제가 mmap이라는 함수를 쓰게 됬는데요,
[code:1] int read_file,write_file,count;
void * read_buf; void * write_buf;
const int field_width = 136;
read_file = open("1min_file.txt",O_RDONLY);
write_file = open("1min_file.txt",O_RDWR); //
count = lseek(read_file,0,SEEK_END);
read_buf = mmap(0,count,PROT_READ,MAP_SHARED,read_file,0);
write_buf = mmap(0,count,PROT_WRITE,MAP_SHARED,write_file,0); // 문제가 되는 부분..
memcpy(write_buf,read_buf+field_width,count-field_width);
