/**
 * sysexits.h
 *
 * Error numbers begin at EX__BASE to reduce the possibility of
 * clashing with other exit statuses that random programs may
 * already return.  The meaning of the codes is approximately
 * as follows:
 *
 * EX_USAGE -- The command was used incorrectly, e.g., with
 *    the wrong number of arguments, a bad flag, a bad
 *    syntax in a parameter, or whatever.
 * EX_DATAERR -- The input data was incorrect in some way.
 *    This should only be used for user's data & not
 *    system files.
 * EX_NOINPUT -- An input file (not a system file) did not
 *    exist or was not readable. This could also include
 *    errors like "No message" to a mailer (if it cared
 *    to catch it).
 * EX_NOUSER -- The user specified did not exist. This might
 *    be used for mail addresses or remote logins.
 * EX_NOHOST -- The host specified did not exist. This is used
 *    in mail addresses or network requests.
 * EX_UNAVAILABLE -- A service is unavailable. This can occur
 *    if a support program or file does not exist. This
 *    can also be used as a catchall message when something
 *    you wanted to do doesn't work, but you don't know
 *    why.
 * EX_SOFTWARE -- An internal software error has been detected.
 *    This should be limited to non-operating system related
 *    errors as possible.
 * EX_OSERR -- An operating system error has been detected.
 *    This is intended to be used for such things as "cannot
 *    fork", "cannot create pipe", or the like. It includes
 *    things like getuid returning a user that does not
 *    exist in the passwd file.
 * EX_OSFILE -- Some system file (e.g., /etc/passwd, /etc/utmp,
 *    etc.) does not exist, cannot be opened, or has some
 *    sort of error (e.g., syntax error).
 * EX_CANTCREAT -- A (user specified) output file cannot be
 *    created.
 * EX_IOERR -- An error occurred while doing I/O on some file.
 * EX_TEMPFAIL -- temporary failure, indicating something that
 *    is not really an error. In sendmail, this means
 *    that a mailer (e.g.) could not create a connection,
 *    and the request should be reattempted later.
 * EX_PROTOCOL -- the remote system returned something that
 *    was "not possible" during a protocol exchange.
 * EX_NOPERM -- You did not have sufficient permission to
 *    perform the operation. This is not intended for
 *    file system problems, which should use NOINPUT or
 *    CANTCREAT, but rather for higher level permissions.
 */
#define EX_OK            0  // successful termination
#define EX__BASE         64 // base value for error messages
#define EX_USAGE         64 // command line usage error
#define EX_DATAERR       65 // data format error
#define EX_NOINPUT       66 // cannot open input
#define EX_NOUSER        67 // addressee unknown
#define EX_NOHOST        68 // host name unknown
#define EX_UNAVAILABLE   69 // service unavailable
#define EX_SOFTWARE      70 // internal software error
#define EX_OSERR         71 // system error (e.g., can't fork)
#define EX_OSFILE        72 // critical OS file missing
#define EX_CANTCREAT     73 // can't create (user) output file
#define EX_IOERR         74 // input/output error
#define EX_TEMPFAIL      75 // temp failure; user is invited to retry
#define EX_PROTOCOL      76 // remote error in protocol
#define EX_NOPERM        77 // permission denied
#define EX_CONFIG        78 // configuration error
#define EX__MAX          78 // maximum listed value