> From: Jan Alexander Steffens [mailto:jan.steff...@gmail.com] > > On Thu, Jul 4, 2013 at 2:04 AM, Paul D. DeRocco > <pdero...@ix.netcom.com> wrote: > > 1) I want my service executable to be copied from flash to > > RAM disk, and > > then executed from there, so that the original can be > > updated while the copy is running. > > You don't need to copy it to somewhere else. You can replace an > executable without the running process being disturbed, by deleting > the file and creating (or moving) a new one in its place. Most tools > (like "cp") will do this when they overwrite a file. Then simply > restart the service (or have it exec() itself), and the new version > will be running. > > The old version of the executable will continue to exist-even though > it has no file name-until nothing uses it anymore.
Is that true on all filesystems? This is a FAT16 volume on a flash drive in an embedded system. It's also possible that the power might get yanked while it's in this state, leaving an orphan file. Finally, since it will be updated via a Samba file share, I don't know what sort of command will be used to change it; it might be an overwrite plus lengthen or truncate operation. -- Ciao, Paul D. DeRocco Paul mailto:pdero...@ix.netcom.com _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
