1 files changed, 21 insertions, 0 deletions

diff --git a/vendor/github.com/prometheus/procfs/proc.go b/vendor/github.com/prometheus/procfs/proc.go
index 330e472..9f97b6e 100644
--- a/vendor/github.com/prometheus/procfs/proc.go
+++ b/vendor/github.com/prometheus/procfs/proc.go
@@ -134,6 +134,27 @@ func (p Proc) CmdLine() ([]string, error) {
         return strings.Split(string(bytes.TrimRight(data, string("\x00"))), string(byte(0))), nil
 }
 
+// Wchan returns the wchan (wait channel) of a process.
+func (p Proc) Wchan() (string, error) {
+        f, err := os.Open(p.path("wchan"))
+        if err != nil {
+                return "", err
+        }
+        defer f.Close()
+
+        data, err := ioutil.ReadAll(f)
+        if err != nil {
+                return "", err
+        }
+
+        wchan := string(data)
+        if wchan == "" || wchan == "0" {
+                return "", nil
+        }
+
+        return wchan, nil
+}
+
 // Comm returns the command name of a process.
 func (p Proc) Comm() (string, error) {
         data, err := util.ReadFileNoStat(p.path("comm"))