01-28-2013
Where exactly the string is stored is implementation-defined and shouldn't matter to you as an application developer.
sys_errlist is in stdio.h (see 'man sys_errlist'). It is initialized before your main() function is called. I don't know whether it's "editable" or not - frankly I cannot think of any reason that this would be anything other than a terrible, terrible idea.
What exactly are you trying to achieve here - what's the end-goal for this line of enquiry?
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LEARN ABOUT CENTOS
sys_nerr
PERROR(3) Linux Programmer's Manual PERROR(3)
NAME
perror - print a system error message
SYNOPSIS
#include <stdio.h>
void perror(const char *s);
#include <errno.h>
const char *sys_errlist[];
int sys_nerr;
int errno;
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
sys_errlist, sys_nerr: _BSD_SOURCE
DESCRIPTION
The routine perror() produces a message on the standard error output, describing the last error encountered during a call to a system or
library function. First (if s is not NULL and *s is not a null byte ('