当前位置:操作系统 > 安卓/Android >>

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 ,
CopyRight © 2022 站长资源库 编程知识问答 zzzyk.com All Rights Reserved
部分文章来自网络,