linux怎么写文件

fwrite(buffer,size,count,fp);

int markfile(void )

{

    FILE *sp ;

//    char buff[512] ;

    char count = 0;

    char *currentime = NULL;

    char *wday[] = {"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};

    time_t timep;

    struct tm *p;

    time(&timep);

    p = localtime(&timep);

    currentime = ctime(&timep);

//    memset(buff,0,512);

//    sprintf(buff,"%s",currentime);

    printf("%d/%d/%d",(1900+p->tm_year),(1+p->tm_mon),p->tm_mday);

    printf(" %s %d:%d:%d\n",wday[p->tm_wday],p->tm_hour,p->tm_min,p->tm_sec);

    if((sp = fopen("/root/kay/mark.txt","a+")) == NULL)

       return 0;

    fwrite(currentime,size(currentime)-1,1,sp);

    fclose(sp);

    return 1;

}