1/*
2 * Copyright (c) 2004-2011 Apple Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#include <TargetConditionals.h>
25
26#if TARGET_IPHONE_SIMULATOR
27struct _not_empty;
28#else
29
30#include <sys/types.h>
31#include <sys/stat.h>
32#include <sys/socket.h>
33#include <sys/un.h>
34#include <sys/uio.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <fcntl.h>
39#include <errno.h>
40#include <unistd.h>
41#include "daemon.h"
42
43#define forever for(;;)
44
45#define MY_ID "klog_in"
46#define BUFF_SIZE 4096
47
48static char inbuf[BUFF_SIZE];
49static int bx;
50static int kfd = -1;
51static dispatch_source_t in_src;
52static dispatch_queue_t in_queue;
53
54void
55klog_in_acceptdata(int fd)
56{
57	ssize_t len;
58	uint32_t i;
59	char *p, *q;
60	asl_msg_t *m;
61
62	len = read(fd, inbuf + bx, BUFF_SIZE - bx);
63	if (len <= 0) return;
64
65	p = inbuf;
66	q = p + bx;
67
68	for (i = 0; i < len; i++, q++)
69	{
70		if (*q == '\n')
71		{
72			*q = '\0';
73			m = asl_input_parse(p, q - p, NULL, SOURCE_KERN);
74			process_message(m, SOURCE_KERN);
75			p = q + 1;
76		}
77	}
78
79	if (p != inbuf)
80	{
81		memmove(inbuf, p, BUFF_SIZE - bx - 1);
82		bx = q - p;
83	}
84}
85
86int
87klog_in_init()
88{
89	static dispatch_once_t once;
90
91	dispatch_once(&once, ^{
92		in_queue = dispatch_queue_create(MY_ID, NULL);
93	});
94
95	asldebug("%s: init\n", MY_ID);
96	if (kfd >= 0) return 0;
97
98	kfd = open(_PATH_KLOG, O_RDONLY, 0);
99	if (kfd < 0)
100	{
101		asldebug("%s: couldn't open %s: %s\n", MY_ID, _PATH_KLOG, strerror(errno));
102		return -1;
103	}
104
105	if (fcntl(kfd, F_SETFL, O_NONBLOCK) < 0)
106	{
107		close(kfd);
108		kfd = -1;
109		asldebug("%s: couldn't set O_NONBLOCK for fd %d (%s): %s\n", MY_ID, kfd, _PATH_KLOG, strerror(errno));
110		return -1;
111	}
112
113	in_src = dispatch_source_create(DISPATCH_SOURCE_TYPE_READ, (uintptr_t)kfd, 0, in_queue);
114	dispatch_source_set_event_handler(in_src, ^{ klog_in_acceptdata(kfd); });
115
116	dispatch_resume(in_src);
117	return 0;
118}
119
120int
121klog_in_close(void)
122{
123	if (kfd < 0) return 1;
124
125	dispatch_source_cancel(in_src);
126	dispatch_release(in_src);
127	in_src = NULL;
128
129	close(kfd);
130	kfd = -1;
131
132	return 0;
133}
134
135int
136klog_in_reset(void)
137{
138	return 0;
139}
140
141#endif /* !TARGET_IPHONE_SIMULATOR */
142