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am a69270db: Merge "liblog: enable logging to logd." 

* commit 'a69270db05cea27bf185e60af46dd46e938c7e99':
  liblog: enable logging to logd.
This commit is contained in:
Mark Salyzyn 2014-02-28 22:39:21 +00:00 committed by Android Git Automerger
parent a931cf072a a69270db05
commit b0eaeb42ce
8 changed files with 1452 additions and 460 deletions
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8
include/log/logger.h
View File

@ -79,14 +79,10 @@ struct logger_entry_v3 {
struct log_msg {
union {
unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1];
struct logger_entry_v2 entry;
struct logger_entry_v3 entry;
struct logger_entry_v3 entry_v3;
struct logger_entry_v2 entry_v2;
struct logger_entry entry_v1;
struct {
unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1];
log_id_t id;
} extra;
} __attribute__((aligned(4)));
#ifdef __cplusplus
/* Matching log_time operators */
@ -126,7 +122,7 @@ struct log_msg {
/* packet methods */
log_id_t id()
{
return extra.id;
return (log_id_t) entry.lid;
}
char *msg()
{

12
init/devices.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2007 The Android Open Source Project
* 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.
@ -47,6 +47,8 @@
#include "util.h"
#include "log.h"
#define UNUSED __attribute__((__unused__))
#define SYSFS_PREFIX "/sys"
#define FIRMWARE_DIR1 "/etc/firmware"
#define FIRMWARE_DIR2 "/vendor/firmware"
@ -193,7 +195,7 @@ static mode_t get_device_perm(const char *path, unsigned *uid, unsigned *gid)
}
static void make_device(const char *path,
const char *upath,
const char *upath UNUSED,
int block, int major, int minor)
{
unsigned uid;
@ -589,6 +591,11 @@ static void mkdir_recursive_for_devpath(const char *devpath)
mkdir_recursive(dir, 0755);
}
static inline void __attribute__((__deprecated__)) kernel_logger()
{
INFO("kernel logger is deprecated\n");
}
static void handle_generic_device_event(struct uevent *uevent)
{
char *base;
@ -675,6 +682,7 @@ static void handle_generic_device_event(struct uevent *uevent)
make_dir(base, 0755);
} else if(!strncmp(uevent->subsystem, "misc", 4) &&
!strncmp(name, "log_", 4)) {
kernel_logger();
base = "/dev/log/";
make_dir(base, 0755);
name += 4;

8
liblog/Android.mk
View File

@ -16,7 +16,11 @@
LOCAL_PATH := $(my-dir)
include $(CLEAR_VARS)
ifeq ($(TARGET_USES_LOGD),true)
liblog_sources := logd_write.c
else
liblog_sources := logd_write_kern.c
endif
# some files must not be compiled when building against Mingw
# they correspond to features not used by our host development tools
@ -42,7 +46,11 @@ else
endif
liblog_host_sources := $(liblog_sources) fake_log_device.c
ifeq ($(TARGET_USES_LOGD),true)
liblog_target_sources = $(liblog_sources) log_read.c
else
liblog_target_sources = $(liblog_sources) log_read_kern.c
endif
# Shared and static library for host
# ========================================================

735
liblog/log_read.c
View File

@ -14,37 +14,176 @@
** limitations under the License.
*/
#define _GNU_SOURCE /* asprintf for x86 host */
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <stddef.h>
#define NOMINMAX /* for windows to suppress definition of min in stdlib.h */
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <cutils/list.h>
#include <cutils/sockets.h>
#include <log/log.h>
#include <log/logger.h>
#include <sys/ioctl.h>
/* branchless on many architectures. */
#define min(x,y) ((y) ^ (((x) ^ (y)) & -((x) < (y))))
#define __LOGGERIO 0xAE
#define WEAK __attribute__((weak))
#define UNUSED __attribute__((unused))
#define LOGGER_GET_LOG_BUF_SIZE _IO(__LOGGERIO, 1) /* size of log */
#define LOGGER_GET_LOG_LEN _IO(__LOGGERIO, 2) /* used log len */
#define LOGGER_GET_NEXT_ENTRY_LEN _IO(__LOGGERIO, 3) /* next entry len */
#define LOGGER_FLUSH_LOG _IO(__LOGGERIO, 4) /* flush log */
#define LOGGER_GET_VERSION _IO(__LOGGERIO, 5) /* abi version */
#define LOGGER_SET_VERSION _IO(__LOGGERIO, 6) /* abi version */
/* Private copy of ../libcutils/socket_local_client.c prevent library loops */
typedef char bool;
#define false (const bool)0
#define true (const bool)1
#ifdef HAVE_WINSOCK
#define LOG_FILE_DIR "/dev/log/"
int WEAK socket_local_client(const char *name, int namespaceId, int type)
{
errno = ENOSYS;
return -ENOSYS;
}
/* timeout in milliseconds */
#define LOG_TIMEOUT_FLUSH 5
#define LOG_TIMEOUT_NEVER -1
#else /* !HAVE_WINSOCK */
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <sys/types.h>
/* Private copy of ../libcutils/socket_local.h prevent library loops */
#define FILESYSTEM_SOCKET_PREFIX "/tmp/"
#define ANDROID_RESERVED_SOCKET_PREFIX "/dev/socket/"
/* End of ../libcutils/socket_local.h */
#define LISTEN_BACKLOG 4
/* Documented in header file. */
int WEAK socket_make_sockaddr_un(const char *name, int namespaceId,
struct sockaddr_un *p_addr, socklen_t *alen)
{
memset (p_addr, 0, sizeof (*p_addr));
size_t namelen;
switch (namespaceId) {
case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
#ifdef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
namelen = strlen(name);
/* Test with length +1 for the *initial* '\0'. */
if ((namelen + 1) > sizeof(p_addr->sun_path)) {
goto error;
}
/*
* Note: The path in this case is *not* supposed to be
* '\0'-terminated. ("man 7 unix" for the gory details.)
*/
p_addr->sun_path[0] = 0;
memcpy(p_addr->sun_path + 1, name, namelen);
#else /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
/* this OS doesn't have the Linux abstract namespace */
namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
#endif /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
break;
case ANDROID_SOCKET_NAMESPACE_RESERVED:
namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
break;
case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
namelen = strlen(name);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, name);
break;
default:
/* invalid namespace id */
return -1;
}
p_addr->sun_family = AF_LOCAL;
*alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
return 0;
error:
return -1;
}
/**
* connect to peer named "name" on fd
* returns same fd or -1 on error.
* fd is not closed on error. that's your job.
*
* Used by AndroidSocketImpl
*/
int WEAK socket_local_client_connect(int fd, const char *name, int namespaceId,
int type UNUSED)
{
struct sockaddr_un addr;
socklen_t alen;
size_t namelen;
int err;
err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
if (err < 0) {
goto error;
}
if(connect(fd, (struct sockaddr *) &addr, alen) < 0) {
goto error;
}
return fd;
error:
return -1;
}
/**
* connect to peer named "name"
* returns fd or -1 on error
*/
int WEAK socket_local_client(const char *name, int namespaceId, int type)
{
int s;
s = socket(AF_LOCAL, type, 0);
if(s < 0) return -1;
if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) {
close(s);
return -1;
}
return s;
}
#endif /* !HAVE_WINSOCK */
/* End of ../libcutils/socket_local_client.c */
#define logger_for_each(logger, logger_list) \
for (logger = node_to_item((logger_list)->node.next, struct logger, node); \
@ -59,44 +198,17 @@ static const char *LOG_NAME[LOG_ID_MAX] = {
[LOG_ID_SYSTEM] = "system"
};
const char *android_log_id_to_name(log_id_t log_id) {
const 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];
}
static int accessmode(int mode)
log_id_t android_name_to_log_id(const char *logName)
{
if ((mode & O_ACCMODE) == O_WRONLY) {
return W_OK;
}
if ((mode & O_ACCMODE) == O_RDWR) {
return R_OK | W_OK;
}
return R_OK;
}
/* repeated fragment */
static int check_allocate_accessible(char **n, const char *b, int mode)
{
*n = NULL;
if (!b) {
return -EINVAL;
}
asprintf(n, LOG_FILE_DIR "%s", b);
if (!*n) {
return -1;
}
return access(*n, accessmode(mode));
}
log_id_t android_name_to_log_id(const char *logName) {
const char *b;
char *n;
int ret;
if (!logName) {
@ -109,12 +221,6 @@ log_id_t android_name_to_log_id(const char *logName) {
++b;
}
ret = check_allocate_accessible(&n, b, O_RDONLY);
free(n);
if (ret) {
return ret;
}
for(ret = LOG_ID_MIN; ret < LOG_ID_MAX; ++ret) {
const char *l = LOG_NAME[ret];
if (l && !strcmp(b, l)) {
@ -129,26 +235,13 @@ struct logger_list {
int mode;
unsigned int tail;
pid_t pid;
unsigned int queued_lines;
int timeout_ms;
int error;
bool flush;
bool valid_entry; /* valiant(?) effort to deal with memory starvation */
struct log_msg entry;
};
struct log_list {
struct listnode node;
struct log_msg entry; /* Truncated to event->len() + 1 to save space */
int sock;
};
struct logger {
struct listnode node;
struct logger_list *top;
int fd;
log_id_t id;
short *revents;
struct listnode log_list;
};
/* android_logger_alloc unimplemented, no use case */
@ -159,73 +252,81 @@ static void android_logger_free(struct logger *logger)
return;
}
while (!list_empty(&logger->log_list)) {
struct log_list *entry = node_to_item(
list_head(&logger->log_list), struct log_list, node);
list_remove(&entry->node);
free(entry);
if (logger->top->queued_lines) {
logger->top->queued_lines--;
}
}
if (logger->fd >= 0) {
close(logger->fd);
}
list_remove(&logger->node);
free(logger);
}
/* android_logger_alloc unimplemented, no use case */
/* method for getting the associated sublog id */
log_id_t android_logger_get_id(struct logger *logger)
{
return logger->id;
}
/* worker for sending the command to the logger */
static int logger_ioctl(struct logger *logger, int cmd, int mode)
static ssize_t send_log_msg(struct logger *logger,
const char *msg, char *buf, size_t buf_size)
{
char *n;
int f, ret;
if (!logger || !logger->top) {
return -EFAULT;
ssize_t ret;
int sock = socket_local_client("logd", ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM);
if (sock < 0) {
ret = sock;
goto done;
}
if (((mode & O_ACCMODE) == O_RDWR)
|| (((mode ^ logger->top->mode) & O_ACCMODE) == 0)) {
return ioctl(logger->fd, cmd);
if (msg) {
snprintf(buf, buf_size, msg, logger ? logger->id : (unsigned) -1);
}
/* We go here if android_logger_list_open got mode wrong for this ioctl */
ret = check_allocate_accessible(&n, android_log_id_to_name(logger->id), mode);
if (ret) {
free(n);
return ret;
ret = write(sock, buf, strlen(buf) + 1);
if (ret <= 0) {
goto done;
}
f = open(n, mode);
free(n);
if (f < 0) {
return f;
ret = read(sock, buf, buf_size);
done:
if ((ret == -1) && errno) {
ret = -errno;
}
ret = ioctl(f, cmd);
close (f);
close(sock);
return ret;
}
int android_logger_clear(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_FLUSH_LOG, O_WRONLY);
char buf[512];
ssize_t ret = send_log_msg(logger, "clear %d", buf, sizeof(buf));
if (ret < 0) {
return ret;
}
if (strncmp(buf, "success", 7)) {
return -1;
}
return 0;
}
/* returns the total size of the log's ring buffer */
int android_logger_get_log_size(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_GET_LOG_BUF_SIZE, O_RDWR);
char buf[512];
ssize_t ret = send_log_msg(logger, "getLogSize %d", buf, sizeof(buf));
if (ret < 0) {
return ret;
}
if ((buf[0] < '0') || ('9' < buf[0])) {
return -1;
}
return atoi(buf);
}
/*
@ -234,16 +335,26 @@ int android_logger_get_log_size(struct logger *logger)
*/
int android_logger_get_log_readable_size(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_GET_LOG_LEN, O_RDONLY);
char buf[512];
ssize_t ret = send_log_msg(logger, "getLogSizeUsed %d", buf, sizeof(buf));
if (ret < 0) {
return ret;
}
if ((buf[0] < '0') || ('9' < buf[0])) {
return -1;
}
return atoi(buf);
}
/*
* returns the logger version
*/
int android_logger_get_log_version(struct logger *logger)
int android_logger_get_log_version(struct logger *logger UNUSED)
{
int ret = logger_ioctl(logger, LOGGER_GET_VERSION, O_RDWR);
return (ret < 0) ? 1 : ret;
return 3;
}
struct logger_list *android_logger_list_alloc(int mode,
@ -256,10 +367,13 @@ struct logger_list *android_logger_list_alloc(int mode,
if (!logger_list) {
return NULL;
}
list_init(&logger_list->node);
logger_list->mode = mode;
logger_list->tail = tail;
logger_list->pid = pid;
logger_list->sock = -1;
return logger_list;
}
@ -289,28 +403,11 @@ struct logger *android_logger_open(struct logger_list *logger_list,
goto err;
}
if (check_allocate_accessible(&n, android_log_id_to_name(id),
logger_list->mode)) {
goto err_name;
}
logger->fd = open(n, logger_list->mode);
if (logger->fd < 0) {
goto err_name;
}
free(n);
logger->id = id;
list_init(&logger->log_list);
list_add_tail(&logger_list->node, &logger->node);
logger->top = logger_list;
logger_list->timeout_ms = LOG_TIMEOUT_FLUSH;
goto ok;
err_name:
free(n);
err_logger:
free(logger);
err:
logger = NULL;
ok:
@ -336,315 +433,137 @@ struct logger_list *android_logger_list_open(log_id_t id,
return logger_list;
}
/* prevent memory starvation when backfilling */
static unsigned int queue_threshold(struct logger_list *logger_list)
static void caught_signal(int signum UNUSED)
{
return (logger_list->tail < 64) ? 64 : logger_list->tail;
}
static bool low_queue(struct listnode *node)
{
/* low is considered less than 2 */
return list_head(node) == list_tail(node);
}
/* Flush queues in sequential order, one at a time */
static int android_logger_list_flush(struct logger_list *logger_list,
struct log_msg *log_msg)
{
int ret = 0;
struct log_list *firstentry = NULL;
while ((ret == 0)
&& (logger_list->flush
|| (logger_list->queued_lines > logger_list->tail))) {
struct logger *logger;
/* Merge sort */
bool at_least_one_is_low = false;
struct logger *firstlogger = NULL;
firstentry = NULL;
logger_for_each(logger, logger_list) {
struct listnode *node;
struct log_list *oldest = NULL;
/* kernel logger channels not necessarily time-sort order */
list_for_each(node, &logger->log_list) {
struct log_list *entry = node_to_item(node,
struct log_list, node);
if (!oldest
|| (entry->entry.entry.sec < oldest->entry.entry.sec)
|| ((entry->entry.entry.sec == oldest->entry.entry.sec)
&& (entry->entry.entry.nsec < oldest->entry.entry.nsec))) {
oldest = entry;
}
}
if (!oldest) {
at_least_one_is_low = true;
continue;
} else if (low_queue(&logger->log_list)) {
at_least_one_is_low = true;
}
if (!firstentry
|| (oldest->entry.entry.sec < firstentry->entry.entry.sec)
|| ((oldest->entry.entry.sec == firstentry->entry.entry.sec)
&& (oldest->entry.entry.nsec < firstentry->entry.entry.nsec))) {
firstentry = oldest;
firstlogger = logger;
}
}
if (!firstentry) {
break;
}
/* when trimming list, tries to keep one entry behind in each bucket */
if (!logger_list->flush
&& at_least_one_is_low
&& (logger_list->queued_lines < queue_threshold(logger_list))) {
break;
}
/* within tail?, send! */
if ((logger_list->tail == 0)
|| (logger_list->queued_lines <= logger_list->tail)) {
ret = firstentry->entry.entry.hdr_size;
if (!ret) {
ret = sizeof(firstentry->entry.entry_v1);
}
ret += firstentry->entry.entry.len;
memcpy(log_msg->buf, firstentry->entry.buf, ret + 1);
log_msg->extra.id = firstlogger->id;
}
/* next entry */
list_remove(&firstentry->node);
free(firstentry);
if (logger_list->queued_lines) {
logger_list->queued_lines--;
}
}
/* Flushed the list, no longer in tail mode for continuing content */
if (logger_list->flush && !firstentry) {
logger_list->tail = 0;
}
return ret;
}
/* Read from the selected logs */
int android_logger_list_read(struct logger_list *logger_list,
struct log_msg *log_msg)
{
int ret, e;
struct logger *logger;
nfds_t nfds;
struct pollfd *p, *pollfds = NULL;
int error = 0, ret = 0;
memset(log_msg, 0, sizeof(struct log_msg));
struct sigaction ignore;
struct sigaction old_sigaction;
unsigned int old_alarm = 0;
if (!logger_list) {
return -ENODEV;
return -EINVAL;
}
if (!(accessmode(logger_list->mode) & R_OK)) {
logger_list->error = EPERM;
goto done;
if (logger_list->mode & O_NONBLOCK) {
memset(&ignore, 0, sizeof(ignore));
ignore.sa_handler = caught_signal;
sigemptyset(&ignore.sa_mask);
}
nfds = 0;
logger_for_each(logger, logger_list) {
++nfds;
}
if (nfds <= 0) {
error = ENODEV;
goto done;
}
if (logger_list->sock < 0) {
char buffer[256], *cp, c;
/* Do we have anything to offer from the buffer or state? */
if (logger_list->valid_entry) { /* implies we are also in a flush state */
goto flush;
}
ret = android_logger_list_flush(logger_list, log_msg);
if (ret) {
goto done;
}
if (logger_list->error) { /* implies we are also in a flush state */
goto done;
}
/* Lets start grinding on metal */
pollfds = calloc(nfds, sizeof(struct pollfd));
if (!pollfds) {
error = ENOMEM;
goto flush;
}
p = pollfds;
logger_for_each(logger, logger_list) {
p->fd = logger->fd;
p->events = POLLIN;
logger->revents = &p->revents;
++p;
}
while (!ret && !error) {
int result;
/* If we oversleep it's ok, i.e. ignore EINTR. */
result = TEMP_FAILURE_RETRY(
poll(pollfds, nfds, logger_list->timeout_ms));
if (result <= 0) {
if (result) {
error = errno;
} else if (logger_list->mode & O_NDELAY) {
error = EAGAIN;
} else {
logger_list->timeout_ms = LOG_TIMEOUT_NEVER;
int sock = socket_local_client("logdr",
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_SEQPACKET);
if (sock < 0) {
if ((sock == -1) && errno) {
return -errno;
}
logger_list->flush = true;
goto try_flush;
return sock;
}
logger_list->timeout_ms = LOG_TIMEOUT_FLUSH;
/* Anti starvation */
if (!logger_list->flush
&& (logger_list->queued_lines > (queue_threshold(logger_list) / 2))) {
/* Any queues with input pending that is low? */
bool starving = false;
logger_for_each(logger, logger_list) {
if ((*(logger->revents) & POLLIN)
&& low_queue(&logger->log_list)) {
starving = true;
break;
}
}
/* pushback on any queues that are not low */
if (starving) {
logger_for_each(logger, logger_list) {
if ((*(logger->revents) & POLLIN)
&& !low_queue(&logger->log_list)) {
*(logger->revents) &= ~POLLIN;
}
}
}
}
strcpy(buffer,
(logger_list->mode & O_NONBLOCK) ? "dumpAndClose" : "stream");
cp = buffer + strlen(buffer);
strcpy(cp, " lids");
cp += 5;
c = '=';
int remaining = sizeof(buffer) - (cp - buffer);
logger_for_each(logger, logger_list) {
unsigned int hdr_size;
struct log_list *entry;
ret = snprintf(cp, remaining, "%c%u", c, logger->id);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
c = ',';
}
if (!(*(logger->revents) & POLLIN)) {
continue;
if (logger_list->tail) {
ret = snprintf(cp, remaining, " tail=%u", logger_list->tail);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
}
if (logger_list->pid) {
ret = snprintf(cp, remaining, " pid=%u", logger_list->pid);
ret = min(ret, remaining);
remaining -= ret;
cp += ret;
}
if (logger_list->mode & O_NONBLOCK) {
/* Deal with an unresponsive logd */
sigaction(SIGALRM, &ignore, &old_sigaction);
old_alarm = alarm(30);
}
ret = write(sock, buffer, cp - buffer);
e = errno;
if (logger_list->mode & O_NONBLOCK) {
if (e == EINTR) {
e = ETIMEDOUT;
}
memset(logger_list->entry.buf, 0, sizeof(struct log_msg));
/* NOTE: driver guarantees we read exactly one full entry */
result = read(logger->fd, logger_list->entry.buf,
LOGGER_ENTRY_MAX_LEN);
if (result <= 0) {
if (!result) {
error = EIO;
} else if (errno != EINTR) {
error = errno;
}
continue;
}
if (logger_list->pid
&& (logger_list->pid != logger_list->entry.entry.pid)) {
continue;
}
hdr_size = logger_list->entry.entry.hdr_size;
if (!hdr_size) {
hdr_size = sizeof(logger_list->entry.entry_v1);
}
if ((hdr_size > sizeof(struct log_msg))
|| (logger_list->entry.entry.len
> sizeof(logger_list->entry.buf) - hdr_size)
|| (logger_list->entry.entry.len != result - hdr_size)) {
error = EINVAL;
continue;
}
logger_list->entry.extra.id = logger->id;
/* speedup: If not tail, and only one list, send directly */
if (!logger_list->tail
&& (list_head(&logger_list->node)
== list_tail(&logger_list->node))) {
ret = result;
memcpy(log_msg->buf, logger_list->entry.buf, result + 1);
log_msg->extra.id = logger->id;
break;
}
entry = malloc(sizeof(*entry) - sizeof(entry->entry) + result + 1);
if (!entry) {
logger_list->valid_entry = true;
error = ENOMEM;
break;
}
logger_list->queued_lines++;
memcpy(entry->entry.buf, logger_list->entry.buf, result);
entry->entry.buf[result] = '\0';
list_add_tail(&logger->log_list, &entry->node);
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, NULL);
}
if (ret <= 0) {
try_flush:
ret = android_logger_list_flush(logger_list, log_msg);
}
}
free(pollfds);
flush:
if (error) {
logger_list->flush = true;
}
if (ret <= 0) {
ret = android_logger_list_flush(logger_list, log_msg);
if (!ret && logger_list->valid_entry) {
ret = logger_list->entry.entry.hdr_size;
if (!ret) {
ret = sizeof(logger_list->entry.entry_v1);
close(sock);
if ((ret == -1) && e) {
return -e;
}
ret += logger_list->entry.entry.len;
memcpy(log_msg->buf, logger_list->entry.buf,
sizeof(struct log_msg));
logger_list->valid_entry = false;
if (ret == 0) {
return -EIO;
}
return ret;
}
logger_list->sock = sock;
}
done:
if (logger_list->error) {
error = logger_list->error;
}
if (error) {
logger_list->error = error;
if (!ret) {
ret = -error;
ret = 0;
while(1) {
memset(log_msg, 0, sizeof(*log_msg));
if (logger_list->mode & O_NONBLOCK) {
/* particularily useful if tombstone is reporting for logd */
sigaction(SIGALRM, &ignore, &old_sigaction);
old_alarm = alarm(30);
}
/* NOTE: SOCK_SEQPACKET guarantees we read exactly one full entry */
ret = recv(logger_list->sock, log_msg, LOGGER_ENTRY_MAX_LEN, 0);
e = errno;
if (logger_list->mode & O_NONBLOCK) {
if ((ret == 0) || (e == EINTR)) {
e = EAGAIN;
ret = -1;
}
alarm(old_alarm);
sigaction(SIGALRM, &old_sigaction, NULL);
}
if (ret <= 0) {
if ((ret == -1) && e) {
return -e;
}
return ret;
}
logger_for_each(logger, logger_list) {
if (log_msg->entry.lid == logger->id) {
return ret;
}
}
}
/* NOTREACH */
return ret;
}
@ -661,5 +580,9 @@ void android_logger_list_free(struct logger_list *logger_list)
android_logger_free(logger);
}
if (logger_list->sock >= 0) {
close (logger_list->sock);
}
free(logger_list);
}

695
liblog/log_read_kern.c Normal file
View File

@ -0,0 +1,695 @@
/*
** Copyright 2013-2014, 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.
*/
#define _GNU_SOURCE /* asprintf for x86 host */
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <cutils/list.h>
#include <log/log.h>
#include <log/logger.h>
#include <sys/ioctl.h>
#define __LOGGERIO 0xAE
#define LOGGER_GET_LOG_BUF_SIZE _IO(__LOGGERIO, 1) /* size of log */
#define LOGGER_GET_LOG_LEN _IO(__LOGGERIO, 2) /* used log len */
#define LOGGER_GET_NEXT_ENTRY_LEN _IO(__LOGGERIO, 3) /* next entry len */
#define LOGGER_FLUSH_LOG _IO(__LOGGERIO, 4) /* flush log */
#define LOGGER_GET_VERSION _IO(__LOGGERIO, 5) /* abi version */
#define LOGGER_SET_VERSION _IO(__LOGGERIO, 6) /* abi version */
typedef char bool;
#define false (const bool)0
#define true (const bool)1
#define LOG_FILE_DIR "/dev/log/"
/* timeout in milliseconds */
#define LOG_TIMEOUT_FLUSH 5
#define LOG_TIMEOUT_NEVER -1
#define logger_for_each(logger, logger_list) \
for (logger = node_to_item((logger_list)->node.next, struct logger, node); \
logger != node_to_item(&(logger_list)->node, struct logger, node); \
logger = node_to_item((logger)->node.next, struct logger, node))
/* In the future, we would like to make this list extensible */
static const char *LOG_NAME[LOG_ID_MAX] = {
[LOG_ID_MAIN] = "main",
[LOG_ID_RADIO] = "radio",
[LOG_ID_EVENTS] = "events",
[LOG_ID_SYSTEM] = "system"
};
const 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];
}
static int accessmode(int mode)
{
if ((mode & O_ACCMODE) == O_WRONLY) {
return W_OK;
}
if ((mode & O_ACCMODE) == O_RDWR) {
return R_OK | W_OK;
}
return R_OK;
}
/* repeated fragment */
static int check_allocate_accessible(char **n, const char *b, int mode)
{
*n = NULL;
if (!b) {
return -EINVAL;
}
asprintf(n, LOG_FILE_DIR "%s", b);
if (!*n) {
return -1;
}
return access(*n, accessmode(mode));
}
log_id_t android_name_to_log_id(const char *logName)
{
const char *b;
char *n;
int ret;
if (!logName) {
return -1; /* NB: log_id_t is unsigned */
}
b = strrchr(logName, '/');
if (!b) {
b = logName;
} else {
++b;
}
ret = check_allocate_accessible(&n, b, O_RDONLY);
free(n);
if (ret) {
return ret;
}
for(ret = LOG_ID_MIN; ret < LOG_ID_MAX; ++ret) {
const char *l = LOG_NAME[ret];
if (l && !strcmp(b, l)) {
return ret;
}
}
return -1; /* should never happen */
}
struct logger_list {
struct listnode node;
int mode;
unsigned int tail;
pid_t pid;
unsigned int queued_lines;
int timeout_ms;
int error;
bool flush;
bool valid_entry; /* valiant(?) effort to deal with memory starvation */
struct log_msg entry;
};
struct log_list {
struct listnode node;
struct log_msg entry; /* Truncated to event->len() + 1 to save space */
};
struct logger {
struct listnode node;
struct logger_list *top;
int fd;
log_id_t id;
short *revents;
struct listnode log_list;
};
/* android_logger_alloc unimplemented, no use case */
/* android_logger_free not exported */
static void android_logger_free(struct logger *logger)
{
if (!logger) {
return;
}
while (!list_empty(&logger->log_list)) {
struct log_list *entry = node_to_item(
list_head(&logger->log_list), struct log_list, node);
list_remove(&entry->node);
free(entry);
if (logger->top->queued_lines) {
logger->top->queued_lines--;
}
}
if (logger->fd >= 0) {
close(logger->fd);
}
list_remove(&logger->node);
free(logger);
}
log_id_t android_logger_get_id(struct logger *logger)
{
return logger->id;
}
/* worker for sending the command to the logger */
static int logger_ioctl(struct logger *logger, int cmd, int mode)
{
char *n;
int f, ret;
if (!logger || !logger->top) {
return -EFAULT;
}
if (((mode & O_ACCMODE) == O_RDWR)
|| (((mode ^ logger->top->mode) & O_ACCMODE) == 0)) {
return ioctl(logger->fd, cmd);
}
/* We go here if android_logger_list_open got mode wrong for this ioctl */
ret = check_allocate_accessible(&n, android_log_id_to_name(logger->id), mode);
if (ret) {
free(n);
return ret;
}
f = open(n, mode);
free(n);
if (f < 0) {
return f;
}
ret = ioctl(f, cmd);
close (f);
return ret;
}
int android_logger_clear(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_FLUSH_LOG, O_WRONLY);
}
/* returns the total size of the log's ring buffer */
int android_logger_get_log_size(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_GET_LOG_BUF_SIZE, O_RDWR);
}
/*
* returns the readable size of the log's ring buffer (that is, amount of the
* log consumed)
*/
int android_logger_get_log_readable_size(struct logger *logger)
{
return logger_ioctl(logger, LOGGER_GET_LOG_LEN, O_RDONLY);
}
/*
* returns the logger version
*/
int android_logger_get_log_version(struct logger *logger)
{
int ret = logger_ioctl(logger, LOGGER_GET_VERSION, O_RDWR);
return (ret < 0) ? 1 : ret;
}
struct logger_list *android_logger_list_alloc(int mode,
unsigned int tail,
pid_t pid)
{
struct logger_list *logger_list;
logger_list = calloc(1, sizeof(*logger_list));
if (!logger_list) {
return NULL;
}
list_init(&logger_list->node);
logger_list->mode = mode;
logger_list->tail = tail;
logger_list->pid = pid;
return logger_list;
}
/* android_logger_list_register unimplemented, no use case */
/* android_logger_list_unregister unimplemented, no use case */
/* Open the named log and add it to the logger list */
struct logger *android_logger_open(struct logger_list *logger_list,
log_id_t id)
{
struct listnode *node;
struct logger *logger;
char *n;
if (!logger_list || (id >= LOG_ID_MAX)) {
goto err;
}
logger_for_each(logger, logger_list) {
if (logger->id == id) {
goto ok;
}
}
logger = calloc(1, sizeof(*logger));
if (!logger) {
goto err;
}
if (check_allocate_accessible(&n, android_log_id_to_name(id),
logger_list->mode)) {
goto err_name;
}
logger->fd = open(n, logger_list->mode);
if (logger->fd < 0) {
goto err_name;
}
free(n);
logger->id = id;
list_init(&logger->log_list);
list_add_tail(&logger_list->node, &logger->node);
logger->top = logger_list;
logger_list->timeout_ms = LOG_TIMEOUT_FLUSH;
goto ok;
err_name:
free(n);
err_logger:
free(logger);
err:
logger = NULL;
ok:
return logger;
}
/* Open the single named log and make it part of a new logger list */
struct logger_list *android_logger_list_open(log_id_t id,
int mode,
unsigned int tail,
pid_t pid)
{
struct logger_list *logger_list = android_logger_list_alloc(mode, tail, pid);
if (!logger_list) {
return NULL;
}
if (!android_logger_open(logger_list, id)) {
android_logger_list_free(logger_list);
return NULL;
}
return logger_list;
}
/* prevent memory starvation when backfilling */
static unsigned int queue_threshold(struct logger_list *logger_list)
{
return (logger_list->tail < 64) ? 64 : logger_list->tail;
}
static bool low_queue(struct listnode *node)
{
/* low is considered less than 2 */
return list_head(node) == list_tail(node);
}
/* Flush queues in sequential order, one at a time */
static int android_logger_list_flush(struct logger_list *logger_list,
struct log_msg *log_msg)
{
int ret = 0;
struct log_list *firstentry = NULL;
while ((ret == 0)
&& (logger_list->flush
|| (logger_list->queued_lines > logger_list->tail))) {
struct logger *logger;
/* Merge sort */
bool at_least_one_is_low = false;
struct logger *firstlogger = NULL;
firstentry = NULL;
logger_for_each(logger, logger_list) {
struct listnode *node;
struct log_list *oldest = NULL;
/* kernel logger channels not necessarily time-sort order */
list_for_each(node, &logger->log_list) {
struct log_list *entry = node_to_item(node,
struct log_list, node);
if (!oldest
|| (entry->entry.entry.sec < oldest->entry.entry.sec)
|| ((entry->entry.entry.sec == oldest->entry.entry.sec)
&& (entry->entry.entry.nsec < oldest->entry.entry.nsec))) {
oldest = entry;
}
}
if (!oldest) {
at_least_one_is_low = true;
continue;
} else if (low_queue(&logger->log_list)) {
at_least_one_is_low = true;
}
if (!firstentry
|| (oldest->entry.entry.sec < firstentry->entry.entry.sec)
|| ((oldest->entry.entry.sec == firstentry->entry.entry.sec)
&& (oldest->entry.entry.nsec < firstentry->entry.entry.nsec))) {
firstentry = oldest;
firstlogger = logger;
}
}
if (!firstentry) {
break;
}
/* when trimming list, tries to keep one entry behind in each bucket */
if (!logger_list->flush
&& at_least_one_is_low
&& (logger_list->queued_lines < queue_threshold(logger_list))) {
break;
}
/* within tail?, send! */
if ((logger_list->tail == 0)
|| (logger_list->queued_lines <= logger_list->tail)) {
int diff;
ret = firstentry->entry.entry.hdr_size;
if (!ret) {
ret = sizeof(firstentry->entry.entry_v1);
}
/* Promote entry to v3 format */
memcpy(log_msg->buf, firstentry->entry.buf, ret);
diff = sizeof(firstentry->entry.entry_v3) - ret;
if (diff < 0) {
diff = 0;
} else if (diff > 0) {
memset(log_msg->buf + ret, 0, diff);
}
memcpy(log_msg->buf + ret + diff, firstentry->entry.buf + ret,
firstentry->entry.entry.len + 1);
ret += diff;
log_msg->entry.hdr_size = ret;
log_msg->entry.lid = firstlogger->id;
ret += firstentry->entry.entry.len;
}
/* next entry */
list_remove(&firstentry->node);
free(firstentry);
if (logger_list->queued_lines) {
logger_list->queued_lines--;
}
}
/* Flushed the list, no longer in tail mode for continuing content */
if (logger_list->flush && !firstentry) {
logger_list->tail = 0;
}
return ret;
}
/* Read from the selected logs */
int android_logger_list_read(struct logger_list *logger_list,
struct log_msg *log_msg)
{
struct logger *logger;
nfds_t nfds;
struct pollfd *p, *pollfds = NULL;
int error = 0, ret = 0;
memset(log_msg, 0, sizeof(struct log_msg));
if (!logger_list) {
return -ENODEV;
}
if (!(accessmode(logger_list->mode) & R_OK)) {
logger_list->error = EPERM;
goto done;
}
nfds = 0;
logger_for_each(logger, logger_list) {
++nfds;
}
if (nfds <= 0) {
error = ENODEV;
goto done;
}
/* Do we have anything to offer from the buffer or state? */
if (logger_list->valid_entry) { /* implies we are also in a flush state */
goto flush;
}
ret = android_logger_list_flush(logger_list, log_msg);
if (ret) {
goto done;
}
if (logger_list->error) { /* implies we are also in a flush state */
goto done;
}
/* Lets start grinding on metal */
pollfds = calloc(nfds, sizeof(struct pollfd));
if (!pollfds) {
error = ENOMEM;
goto flush;
}
p = pollfds;
logger_for_each(logger, logger_list) {
p->fd = logger->fd;
p->events = POLLIN;
logger->revents = &p->revents;
++p;
}
while (!ret && !error) {
int result;
/* If we oversleep it's ok, i.e. ignore EINTR. */
result = TEMP_FAILURE_RETRY(
poll(pollfds, nfds, logger_list->timeout_ms));
if (result <= 0) {
if (result) {
error = errno;
} else if (logger_list->mode & O_NDELAY) {
error = EAGAIN;
} else {
logger_list->timeout_ms = LOG_TIMEOUT_NEVER;
}
logger_list->flush = true;
goto try_flush;
}
logger_list->timeout_ms = LOG_TIMEOUT_FLUSH;
/* Anti starvation */
if (!logger_list->flush
&& (logger_list->queued_lines > (queue_threshold(logger_list) / 2))) {
/* Any queues with input pending that is low? */
bool starving = false;
logger_for_each(logger, logger_list) {
if ((*(logger->revents) & POLLIN)
&& low_queue(&logger->log_list)) {
starving = true;
break;
}
}
/* pushback on any queues that are not low */
if (starving) {
logger_for_each(logger, logger_list) {
if ((*(logger->revents) & POLLIN)
&& !low_queue(&logger->log_list)) {
*(logger->revents) &= ~POLLIN;
}
}
}
}
logger_for_each(logger, logger_list) {
unsigned int hdr_size;
struct log_list *entry;
int diff;
if (!(*(logger->revents) & POLLIN)) {
continue;
}
memset(logger_list->entry.buf, 0, sizeof(struct log_msg));
/* NOTE: driver guarantees we read exactly one full entry */
result = read(logger->fd, logger_list->entry.buf,
LOGGER_ENTRY_MAX_LEN);
if (result <= 0) {
if (!result) {
error = EIO;
} else if (errno != EINTR) {
error = errno;
}
continue;
}
if (logger_list->pid
&& (logger_list->pid != logger_list->entry.entry.pid)) {
continue;
}
hdr_size = logger_list->entry.entry.hdr_size;
if (!hdr_size) {
hdr_size = sizeof(logger_list->entry.entry_v1);
}
if ((hdr_size > sizeof(struct log_msg))
|| (logger_list->entry.entry.len
> sizeof(logger_list->entry.buf) - hdr_size)
|| (logger_list->entry.entry.len != result - hdr_size)) {
error = EINVAL;
continue;
}
/* Promote entry to v3 format */
diff = sizeof(logger_list->entry.entry_v3) - hdr_size;
if (diff > 0) {
if (logger_list->entry.entry.len
> sizeof(logger_list->entry.buf) - hdr_size - diff) {
error = EINVAL;
continue;
}
result += diff;
memmove(logger_list->entry.buf + hdr_size + diff,
logger_list->entry.buf + hdr_size,
logger_list->entry.entry.len + 1);
memset(logger_list->entry.buf + hdr_size, 0, diff);
logger_list->entry.entry.hdr_size = hdr_size + diff;
}
logger_list->entry.entry.lid = logger->id;
/* speedup: If not tail, and only one list, send directly */
if (!logger_list->tail
&& (list_head(&logger_list->node)
== list_tail(&logger_list->node))) {
ret = result;
memcpy(log_msg->buf, logger_list->entry.buf, result + 1);
break;
}
entry = malloc(sizeof(*entry) - sizeof(entry->entry) + result + 1);
if (!entry) {
logger_list->valid_entry = true;
error = ENOMEM;
break;
}
logger_list->queued_lines++;
memcpy(entry->entry.buf, logger_list->entry.buf, result);
entry->entry.buf[result] = '\0';
list_add_tail(&logger->log_list, &entry->node);
}
if (ret <= 0) {
try_flush:
ret = android_logger_list_flush(logger_list, log_msg);
}
}
free(pollfds);
flush:
if (error) {
logger_list->flush = true;
}
if (ret <= 0) {
ret = android_logger_list_flush(logger_list, log_msg);
if (!ret && logger_list->valid_entry) {
ret = logger_list->entry.entry.hdr_size;
if (!ret) {
ret = sizeof(logger_list->entry.entry_v1);
}
ret += logger_list->entry.entry.len;
memcpy(log_msg->buf, logger_list->entry.buf,
sizeof(struct log_msg));
logger_list->valid_entry = false;
}
}
done:
if (logger_list->error) {
error = logger_list->error;
}
if (error) {
logger_list->error = error;
if (!ret) {
ret = -error;
}
}
return ret;
}
/* Close all the logs */
void android_logger_list_free(struct logger_list *logger_list)
{
if (logger_list == NULL) {
return;
}
while (!list_empty(&logger_list->node)) {
struct listnode *node = list_head(&logger_list->node);
struct logger *logger = node_to_item(node, struct logger, node);
android_logger_free(logger);
}
free(logger_list);
}

147
liblog/logd_write.c
View File

@ -13,41 +13,34 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <time.h>
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_PTHREADS
#include <pthread.h>
#endif
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <stdarg.h>
#include <sys/types.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>
#include <log/logger.h>
#include <log/logd.h>
#include <log/log.h>
#define LOGGER_LOG_MAIN "log/main"
#define LOGGER_LOG_RADIO "log/radio"
#define LOGGER_LOG_EVENTS "log/events"
#define LOGGER_LOG_SYSTEM "log/system"
#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.
/* This will be defined when building for the host. */
#include "fake_log_device.h"
#define log_open(pathname, flags) fakeLogOpen(pathname, flags)
#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
#define log_close(filedes) fakeLogClose(filedes)
#else
#define log_open(pathname, flags) open(pathname, (flags) | O_CLOEXEC)
#define log_writev(filedes, vector, count) writev(filedes, vector, count)
#define log_close(filedes) close(filedes)
#endif
static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
@ -58,11 +51,15 @@ static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
#define UNUSED __attribute__((__unused__))
static int logd_fd = -1;
#if FAKE_LOG_DEVICE
#define WEAK __attribute__((weak))
static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1 };
#endif
/*
* This is used by the C++ code to decide if it should write logs through
* the C code. Basically, if /dev/log/... is available, we're running in
* 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 {
@ -71,7 +68,7 @@ static enum {
int __android_log_dev_available(void)
{
if (g_log_status == kLogUninitialized) {
if (access("/dev/"LOGGER_LOG_MAIN, W_OK) == 0)
if (access("/dev/socket/logdw", W_OK) == 0)
g_log_status = kLogAvailable;
else
g_log_status = kLogNotAvailable;
@ -81,13 +78,14 @@ int __android_log_dev_available(void)
}
static int __write_to_log_null(log_id_t log_fd UNUSED, struct iovec *vec UNUSED,
size_t nr UNUSED)
size_t nr UNUSED)
{
return -1;
}
static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
{
#if FAKE_LOG_DEVICE
ssize_t ret;
int log_fd;
@ -96,14 +94,63 @@ static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
} else {
return EBADF;
}
do {
ret = log_writev(log_fd, vec, nr);
ret = fakeLogWritev(log_fd, vec, nr);
} while (ret < 0 && errno == EINTR);
return ret;
#else
if (logd_fd == -1) {
return -1;
}
if (getuid() == AID_LOGD) {
/*
* ignore log messages we send to ourself.
* Such log messages are often generated by libraries we depend on
* which use standard Android logging.
*/
return 0;
}
struct iovec newVec[nr + 2];
typeof_log_id_t log_id_buf = log_id;
newVec[0].iov_base = (unsigned char *) &log_id_buf;
newVec[0].iov_len = sizeof_log_id_t;
log_time realtime_ts;
clock_gettime(CLOCK_REALTIME, &realtime_ts);
newVec[1].iov_base = (unsigned char *) &realtime_ts;
newVec[1].iov_len = sizeof(log_time);
size_t i;
for (i = 2; i < nr + 2; i++) {
newVec[i].iov_base = vec[i-2].iov_base;
newVec[i].iov_len = vec[i-2].iov_len;
}
/* The write below could be lost, but will never block. */
return writev(logd_fd, newVec, nr + 2);
#endif
}
#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"
};
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
@ -111,27 +158,35 @@ static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
#endif
if (write_to_log == __write_to_log_init) {
log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
log_fds[LOG_ID_SYSTEM] = log_open("/dev/"LOGGER_LOG_SYSTEM, O_WRONLY);
write_to_log = __write_to_log_kernel;
if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
log_fds[LOG_ID_EVENTS] < 0) {
log_close(log_fds[LOG_ID_MAIN]);
log_close(log_fds[LOG_ID_RADIO]);
log_close(log_fds[LOG_ID_EVENTS]);
log_fds[LOG_ID_MAIN] = -1;
log_fds[LOG_ID_RADIO] = -1;
log_fds[LOG_ID_EVENTS] = -1;
#if FAKE_LOG_DEVICE
int i;
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
int sock = socket(PF_UNIX, SOCK_DGRAM, 0);
if (sock != -1) {
if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1) {
/* NB: Loss of content */
close(sock);
sock = -1;
} else {
struct sockaddr_un un;
memset(&un, 0, sizeof(struct sockaddr_un));
un.sun_family = AF_UNIX;
strcpy(un.sun_path, "/dev/socket/logdw");
connect(sock, (struct sockaddr *)&un, sizeof(struct sockaddr_un));
}
} else {
write_to_log = __write_to_log_null;
}
if (log_fds[LOG_ID_SYSTEM] < 0) {
log_fds[LOG_ID_SYSTEM] = log_fds[LOG_ID_MAIN];
}
logd_fd = sock;
#endif
}
#ifdef HAVE_PTHREADS
@ -288,7 +343,7 @@ int __android_log_bwrite(int32_t tag, const void *payload, size_t len)
* 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)
size_t len)
{
struct iovec vec[3];

304
liblog/logd_write_kern.c Normal file
View File

@ -0,0 +1,304 @@
/*
* 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>
#include <time.h>
#include <unistd.h>
#include <log/log.h>
#include <log/logd.h>
#include <log/logger.h>
#define LOGGER_LOG_MAIN "log/main"
#define LOGGER_LOG_RADIO "log/radio"
#define LOGGER_LOG_EVENTS "log/events"
#define LOGGER_LOG_SYSTEM "log/system"
#define LOG_BUF_SIZE 1024
#if FAKE_LOG_DEVICE
/* This will be defined when building for the host. */
#include "fake_log_device.h"
#define log_open(pathname, flags) fakeLogOpen(pathname, flags)
#define log_writev(filedes, vector, count) fakeLogWritev(filedes, vector, count)
#define log_close(filedes) fakeLogClose(filedes)
#else
#define log_open(pathname, flags) open(pathname, (flags) | O_CLOEXEC)
#define log_writev(filedes, vector, count) writev(filedes, vector, count)
#define log_close(filedes) close(filedes)
#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
#define UNUSED __attribute__((__unused__))
static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1 };
/*
* This is used by the C++ code to decide if it should write logs through
* the C code. Basically, if /dev/log/... 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/"LOGGER_LOG_MAIN, W_OK) == 0)
g_log_status = kLogAvailable;
else
g_log_status = kLogNotAvailable;
}
return (g_log_status == kLogAvailable);
}
static int __write_to_log_null(log_id_t log_fd UNUSED, struct iovec *vec UNUSED,
size_t nr UNUSED)
{
return -1;
}
static int __write_to_log_kernel(log_id_t log_id, struct iovec *vec, size_t nr)
{
ssize_t ret;
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 = log_writev(log_fd, vec, nr);
} while (ret < 0 && errno == EINTR);
return ret;
}
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) {
log_fds[LOG_ID_MAIN] = log_open("/dev/"LOGGER_LOG_MAIN, O_WRONLY);
log_fds[LOG_ID_RADIO] = log_open("/dev/"LOGGER_LOG_RADIO, O_WRONLY);
log_fds[LOG_ID_EVENTS] = log_open("/dev/"LOGGER_LOG_EVENTS, O_WRONLY);
log_fds[LOG_ID_SYSTEM] = log_open("/dev/"LOGGER_LOG_SYSTEM, O_WRONLY);
write_to_log = __write_to_log_kernel;
if (log_fds[LOG_ID_MAIN] < 0 || log_fds[LOG_ID_RADIO] < 0 ||
log_fds[LOG_ID_EVENTS] < 0) {
log_close(log_fds[LOG_ID_MAIN]);
log_close(log_fds[LOG_ID_RADIO]);
log_close(log_fds[LOG_ID_EVENTS]);
log_fds[LOG_ID_MAIN] = -1;
log_fds[LOG_ID_RADIO] = -1;
log_fds[LOG_ID_EVENTS] = -1;
write_to_log = __write_to_log_null;
}
if (log_fds[LOG_ID_SYSTEM] < 0) {
log_fds[LOG_ID_SYSTEM] = log_fds[LOG_ID_MAIN];
}
}
#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;
}
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 */
}
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);
}

3
logd/Android.mk
View File

@ -1,3 +1,5 @@
ifeq ($(TARGET_USES_LOGD),true)
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
@ -24,3 +26,4 @@ LOCAL_MODULE_TAGS := optional
include $(BUILD_EXECUTABLE)
endif # TARGET_USES_LOGD