/** \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);