[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/proc_maps.go b/vendor/github.com/prometheus/procfs/proc_maps.go
new file mode 100644
index 0000000..1d7772d
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/proc_maps.go
@@ -0,0 +1,209 @@
+// Copyright 2019 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.
+
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package procfs
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "strconv"
+ "strings"
+
+ "golang.org/x/sys/unix"
+)
+
+// ProcMapPermissions contains permission settings read from /proc/[pid]/maps
+type ProcMapPermissions struct {
+ // mapping has the [R]ead flag set
+ Read bool
+ // mapping has the [W]rite flag set
+ Write bool
+ // mapping has the [X]ecutable flag set
+ Execute bool
+ // mapping has the [S]hared flag set
+ Shared bool
+ // mapping is marked as [P]rivate (copy on write)
+ Private bool
+}
+
+// ProcMap contains the process memory-mappings of the process,
+// read from /proc/[pid]/maps
+type ProcMap struct {
+ // The start address of current mapping.
+ StartAddr uintptr
+ // The end address of the current mapping
+ EndAddr uintptr
+ // The permissions for this mapping
+ Perms *ProcMapPermissions
+ // The current offset into the file/fd (e.g., shared libs)
+ Offset int64
+ // Device owner of this mapping (major:minor) in Mkdev format.
+ Dev uint64
+ // The inode of the device above
+ Inode uint64
+ // The file or psuedofile (or empty==anonymous)
+ Pathname string
+}
+
+// parseDevice parses the device token of a line and converts it to a dev_t
+// (mkdev) like structure.
+func parseDevice(s string) (uint64, error) {
+ toks := strings.Split(s, ":")
+ if len(toks) < 2 {
+ return 0, fmt.Errorf("unexpected number of fields")
+ }
+
+ major, err := strconv.ParseUint(toks[0], 16, 0)
+ if err != nil {
+ return 0, err
+ }
+
+ minor, err := strconv.ParseUint(toks[1], 16, 0)
+ if err != nil {
+ return 0, err
+ }
+
+ return unix.Mkdev(uint32(major), uint32(minor)), nil
+}
+
+// parseAddress just converts a hex-string to a uintptr
+func parseAddress(s string) (uintptr, error) {
+ a, err := strconv.ParseUint(s, 16, 0)
+ if err != nil {
+ return 0, err
+ }
+
+ return uintptr(a), nil
+}
+
+// parseAddresses parses the start-end address
+func parseAddresses(s string) (uintptr, uintptr, error) {
+ toks := strings.Split(s, "-")
+ if len(toks) < 2 {
+ return 0, 0, fmt.Errorf("invalid address")
+ }
+
+ saddr, err := parseAddress(toks[0])
+ if err != nil {
+ return 0, 0, err
+ }
+
+ eaddr, err := parseAddress(toks[1])
+ if err != nil {
+ return 0, 0, err
+ }
+
+ return saddr, eaddr, nil
+}
+
+// parsePermissions parses a token and returns any that are set.
+func parsePermissions(s string) (*ProcMapPermissions, error) {
+ if len(s) < 4 {
+ return nil, fmt.Errorf("invalid permissions token")
+ }
+
+ perms := ProcMapPermissions{}
+ for _, ch := range s {
+ switch ch {
+ case 'r':
+ perms.Read = true
+ case 'w':
+ perms.Write = true
+ case 'x':
+ perms.Execute = true
+ case 'p':
+ perms.Private = true
+ case 's':
+ perms.Shared = true
+ }
+ }
+
+ return &perms, nil
+}
+
+// parseProcMap will attempt to parse a single line within a proc/[pid]/maps
+// buffer.
+func parseProcMap(text string) (*ProcMap, error) {
+ fields := strings.Fields(text)
+ if len(fields) < 5 {
+ return nil, fmt.Errorf("truncated procmap entry")
+ }
+
+ saddr, eaddr, err := parseAddresses(fields[0])
+ if err != nil {
+ return nil, err
+ }
+
+ perms, err := parsePermissions(fields[1])
+ if err != nil {
+ return nil, err
+ }
+
+ offset, err := strconv.ParseInt(fields[2], 16, 0)
+ if err != nil {
+ return nil, err
+ }
+
+ device, err := parseDevice(fields[3])
+ if err != nil {
+ return nil, err
+ }
+
+ inode, err := strconv.ParseUint(fields[4], 10, 0)
+ if err != nil {
+ return nil, err
+ }
+
+ pathname := ""
+
+ if len(fields) >= 5 {
+ pathname = strings.Join(fields[5:], " ")
+ }
+
+ return &ProcMap{
+ StartAddr: saddr,
+ EndAddr: eaddr,
+ Perms: perms,
+ Offset: offset,
+ Dev: device,
+ Inode: inode,
+ Pathname: pathname,
+ }, nil
+}
+
+// ProcMaps reads from /proc/[pid]/maps to get the memory-mappings of the
+// process.
+func (p Proc) ProcMaps() ([]*ProcMap, error) {
+ file, err := os.Open(p.path("maps"))
+ if err != nil {
+ return nil, err
+ }
+ defer file.Close()
+
+ maps := []*ProcMap{}
+ scan := bufio.NewScanner(file)
+
+ for scan.Scan() {
+ m, err := parseProcMap(scan.Text())
+ if err != nil {
+ return nil, err
+ }
+
+ maps = append(maps, m)
+ }
+
+ return maps, nil
+}