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In error cases, dasdview returns -1 which results in the return value 255. This is due to the fact that only the low-order 8 bits are used for the status value. See 2.13 Status Information [1] in the POSIX standard and the exit() POSIX man page [2] for more details. Instead of returning -1, use the EXIT_FAILURE constant to indicate unsuccessful termination properly. This change also makes the exit status consistent for all error cases in dasdview, as some exit() calls already use EXIT_FAILURE. [1]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html [2]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/exit.html Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>