source: rtems/cpukit/libcsupport/src/readlink.c @ ae55da72

/*
 *  readlink() - POSIX 1003.1b - X.X.X - XXX
 *
 *  COPYRIGHT (c) 1989-1999.
 *  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.com/license/LICENSE.
 */

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

#include <unistd.h>

#include <rtems/libio_.h>

ssize_t readlink( const char *path, char *buf, size_t bufsize )
{
  ssize_t rv = 0;
  rtems_filesystem_eval_path_context_t ctx;
  int eval_flags = RTEMS_FS_FOLLOW_HARD_LINK;
  const rtems_filesystem_location_info_t *currentloc =
    rtems_filesystem_eval_path_start( &ctx, path, eval_flags );
  rtems_filesystem_node_types_t type =
    (*currentloc->ops->node_type_h)( currentloc );

  if ( type == RTEMS_FILESYSTEM_SYM_LINK ) {
    rv = (*currentloc->ops->readlink_h)( currentloc, buf, bufsize );
  } else {
    rtems_filesystem_eval_path_error( &ctx, EINVAL );
    rv = -1;
  }

  rtems_filesystem_eval_path_cleanup( &ctx );

  return rv;
}