+ struct timeval *timeout_tv);
+__must_check int mark_fd_nonblocking(int fd);
+__must_check int mark_fd_blocking(int fd);
+void para_fd_set(int fd, fd_set *fds, int *max_fileno);
+__must_check int para_fgets(char *line, int size, FILE *f);
+int para_mmap(size_t length, int prot, int flags, int fd, off_t offset,
+ void *map);
+int para_open(const char *path, int flags, mode_t mode);
+int para_opendir(const char *dirname, DIR **dir, int *cwd);
+int para_mkdir(const char *path, mode_t mode);
+int para_fchdir(int fd);
+int para_chdir(const char *path);
+int mmap_full_file(const char *filename, int open_mode, void **map,
+ size_t *size, int *fd_ptr);
+int para_munmap(void *start, size_t length);
+int write_ok(int fd);
+void valid_fd_012(void);
+int write_nonblock(int fd, const char *buf, size_t len,
+ size_t max_bytes_per_write);
+int for_each_file_in_dir(const char *dirname,
+ int (*func)(const char *, void *), void *private_data);