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// Copyright 2018 The Prometheus 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 procfs
import (
"bufio"
"fmt"
"os"
"regexp"
"strconv"
)
// ProcLimits represents the soft limits for each of the process's resource
// limits. For more information see getrlimit(2):
// http://man7.org/linux/man-pages/man2/getrlimit.2.html.
type ProcLimits struct {
// CPU time limit in seconds.
CPUTime uint64
// Maximum size of files that the process may create.
FileSize uint64
// Maximum size of the process's data segment (initialized data,
// uninitialized data, and heap).
DataSize uint64
// Maximum size of the process stack in bytes.
StackSize uint64
// Maximum size of a core file.
CoreFileSize uint64
// Limit of the process's resident set in pages.
ResidentSet uint64
// Maximum number of processes that can be created for the real user ID of
// the calling process.
Processes uint64
// Value one greater than the maximum file descriptor number that can be
// opened by this process.
OpenFiles uint64
// Maximum number of bytes of memory that may be locked into RAM.
LockedMemory uint64
// Maximum size of the process's virtual memory address space in bytes.
AddressSpace uint64
// Limit on the combined number of flock(2) locks and fcntl(2) leases that
// this process may establish.
FileLocks uint64
// Limit of signals that may be queued for the real user ID of the calling
// process.
PendingSignals uint64
// Limit on the number of bytes that can be allocated for POSIX message
// queues for the real user ID of the calling process.
MsqqueueSize uint64
// Limit of the nice priority set using setpriority(2) or nice(2).
NicePriority uint64
// Limit of the real-time priority set using sched_setscheduler(2) or
// sched_setparam(2).
RealtimePriority uint64
// Limit (in microseconds) on the amount of CPU time that a process
// scheduled under a real-time scheduling policy may consume without making
// a blocking system call.
RealtimeTimeout uint64
}
const (
limitsFields = 4
limitsUnlimited = "unlimited"
)
var (
limitsMatch = regexp.MustCompile(`(Max \w+\s{0,1}?\w*\s{0,1}\w*)\s{2,}(\w+)\s+(\w+)`)
)
// NewLimits returns the current soft limits of the process.
//
// Deprecated: Use p.Limits() instead.
func (p Proc) NewLimits() (ProcLimits, error) {
return p.Limits()
}
// Limits returns the current soft limits of the process.
func (p Proc) Limits() (ProcLimits, error) {
f, err := os.Open(p.path("limits"))
if err != nil {
return ProcLimits{}, err
}
defer f.Close()
var (
l = ProcLimits{}
s = bufio.NewScanner(f)
)
s.Scan() // Skip limits header
for s.Scan() {
//fields := limitsMatch.Split(s.Text(), limitsFields)
fields := limitsMatch.FindStringSubmatch(s.Text())
if len(fields) != limitsFields {
return ProcLimits{}, fmt.Errorf("%w: couldn't parse %q line %q", ErrFileParse, f.Name(), s.Text())
}
switch fields[1] {
case "Max cpu time":
l.CPUTime, err = parseUint(fields[2])
case "Max file size":
l.FileSize, err = parseUint(fields[2])
case "Max data size":
l.DataSize, err = parseUint(fields[2])
case "Max stack size":
l.StackSize, err = parseUint(fields[2])
case "Max core file size":
l.CoreFileSize, err = parseUint(fields[2])
case "Max resident set":
l.ResidentSet, err = parseUint(fields[2])
case "Max processes":
l.Processes, err = parseUint(fields[2])
case "Max open files":
l.OpenFiles, err = parseUint(fields[2])
case "Max locked memory":
l.LockedMemory, err = parseUint(fields[2])
case "Max address space":
l.AddressSpace, err = parseUint(fields[2])
case "Max file locks":
l.FileLocks, err = parseUint(fields[2])
case "Max pending signals":
l.PendingSignals, err = parseUint(fields[2])
case "Max msgqueue size":
l.MsqqueueSize, err = parseUint(fields[2])
case "Max nice priority":
l.NicePriority, err = parseUint(fields[2])
case "Max realtime priority":
l.RealtimePriority, err = parseUint(fields[2])
case "Max realtime timeout":
l.RealtimeTimeout, err = parseUint(fields[2])
}
if err != nil {
return ProcLimits{}, err
}
}
return l, s.Err()
}
func parseUint(s string) (uint64, error) {
if s == limitsUnlimited {
return 18446744073709551615, nil
}
i, err := strconv.ParseUint(s, 10, 64)
if err != nil {
return 0, fmt.Errorf("%s: couldn't parse value %q: %w", ErrFileParse, s, err)
}
return i, nil
}
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