summaryrefslogtreecommitdiffstats
blob: 814d96d097a03fee86bc3ac60d7ba64d8e7dc7ae (plain) (blame)
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
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
/*
** Copyright 2014, The Android Open Source Project
**
** 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
**
**     http://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 <ctype.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>

#include <android/log.h>

struct cache {
    const prop_info *pinfo;
    uint32_t serial;
    char c;
};

static void refresh_cache(struct cache *cache, const char *key)
{
    uint32_t serial;
    char buf[PROP_VALUE_MAX];

    if (!cache->pinfo) {
        cache->pinfo = __system_property_find(key);
        if (!cache->pinfo) {
            return;
        }
    }
    serial = __system_property_serial(cache->pinfo);
    if (serial == cache->serial) {
        return;
    }
    cache->serial = serial;
    __system_property_read(cache->pinfo, 0, buf);
    cache->c = buf[0];
}

static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;

static int __android_log_level(const char *tag, int def)
{
    /* sizeof() is used on this array below */
    static const char log_namespace[] = "persist.log.tag.";
    static const size_t base_offset = 8; /* skip "persist." */
    /* calculate the size of our key temporary buffer */
    const size_t taglen = (tag && *tag) ? strlen(tag) : 0;
    /* sizeof(log_namespace) = strlen(log_namespace) + 1 */
    char key[sizeof(log_namespace) + taglen];
    char *kp;
    size_t i;
    char c = 0;
    /*
     * Single layer cache of four properties. Priorities are:
     *    log.tag.<tag>
     *    persist.log.tag.<tag>
     *    log.tag
     *    persist.log.tag
     * Where the missing tag matches all tags and becomes the
     * system global default. We do not support ro.log.tag* .
     */
    static char *last_tag;
    static uint32_t global_serial;
    uint32_t current_global_serial;
    static struct cache tag_cache[2] = {
        { NULL, -1, 0 },
        { NULL, -1, 0 }
    };
    static struct cache global_cache[2] = {
        { NULL, -1, 0 },
        { NULL, -1, 0 }
    };

    strcpy(key, log_namespace);

    pthread_mutex_lock(&lock);

    current_global_serial = __system_property_area_serial();

    if (taglen) {
        uint32_t current_local_serial = current_global_serial;

        if (!last_tag || (last_tag[0] != tag[0]) || strcmp(last_tag + 1, tag + 1)) {
            /* invalidate log.tag.<tag> cache */
            for(i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
                tag_cache[i].pinfo = NULL;
                tag_cache[i].serial = -1;
                tag_cache[i].c = '\0';
            }
            free(last_tag);
            last_tag = NULL;
            current_global_serial = -1;
        }
        if (!last_tag) {
            last_tag = strdup(tag);
        }
        strcpy(key + sizeof(log_namespace) - 1, tag);

        kp = key;
        for(i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
            if (current_local_serial != global_serial) {
                refresh_cache(&tag_cache[i], kp);
            }

            if (tag_cache[i].c) {
                c = tag_cache[i].c;
                break;
            }

            kp = key + base_offset;
        }
    }

    switch (toupper(c)) { /* if invalid, resort to global */
    case 'V':
    case 'D':
    case 'I':
    case 'W':
    case 'E':
    case 'F': /* Not officially supported */
    case 'A':
    case 'S':
        break;
    default:
        /* clear '.' after log.tag */
        key[sizeof(log_namespace) - 2] = '\0';

        kp = key;
        for(i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) {
            if (current_global_serial != global_serial) {
                refresh_cache(&global_cache[i], kp);
            }

            if (global_cache[i].c) {
                c = global_cache[i].c;
                break;
            }

            kp = key + base_offset;
        }
        break;
    }

    global_serial = current_global_serial;

    pthread_mutex_unlock(&lock);

    switch (toupper(c)) {
    case 'V': return ANDROID_LOG_VERBOSE;
    case 'D': return ANDROID_LOG_DEBUG;
    case 'I': return ANDROID_LOG_INFO;
    case 'W': return ANDROID_LOG_WARN;
    case 'E': return ANDROID_LOG_ERROR;
    case 'F': /* FALLTHRU */ /* Not officially supported */
    case 'A': return ANDROID_LOG_FATAL;
    case 'S': return -1; /* ANDROID_LOG_SUPPRESS */
    }
    return def;
}

int __android_log_is_loggable(int prio, const char *tag, int def)
{
    int logLevel = __android_log_level(tag, def);
    return logLevel >= 0 && prio >= logLevel;
}

char android_log_timestamp()
{
    static struct cache r_time_cache = { NULL, -1, 0 };
    static struct cache p_time_cache = { NULL, -1, 0 };
    static uint32_t serial;
    uint32_t current_serial;
    char retval;

    pthread_mutex_lock(&lock);

    current_serial = __system_property_area_serial();
    if (current_serial != serial) {
        refresh_cache(&r_time_cache, "ro.logd.timestamp");
        refresh_cache(&p_time_cache, "persist.logd.timestamp");
        serial = current_serial;
    }
    if (!(retval = p_time_cache.c)) {
        retval = r_time_cache.c;
    }

    pthread_mutex_unlock(&lock);

    return tolower(retval ?: 'r');
}