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/*
Copyright (C) 1994 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "io_S.h"
#include <fcntl.h>
/* Implement io_select as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_select (struct protid *cred,
int type,
mach_port_t port,
int tag,
int *possible)
{
if (!cred)
return EOPNOTSUPP;
mutex_lock (&cred->po->np->lock);
if (((type & SELECT_READ) && !(cred->po->openstat & O_READ))
|| ((type & SELECT_WRITE) && !(cred->po->openstat & O_WRITE)))
{
mutex_unlock (&cred->po->np->lock);
return EBADF;
}
mutex_unlock (&cred->po->np->lock);
/* Select is always possible */
mach_port_deallocate (mach_task_self (), port);
*possible = type & ~SELECT_URG;
return 0;
}
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