System.exit()


Exit code is
  • 0 when execution went fine;
  • 1, -1, whatever != 0 when some error occurred, you can use different values for different kind of errors.
If I'm correct exit codes used to be just positive numbers (I mean in UNIX) and according to range:
  • 1-127 are user defined codes (so generated by calling exit(n))
  • 128-255 are codes generated by termination due to different unix signals like SIGSEGV or SIGTERM
The following codes are from http://www.opensource.apple.com/source/Libc/Libc-320/include/sysexits.h.
Note Ref: http://stackoverflow.com/questions/2434592/difference-in-system-exit0-system-exit-1-system-exit1-in-java

sysexits.h   [plain text]

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * Copyright (c) 1987, 1993
 * The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * This product includes software developed by the University of
 * California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * @(#)sysexits.h 8.1 (Berkeley) 6/2/93
 */

#ifndef _SYSEXITS_H_
#define _SYSEXITS_H_

/*
 *  SYSEXITS.H -- Exit status codes for system programs.
 *
 * This include file attempts to categorize possible error
 * exit statuses for system programs, notably delivermail
 * and the Berkeley network.
 *
 * 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 */

#endif /* !_SYSEXITS_H_ */

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