/** \file fd.h exported symbols from fd.c */
int write_all(int fd, const char *buf, size_t *len);
+int para_readv(int fd, struct iovec *iov, int iovcnt);
int file_exists(const char *);
int para_select(int n, fd_set *readfds, fd_set *writefds,
struct timeval *timeout_tv);
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);