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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("couldn't parse %q line %q", 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("couldn't parse value %q: %w", s, err)
- }
- return i, nil
- }
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