#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
typedef struct data {
char *str;
long time;
int symbal;
} DATA;
int64_t getCurrentTime()
{
struct timeval tv;
gettimeofday(&tv,NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
int write_log(char *c){
FILE *fp;
ong curTime = getCurrentTime();
int line_count;
DATA *pt;
pt = (DATA *)malloc(sizeof(DATA));
// memcpy(pt->str, c, strlen(c)); 用数组的时候采用这种写法
pt->str = c;
pt->time = curTime;
pt->symbal = ;
printf("%s
", pt->str);
fp=fopen("system.log", "r+");
if(NULL == fp) {
fprintf(stderr,"open file system.log error! %s
",strerror(errno));
//doSystem("touch xxxfile.log");
return 0;
}
while((line_count = fgetc(fp)) != EOF)
{
if(line_count == '
') {
line_count++;
}
if (line_count < 100) {
//fseek(fp, sizeof(*fp), SEEK_END);
fwrite(pt,sizeof(DATA),1,fp);
} else {
//doSystem(" sed -i '0,49d' system.log ");
fwrite(pt,sizeof(DATA),1,fp);
}
free(pt);
fclose(fp);
return 0;
}
int main(int argc, char **argv)
{
char *p = "As food is to the body";
int ret = write_log(p);
printf("%d
", ret);
return ret;
}