/usr/include/ttylock.h is in liblockdev1-dev 1.0.3-1.6+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | /*
* 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
#include <lockdev.h>
/* API of the library */
int ttylock (char * devname);
int ttywait (char * devname);
int ttyunlock (char * devname);
int ttylocked (char * devname);
static inline int
ttylock(char *devname)
{
/* should set errno ? */
return dev_lock( devname) == 0 ? 0 : -1;
}
static inline int
ttyunlock (char *devname)
{
return dev_unlock(devname, 0);
}
static inline int
ttylocked(char *devname)
{
return dev_testlock( devname) == 0 ? 0 : -1;
}
static inline int
ttywait (char *devname)
{
while( dev_testlock( devname)) {
sleep(1);
}
}
#ifdef __cplusplus
};
#endif
#endif /* _TTYLOCK_H_ */
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