adb logcat 打印内核消息
在默认情况下,adb logcat只能显示应用程序的调试信息,我把logcat.cpp修改了一下,让它同时可以打印内核调试信息:
修改的文件:system/core/logcat/logcat.cpp
1、首先先加入头文件
#include <sys/klog.h> //add by
2、定义所使用的TAG
#define KERNEL_TAG "Kernel"
3、替换readLogLines函数
static void readLogLines(log_device_t* devices)
{
log_device_t* dev;
int max = 0;
int ret;
int queued_lines = 0;
bool sleep = true;
char buffer[256] = {0}; //add by zhaofei
int result;
fd_set readset;
for (dev=devices; dev; dev = dev->next) {
if (dev->fd > max) {
max = dev->fd;
}
}
while (1) {
do {
timeval timeout = { 0, 5000 /* 5ms */ }; // If we oversleep it's ok, i.e. ignore EINTR.
FD_ZERO(&readset);
for (dev=devices; dev; dev = dev->next) {
FD_SET(dev->fd, &readset);
}
result = select(max + 1, &readset, NULL, NULL, sleep ? NULL : &timeout);
} while (result == -1 && errno == EINTR);
if (result >= 0) {
for (dev=devices; dev; dev = dev->next) {
if (FD_ISSET(dev->fd, &readset)) {
queued_entry_t* entry = new queued_entry_t();
/* NOTE: driver guarantees we read exactly one full entry */
ret = read(dev->fd, entry->buf, LOGGER_ENTRY_MAX_LEN);
if (ret < 0) {
if (errno == EINTR) {
delete entry;
goto next;
}
if (errno == EAGAIN) {
delete entry;
break;
}
perror("logcat read");
exit(EXIT_FAILURE);
}
else if (!ret) {
fprintf(stderr, "read: Unexpected EOF!\n");
exit(EXIT_FAILURE);
}
entry->entry.msg[entry->entry.len] = '\0';
dev->enqueue(entry);
++queued_lines;
#if 1 //read kernel log
if((ret = klogctl(9, buffer, sizeof(buffer))) > 0) {
if((ret = klogctl(2, buffer, sizeof(buffer))) > 0) {
entry->entry.tid = 0;
entry->entry.pid = getpid();
/*priority*/
entry->entry.msg[0] = Android_LOG_INFO;
/*tag*/
strcpy(entry->entry
补充:移动开发 , Android ,