Linux has bad errno documentation, so instead of dig for code meaning just do strerror.

strerror.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int
main(int argc, char **argv)
{
        if (argc > 1)
                printf("err %s\n", strerror(atoi(argv[1])));
        else
                printf("Usage: %s errno\n", argv[0]);
        return (0);
}