11-09-2011
No. I'm saying that is expected behavior for POSIX compliant systems. CentOS does not claim to be fully POSIX-compliant.
It is a mix of of open-source components mostly from linux distributions. The code has been modified and then incorporated into the CentOS distibution.
The behavior you have is not compliant as far as I can see.
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LEARN ABOUT SUSE
strerror
STRERROR(3) Linux Programmer's Manual STRERROR(3)
NAME
strerror, strerror_r - return string describing error number
SYNOPSIS
#include <string.h>
char *strerror(int errnum);
int strerror_r(int errnum, char *buf, size_t buflen);
/* XSI-compliant */
char *strerror_r(int errnum, char *buf, size_t buflen);
/* GNU-specific */
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
The XSI-compliant version of strerror_r() is provided if:
(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) && ! _GNU_SOURCE
Otherwise, the GNU-specific version is provided.
DESCRIPTION
The strerror() function returns a pointer to a string that describes 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 subsequent call to perror(3) or strerror(). No library function will modify this string.
The strerror_r() function is similar to strerror(), but is thread safe. This function is available in two versions: an XSI-compliant ver-
sion specified in POSIX.1-2001 (available since glibc 2.3.4), and a GNU-specific version (available since glibc 2.0). The XSI-compliant
version is provided with the feature test macros settings shown in the SYNOPSIS; otherwise the GNU-specific version is provided. If no
feature test macros are explicitly defined, then (since glibc 2.4) _POSIX_SOURCE is defined by default with the value 200112L, so that the
XSI-compliant version of strerror_r() is provided by default.
The XSI-compliant strerror_r() is preferred for portable applications. It returns the error string in the user-supplied buffer buf of
length buflen.
The GNU-specific strerror_r() returns a pointer to a string containing the error message. This may be either a pointer to a string that
the function stores in buf, or a pointer to some (immutable) static string (in which case buf is unused). If the function stores a string
in buf, then at most buflen bytes are stored (the string may be truncated if buflen is too small) and the string always includes a termi-
nating null byte.
RETURN VALUE
The strerror() and the GNU-specific strerror_r() functions return the appropriate error description string, or an "Unknown error nnn" mes-
sage if the error number is unknown.
The XSI-compliant strerror_r() function returns 0 on success; on error, -1 is returned and errno is set to indicate the error.
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
strerror() is specified by POSIX.1-2001, C89, C99. strerror_r() is specified by POSIX.1-2001.
The GNU-specific strerror_r() function is a nonstandard extension.
POSIX.1-2001 permits strerror() to set errno if the call encounters an error, but does not specify what value should be returned as the
function result in the event of an error. On some systems, strerror() returns NULL if the error number is unknown. On other systems, str-
error() returns a string something like "Error nnn occurred" and sets errno to EINVAL if the error number is unknown.
SEE ALSO
err(3), errno(3), error(3), perror(3), strsignal(3)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2009-03-30 STRERROR(3)