Update procfs library (#1640)
Bump procfs to latest release. Fixes: https://github.com/prometheus/node_exporter/issues/1625 Fixes: https://github.com/prometheus/node_exporter/issues/1634 Signed-off-by: Ben Kochie <superq@gmail.com>pull/1621/head
Ben Kochie
6 years ago
committed by
GitHub
parent
e49a13d0cf
commit
47610d0d2b
@ -1,4 +1,4 @@ |
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--- |
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linters: |
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enable: |
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- staticcheck |
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- govet |
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- golint |
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@ -0,0 +1,208 @@ |
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// Copyright 2019 The Prometheus Authors
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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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// +build !windows
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package procfs |
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import ( |
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"bufio" |
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"fmt" |
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"os" |
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"strconv" |
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"strings" |
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"golang.org/x/sys/unix" |
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) |
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type ProcMapPermissions struct { |
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// mapping has the [R]ead flag set
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Read bool |
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// mapping has the [W]rite flag set
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Write bool |
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// mapping has the [X]ecutable flag set
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Execute bool |
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// mapping has the [S]hared flag set
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Shared bool |
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// mapping is marked as [P]rivate (copy on write)
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Private bool |
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} |
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// ProcMap contains the process memory-mappings of the process,
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// read from /proc/[pid]/maps
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type ProcMap struct { |
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// The start address of current mapping.
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StartAddr uintptr |
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// The end address of the current mapping
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EndAddr uintptr |
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// The permissions for this mapping
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Perms *ProcMapPermissions |
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// The current offset into the file/fd (e.g., shared libs)
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Offset int64 |
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// Device owner of this mapping (major:minor) in Mkdev format.
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Dev uint64 |
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// The inode of the device above
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Inode uint64 |
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// The file or psuedofile (or empty==anonymous)
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Pathname string |
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} |
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// parseDevice parses the device token of a line and converts it to a dev_t
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// (mkdev) like structure.
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func parseDevice(s string) (uint64, error) { |
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toks := strings.Split(s, ":") |
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if len(toks) < 2 { |
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return 0, fmt.Errorf("unexpected number of fields") |
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} |
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major, err := strconv.ParseUint(toks[0], 16, 0) |
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if err != nil { |
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return 0, err |
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} |
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minor, err := strconv.ParseUint(toks[1], 16, 0) |
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if err != nil { |
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return 0, err |
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} |
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return unix.Mkdev(uint32(major), uint32(minor)), nil |
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} |
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// parseAddress just converts a hex-string to a uintptr
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func parseAddress(s string) (uintptr, error) { |
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a, err := strconv.ParseUint(s, 16, 0) |
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if err != nil { |
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return 0, err |
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} |
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return uintptr(a), nil |
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} |
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// parseAddresses parses the start-end address
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func parseAddresses(s string) (uintptr, uintptr, error) { |
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toks := strings.Split(s, "-") |
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if len(toks) < 2 { |
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return 0, 0, fmt.Errorf("invalid address") |
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} |
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saddr, err := parseAddress(toks[0]) |
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if err != nil { |
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return 0, 0, err |
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} |
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eaddr, err := parseAddress(toks[1]) |
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if err != nil { |
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return 0, 0, err |
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} |
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return saddr, eaddr, nil |
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} |
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// parsePermissions parses a token and returns any that are set.
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func parsePermissions(s string) (*ProcMapPermissions, error) { |
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if len(s) < 4 { |
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return nil, fmt.Errorf("invalid permissions token") |
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} |
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perms := ProcMapPermissions{} |
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for _, ch := range s { |
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switch ch { |
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case 'r': |
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perms.Read = true |
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case 'w': |
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perms.Write = true |
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case 'x': |
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perms.Execute = true |
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case 'p': |
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perms.Private = true |
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case 's': |
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perms.Shared = true |
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} |
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} |
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return &perms, nil |
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} |
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// parseProcMap will attempt to parse a single line within a proc/[pid]/maps
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// buffer.
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func parseProcMap(text string) (*ProcMap, error) { |
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fields := strings.Fields(text) |
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if len(fields) < 5 { |
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return nil, fmt.Errorf("truncated procmap entry") |
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} |
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saddr, eaddr, err := parseAddresses(fields[0]) |
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if err != nil { |
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return nil, err |
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} |
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perms, err := parsePermissions(fields[1]) |
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if err != nil { |
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return nil, err |
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} |
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offset, err := strconv.ParseInt(fields[2], 16, 0) |
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if err != nil { |
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return nil, err |
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} |
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device, err := parseDevice(fields[3]) |
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if err != nil { |
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return nil, err |
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} |
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inode, err := strconv.ParseUint(fields[4], 10, 0) |
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if err != nil { |
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return nil, err |
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} |
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pathname := "" |
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if len(fields) >= 5 { |
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pathname = strings.Join(fields[5:], " ") |
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} |
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return &ProcMap{ |
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StartAddr: saddr, |
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EndAddr: eaddr, |
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Perms: perms, |
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Offset: offset, |
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Dev: device, |
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Inode: inode, |
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Pathname: pathname, |
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}, nil |
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} |
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// ProcMaps reads from /proc/[pid]/maps to get the memory-mappings of the
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// process.
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func (p Proc) ProcMaps() ([]*ProcMap, error) { |
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file, err := os.Open(p.path("maps")) |
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if err != nil { |
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return nil, err |
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} |
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defer file.Close() |
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maps := []*ProcMap{} |
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scan := bufio.NewScanner(file) |
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for scan.Scan() { |
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m, err := parseProcMap(scan.Text()) |
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if err != nil { |
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return nil, err |
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} |
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maps = append(maps, m) |
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} |
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return maps, nil |
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} |
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