1 // mmc -- Mattermost client
2 // Copyright (C) 2023-2024 Sergey Matveev <stargrave@stargrave.org>
4 // This program is free software: you can redistribute it and/or modify
5 // it under the terms of the GNU Affero General Public License as
6 // published by the Free Software Foundation, either version 3 of the
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU Affero General Public License for more details.
14 // You should have received a copy of the GNU Affero General Public License
15 // along with this program. If not, see <http://www.gnu.org/licenses/>.
23 "golang.org/x/sys/unix"
26 func Lock(what string) (func(), error) {
27 fd, err := os.OpenFile(
29 os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
36 flock := unix.Flock_t{
40 if err = unix.FcntlFlock(fd.Fd(), unix.F_SETLKW, &flock); err != nil {
45 flock.Type = unix.F_UNLCK
46 unix.FcntlFlock(fd.Fd(), unix.F_SETLK, &flock)