On 08/05/09 16:05, Michael Goldish wrote:
Thanks, I managed to reproduce it and I'll send a patch to fix it soon.
The reason for autotest thinking qemu wasn't alive was that apparently it
takes time for /proc/$PID/cmdline to reflect the real command used to
start the process, and I wrongly assumed it was instantaneous.
There is no "command line used to start the process" in unix.
A new process is created using fork().
An process can replace itself with a new executable using execve().
Usual way to start some application in unix is this:
(1) fork()
(2) prepare environment (i/o redirection for example)
(3) execve()
(2)+(3) happen in the new child process created by (1).
/proc/$pid/cmdline will reflect that of course. It will show the qemu
command line once execve(qemu) syscall finished.
HTH,
Gerd
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