1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2013 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "sd-bus.h"
#define KDBUS_PART_NEXT(item) \
(typeof(item))(((uint8_t *)item) + ALIGN8((item)->size))
#define KDBUS_PART_FOREACH(part, head, first) \
for (part = (head)->first; \
(uint8_t *)(part) < (uint8_t *)(head) + (head)->size; \
part = KDBUS_PART_NEXT(part))
#define KDBUS_PART_HEADER_SIZE offsetof(struct kdbus_item, data)
#define KDBUS_ITEM_SIZE(s) ALIGN8((s) + KDBUS_PART_HEADER_SIZE)
#define MEMFD_CACHE_MAX 32
/* When we cache a memfd block for reuse, we will truncate blocks
* longer than this in order not to keep too much data around. */
#define MEMFD_CACHE_ITEM_SIZE_MAX (128*1024)
/* This determines at which minimum size we prefer sending memfds over
* sending vectors */
#define MEMFD_MIN_SIZE (128*1024)
/* The size of the per-connection memory pool that we set up and where
* the kernel places our incoming messages */
#define KDBUS_POOL_SIZE (16*1024*1024)
struct memfd_cache {
int fd;
void *address;
size_t size;
};
int bus_kernel_connect(sd_bus *b);
int bus_kernel_take_fd(sd_bus *b);
int bus_kernel_write_message(sd_bus *bus, sd_bus_message *m);
int bus_kernel_read_message(sd_bus *bus, sd_bus_message **m);
int bus_kernel_create(const char *name, char **s);
int bus_kernel_pop_memfd(sd_bus *bus, void **address, size_t *size);
void bus_kernel_push_memfd(sd_bus *bus, int fd, void *address, size_t size);
void bus_kernel_flush_memfd(sd_bus *bus);
int bus_kernel_parse_unique_name(const char *s, uint64_t *id);
|
