From 7ddb4d64810f3e58b43798de7f2dc2bf67df59d5 Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 3 Feb 2009 12:48:06 +0200
Subject: Added errno.

---
 errno   | 16 ++++++++++++++++
 errno.1 | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100755 errno
 create mode 100644 errno.1

diff --git a/errno b/errno
new file mode 100755
index 0000000..2a39e2f
--- /dev/null
+++ b/errno
@@ -0,0 +1,16 @@
+#!/usr/bin/python
+
+import errno
+import os
+import sys
+
+toname = dict((str(getattr(errno, x)), x) for x in dir(errno) if x.startswith("E"))
+tocode = dict((x, getattr(errno, x)) for x in dir(errno) if x.startswith("E"))
+
+for arg in sys.argv[1:]:
+    if arg in tocode:
+        print arg, tocode[arg], os.strerror(tocode[arg])
+    elif arg in toname:
+        print toname[arg], arg, os.strerror(int(arg))
+    else:
+        print "Unknown:", arg
diff --git a/errno.1 b/errno.1
new file mode 100644
index 0000000..aefb0ff
--- /dev/null
+++ b/errno.1
@@ -0,0 +1,51 @@
+.\" errno.1 - manual page for the errno command
+.\" Copyright (C) 2009  Lars Wirzenius
+.\"
+.\" This program is free software: you can redistribute it and/or modify
+.\" it under the terms of the GNU General Public License as published by
+.\" the Free Software Foundation, either version 3 of the License, or
+.\" (at your option) any later version.
+.\"
+.\" This program is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public License
+.\" along with this program.  If not, see <http://www.gnu.org/licenses/>.
+.\"
+.TH ERRNO 1
+.SH NAME
+errno \- look up errno codes or names
+.SH SYNOPSIS
+.B errno
+.RI [ code | name ]...
+.SH DESCRIPTION
+.B errno
+prints the description of 
+.BR errno (3)
+values, from the command line.
+It can look descriptions based on the numeric code or names like
+.BR EEXIST .
+.PP
+For example, to look up what the code 2 means:
+.sp 1
+.nf
+.RS
+$ errno 2
+ENOENT 2 No such file or directory
+.RE
+.fi
+.sp 1
+Similarly, to look up what the code EEXIST means:
+.sp 1
+.nf
+.RS
+$ errno EEXIST
+EEXIST 17 File exists
+.RE
+.fi
+.sp 1
+Note that the output always lists both the name and the code.
+.SH "SEE ALSO"
+.BR errno (3).
-- 
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