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98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/* Test for advisory record locking.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include <unistd.h>
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/* This is essentially the POSIX lockf. */
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static int
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fcntl_lockf (int fd, int cmd, off_t len)
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{
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struct flock fl = {
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.l_type = F_WRLCK,
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.l_whence = SEEK_CUR,
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.l_len = len
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};
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switch (cmd)
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{
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case F_TEST:
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fl.l_type = F_RDLCK;
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if (fcntl (fd, F_GETLK, &fl) < 0)
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return -1;
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if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
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return 0;
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errno = EACCES;
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return -1;
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case F_ULOCK:
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fl.l_type = F_UNLCK;
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return fcntl (fd, F_SETLK, &fl);
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case F_LOCK:
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return fcntl (fd, F_SETLKW, &fl);
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case F_TLOCK:
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return fcntl (fd, F_SETLK, &fl);
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}
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errno = EINVAL;
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return -1;
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}
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static int
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fcntl64_lockf (int fd, int cmd, off64_t len64)
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{
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struct flock64 fl64 = {
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.l_type = F_WRLCK,
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.l_whence = SEEK_CUR,
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.l_len = len64
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};
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switch (cmd)
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{
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case F_TEST:
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fl64.l_type = F_RDLCK;
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if (fcntl64 (fd, F_GETLK64, &fl64) < 0)
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return -1;
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if (fl64.l_type == F_UNLCK || fl64.l_pid == getpid ())
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return 0;
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errno = EACCES;
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return -1;
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case F_ULOCK:
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fl64.l_type = F_UNLCK;
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return fcntl64 (fd, F_SETLK64, &fl64);
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case F_LOCK:
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return fcntl64 (fd, F_SETLKW64, &fl64);
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case F_TLOCK:
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return fcntl64 (fd, F_SETLK64, &fl64);
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}
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errno = EINVAL;
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return -1;
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}
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#define TST_LOCKFD "tst-fcntl-lock."
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#define LOCKF fcntl_lockf
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#define LOCKF64 fcntl64_lockf
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#include "tst-lockf.c"
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