1 // NNCP -- Node to Node copy, utilities for store-and-forward data exchange
2 // Copyright (C) 2016-2024 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 General Public License as published by
6 // the Free Software Foundation, version 3 of the License.
8 // This program is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 // GNU General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program. If not, see <http://www.gnu.org/licenses/>.
22 "golang.org/x/sys/unix"
25 func (ctx *Ctx) LockDir(nodeId *NodeId, lockCtx string) (*os.File, error) {
26 if err := ctx.ensureRxDir(nodeId); err != nil {
29 lockPath := filepath.Join(ctx.Spool, nodeId.String(), lockCtx) + ".lock"
30 dirLock, err := os.OpenFile(
32 os.O_CREATE|os.O_WRONLY,
36 ctx.LogE("lockdir-open", LEs{{"Path", lockPath}}, err, func(les LEs) string {
37 return "Locking directory: opening " + lockPath
41 err = unix.Flock(int(dirLock.Fd()), unix.LOCK_EX|unix.LOCK_NB)
43 ctx.LogE("lockdir-flock", LEs{{"Path", lockPath}}, err, func(les LEs) string {
44 return "Locking directory: locking " + lockPath
52 func (ctx *Ctx) UnlockDir(fd *os.File) {
54 unix.Flock(int(fd.Fd()), unix.LOCK_UN)