Write log to usb file Flow
//===================================================================================================================
//========================================= use for debug Start =====================================================
//===================================================================================================================
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define MAX_USB_PATH (128)
void messageWrite2File(char *msg, int size);
void OMX_Logger_Print( const char *pcc8Function, const char *pcc8Format, ... );
int g_vewd_logmask = 0;
FILE *gLogMsgFile = NULL;
//FILE *gOutYUVFile = NULL;
static char outLogName[][MAX_USB_PATH] = {
"",
"/tmp/",
};
static int Detect_USBPath(char *path)
{
FILE *fmtab;
char *usb_path;
char tmpBuf[128];
memset((void*)path, 0, MAX_USB_PATH);
/* lookup Linux's table */
if ((fmtab = fopen("/etc/mtab", "r+"))!=NULL) {
while (fgets(tmpBuf, sizeof(tmpBuf), fmtab)) {
if (strncmp(tmpBuf, "/dev/sd", 7) == 0) {
char *pos = tmpBuf;
strsep(&pos, " "); //device path
usb_path = strsep(&pos, " "); //mount path
if (usb_path) {
strncpy(path, usb_path, MAX_USB_PATH - 2);
strncat(path, "/", 1);
fclose(fmtab);
return 0;
}
}
}
fclose(fmtab);
}
/* lookup Android's table */
if ((fmtab = fopen("/proc/mounts", "r+"))!= NULL) {
while (fgets(tmpBuf, sizeof(tmpBuf), fmtab)) {
if (strncmp(tmpBuf, "/dev/fuse", 9) == 0 || strncmp(tmpBuf, "/dev/sd", 7) == 0) {
char *pos = tmpBuf;
strsep(&pos, " "); //device path
usb_path = strsep(&pos, " "); //mount path
if (usb_path) {
strncpy(path, usb_path, MAX_USB_PATH - 2);
strncat(path, "/", 1);
fclose(fmtab);
return 0;
}
}
}
fclose(fmtab);
}
return 1;
}
void vewd_dbg_enable()
{
if(g_vewd_logmask == -3)
{
int idx=0;
char fileName[128]={0};
//struct timeval tv;
//struct timezone tz;
//gettimeofday (&tv , &tz);
idx = Detect_USBPath(outLogName[0]);
sprintf(fileName , "%svewd-interface-log.txt",outLogName[idx]);
gLogMsgFile = fopen(fileName,"w+");
}
}
void vewd_interface_debug_init(void)
{
//add for debug
{
FILE *fIn;
char *debugMessage;
char tmpValue[16] = {0};
char checkPath[4][20] = {"/tmp/OMXVDEC_DEBUG",
"/tmp/OMXV",
"/mtd_apexe/OMXV",
"/mnt/OMXV"};
int i, logMask=0;
for(i = 0 ; i < 4 ; i ++)
{
fIn = fopen(checkPath[i],"r");
if(fIn)
{
int readSize=0;
readSize = fread(tmpValue, 1, 16, fIn);
if(readSize != 0)
{
logMask = atoi(tmpValue);
}
fclose(fIn);
}
if(logMask)
{
break;
}
}
if(logMask != 0)
{
g_vewd_logmask = logMask;
}
}
vewd_dbg_enable();
}
void vewd_dbg_disable()
{
if(gLogMsgFile)
{
fclose(gLogMsgFile);
gLogMsgFile = NULL;
}
}
void messageWrite2File(char *msg, int size)
{
if(gLogMsgFile)
{
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts);
struct tm * timeinfo = localtime(&ts.tv_sec);
static char headStr[100];
if (NULL != timeinfo)
{
snprintf(headStr, 100, "%.2d:%.2d:%.2d.%.3ld ", timeinfo->tm_hour
, timeinfo->tm_min, timeinfo->tm_sec, ts.tv_nsec / 1000000);
fputs( headStr, gLogMsgFile );
}
fputs(msg, gLogMsgFile);
}
}
//===================================================================================================================
//========================================= use for debug End ======================================================
//===================================================================================================================
注释
/etc/mtab
fstab说明了我们需要挂载的文件系统，即在此声明的文件系统，我们的系统才能识别、挂载
mtab说明在我们的系统中当前实际挂载的文件系统，包括具体的属性（defaults默认实际挂载会显示属性为rw）
fstab 和 mtab 的区别
2007年10月27日 星期六 01:40
fstab 文件想必大家都很熟悉，记录了计算机上硬盘分区的相关信息，启动 Linux 的时候，检查分区的 fsck 命令，和挂载分区的 mount 命令，都需要 fstab 中的信息，来正确的检查和挂载硬盘。
除了 fstab 文件之外，还有一个 mtab 文件，和 fstab 文件一样在 /etc 文件下，位于 /etc/mtab ，这个文件又是干什么用的呢？
我们可以看一下 mtab 文件的内容 (这是我电脑上的 mtab 文件内容)：
lrwxrwxrwx 1 root root 19 Sep 13 10:48 mtab -> ../proc/self/mounts
cat /etc/mtab
/dev/sda4 / reiserfs rw,noatime 0 0 proc /proc proc rw,nosuid,nodev,noexec 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec 0 0 udev /dev tmpfs rw,nosuid 0 0 devpts /dev/pts devpts rw,nosuid,noexec 0 0 /dev/sda2 /boot ext2 rw,noatime 0 0 shm /dev/shm tmpfs rw,noexec,nosuid,nodev 0 0 /dev/sda1 /mnt/winxp ntfs rw,utf8,umask=0 0 0 usbfs /proc/bus/usb usbfs rw,noexec,nosuid,devmode=0664,devgid=85 0 0 /dev/sdb5 /media/SWAP vfat rw,nosuid,nodev,shortname=lower,uid=1000 0 0 乍看上去，和 fstab 文件的结构和内容基本相同，但是不同的是，mtab 文件记录的是，当前已挂载的分区信息。 每当 mount 挂载分区、umount 卸载分区，都会动态更新 mtab，mtab 总是保持着当前系统中已挂载的分区信息，fdisk、df 这类程序，必须要读取 mtab 文件，才能获得当前系统中的分区挂载情况
/etc/fstab和/etc/mtab是什么关系?
具体说说看?-----/etc/fstab是个配置文件,
而/etc/mtab则显示的是已经被挂载的fs的清单文件 PS:个人观点
fgets
char *fgets(char *s, int size, FILE *stream);
//fgets() reads in at most one less than size characters from stream and stores them into the buffer pointed to by s. Reading stops after an EOF or a newline. If a newline is read, it is stored into the buffer. A terminating null byte ('\0') is stored after the last character in the buffer.
fgets() returns s on success, and NULL on error or when end of file occurs while no characters have been read.
fgets 可以从stream 读取一行数据（最大：size -1 字节） s，若为：while( fgets())，则可以逐行读取整个file文件，遇到文件末尾返回值为NULL；
strsep
#include <string.h>
char *strsep(char **stringp, const char *delim);
// DESCRIPTION
If *stringp is NULL, the strsep() function returns NULL and does nothing else. Otherwise, this function finds the first token in the string *stringp, that is delimited by one of the bytes in the
string delim. This token is terminated by overwriting the delimiter with a null byte ('\0'), and *stringp is updated to point past the token. In case no delimiter was found, the token is taken to
be the entire string *stringp, and *stringp is made NULL.
RETURN VALUE
The strsep() function returns a pointer to the token, that is, it returns the original value of *stringp.
解释：
strsep ：分解字符串为一组字符串。从stringp指向的位置起向后扫描，遇到delim指向的字符串中的字符后，将此字符替换为NULL，返回stringp指向的地址。它适用于分割“关键字”在两个字符串之间只“严格出现一次”的情况。
返回值是分割关键字之前的字符串，stringp 表示分割后剩余的字符串。
For example：
#include <string>
#include <stdio.h>
int main(int arg, const char *argv[])
{
char* string = strdup( "/home/yinlijun/project:/home/yinlijun:/home/someone"); /*字符串不能为常量，所以strdup*/
char* p;
while((p = strsep(&string, ":")) != NULL) /*第一个参数设为二级指针, 字符串中所有的第二个参数（子串）最后会被替代成‘/0’*/
{
printf("%s/n", p);
}
return 0;
}
运行结果：
/home/yinlijun/project
/home/yinlijun
/home/someone