forked from openbmc/obmc-console
-
Notifications
You must be signed in to change notification settings - Fork 0
/
log-handler.c
153 lines (120 loc) · 3.17 KB
/
log-handler.c
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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
/**
* Copyright © 2016 IBM Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <endian.h>
#include <err.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <linux/types.h>
#include "console-server.h"
struct log_handler {
struct handler handler;
struct console *console;
int fd;
size_t size;
size_t maxsize;
int pagesize;
};
static const char *default_filename = LOCALSTATEDIR "/log/obmc-console.log";
static const size_t logsize = 16 * 1024;
static struct log_handler *to_log_handler(struct handler *handler)
{
return container_of(handler, struct log_handler, handler);
}
static int log_init(struct handler *handler, struct console *console,
struct config *config __attribute__((unused)))
{
struct log_handler *lh = to_log_handler(handler);
const char *filename;
int rc;
lh->console = console;
lh->maxsize = logsize;
lh->pagesize = 4096;
lh->size = 0;
filename = config_get_value(config, "logfile");
if (!filename)
filename = default_filename;
lh->fd = open(filename, O_RDWR | O_CREAT, 0644);
if (lh->fd < 0) {
warn("Can't open log buffer file %s", filename);
return -1;
}
rc = ftruncate(lh->fd, 0);
if (rc) {
warn("Can't truncate file %s", filename);
close(lh->fd);
return -1;
}
return 0;
}
static int log_trim(struct log_handler *lh, size_t space)
{
int rc, n_shift_pages, shift_len, shift_start;
off_t pos;
void *buf;
pos = lseek(lh->fd, 0, SEEK_CUR);
n_shift_pages = (space + lh->pagesize - 1) / lh->pagesize;
shift_start = n_shift_pages * lh->pagesize;
shift_len = pos - (n_shift_pages * lh->pagesize);
buf = mmap(NULL, pos, PROT_READ | PROT_WRITE, MAP_SHARED, lh->fd, 0);
if (buf == MAP_FAILED)
return -1;
memmove(buf, buf + shift_start, shift_len);
munmap(buf, pos);
lh->size = shift_len;
rc = ftruncate(lh->fd, lh->size);
if (rc)
warn("failed to truncate file");
lseek(lh->fd, 0, SEEK_END);
return 0;
}
static int log_data(struct handler *handler, uint8_t *buf, size_t len)
{
struct log_handler *lh = to_log_handler(handler);
int rc;
if (len > lh->maxsize) {
buf += len - lh->maxsize;
len = lh->maxsize;
}
if (lh->size + len > lh->maxsize) {
rc = log_trim(lh, len);
if (rc)
return rc;
}
rc = write_buf_to_fd(lh->fd, buf, len);
if (rc)
return rc;
lh->size += len;
return 0;
}
static void log_fini(struct handler *handler)
{
struct log_handler *lh = to_log_handler(handler);
close(lh->fd);
}
static struct log_handler log_handler = {
.handler = {
.name = "log",
.init = log_init,
.data_in = log_data,
.fini = log_fini,
},
};
console_register_handler(&log_handler.handler);