Prefix the error string message with either "chdir" or the "execvXX"-
family function that failed. In order to simplify the process, I also
made it transmit local 8-bit data instead of UTF-16 (this also avoids
memory allocation with QString).
Since there are now two write(2) calls, it's possible for the parent
process to be woken up and read(2) only the first. The parent process
now needs to wait for EOF.
Change-Id: Ib306f8f647014b399b87ffff13f1956199a5aee0
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
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