Re: About Information Hiding Design Rules

On 3 Jul 2008 at 17:32, Eric Sosman wrote:
Ah, but what value do you store in errno? The values that are
guaranteed to be meaningful are EDOM, EILSEQ, and ERANGE, and that's
all. You could choose other values, positive or negative, but then
the use of perror() and strerror() becomes problematic.

This is just paranoid nonsense. Sensible platforms will provide many,
many useful error numbers, and perror() and strerror() will work just
fine with them.

For example, Linux provides 120 errors for you to choose from, many of
which are inherited from POSIX:

E2BIG Argument list too long
EACCES Permission denied
EADDRINUSE Address already in use
EADDRNOTAVAIL Address not available
EAFNOSUPPORT Address family not supported
EAGAIN Resource temporarily unavailable
EALREADY Connection already in progress
EBADE Invalid exchange
EBADF Bad file descriptor
EBADFD File descriptor in bad state
EBADMSG Bad message
EBADR Invalid request descriptor
EBADRQC Invalid request code
EBADSLT Invalid slot
EBUSY Device or resource busy
ECANCELED Operation canceled
ECHILD No child processes
ECHRNG Channel number out of range
ECOMM Communication error on send
ECONNABORTED Connection aborted
ECONNREFUSED Connection refused
ECONNRESET Connection reset
EDEADLK Resource deadlock avoided
EDEADLOCK Synonym for EDEADLK
EDESTADDRREQ Destination address required
EDOM Mathematics argument out of domain of function C99)
EDQUOT Disk quota exceeded
EEXIST File exists
EFAULT Bad address
EFBIG File too large
EHOSTDOWN Host is down
EHOSTUNREACH Host is unreachable
EIDRM Identifier removed
EILSEQ Illegal byte sequence C99)
EINPROGRESS Operation in progress
EINTR Interrupted function call
EINVAL Invalid argument
EIO Input/output error
EISCONN Socket is connected
EISDIR Is a directory
EISNAM Is a named type file
EKEYEXPIRED Key has expired
EKEYREJECTED Key was rejected by service
EKEYREVOKED Key has been revoked
EL2HLT Level 2 halted
EL2NSYNC Level 2 not synchronized
EL3HLT Level 3 halted
EL3RST Level 3 halted
ELIBACC Cannot access a needed shared library
ELIBBAD Accessing a corrupted shared library
ELIBMAX Attempting to link in too many shared libraries
ELIBSCN lib section in a.out corrupted
ELIBEXEC Cannot exec a shared library directly
ELOOP Too many levels of symbolic links
EMEDIUMTYPE Wrong medium type
EMFILE Too many open files
EMLINK Too many links
EMSGSIZE Message too long
EMULTIHOP Multihop attempted
ENAMETOOLONG Filename too long
ENETDOWN Network is down
ENETRESET Connection aborted by network
ENETUNREACH Network unreachable
ENFILE Too many open files in system
ENOBUFS No buffer space available(XSI STREAMS option))
ENODATA No message is available on the STREAM head read queue
ENODEV No such device
ENOENT No such file or directory
ENOEXEC Exec format error
ENOKEY Required key not available
ENOLCK No locks available
ENOLINK Link has been severed
ENOMEDIUM No medium found
ENOMEM Not enough space
ENOMSG No message of the desired type
ENONET Machine is not on the network
ENOPKG Package not installed
ENOPROTOOPT Protocol not available
ENOSPC No space left on device
ENOSR No STREAM resources(XSI STREAMS option))
ENOSTR Not a STREAM(XSI STREAMS option))
ENOSYS Function not implemented
ENOTBLK Block device required
ENOTCONN The socket is not connected
ENOTDIR Not a directory
ENOTEMPTY Directory not empty
ENOTSOCK Not a socket
ENOTSUP Operation not supported
ENOTTY Inappropriate I/O control operation
ENOTUNIQ Name not unique on network
ENXIO No such device or address
EOPNOTSUPP Operation not supported on socket
EOVERFLOW Value too large to be stored in data type
EPERM Operation not permitted
EPFNOSUPPORT Protocol family not supported
EPIPE Broken pipe
EPROTO Protocol error
EPROTONOSUPPORT Protocol not supported
EPROTOTYPE Protocol wrong type for socket
ERANGE Result too large C99)
EREMCHG Remote address changed
EREMOTE Object is remote
EREMOTEIO Remote I/O error
ERESTART Interrupted system call should be restarted
EROFS Read-only file system
ESHUTDOWN Cannot send after transport endpoint shutdown
ESPIPE Invalid seek
ESOCKTNOSUPPORT Socket type not supported
ESRCH No such process
ESTALE Stale file handle
ESTRPIPE Streams pipe error
ETIME Timer expired
ETIMEDOUT Connection timed out
ETXTBSY Text file busy
EUCLEAN Structure needs cleaning
EUNATCH Protocol driver not attached
EUSERS Too many users
EWOULDBLOCK Operation would block
EXDEV Improper link
EXFULL Exchange full

.

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