Whats the difference between System.exit(99) & System.exit(-1)

At least on Linux and Solaris systems the difference is important:
exit(0) : successful termination of the program.
exit(n) called with a value 0 < n < 128 :
program terminated with an error. The values in use should be
described in the program's documentation
exit(n) called with a value 128 <= n <= 255 :
Some system event occured (e.g.: program terminated by a signal).
On a Solaris SPARC nachine you will find the following helpful macros in the file
/usr/include/sys/wait.h:
#define WIFEXITED(stat) ((int)((stat)&0xFF) == 0)
#define WIFSIGNALED(stat) ((int)((stat)&0xFF) > 0 && \
(int)((stat)&0xFF00) == 0)
#define WIFSTOPPED(stat) ((int)((stat)&0xFF) == 0177 && \
(int)((stat)&0xFF00) != 0)
#define WEXITSTATUS(stat) ((int)(((stat)>>8)&0xFF))
#define WTERMSIG(stat) ((int)((stat)&0x7F))
#define WSTOPSIG(stat) ((int)(((stat)>>8)&0xFF))
Best,
Manfred

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