#include<stdio.h> #include<stdlib.h> #include<string.h> #include<time.h> //#include<windows.h> #include <unistd.h> // linux下头文件#define FILE_MAX_SIZE (1024*1024)void get_local_time(char* buffer){time_t rawtime;struct tm* timeinfo;time(&rawtime);timeinfo = localtime(&rawtime);sprintf(buffer,"%04d-%02d-%02d %02d:%02d:%02d",(timeinfo->tm_year+1900),timeinfo->tm_mon,timeinfo->tm_mday,timeinfo->tm_hour,timeinfo->tm_min,timeinfo->tm_sec); }long get_file_size(char* filename){long length = 0;FILE* fp = NULL;fp = fopen(filename,"rb");if(fp != NULL){fseek(fp,0,SEEK_END);length = ftell(fp);}if(fp != NULL){fclose(fp);fp = NULL;}return length; }void write_log_file(char* filename,long max_size,char* buffer,unsigned buf_size){if(filename != NULL && buffer != NULL ){long length = get_file_size(filename);if(length > max_size){unlink(filename);}{FILE* fp;fp = fopen(filename,"at+");if(fp != NULL){char now[32];memset(now,0,sizeof(now));get_local_time(now);fwrite(now,strlen(now)+1,1,fp);fwrite(buffer,buf_size,1,fp);fclose(fp);fp = NULL;}}} }int main(int argc,char** argv){for(int i = 0; i < 10; ++i){char buffer[32];memset(buffer,0,sizeof(buffer));sprintf(buffer,"====>%d\n",i);write_log_file("log.txt",FILE_MAX_SIZE,buffer,strlen(buffer));sleep(1);//Sleep(100); }return 0; }
未完待续
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