#ifndef _SYS_UIO_H #define _SYS_UIO_H 1 // https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_uio.h.html #include <sys/cdefs.h> __BEGIN_DECLS #define __need_size_t #define __need_ssize_t #include <sys/types.h> struct iovec { void* iov_base; /* Base address of a memory region for input or output. */ size_t iov_len; /* The size of the memory pointed to by iov_base. */ }; ssize_t readv(int fildes, const struct iovec* iov, int iovcnt); ssize_t writev(int fildes, const struct iovec* iov, int iovcnt); __END_DECLS #endif