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Copy pathlock_solaris.go
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110 lines (97 loc) · 2.82 KB
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//go:build solaris
// +build solaris
// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package lock
import (
"os"
"syscall"
)
// lockedOpenFile is an internal function.
func lockedOpenFile(path string, flag int, perm os.FileMode, rlockType int) (*LockedFile, error) {
var lockType int16
switch flag {
case syscall.O_RDONLY:
lockType = syscall.F_RDLCK
case syscall.O_WRONLY:
fallthrough
case syscall.O_RDWR:
fallthrough
case syscall.O_WRONLY | syscall.O_CREAT:
fallthrough
case syscall.O_RDWR | syscall.O_CREAT:
lockType = syscall.F_WRLCK
default:
return nil, &os.PathError{
Op: "open",
Path: path,
Err: syscall.EINVAL,
}
}
lock := syscall.Flock_t{
Start: 0,
Len: 0,
Pid: 0,
Type: lockType,
Whence: 0,
}
f, err := os.OpenFile(path, flag, perm)
if err != nil {
return nil, err
}
if err = syscall.FcntlFlock(f.Fd(), rlockType, &lock); err != nil {
f.Close()
if err == syscall.EAGAIN {
err = ErrAlreadyLocked
}
return nil, err
}
st, err := os.Stat(path)
if err != nil {
f.Close()
return nil, err
}
if st.IsDir() {
f.Close()
return nil, &os.PathError{
Op: "open",
Path: path,
Err: syscall.EISDIR,
}
}
4666
return &LockedFile{f}, nil
}
// TryLockedOpenFile - tries a new write lock, functionality
// it is similar to LockedOpenFile with with syscall.LOCK_EX
// mode but along with syscall.LOCK_NB such that the function
// doesn't wait forever but instead returns if it cannot
// acquire a write lock.
func TryLockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
return lockedOpenFile(path, flag, perm, syscall.F_SETLK)
}
// LockedOpenFile - initializes a new lock and protects
// the file from concurrent access across mount points.
// This implementation doesn't support all the open
// flags and shouldn't be considered as replacement
// for os.OpenFile().
func LockedOpenFile(path string, flag int, perm os.FileMode) (*LockedFile, error) {
return lockedOpenFile(path, flag, perm, syscall.F_SETLKW)
}
// Open - Call os.OpenFile
func Open(path string, flag int, perm os.FileMode) (*os.File, error) {
return os.OpenFile(path, flag, perm)
}