1 /* $OpenBSD: imsg.c,v 1.1 2004/05/31 13:46:16 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>
28 int imsg_compose_core(struct imsgbuf *, int, u_int32_t, void *,
30 struct buf *imsg_create_core(struct imsgbuf *, int, u_int32_t, u_int16_t,
34 imsg_init(struct imsgbuf *ibuf, int fd)
36 msgbuf_init(&ibuf->w);
37 bzero(&ibuf->r, sizeof(ibuf->r));
44 imsg_read(struct imsgbuf *ibuf)
48 if ((n = read(ibuf->fd, ibuf->r.buf + ibuf->r.wpos,
49 sizeof(ibuf->r.buf) - ibuf->r.wpos)) == -1) {
50 if (errno != EINTR && errno != EAGAIN) {
51 log_warn("imsg_read: pipe read error");
63 imsg_get(struct imsgbuf *ibuf, struct imsg *imsg)
70 if (IMSG_HEADER_SIZE > av)
73 memcpy(&imsg->hdr, ibuf->r.buf, sizeof(imsg->hdr));
74 if (imsg->hdr.len < IMSG_HEADER_SIZE ||
75 imsg->hdr.len > MAX_IMSGSIZE) {
76 log_warnx("imsg_get: imsg hdr len out of bounds");
79 if (imsg->hdr.len > av)
81 datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
82 ibuf->r.rptr = ibuf->r.buf + IMSG_HEADER_SIZE;
83 if ((imsg->data = malloc(datalen)) == NULL) {
87 memcpy(imsg->data, ibuf->r.rptr, datalen);
89 if (imsg->hdr.len < av) {
90 left = av - imsg->hdr.len;
91 memcpy(&ibuf->r.buf, ibuf->r.buf + imsg->hdr.len, left);
96 return (datalen + IMSG_HEADER_SIZE);
100 imsg_compose(struct imsgbuf *ibuf, int type, u_int32_t peerid, void *data,
103 return (imsg_compose_core(ibuf, type, peerid, data, dlen, ibuf->pid));
107 imsg_compose_pid(struct imsgbuf *ibuf, int type, pid_t pid, void *data,
110 return (imsg_compose_core(ibuf, type, 0, data, datalen, pid));
114 imsg_compose_core(struct imsgbuf *ibuf, int type, u_int32_t peerid, void *data,
115 u_int16_t datalen, pid_t pid)
121 hdr.len = datalen + IMSG_HEADER_SIZE;
125 wbuf = buf_open(hdr.len);
127 log_warn("imsg_compose: buf_open");
130 if (buf_add(wbuf, &hdr, sizeof(hdr)) == -1) {
131 log_warnx("imsg_compose: buf_add error");
136 if (buf_add(wbuf, data, datalen) == -1) {
137 log_warnx("imsg_compose: buf_add error");
142 if ((n = buf_close(&ibuf->w, wbuf)) < 0) {
143 log_warnx("imsg_compose: buf_add error");
151 imsg_create(struct imsgbuf *ibuf, int type, u_int32_t peerid, u_int16_t dlen)
153 return (imsg_create_core(ibuf, type, peerid, dlen, ibuf->pid));
157 imsg_create_pid(struct imsgbuf *ibuf, int type, pid_t pid, u_int16_t datalen)
159 return (imsg_create_core(ibuf, type, 0, datalen, pid));
163 imsg_create_core(struct imsgbuf *ibuf, int type, u_int32_t peerid,
164 u_int16_t datalen, pid_t pid)
169 hdr.len = datalen + IMSG_HEADER_SIZE;
173 wbuf = buf_open(hdr.len);
175 log_warn("imsg_create: buf_open");
178 if (buf_add(wbuf, &hdr, sizeof(hdr)) == -1) {
179 log_warnx("imsg_create: buf_add error");
187 imsg_add(struct buf *msg, void *data, u_int16_t datalen)
190 if (buf_add(msg, data, datalen) == -1) {
191 log_warnx("imsg_add: buf_add error");
199 imsg_close(struct imsgbuf *ibuf, struct buf *msg)
203 if ((n = buf_close(&ibuf->w, msg)) < 0) {
204 log_warnx("imsg_close: buf_add error");
212 imsg_free(struct imsg *imsg)