posix_strerror() (convert error number into error string).
- Do not output any error message if any of the function fails with FALSE
return value. The proper way now is to call posix_errno() and
posix_strerror() after encountering an error condition.
- Function not support on a system no longer issue a 'not available' error
but simply don't exist so we can safely use 'function_exists'.
- Fixed protos.
- Use new parameter parsing API.
- posix_uname() may be aware of 'domainname' (GNU extension)
- posix_getgrnam(), posix_getgrgid(): the returned information does no
longer contains mixture of string and numbered keys (hash / array)
but contains key 'member' with an array of all members in a list
(or an empty array). This breaks BC but is the right thing IMHO.
Draft 3 of IEEE 1003.1 200x, "2.2 The Compilation Environment"
All identifiers that begin with an underscore and either an uppercase
letter or another underscore are always reserved for any use by the
implementation.
