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 REDHAT
strerror
STRERROR(3) Linux Programmer's Manual STRERROR(3)
NAME
strerror, strerror_r - return string describing error code
SYNOPSIS
#include <string.h>
char *strerror(int errnum);
int strerror_r(int errnum, char *buf, size_t n);
DESCRIPTION
The strerror() function returns a string describing the error code passed in the argument errnum, possibly using the LC_MESSAGES part of
the current locale to select the appropriate language. This string must not be modified by the application, but may be modified by a sub-
sequent call to perror() or strerror(). No library function will modify this string.
The strerror_r() function is similar to strerror(), but is thread safe. It returns the string in the user-supplied buffer buf of length n.
RETURN VALUE
The strerror() function returns the appropriate error description string, or an unknown error message if the error code is unknown. The
value of errno is not changed for a successful call, and is set to a nonzero value upon error. The strerror_r() function returns 0 on suc-
cess and -1 on failure, setting errno.
ERRORS
EINVAL The value of errnum is not a valid error number.
ERANGE Insufficient storage was supplied to contain the error description string.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO/IEC 9899:1990 (C89).
strerror_r() with prototype as given above is specified by SUSv3, and was in use under Digital Unix and HP Unix. An incompatible function,
with prototype
char *strerror_r(int errnum, char *buf, size_t n);
is a GNU extension used by glibc (since 2.0), and must be regarded as obsolete in view of SUSv3. The GNU version may, but need not, use
the user-supplied buffer. If it does, the result may be truncated in case the supplied buffer is too small. The result is always NUL-ter-
minated.
SEE ALSO
errno(3), perror(3), strsignal(3)
2001-10-16 STRERROR(3)