From f04750bb7af45cb6efab8d92d1ff063f0bf2833d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=A1clav=20Barto=C5=A1?= <bartos@cesnet.cz>
Date: Tue, 14 Jan 2020 18:57:04 +0100
Subject: [PATCH] bpo-38361: syslog: fixed making default "ident" from
 sys.argv[0] (GH-16557)

The default value of "ident" parameter should be sys.argv[0] with leading path
components stripped, but it contained the last slash, i.e. '/program' instead
of 'program'.

BPO issue: https://bugs.python.org/issue38361


https://bugs.python.org/issue38361
---
 .../next/Library/2019-10-04-09-49-56.bpo-38361.LM4u4T.rst       | 1 +
 Modules/syslogmodule.c                                          | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2019-10-04-09-49-56.bpo-38361.LM4u4T.rst

diff --git a/Misc/NEWS.d/next/Library/2019-10-04-09-49-56.bpo-38361.LM4u4T.rst b/Misc/NEWS.d/next/Library/2019-10-04-09-49-56.bpo-38361.LM4u4T.rst
new file mode 100644
index 00000000000..65186db60b4
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2019-10-04-09-49-56.bpo-38361.LM4u4T.rst
@@ -0,0 +1 @@
+Fixed an issue where ``ident`` could include a leading path separator when :func:`syslog.openlog` was called without arguments.
\ No newline at end of file
diff --git a/Modules/syslogmodule.c b/Modules/syslogmodule.c
index b2ea73baa1b..539224f2c5b 100644
--- a/Modules/syslogmodule.c
+++ b/Modules/syslogmodule.c
@@ -99,7 +99,7 @@ syslog_get_argv(void)
     if (slash == -2)
         return NULL;
     if (slash != -1) {
-        return PyUnicode_Substring(scriptobj, slash, scriptlen);
+        return PyUnicode_Substring(scriptobj, slash + 1, scriptlen);
     } else {
         Py_INCREF(scriptobj);
         return(scriptobj);