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