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// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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.
//go:build !windows
// +build !windows
package limits
import (
"errors"
"math"
"syscall"
"testing"
)
type rlimitFunc func(int, *syscall.Rlimit) error
func TestSetupFDLimits(t *testing.T) {
tests := []struct {
desc string
getFunc rlimitFunc
setFunc rlimitFunc
wantFDs uint64
wantErr bool
}{
{
desc: "Getrlimit fails",
getFunc: func(_ int, _ *syscall.Rlimit) error {
return errors.New("failed to read rlimit for max file descriptors")
},
setFunc: func(_ int, _ *syscall.Rlimit) error {
panic("shouldn't be called")
},
wantFDs: 0,
wantErr: true,
},
{
desc: "Getrlimit max is less than wantFDs",
getFunc: func(_ int, rlim *syscall.Rlimit) error {
rlim.Cur = 512
rlim.Max = 512
return nil
},
setFunc: func(_ int, rlim *syscall.Rlimit) error {
if rlim.Cur != 1024 || rlim.Max != 1024 {
return errors.New("setrlimit called with unexpected value")
}
return nil
},
wantFDs: 1024,
wantErr: false,
},
{
desc: "Getrlimit returns rlim_infinity",
getFunc: func(_ int, rlim *syscall.Rlimit) error {
rlim.Cur = math.MaxUint64
rlim.Max = math.MaxUint64
return nil
},
setFunc: func(_ int, _ *syscall.Rlimit) error {
panic("shouldn't be called")
},
wantFDs: 1024,
wantErr: false,
},
{
desc: "Getrlimit cur is greater than wantFDs",
getFunc: func(_ int, rlim *syscall.Rlimit) error {
rlim.Cur = 512
rlim.Max = 512
return nil
},
setFunc: func(_ int, _ *syscall.Rlimit) error {
panic("shouldn't be called")
},
wantFDs: 256,
wantErr: false,
},
{
desc: "Setrlimit fails",
getFunc: func(_ int, rlim *syscall.Rlimit) error {
rlim.Cur = 128
rlim.Max = 512
return nil
},
setFunc: func(_ int, _ *syscall.Rlimit) error {
return errors.New("failed to set rlimit for max file descriptors")
},
wantFDs: 256,
wantErr: true,
},
{
desc: "Success",
getFunc: func(_ int, rlim *syscall.Rlimit) error {
rlim.Cur = 128
rlim.Max = 512
return nil
},
setFunc: func(_ int, _ *syscall.Rlimit) error {
return nil
},
wantFDs: 256,
wantErr: false,
},
}
for _, test := range tests {
oldGetFunc := syscallGetrlimit
syscallGetrlimit = test.getFunc
defer func() {
syscallGetrlimit = oldGetFunc
}()
oldSetFunc := syscallSetrlimit
syscallSetrlimit = test.setFunc
defer func() {
syscallSetrlimit = oldSetFunc
}()
gotErr := SetupFDLimits(test.wantFDs)
if (gotErr != nil) != test.wantErr {
t.Errorf("%s: limits.SetupFDLimits(%d) returned error %v, wantErr %v", test.desc, test.wantFDs, gotErr, test.wantErr)
}
}
}
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