 if (datalen > MAX_IMSGSIZE - IMSG_HEADER_SIZE) {
121 log_warnx("imsg_create: len %u > MAX_IMSGSIZE; "
122 "type %u peerid %lu", datalen + IMSG_HEADER_SIZE,
127 hdr.len = datalen + IMSG_HEADER_SIZE;
131 if ((wbuf = buf_open(hdr.len)) == NULL) {
132 log_warn("imsg_create: buf_open");
135 if (imsg_add(wbuf, &hdr, sizeof(hdr)) == -1)
142 imsg_add(struct buf *msg, void *data, u_int16_t datalen)
145 if (buf_add(msg, data, datalen) == -1) {
146 log_warnx("imsg_add: buf_add error");
154 imsg_close(struct imsgbuf *ibuf, struct buf *msg)
158 if ((n = buf_close(&ibuf->w, msg)) < 0) {
159 log_warnx("imsg_close: buf_add error");
167 imsg_free(struct imsg *imsg)