@node strerror_r
@section @code{strerror_r}
@findex strerror_r

POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/strerror_r.html}

Gnulib module: strerror_r-posix

Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
NetBSD 3.0, HP-UX 11.23, IRIX 6.5, Solaris 9, mingw.
@item
glibc has an incompatible version of this function.  The POSIX compliant code
@smallexample
char *s = (strerror_r (err, buf, buflen) == 0 ? buf : NULL);
@end smallexample
is essentially equivalent to this code using the glibc function:
@smallexample
char *s = strerror_r (err, buf, buflen);
@end smallexample
@item
This function is sometimes not declared in @code{<string.h>} on some platforms:
glibc 2.8, OSF/1 5.1.
@item
The third argument is of type @code{int} instead of @code{size_t} on some
platforms:
AIX 5.1, OSF/1 5.1.
@item
When this function fails, it returns -1 and sets @code{errno}, instead of
returning the error number, on some platforms:
glibc 2.8 with @code{-D_POSIX_C_SOURCE=200112L}, AIX 6.1, OSF/1 5.1.
@item
This function does not support the error values that are specified by POSIX
but not defined by the system, on some platforms:
OpenBSD 4.0, OSF/1 5.1, NonStop Kernel, Cygwin 1.5.x.
@item
This function always fails when the third argument is less than 80 on some
platforms:
HP-UX 11.31.
@item
When the buffer is too small, this function does not fail, but instead
truncates the result and returns 0 on some platforms:
OSF/1 5.1.
@end itemize

Portability problems not fixed by Gnulib:
@itemize
@item
When the buffer is too small, this function does not fail, but instead
truncates the result and returns 0 on some platforms:
AIX 6.1.
@end itemize
