mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 04:50:07 +00:00
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/* 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"
|