unsigned col_num, unsigned *rank);
int for_each_file_in_dir(const char *dirname,
- int (*func)(const char *, const void *), const void *private_data);
+ int (*func)(const char *, void *), void *private_data);
ssize_t para_write_all(int fd, const void *buf, size_t size);
int para_lseek(int fd, off_t *offset, int whence);
int para_write_file(const char *filename, const void *buf, size_t size);