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platform_system_core/liblog/logd_write.c

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/*
* Copyright (C) 2007-2014 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 <errno.h>
#include <fcntl.h>
#ifdef HAVE_PTHREADS
#include <pthread.h>
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#if (FAKE_LOG_DEVICE == 0)
#include <sys/socket.h>
#include <sys/un.h>
#endif
#include <time.h>
#include <unistd.h>
#ifdef __BIONIC__
#include <android/set_abort_message.h>
#endif
#include <log/logd.h>
#include <log/logger.h>
#include <log/log_read.h>
#include <private/android_filesystem_config.h>
#define LOG_BUF_SIZE 1024
#if FAKE_LOG_DEVICE
/* This will be defined when building for the host. */
#include "fake_log_device.h"
#endif
static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
#ifdef HAVE_PTHREADS
static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
#endif
#ifndef __unused
#define __unused __attribute__((__unused__))
#endif
#if FAKE_LOG_DEVICE
#define WEAK __attribute__((weak))
static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1 };
#else
static int logd_fd = -1;
#endif
/*
* This is used by the C++ code to decide if it should write logs through
* the C code. Basically, if /dev/socket/logd is available, we're running in
* the simulator rather than a desktop tool and want to use the device.
*/
static enum {
kLogUninitialized, kLogNotAvailable, kLogAvailable
} g_log_status = kLogUninitialized;
int __android_log_dev_available(void)
{
if (g_log_status == kLogUninitialized) {
if (access("/dev/socket/logdw", W_OK) == 0)
g_log_status = kLogAvailable;
else
g_log_status = kLogNotAvailable;
}
return (g_log_status == kLogAvailable);
}
#if !FAKE_LOG_DEVICE
/* give up, resources too limited */
static int __write_to_log_null(log_id_t log_fd __unused, struct iovec *vec __unused,
size_t nr __unused)
{
return -1;
}
#endif
/* log_init_lock assumed */
static int __write_to_log_initialize()
{
int i, ret = 0;
#if FAKE_LOG_DEVICE
for (i = 0; i < LOG_ID_MAX; i++) {
char buf[sizeof("/dev/log_system")];
snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i));
log_fds[i] = fakeLogOpen(buf, O_WRONLY);
}
#else
if (logd_fd >= 0) {
i = logd_fd;
logd_fd = -1;
close(i);
}
i = socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
if (i < 0) {
ret = -errno;
write_to_log = __write_to_log_null;
} else if (fcntl(i, F_SETFL, O_NONBLOCK) < 0) {
ret = -errno;
close(i);
i = -1;
write_to_log = __write_to_log_null;
} else {
struct sockaddr_un un;
memset(&un, 0, sizeof(struct sockaddr_un));
un.sun_family = AF_UNIX;
strcpy(un.sun_path, "/dev/socket/logdw");
if (connect(i, (struct sockaddr *)&un, sizeof(struct sockaddr_un)) < 0) {
ret = -errno;
close(i);
i = -1;
}
}
logd_fd = i;
#endif
return ret;
}
static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
{
ssize_t ret;
#if FAKE_LOG_DEVICE
int log_fd;
if (/*(int)log_id >= 0 &&*/ (int)log_id < (int)LOG_ID_MAX) {
log_fd = log_fds[(int)log_id];
} else {
return -EBADF;
}
do {
ret = fakeLogWritev(log_fd, vec, nr);
if (ret < 0) {
ret = -errno;
}
} while (ret == -EINTR);
#else
static const unsigned header_length = 3;
struct iovec newVec[nr + header_length];
typeof_log_id_t log_id_buf;
uint16_t tid;
struct timespec ts;
log_time realtime_ts;
size_t i, payload_size;
static uid_t last_uid = AID_ROOT; /* logd *always* starts up as AID_ROOT */
if (last_uid == AID_ROOT) { /* have we called to get the UID yet? */
last_uid = getuid();
}
if (last_uid == AID_LOGD) { /* logd, after initialization and priv drop */
/*
* ignore log messages we send to ourself (logd).
* Such log messages are often generated by libraries we depend on
* which use standard Android logging.
*/
return 0;
}
if (logd_fd < 0) {
return -EBADF;
}
/*
* struct {
* // what we provide
* typeof_log_id_t log_id;
* u16 tid;
* log_time realtime;
* // caller provides
* union {
* struct {
* char prio;
* char payload[];
* } string;
* struct {
* uint32_t tag
* char payload[];
* } binary;
* };
* };
*/
clock_gettime(CLOCK_REALTIME, &ts);
realtime_ts.tv_sec = ts.tv_sec;
realtime_ts.tv_nsec = ts.tv_nsec;
log_id_buf = log_id;
tid = gettid();
newVec[0].iov_base = (unsigned char *) &log_id_buf;
newVec[0].iov_len = sizeof_log_id_t;
newVec[1].iov_base = (unsigned char *) &tid;
newVec[1].iov_len = sizeof(tid);
newVec[2].iov_base = (unsigned char *) &realtime_ts;
newVec[2].iov_len = sizeof(log_time);
for (payload_size = 0, i = header_length; i < nr + header_length; i++) {
newVec[i].iov_base = vec[i - header_length].iov_base;
payload_size += newVec[i].iov_len = vec[i - header_length].iov_len;
if (payload_size > LOGGER_ENTRY_MAX_PAYLOAD) {
newVec[i].iov_len -= payload_size - LOGGER_ENTRY_MAX_PAYLOAD;
if (newVec[i].iov_len) {
++i;
}
break;
}
}
/*
* The write below could be lost, but will never block.
*
* ENOTCONN occurs if logd dies.
* EAGAIN occurs if logd is overloaded.
*/
ret = writev(logd_fd, newVec, i);
if (ret < 0) {
ret = -errno;
if (ret == -ENOTCONN) {
#ifdef HAVE_PTHREADS
pthread_mutex_lock(&log_init_lock);
#endif
ret = __write_to_log_initialize();
#ifdef HAVE_PTHREADS
pthread_mutex_unlock(&log_init_lock);
#endif
if (ret < 0) {
return ret;
}
ret = writev(logd_fd, newVec, nr + header_length);
if (ret < 0) {
ret = -errno;
}
}
}
if (ret > (ssize_t)(sizeof_log_id_t + sizeof(tid) + sizeof(log_time))) {
ret -= sizeof_log_id_t + sizeof(tid) + sizeof(log_time);
}
#endif
return ret;
}
#if FAKE_LOG_DEVICE
static const char *LOG_NAME[LOG_ID_MAX] = {
[LOG_ID_MAIN] = "main",
[LOG_ID_RADIO] = "radio",
[LOG_ID_EVENTS] = "events",
[LOG_ID_SYSTEM] = "system",
[LOG_ID_CRASH] = "crash"
};
const WEAK char *android_log_id_to_name(log_id_t log_id)
{
if (log_id >= LOG_ID_MAX) {
log_id = LOG_ID_MAIN;
}
return LOG_NAME[log_id];
}
#endif
static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
{
#ifdef HAVE_PTHREADS
pthread_mutex_lock(&log_init_lock);
#endif
if (write_to_log == __write_to_log_init) {
int ret;
ret = __write_to_log_initialize();
if (ret < 0) {
#ifdef HAVE_PTHREADS
pthread_mutex_unlock(&log_init_lock);
#endif
return ret;
}
write_to_log = __write_to_log_kernel;
}
#ifdef HAVE_PTHREADS
pthread_mutex_unlock(&log_init_lock);
#endif
return write_to_log(log_id, vec, nr);
}
int __android_log_write(int prio, const char *tag, const char *msg)
{
struct iovec vec[3];
log_id_t log_id = LOG_ID_MAIN;
char tmp_tag[32];
if (!tag)
tag = "";
/* XXX: This needs to go! */
if (!strcmp(tag, "HTC_RIL") ||
!strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
!strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
!strcmp(tag, "AT") ||
!strcmp(tag, "GSM") ||
!strcmp(tag, "STK") ||
!strcmp(tag, "CDMA") ||
!strcmp(tag, "PHONE") ||
!strcmp(tag, "SMS")) {
log_id = LOG_ID_RADIO;
/* Inform third party apps/ril/radio.. to use Rlog or RLOG */
snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
tag = tmp_tag;
}
#if __BIONIC__
if (prio == ANDROID_LOG_FATAL) {
android_set_abort_message(msg);
}
#endif
vec[0].iov_base = (unsigned char *) &prio;
vec[0].iov_len = 1;
vec[1].iov_base = (void *) tag;
vec[1].iov_len = strlen(tag) + 1;
vec[2].iov_base = (void *) msg;
vec[2].iov_len = strlen(msg) + 1;
return write_to_log(log_id, vec, 3);
}
int __android_log_buf_write(int bufID, int prio, const char *tag, const char *msg)
{
struct iovec vec[3];
char tmp_tag[32];
if (!tag)
tag = "";
/* XXX: This needs to go! */
if ((bufID != LOG_ID_RADIO) &&
(!strcmp(tag, "HTC_RIL") ||
!strncmp(tag, "RIL", 3) || /* Any log tag with "RIL" as the prefix */
!strncmp(tag, "IMS", 3) || /* Any log tag with "IMS" as the prefix */
!strcmp(tag, "AT") ||
!strcmp(tag, "GSM") ||
!strcmp(tag, "STK") ||
!strcmp(tag, "CDMA") ||
!strcmp(tag, "PHONE") ||
!strcmp(tag, "SMS"))) {
bufID = LOG_ID_RADIO;
/* Inform third party apps/ril/radio.. to use Rlog or RLOG */
snprintf(tmp_tag, sizeof(tmp_tag), "use-Rlog/RLOG-%s", tag);
tag = tmp_tag;
}
vec[0].iov_base = (unsigned char *) &prio;
vec[0].iov_len = 1;
vec[1].iov_base = (void *) tag;
vec[1].iov_len = strlen(tag) + 1;
vec[2].iov_base = (void *) msg;
vec[2].iov_len = strlen(msg) + 1;
return write_to_log(bufID, vec, 3);
}
int __android_log_vprint(int prio, const char *tag, const char *fmt, va_list ap)
{
char buf[LOG_BUF_SIZE];
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
return __android_log_write(prio, tag, buf);
}
int __android_log_print(int prio, const char *tag, const char *fmt, ...)
{
va_list ap;
char buf[LOG_BUF_SIZE];
va_start(ap, fmt);
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
va_end(ap);
return __android_log_write(prio, tag, buf);
}
int __android_log_buf_print(int bufID, int prio, const char *tag, const char *fmt, ...)
{
va_list ap;
char buf[LOG_BUF_SIZE];
va_start(ap, fmt);
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
va_end(ap);
return __android_log_buf_write(bufID, prio, tag, buf);
}
void __android_log_assert(const char *cond, const char *tag,
const char *fmt, ...)
{
char buf[LOG_BUF_SIZE];
if (fmt) {
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, LOG_BUF_SIZE, fmt, ap);
va_end(ap);
} else {
/* Msg not provided, log condition. N.B. Do not use cond directly as
* format string as it could contain spurious '%' syntax (e.g.
* "%d" in "blocks%devs == 0").
*/
if (cond)
snprintf(buf, LOG_BUF_SIZE, "Assertion failed: %s", cond);
else
strcpy(buf, "Unspecified assertion failed");
}
__android_log_write(ANDROID_LOG_FATAL, tag, buf);
__builtin_trap(); /* trap so we have a chance to debug the situation */
/* NOTREACHED */
}
int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
{
struct iovec vec[2];
vec[0].iov_base = &tag;
vec[0].iov_len = sizeof(tag);
vec[1].iov_base = (void*)payload;
vec[1].iov_len = len;
return write_to_log(LOG_ID_EVENTS, vec, 2);
}
/*
* Like __android_log_bwrite, but takes the type as well. Doesn't work
* for the general case where we're generating lists of stuff, but very
* handy if we just want to dump an integer into the log.
*/
int __android_log_btwrite(int32_t tag, char type, const void *payload,
size_t len)
{
struct iovec vec[3];
vec[0].iov_base = &tag;
vec[0].iov_len = sizeof(tag);
vec[1].iov_base = &type;
vec[1].iov_len = sizeof(type);
vec[2].iov_base = (void*)payload;
vec[2].iov_len = len;
return write_to_log(LOG_ID_EVENTS, vec, 3);
}
/*
* Like __android_log_bwrite, but used for writing strings to the
* event log.
*/
int __android_log_bswrite(int32_t tag, const char *payload)
{
struct iovec vec[4];
char type = EVENT_TYPE_STRING;
uint32_t len = strlen(payload);
vec[0].iov_base = &tag;
vec[0].iov_len = sizeof(tag);
vec[1].iov_base = &type;
vec[1].iov_len = sizeof(type);
vec[2].iov_base = &len;
vec[2].iov_len = sizeof(len);
vec[3].iov_base = (void*)payload;
vec[3].iov_len = len;
return write_to_log(LOG_ID_EVENTS, vec, 4);
}
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