1 8623abea 2024-01-20 op /* $OpenBSD: imsg-buffer.c,v 1.18 2023/12/12 15:47:41 claudio Exp $ */
4 8623abea 2024-01-20 op * Copyright (c) 2023 Claudio Jeker <claudio@openbsd.org>
5 b0003f58 2021-03-08 op * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
7 b0003f58 2021-03-08 op * Permission to use, copy, modify, and distribute this software for any
8 b0003f58 2021-03-08 op * purpose with or without fee is hereby granted, provided that the above
9 b0003f58 2021-03-08 op * copyright notice and this permission notice appear in all copies.
11 b0003f58 2021-03-08 op * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 b0003f58 2021-03-08 op * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 b0003f58 2021-03-08 op * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 b0003f58 2021-03-08 op * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 b0003f58 2021-03-08 op * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 b0003f58 2021-03-08 op * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 b0003f58 2021-03-08 op * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 a625907c 2021-03-19 op #include "compat.h"
22 b0003f58 2021-03-08 op #include <sys/types.h>
23 b0003f58 2021-03-08 op #include <sys/socket.h>
24 b0003f58 2021-03-08 op #include <sys/uio.h>
26 b0003f58 2021-03-08 op #include <limits.h>
27 b0003f58 2021-03-08 op #include <errno.h>
28 8623abea 2024-01-20 op #include <stdint.h>
29 b0003f58 2021-03-08 op #include <stdlib.h>
30 b0003f58 2021-03-08 op #include <string.h>
31 b0003f58 2021-03-08 op #include <unistd.h>
33 b0003f58 2021-03-08 op #include "imsg.h"
35 b0003f58 2021-03-08 op static int ibuf_realloc(struct ibuf *, size_t);
36 b0003f58 2021-03-08 op static void ibuf_enqueue(struct msgbuf *, struct ibuf *);
37 b0003f58 2021-03-08 op static void ibuf_dequeue(struct msgbuf *, struct ibuf *);
38 ef16f8f6 2023-07-02 op static void msgbuf_drain(struct msgbuf *, size_t);
41 b0003f58 2021-03-08 op ibuf_open(size_t len)
43 b0003f58 2021-03-08 op struct ibuf *buf;
45 ef16f8f6 2023-07-02 op if (len == 0) {
46 ef16f8f6 2023-07-02 op errno = EINVAL;
47 ef16f8f6 2023-07-02 op return (NULL);
49 b0003f58 2021-03-08 op if ((buf = calloc(1, sizeof(struct ibuf))) == NULL)
50 b0003f58 2021-03-08 op return (NULL);
51 ef16f8f6 2023-07-02 op if ((buf->buf = calloc(len, 1)) == NULL) {
53 b0003f58 2021-03-08 op return (NULL);
55 b0003f58 2021-03-08 op buf->size = buf->max = len;
62 b0003f58 2021-03-08 op ibuf_dynamic(size_t len, size_t max)
64 b0003f58 2021-03-08 op struct ibuf *buf;
66 8623abea 2024-01-20 op if (max == 0 || max < len) {
67 ef16f8f6 2023-07-02 op errno = EINVAL;
68 b0003f58 2021-03-08 op return (NULL);
71 ef16f8f6 2023-07-02 op if ((buf = calloc(1, sizeof(struct ibuf))) == NULL)
72 b0003f58 2021-03-08 op return (NULL);
73 ef16f8f6 2023-07-02 op if (len > 0) {
74 ef16f8f6 2023-07-02 op if ((buf->buf = calloc(len, 1)) == NULL) {
76 ef16f8f6 2023-07-02 op return (NULL);
79 ef16f8f6 2023-07-02 op buf->size = len;
80 ef16f8f6 2023-07-02 op buf->max = max;
87 b0003f58 2021-03-08 op ibuf_realloc(struct ibuf *buf, size_t len)
89 b0003f58 2021-03-08 op unsigned char *b;
91 b0003f58 2021-03-08 op /* on static buffers max is eq size and so the following fails */
92 ef16f8f6 2023-07-02 op if (len > SIZE_MAX - buf->wpos || buf->wpos + len > buf->max) {
93 b0003f58 2021-03-08 op errno = ERANGE;
97 b0003f58 2021-03-08 op b = recallocarray(buf->buf, buf->size, buf->wpos + len, 1);
98 b0003f58 2021-03-08 op if (b == NULL)
100 b0003f58 2021-03-08 op buf->buf = b;
101 b0003f58 2021-03-08 op buf->size = buf->wpos + len;
107 b0003f58 2021-03-08 op ibuf_reserve(struct ibuf *buf, size_t len)
111 8623abea 2024-01-20 op if (len > SIZE_MAX - buf->wpos || buf->max == 0) {
112 ef16f8f6 2023-07-02 op errno = ERANGE;
113 ef16f8f6 2023-07-02 op return (NULL);
116 b0003f58 2021-03-08 op if (buf->wpos + len > buf->size)
117 b0003f58 2021-03-08 op if (ibuf_realloc(buf, len) == -1)
118 b0003f58 2021-03-08 op return (NULL);
120 b0003f58 2021-03-08 op b = buf->buf + buf->wpos;
121 b0003f58 2021-03-08 op buf->wpos += len;
126 ef16f8f6 2023-07-02 op ibuf_add(struct ibuf *buf, const void *data, size_t len)
130 ef16f8f6 2023-07-02 op if ((b = ibuf_reserve(buf, len)) == NULL)
133 ef16f8f6 2023-07-02 op memcpy(b, data, len);
138 8623abea 2024-01-20 op ibuf_add_ibuf(struct ibuf *buf, const struct ibuf *from)
140 8623abea 2024-01-20 op return ibuf_add(buf, ibuf_data(from), ibuf_size(from));
143 8623abea 2024-01-20 op /* remove after tree is converted */
145 ef16f8f6 2023-07-02 op ibuf_add_buf(struct ibuf *buf, const struct ibuf *from)
147 8623abea 2024-01-20 op return ibuf_add_ibuf(buf, from);
151 ef16f8f6 2023-07-02 op ibuf_add_n8(struct ibuf *buf, uint64_t value)
155 ef16f8f6 2023-07-02 op if (value > UINT8_MAX) {
156 ef16f8f6 2023-07-02 op errno = EINVAL;
160 ef16f8f6 2023-07-02 op return ibuf_add(buf, &v, sizeof(v));
164 ef16f8f6 2023-07-02 op ibuf_add_n16(struct ibuf *buf, uint64_t value)
168 ef16f8f6 2023-07-02 op if (value > UINT16_MAX) {
169 ef16f8f6 2023-07-02 op errno = EINVAL;
172 ef16f8f6 2023-07-02 op v = htobe16(value);
173 ef16f8f6 2023-07-02 op return ibuf_add(buf, &v, sizeof(v));
177 ef16f8f6 2023-07-02 op ibuf_add_n32(struct ibuf *buf, uint64_t value)
181 ef16f8f6 2023-07-02 op if (value > UINT32_MAX) {
182 ef16f8f6 2023-07-02 op errno = EINVAL;
185 ef16f8f6 2023-07-02 op v = htobe32(value);
186 ef16f8f6 2023-07-02 op return ibuf_add(buf, &v, sizeof(v));
190 ef16f8f6 2023-07-02 op ibuf_add_n64(struct ibuf *buf, uint64_t value)
192 ef16f8f6 2023-07-02 op value = htobe64(value);
193 8623abea 2024-01-20 op return ibuf_add(buf, &value, sizeof(value));
197 8623abea 2024-01-20 op ibuf_add_h16(struct ibuf *buf, uint64_t value)
201 8623abea 2024-01-20 op if (value > UINT16_MAX) {
202 8623abea 2024-01-20 op errno = EINVAL;
206 8623abea 2024-01-20 op return ibuf_add(buf, &v, sizeof(v));
210 8623abea 2024-01-20 op ibuf_add_h32(struct ibuf *buf, uint64_t value)
214 8623abea 2024-01-20 op if (value > UINT32_MAX) {
215 8623abea 2024-01-20 op errno = EINVAL;
219 8623abea 2024-01-20 op return ibuf_add(buf, &v, sizeof(v));
223 8623abea 2024-01-20 op ibuf_add_h64(struct ibuf *buf, uint64_t value)
225 ef16f8f6 2023-07-02 op return ibuf_add(buf, &value, sizeof(value));
229 ef16f8f6 2023-07-02 op ibuf_add_zero(struct ibuf *buf, size_t len)
233 ef16f8f6 2023-07-02 op if ((b = ibuf_reserve(buf, len)) == NULL)
235 8623abea 2024-01-20 op memset(b, 0, len);
240 b0003f58 2021-03-08 op ibuf_seek(struct ibuf *buf, size_t pos, size_t len)
242 8623abea 2024-01-20 op /* only allow seeking between rpos and wpos */
243 8623abea 2024-01-20 op if (ibuf_size(buf) < pos || SIZE_MAX - pos < len ||
244 8623abea 2024-01-20 op ibuf_size(buf) < pos + len) {
245 ef16f8f6 2023-07-02 op errno = ERANGE;
246 b0003f58 2021-03-08 op return (NULL);
249 8623abea 2024-01-20 op return (buf->buf + buf->rpos + pos);
253 ef16f8f6 2023-07-02 op ibuf_set(struct ibuf *buf, size_t pos, const void *data, size_t len)
257 ef16f8f6 2023-07-02 op if ((b = ibuf_seek(buf, pos, len)) == NULL)
260 ef16f8f6 2023-07-02 op memcpy(b, data, len);
265 ef16f8f6 2023-07-02 op ibuf_set_n8(struct ibuf *buf, size_t pos, uint64_t value)
269 ef16f8f6 2023-07-02 op if (value > UINT8_MAX) {
270 ef16f8f6 2023-07-02 op errno = EINVAL;
274 ef16f8f6 2023-07-02 op return (ibuf_set(buf, pos, &v, sizeof(v)));
278 ef16f8f6 2023-07-02 op ibuf_set_n16(struct ibuf *buf, size_t pos, uint64_t value)
282 ef16f8f6 2023-07-02 op if (value > UINT16_MAX) {
283 ef16f8f6 2023-07-02 op errno = EINVAL;
286 ef16f8f6 2023-07-02 op v = htobe16(value);
287 ef16f8f6 2023-07-02 op return (ibuf_set(buf, pos, &v, sizeof(v)));
291 ef16f8f6 2023-07-02 op ibuf_set_n32(struct ibuf *buf, size_t pos, uint64_t value)
295 ef16f8f6 2023-07-02 op if (value > UINT32_MAX) {
296 ef16f8f6 2023-07-02 op errno = EINVAL;
299 ef16f8f6 2023-07-02 op v = htobe32(value);
300 ef16f8f6 2023-07-02 op return (ibuf_set(buf, pos, &v, sizeof(v)));
304 ef16f8f6 2023-07-02 op ibuf_set_n64(struct ibuf *buf, size_t pos, uint64_t value)
306 ef16f8f6 2023-07-02 op value = htobe64(value);
307 ef16f8f6 2023-07-02 op return (ibuf_set(buf, pos, &value, sizeof(value)));
311 8623abea 2024-01-20 op ibuf_set_h16(struct ibuf *buf, size_t pos, uint64_t value)
315 8623abea 2024-01-20 op if (value > UINT16_MAX) {
316 8623abea 2024-01-20 op errno = EINVAL;
320 8623abea 2024-01-20 op return (ibuf_set(buf, pos, &v, sizeof(v)));
324 8623abea 2024-01-20 op ibuf_set_h32(struct ibuf *buf, size_t pos, uint64_t value)
328 8623abea 2024-01-20 op if (value > UINT32_MAX) {
329 8623abea 2024-01-20 op errno = EINVAL;
333 8623abea 2024-01-20 op return (ibuf_set(buf, pos, &v, sizeof(v)));
337 8623abea 2024-01-20 op ibuf_set_h64(struct ibuf *buf, size_t pos, uint64_t value)
339 8623abea 2024-01-20 op return (ibuf_set(buf, pos, &value, sizeof(value)));
343 8623abea 2024-01-20 op ibuf_data(const struct ibuf *buf)
345 8623abea 2024-01-20 op return (buf->buf + buf->rpos);
349 8623abea 2024-01-20 op ibuf_size(const struct ibuf *buf)
351 8623abea 2024-01-20 op return (buf->wpos - buf->rpos);
355 8623abea 2024-01-20 op ibuf_left(const struct ibuf *buf)
357 8623abea 2024-01-20 op if (buf->max == 0)
359 b0003f58 2021-03-08 op return (buf->max - buf->wpos);
363 8623abea 2024-01-20 op ibuf_truncate(struct ibuf *buf, size_t len)
365 8623abea 2024-01-20 op if (ibuf_size(buf) >= len) {
366 8623abea 2024-01-20 op buf->wpos = buf->rpos + len;
369 8623abea 2024-01-20 op if (buf->max == 0) {
370 8623abea 2024-01-20 op /* only allow to truncate down */
371 8623abea 2024-01-20 op errno = ERANGE;
374 8623abea 2024-01-20 op return ibuf_add_zero(buf, len - ibuf_size(buf));
378 8623abea 2024-01-20 op ibuf_rewind(struct ibuf *buf)
380 8623abea 2024-01-20 op buf->rpos = 0;
384 b0003f58 2021-03-08 op ibuf_close(struct msgbuf *msgbuf, struct ibuf *buf)
386 b0003f58 2021-03-08 op ibuf_enqueue(msgbuf, buf);
390 8623abea 2024-01-20 op ibuf_from_buffer(struct ibuf *buf, void *data, size_t len)
392 8623abea 2024-01-20 op memset(buf, 0, sizeof(*buf));
393 8623abea 2024-01-20 op buf->buf = data;
394 8623abea 2024-01-20 op buf->size = buf->wpos = len;
395 8623abea 2024-01-20 op buf->fd = -1;
399 8623abea 2024-01-20 op ibuf_from_ibuf(struct ibuf *buf, const struct ibuf *from)
401 8623abea 2024-01-20 op ibuf_from_buffer(buf, ibuf_data(from), ibuf_size(from));
405 8623abea 2024-01-20 op ibuf_get(struct ibuf *buf, void *data, size_t len)
407 8623abea 2024-01-20 op if (ibuf_size(buf) < len) {
408 8623abea 2024-01-20 op errno = EBADMSG;
412 8623abea 2024-01-20 op memcpy(data, ibuf_data(buf), len);
413 8623abea 2024-01-20 op buf->rpos += len;
418 8623abea 2024-01-20 op ibuf_get_ibuf(struct ibuf *buf, size_t len, struct ibuf *new)
420 8623abea 2024-01-20 op if (ibuf_size(buf) < len) {
421 8623abea 2024-01-20 op errno = EBADMSG;
425 8623abea 2024-01-20 op ibuf_from_buffer(new, ibuf_data(buf), len);
426 8623abea 2024-01-20 op buf->rpos += len;
431 8623abea 2024-01-20 op ibuf_get_n8(struct ibuf *buf, uint8_t *value)
433 8623abea 2024-01-20 op return ibuf_get(buf, value, sizeof(*value));
437 8623abea 2024-01-20 op ibuf_get_n16(struct ibuf *buf, uint16_t *value)
441 8623abea 2024-01-20 op rv = ibuf_get(buf, value, sizeof(*value));
442 8623abea 2024-01-20 op *value = be16toh(*value);
447 8623abea 2024-01-20 op ibuf_get_n32(struct ibuf *buf, uint32_t *value)
451 8623abea 2024-01-20 op rv = ibuf_get(buf, value, sizeof(*value));
452 8623abea 2024-01-20 op *value = be32toh(*value);
457 8623abea 2024-01-20 op ibuf_get_n64(struct ibuf *buf, uint64_t *value)
461 8623abea 2024-01-20 op rv = ibuf_get(buf, value, sizeof(*value));
462 8623abea 2024-01-20 op *value = be64toh(*value);
467 8623abea 2024-01-20 op ibuf_get_h16(struct ibuf *buf, uint16_t *value)
469 8623abea 2024-01-20 op return ibuf_get(buf, value, sizeof(*value));
473 8623abea 2024-01-20 op ibuf_get_h32(struct ibuf *buf, uint32_t *value)
475 8623abea 2024-01-20 op return ibuf_get(buf, value, sizeof(*value));
479 8623abea 2024-01-20 op ibuf_get_h64(struct ibuf *buf, uint64_t *value)
481 8623abea 2024-01-20 op return ibuf_get(buf, value, sizeof(*value));
485 8623abea 2024-01-20 op ibuf_skip(struct ibuf *buf, size_t len)
487 8623abea 2024-01-20 op if (ibuf_size(buf) < len) {
488 8623abea 2024-01-20 op errno = EBADMSG;
492 8623abea 2024-01-20 op buf->rpos += len;
497 ef16f8f6 2023-07-02 op ibuf_free(struct ibuf *buf)
499 ef16f8f6 2023-07-02 op if (buf == NULL)
501 8623abea 2024-01-20 op if (buf->max == 0) /* if buf lives on the stack */
502 8623abea 2024-01-20 op abort(); /* abort before causing more harm */
503 ef16f8f6 2023-07-02 op if (buf->fd != -1)
504 ef16f8f6 2023-07-02 op close(buf->fd);
505 ef16f8f6 2023-07-02 op freezero(buf->buf, buf->size);
510 ef16f8f6 2023-07-02 op ibuf_fd_avail(struct ibuf *buf)
512 ef16f8f6 2023-07-02 op return (buf->fd != -1);
516 ef16f8f6 2023-07-02 op ibuf_fd_get(struct ibuf *buf)
520 ef16f8f6 2023-07-02 op fd = buf->fd;
521 ef16f8f6 2023-07-02 op buf->fd = -1;
526 ef16f8f6 2023-07-02 op ibuf_fd_set(struct ibuf *buf, int fd)
528 8623abea 2024-01-20 op if (buf->max == 0) /* if buf lives on the stack */
529 8623abea 2024-01-20 op abort(); /* abort before causing more harm */
530 ef16f8f6 2023-07-02 op if (buf->fd != -1)
531 ef16f8f6 2023-07-02 op close(buf->fd);
532 ef16f8f6 2023-07-02 op buf->fd = fd;
536 b0003f58 2021-03-08 op ibuf_write(struct msgbuf *msgbuf)
538 b0003f58 2021-03-08 op struct iovec iov[IOV_MAX];
539 b0003f58 2021-03-08 op struct ibuf *buf;
540 b0003f58 2021-03-08 op unsigned int i = 0;
543 b0003f58 2021-03-08 op memset(&iov, 0, sizeof(iov));
544 b0003f58 2021-03-08 op TAILQ_FOREACH(buf, &msgbuf->bufs, entry) {
545 b0003f58 2021-03-08 op if (i >= IOV_MAX)
547 8623abea 2024-01-20 op iov[i].iov_base = ibuf_data(buf);
548 8623abea 2024-01-20 op iov[i].iov_len = ibuf_size(buf);
553 b0003f58 2021-03-08 op if ((n = writev(msgbuf->fd, iov, i)) == -1) {
554 b0003f58 2021-03-08 op if (errno == EINTR)
556 b0003f58 2021-03-08 op if (errno == ENOBUFS)
557 b0003f58 2021-03-08 op errno = EAGAIN;
561 b0003f58 2021-03-08 op if (n == 0) { /* connection closed */
566 b0003f58 2021-03-08 op msgbuf_drain(msgbuf, n);
572 b0003f58 2021-03-08 op msgbuf_init(struct msgbuf *msgbuf)
574 b0003f58 2021-03-08 op msgbuf->queued = 0;
575 b0003f58 2021-03-08 op msgbuf->fd = -1;
576 b0003f58 2021-03-08 op TAILQ_INIT(&msgbuf->bufs);
580 b0003f58 2021-03-08 op msgbuf_drain(struct msgbuf *msgbuf, size_t n)
582 b0003f58 2021-03-08 op struct ibuf *buf, *next;
584 b0003f58 2021-03-08 op for (buf = TAILQ_FIRST(&msgbuf->bufs); buf != NULL && n > 0;
585 b0003f58 2021-03-08 op buf = next) {
586 b0003f58 2021-03-08 op next = TAILQ_NEXT(buf, entry);
587 8623abea 2024-01-20 op if (n >= ibuf_size(buf)) {
588 8623abea 2024-01-20 op n -= ibuf_size(buf);
589 b0003f58 2021-03-08 op ibuf_dequeue(msgbuf, buf);
591 b0003f58 2021-03-08 op buf->rpos += n;
598 b0003f58 2021-03-08 op msgbuf_clear(struct msgbuf *msgbuf)
600 b0003f58 2021-03-08 op struct ibuf *buf;
602 b0003f58 2021-03-08 op while ((buf = TAILQ_FIRST(&msgbuf->bufs)) != NULL)
603 b0003f58 2021-03-08 op ibuf_dequeue(msgbuf, buf);
607 b0003f58 2021-03-08 op msgbuf_write(struct msgbuf *msgbuf)
609 b0003f58 2021-03-08 op struct iovec iov[IOV_MAX];
610 e445acd1 2022-03-19 op struct ibuf *buf, *buf0 = NULL;
611 b0003f58 2021-03-08 op unsigned int i = 0;
613 b0003f58 2021-03-08 op struct msghdr msg;
614 b0003f58 2021-03-08 op struct cmsghdr *cmsg;
616 b0003f58 2021-03-08 op struct cmsghdr hdr;
617 b0003f58 2021-03-08 op char buf[CMSG_SPACE(sizeof(int))];
620 b0003f58 2021-03-08 op memset(&iov, 0, sizeof(iov));
621 b0003f58 2021-03-08 op memset(&msg, 0, sizeof(msg));
622 b0003f58 2021-03-08 op memset(&cmsgbuf, 0, sizeof(cmsgbuf));
623 b0003f58 2021-03-08 op TAILQ_FOREACH(buf, &msgbuf->bufs, entry) {
624 b0003f58 2021-03-08 op if (i >= IOV_MAX)
626 e445acd1 2022-03-19 op if (i > 0 && buf->fd != -1)
628 8623abea 2024-01-20 op iov[i].iov_base = ibuf_data(buf);
629 8623abea 2024-01-20 op iov[i].iov_len = ibuf_size(buf);
631 b0003f58 2021-03-08 op if (buf->fd != -1)
635 b0003f58 2021-03-08 op msg.msg_iov = iov;
636 b0003f58 2021-03-08 op msg.msg_iovlen = i;
638 e445acd1 2022-03-19 op if (buf0 != NULL) {
639 b0003f58 2021-03-08 op msg.msg_control = (caddr_t)&cmsgbuf.buf;
640 b0003f58 2021-03-08 op msg.msg_controllen = sizeof(cmsgbuf.buf);
641 b0003f58 2021-03-08 op cmsg = CMSG_FIRSTHDR(&msg);
642 b0003f58 2021-03-08 op cmsg->cmsg_len = CMSG_LEN(sizeof(int));
643 b0003f58 2021-03-08 op cmsg->cmsg_level = SOL_SOCKET;
644 b0003f58 2021-03-08 op cmsg->cmsg_type = SCM_RIGHTS;
645 e445acd1 2022-03-19 op *(int *)CMSG_DATA(cmsg) = buf0->fd;
649 b0003f58 2021-03-08 op if ((n = sendmsg(msgbuf->fd, &msg, 0)) == -1) {
650 b0003f58 2021-03-08 op if (errno == EINTR)
652 b0003f58 2021-03-08 op if (errno == ENOBUFS)
653 b0003f58 2021-03-08 op errno = EAGAIN;
657 b0003f58 2021-03-08 op if (n == 0) { /* connection closed */
663 b0003f58 2021-03-08 op * assumption: fd got sent if sendmsg sent anything
664 b0003f58 2021-03-08 op * this works because fds are passed one at a time
666 e445acd1 2022-03-19 op if (buf0 != NULL) {
667 e445acd1 2022-03-19 op close(buf0->fd);
668 e445acd1 2022-03-19 op buf0->fd = -1;
671 b0003f58 2021-03-08 op msgbuf_drain(msgbuf, n);
677 8623abea 2024-01-20 op msgbuf_queuelen(struct msgbuf *msgbuf)
679 8623abea 2024-01-20 op return (msgbuf->queued);
683 b0003f58 2021-03-08 op ibuf_enqueue(struct msgbuf *msgbuf, struct ibuf *buf)
685 8623abea 2024-01-20 op if (buf->max == 0) /* if buf lives on the stack */
686 8623abea 2024-01-20 op abort(); /* abort before causing more harm */
687 b0003f58 2021-03-08 op TAILQ_INSERT_TAIL(&msgbuf->bufs, buf, entry);
688 b0003f58 2021-03-08 op msgbuf->queued++;
692 b0003f58 2021-03-08 op ibuf_dequeue(struct msgbuf *msgbuf, struct ibuf *buf)
694 b0003f58 2021-03-08 op TAILQ_REMOVE(&msgbuf->bufs, buf, entry);
695 b0003f58 2021-03-08 op msgbuf->queued--;
696 b0003f58 2021-03-08 op ibuf_free(buf);