/*
* init_running_print, if sucess then return fp, else return NULL
*/
FILE *
init_running_print()
{
int i=0, k=0;
FILE *fp, *fptmp;
char line[LEN_10240] = {0};
char filename[LEN_128] = {0};
/* will print tail*/
conf.print_tail = 1;
fp = fopen(conf.output_file_path, "r");//读取/var/log/tsar.data文件
if (!fp) {
do_debug(LOG_FATAL, "unable to open the log file %s\n", conf.output_file_path);
}
/*log number to use for print*/
conf.print_file_number = -1;
/* find start offset will print from tsar.data */
k=find_offset_from_start(fp, i);//在tsar.data文件中，用二分查找，找出要开始打印的行的位置放在print_file_number。
if (k == 1) {//如果返回1，代表当前的文件里面没有数据，数据在后面的文件中。用同样的方法扫描后面的文件。
/*find all possible record*/
for (i=1; ; i++) {
memset(filename, 0, sizeof(filename));
sprintf(filename, "%s.%d", conf.output_file_path, i);
fptmp = fopen(filename, "r");
if (!fptmp) {
conf.print_file_number = i - 1;
break;
}
k=find_offset_from_start(fptmp, i);
if (k==0 || k==4) {
if (fclose(fp) < 0) {
do_debug(LOG_FATAL, "fclose error:%s", strerror(errno));
}
fp=fptmp;
break;
}
if (k== 2) {
if (fseek(fp, 0, SEEK_SET) != 0) {
do_debug(LOG_FATAL, "fseek error:%s", strerror(errno));
}
if (fclose(fptmp) < 0) {
do_debug(LOG_FATAL, "fclose error:%s", strerror(errno));
}
break;
}
if (k == 1) {
if (fclose(fp) < 0) {
do_debug(LOG_FATAL, "fclose error:%s", strerror(errno));
}
fp=fptmp;
continue;
}
if (k == 5 || k == 6) {
do_debug(LOG_FATAL, "log format error or find_offset_from_start have a bug. error code=%d\n", k);
}
}
}
if (k == 5 || k == 6) {
do_debug(LOG_FATAL, "log format error or find_offset_from_start have a bug. error code=%d\n", k);
}
/* get record */
if (!fgets(line, LEN_10240, fp)) {
do_debug(LOG_FATAL, "can't get enough log info\n");
}
/* read one line to init module parameter */
read_line_to_module_record(line);//读取一行数据到每个模块的mod->record
/* print header */
print_header();//打印头部信息
/* set struct module fields */
init_module_fields();
set_record_time(line);//更新conf.print_interval的间隔时间
return fp;
}
/*
* init_running_print, if sucess then return fp, else return NULL
*/
FILE *init_running_print()
{
int i=0,k=0;
FILE *fp,*fptmp;
char line[LEN_10240] = {0};
char filename[LEN_128] = {0};
/* will print tail*/
conf.print_tail = 1;
fp = fopen(conf.output_file_path, "r");
if (!fp){
do_debug(LOG_FATAL, "unable to open the log file %s\n",conf.output_file_path);
}
/*log number to use for print*/
conf.print_file_number = -1;
/* find start offset will print from tsar.data */
k=find_offset_from_start(fp,i);
if(k==1){
/*find all possible record*/
for(i=1;;i++){
memset(filename,0,sizeof(filename));
sprintf(filename,"%s.%d",conf.output_file_path,i);
fptmp = fopen(filename, "r");
if(!fptmp){
conf.print_file_number = i - 1;
break;
}
k=find_offset_from_start(fptmp,i);
if(k==0 || k==4){
fclose(fp);
fp=fptmp;
break;
}
if(k==2){
fseek(fp,0,SEEK_SET);
fclose(fptmp);
break;
}
if(k==1){
fclose(fp);
fp=fptmp;
continue;
}
if(k==5 || k==6){
do_debug(LOG_FATAL, "log format error or find_offset_from_start have a bug. error code=%d\n",k);
}
}
}
if(k==5 || k==6){
do_debug(LOG_FATAL, "log format error or find_offset_from_start have a bug. error code=%d\n",k);
}
/* get record */
if (!fgets(line, LEN_10240, fp)) {
do_debug(LOG_FATAL, "can't get enough log info\n");
}
/* read one line to init module parameter */
read_line_to_module_record(line);
/* print header */
print_header();
/* set struct module fields */
init_module_fields();
set_record_time(line);
return fp;
}
