From fee80e90dc7357edcadbc27c03b80558a6dd391f Mon Sep 17 00:00:00 2001
From: Guido Trotter <ultrotter@google.com>
Date: Wed, 23 Jul 2008 14:23:18 +0000
Subject: [PATCH] Add utils.IsPidFileAlive function
This helper function reads a pid from a file containing it and checks
whether it refers to a live process.
Reviewed-by: iustinp
---
lib/utils.py | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/lib/utils.py b/lib/utils.py
index 7548a7e15..05240eabb 100644
--- a/lib/utils.py
+++ b/lib/utils.py
@@ -290,6 +290,31 @@ def IsProcessAlive(pid):
return alive
+def IsPidFileAlive(pidfile):
+ """Check whether the given pidfile points to a live process.
+
+ @param pidfile: Path to a file containing the pid to be checked
+ @type pidfile: string (filename)
+
+ """
+ try:
+ pf = open(pidfile, 'r')
+ except EnvironmentError, open_err:
+ if open_err.errno == errno.ENOENT:
+ return False
+ else:
+ raise errors.GenericError("Cannot open file %s. Error: %s" %
+ (pidfile, str(open_err)))
+
+ try:
+ pid = int(pf.read())
+ except ValueError:
+ raise errors.GenericError("Invalid pid string in %s" %
+ (pidfile,))
+
+ return IsProcessAlive(pid)
+
+
def MatchNameComponent(key, name_list):
"""Try to match a name against a list.
--
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