source: rtems/cpukit/libcsupport/src/readv.c @ 1c6926c1

/**
 *  @file
 *
 *  @brief Read a Vector
 *  @ingroup libcsupport
 */

/*
 *  COPYRIGHT (c) 1989-2011.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/uio.h>

#include <rtems/libio_.h>

/**
 *  readv() - POSIX 1003.1 - Read a Vector
 *
 *  OpenGroup URL:
 *
 *  http://www.opengroup.org/onlinepubs/009695399/functions/readv.html
 */
ssize_t readv(
  int                 fd,
  const struct iovec *iov,
  int                 iovcnt
)
{
  ssize_t        total;
  rtems_libio_t *iop;

  total = rtems_libio_iovec_eval( fd, iov, iovcnt, LIBIO_FLAGS_READ, &iop );

  if ( total > 0 ) {
    total = ( *iop->pathinfo.handlers->readv_h )( iop, iov, iovcnt, total );
  }

  return total;
}