int write_all(int fd, const char *buf, size_t len);
__printf_2_3 int write_va_buffer(int fd, const char *fmt, ...);
bool file_exists(const char *);
-int para_select(int n, fd_set *readfds, fd_set *writefds,
- struct timeval *timeout_tv);
+int para_select(int n, fd_set *readfds, fd_set *writefds, int timeout);
__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);
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 read_ok(int fd);
int write_ok(int fd);
void valid_fd_012(void);
int readv_nonblock(int fd, struct iovec *iov, int iovcnt, fd_set *rfds,