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/*
* ttylock.h
* (c) 1997 by Fabrizio Polacco <fpolacco@debian.org>
* this header file is part of the lockdev library.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; version 2
* dated June, 1991.
*
* 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 Library General
* Public License along with this program; if not, write to the
* Free Software Foundation, Inc., 675 Mass Ave., Cambridge, MA
* 02139, USA.
*
* This header file provides an alternative API to the services of
* the lockdev library, the same API implemented by AIX.
* It is intended as a quick help for any program originally
* designed for the AIX that wants to move to lockdev.
*
*/
#ifndef _TTYLOCK_H_
#define _TTYLOCK_H_
#ifdef __cplusplus
extern "C" {
#endif
#ifndef __P
# if defined (__STDC__) || defined (_AIX) \
|| (defined (__mips) && defined (_SYSTYPE_SVR4)) \
|| defined(WIN32) || defined(__cplusplus)
# define __P(protos) protos
# else
# define __P(protos) ()
# endif
#endif
#include <lockdev.h>
/* API of the library */
int ttylock __P(( char * devname));
int ttywait __P(( char * devname));
int ttyunlock __P(( char * devname));
int ttylocked __P(( char * devname));
static inline int
ttylock( devname)
char * devname;
{
/* should set errno ? */
return( dev_lock( devname) == 0 ? 0 : -1);
}
static inline int
ttyunlock( devname)
char * devname;
{
return( dev_unlock( devname, 0));
}
static inline int
ttylocked( devname)
char * devname;
{
return( dev_testlock( devname) == 0 ? 0 : -1);
}
static inline int
ttywait( devname)
char * devname;
{
while( dev_testlock( devname)) {
sleep(1);
}
}
#ifdef __cplusplus
};
#endif
#endif /* _TTYLOCK_H_ */
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