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/* Test for advisory record locking.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
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
of the License, 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, see <https://www.gnu.org/licenses/>.
*/
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
/* This is essentially the POSIX lockf. */
static int
fcntl_lockf (int fd, int cmd, off_t len)
{
struct flock fl = {
.l_type = F_WRLCK,
.l_whence = SEEK_CUR,
.l_len = len
};
switch (cmd)
{
case F_TEST:
fl.l_type = F_RDLCK;
if (fcntl (fd, F_GETLK, &fl) < 0)
return -1;
if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
return 0;
errno = EACCES;
return -1;
case F_ULOCK:
fl.l_type = F_UNLCK;
return fcntl (fd, F_SETLK, &fl);
case F_LOCK:
return fcntl (fd, F_SETLKW, &fl);
case F_TLOCK:
return fcntl (fd, F_SETLK, &fl);
}
errno = EINVAL;
return -1;
}
static int
fcntl64_lockf (int fd, int cmd, off64_t len64)
{
struct flock64 fl64 = {
.l_type = F_WRLCK,
.l_whence = SEEK_CUR,
.l_len = len64
};
switch (cmd)
{
case F_TEST:
fl64.l_type = F_RDLCK;
if (fcntl64 (fd, F_GETLK64, &fl64) < 0)
return -1;
if (fl64.l_type == F_UNLCK || fl64.l_pid == getpid ())
return 0;
errno = EACCES;
return -1;
case F_ULOCK:
fl64.l_type = F_UNLCK;
return fcntl64 (fd, F_SETLK64, &fl64);
case F_LOCK:
return fcntl64 (fd, F_SETLKW64, &fl64);
case F_TLOCK:
return fcntl64 (fd, F_SETLK64, &fl64);
}
errno = EINVAL;
return -1;
}
#define TST_LOCKFD "tst-fcntl-lock."
#define LOCKF fcntl_lockf
#define LOCKF64 fcntl64_lockf
#include "tst-lockf.c"
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