增加将log信息存入/data/中的功能

来源：互联网发布：linux 命令行浏览器编辑：程序博客网时间：2024/06/14 17:06

1源码在system/extras/test/rec-kmsg/main.c

2修改system/extras/test/rec-kmsg/Android.mk

将LOCAL_MODULE_TAGS := optional

修改为LOCAL_MODULE_TAGS := optional eng

因为前者生成的文件rec-kmsg只存于out/target/product/ msm8660_surf/symbols/system中，加了eng之后，还存于out/target/product/ msm8660_surf/system中。

LOCAL_MODULE_TAGS用于指定编译android时形成的版本风格

3修改system/core/rootdir/init.rc

加入：

service rec-kmsg /system/xbin/rec-kmsg

class main

user root

则在系统启动时，自动运行rec-kmsg。

  1 #include <stdio.h>  2 #include <unistd.h>  3 #include <fcntl.h>  4 #include <linux/ioctl.h>  5 #include <time.h>  6 #include <linux/msm_audio.h>  7 #include <pthread.h>  8 #include <sys/ioctl.h>  9 #include <string.h> 10 #include <stdlib.h> 11 #include <unistd.h> 12 #include <stdint.h> 13  14 #define CAT_BUFSIZ (4096) 15  16 static void raw_cat(void) 17 { 18     time_t now_t = time(NULL); 19     struct tm  now = *localtime(&now_t); 20     char date[32]; 21     char logcat[32]; 22     char command[256]; 23     static char *buf; 24     static char fb_buf[CAT_BUFSIZ]; 25     static size_t bsize; 26     ssize_t nr, nw, off; 27     int wfd, rfd; 28  29     /* Get day time as file name */ 30     strftime(date, 32, "/data/%Y%m%d-%H-%M-%S-kmsg", &now); 31     strftime(logcat, 32, "/data/%Y%m%d-%H-%M-%S-logcat", &now); 32     date[31] = 0; 33     logcat[31] = 0; 34     printf("%s\n", date); 35     snprintf(command, 256, "/system/bin/logcat -b main -b system -b events -b radio -v time *:v > %s&", logcat); 36  37     system(command); 38  39     /* Read fd */ 40     rfd = open("/proc/kmsg", O_RDONLY); 41     //printf("rfd = %d\n", rfd); 42  43     /* Write fd */ 44     wfd = open(date, O_RDWR|O_CREAT); 45     //wfd = open("/data/kmsg", O_RDWR|O_CREAT); 46     //printf("wfd = %d\n", wfd); 47  48     if (buf == NULL) { 49         buf = fb_buf; 50         bsize = CAT_BUFSIZ; 51     } 52  53     while ((nr = read(rfd, buf, bsize)) > 0) 54         for (off = 0; nr; nr -= nw, off += nw) 55             if ((nw = write(wfd, buf + off, (size_t)nr)) < 0) 56             { 57                 perror("write"); 58                 exit(EXIT_FAILURE); 59             } 60 } 61  62 int main(int argc, char **argv) 63 { 64     raw_cat(); 65     return 0; 66 }

system/extras/tests/rec-kmsg/Android.mk

  1 ifneq ($(TARGET_SIMULATOR),true)  2 ifeq ($(TARGET_PRODUCT),msm8660_surf)  3 LOCAL_PATH:= $(call my-dir)  4 include $(CLEAR_VARS)  5 LOCAL_SRC_FILES := \  6     main.c  7 LOCAL_MODULE := rec-kmsg  8 LOCAL_MODULE_TAGS := optional  9 LOCAL_MODULE_PATH := $(TARGET_OUT_OPTIONAL_EXECUTABLES) 10 include $(BUILD_EXECUTABLE) 11 endif  # TARGET_PRODUCT == msm8660_surf 12 endif  # TARGET_SIMULATOR != true~