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/*
* fcntl() - POSIX 1003.1b 6.5.2 - File Control
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <rtems.h>
#include "libio_.h"
int fcntl(
int fd,
int cmd,
...
)
{
va_list ap;
rtems_libio_t *iop;
va_start( ap, cmd );
/*
* If this is not a file system based entity, it is an error.
*/
if ( rtems_file_descriptor_type( fd ) )
set_errno_and_return_minus_one( EBADF );
/*
* Now process the fcntl().
*/
iop = rtems_libio_iop( fd );
rtems_libio_check_fd( fd );
/*
* This switch should contain all the cases from POSIX.
*/
switch ( cmd ) {
case F_DUPFD: /* dup */
/*
* This is how it appears that this case should work:
*
* filedes2 = va_arg( ap, int )
* if filedes2 is 0
* duplicate fd into a new descriptor
* else
* duplicate fd into specified descriptor after error checking it
*
* See dup2() in case we can eliminate stuff in there.
*/
return -1;
case F_GETFD: /* get f_flags */
if ( iop->flags & LIBIO_FLAGS_CLOSE_ON_EXEC )
return 1;
return 0;
case F_SETFD: /* set f_flags */
/*
* Interpret the third argument as the "close on exec()" flag.
* If this argument is 1, then the file descriptor is to be closed
* if a new process is exec()'ed. Since RTEMS does not support
* processes, then we can ignore this one except to make
* F_GETFD work.
*/
if ( va_arg( ap, int ) )
iop->flags |= LIBIO_FLAGS_CLOSE_ON_EXEC;
else
iop->flags &= ~LIBIO_FLAGS_CLOSE_ON_EXEC;
return 0;
case F_GETFL: /* more flags (cloexec) */
return -1;
case F_SETFL:
return -1;
case F_GETLK:
return -1;
case F_SETLK:
return -1;
case F_SETLKW:
return -1;
case F_SETOWN: /* for sockets. */
return -1;
case F_GETOWN: /* for sockets. */
return -1;
default:
break;
}
return -1;
}
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