Print `errno` name instead of value in GDB

Question

I wonder if there is any way to print errno symbolic name instead of just a number in GDB. For example, instead of

errno = 13

I would like to see something like

EACCES

Answer 1

Assuming you have a recent GDB with embedded Python, you can use the Python interpreter to do what you want.

The following (untested) code should be about right:

(gdb) python import errno
(gdb) python print errno.errorcode[13]

You should be able to define a python command, e.g. perrno, that will cut down on typing. Documentation here.