On Tue, 14 Nov 2000, George Young wrote:
> my pygtk app forks and execs another process which it
> wants to completly disassociate from the parent.
> It seems that one of the techniques necessary is for the child to
> dup2 and then close all it's files, e.g.:
> fdnull = open('/dev/null')
> stderr_d = os.dup2(fdnull.fileno(), sys.stderr.fileno())
> stdin_d = os.dup2(fdnull.fileno(), sys.stdin.fileno())
> stdout_d = os.dup2(fdnull.fileno(), sys.stdout.fileno())
> fdnull.close()
> This works fine except for the connection to the X server.
> Guessing and handcoding the number, e.g.:
> foo = os.dup2(fdnull.fileno(), 5)
You probably want to set the FD_CLOEXEC fcntl on all file descriptors >= 3
(as 0,1,2 are stdin,out and err). There is a sysconf call to get the
maximum file descriptor number, but I don't know if this is available from
python. So except for getting the maximum file descriptor number, the
rest can be done with the fcntl and FCNTL modules.
James.
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