# exitCode property

Future<int> exitCode

Returns a `Future` which completes with the exit code of the process when the process completes.

The handling of exit codes is platform specific.

On Linux and OS X a normal exit code will be a positive value in the range `0..255`. If the process was terminated due to a signal the exit code will be a negative value in the range `-255..-1`, where the absolute value of the exit code is the signal number. For example, if a process crashes due to a segmentation violation the exit code will be -11, as the signal SIGSEGV has the number 11.

On Windows a process can report any 32-bit value as an exit code. When returning the exit code this exit code is turned into a signed value. Some special values are used to report termination due to some system event. E.g. if a process crashes due to an access violation the 32-bit exit code is `0xc0000005`, which will be returned as the negative number `-1073741819`. To get the original 32-bit value use `(0x100000000 + exitCode) & 0xffffffff`.

## Implementation

    Future<int> get exitCode;