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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package lock
import (
"syscall"
"testing"
)
func TestComputeRange(t *testing.T) {
tests := []struct {
// Description of test.
name string
// Requested start of the lock range.
start int64
// Requested length of the lock range,
// can be negative :(
length int64
// Pre-computed file offset based on whence.
// Will be added to start.
offset int64
// Expected error.
err error
// If error is nil, the expected LockRange.
LockRange
}{
{
name: "offset, start, and length all zero",
LockRange: LockRange{Start: 0, End: LockEOF},
},
{
name: "zero offset, zero start, positive length",
start: 0,
length: 4096,
offset: 0,
LockRange: LockRange{Start: 0, End: 4096},
},
{
name: "zero offset, negative start",
start: -4096,
offset: 0,
err: syscall.EINVAL,
},
{
name: "large offset, negative start, positive length",
start: -2048,
length: 2048,
offset: 4096,
LockRange: LockRange{Start: 2048, End: 4096},
},
{
name: "large offset, negative start, zero length",
start: -2048,
length: 0,
offset: 4096,
LockRange: LockRange{Start: 2048, End: LockEOF},
},
{
name: "zero offset, zero start, negative length",
start: 0,
length: -4096,
offset: 0,
err: syscall.EINVAL,
},
{
name: "large offset, zero start, negative length",
start: 0,
length: -4096,
offset: 4096,
LockRange: LockRange{Start: 0, End: 4096},
},
{
name: "offset, start, and length equal, length is negative",
start: 1024,
length: -1024,
offset: 1024,
LockRange: LockRange{Start: 1024, End: 2048},
},
{
name: "offset, start, and length equal, start is negative",
start: -1024,
length: 1024,
offset: 1024,
LockRange: LockRange{Start: 0, End: 1024},
},
{
name: "offset, start, and length equal, offset is negative",
start: 1024,
length: 1024,
offset: -1024,
LockRange: LockRange{Start: 0, End: 1024},
},
{
name: "offset, start, and length equal, all negative",
start: -1024,
length: -1024,
offset: -1024,
err: syscall.EINVAL,
},
{
name: "offset, start, and length equal, all positive",
start: 1024,
length: 1024,
offset: 1024,
LockRange: LockRange{Start: 2048, End: 3072},
},
}
for _, test := range tests {
rng, err := ComputeRange(test.start, test.length, test.offset)
if err != test.err {
t.Errorf("%s: lockRange(%d, %d, %d) got error %v, want %v", test.name, test.start, test.length, test.offset, err, test.err)
continue
}
if err == nil && rng != test.LockRange {
t.Errorf("%s: lockRange(%d, %d, %d) got LockRange %v, want %v", test.name, test.start, test.length, test.offset, rng, test.LockRange)
}
}
}
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