Hello, * Paul Eggert wrote on Mon, Nov 15, 2010 at 07:30:55PM CET: > > One problem I forsee is that, if the script is modified in place, > the modification can occur while the shell is reading the script. > So one must first create the desired script as a separate file, > and then atomically rename it over the original, so that the shell > can continue to access the original script as needed via its > already-open file descriptor.
Sounds like it won't work on w32, and likely not on NFS either. > Even here, though, > I worry that POSIX does not say that a shell must open a script and > then access it only via a file descriptor: as far as I > can see, it's valid (though admittedly weird) for a shell to reopen > its script as needed, in which case the atomic-rename approach is > not reliable either. Exactly. What might work is have bootstrap exec a temporary script that updates bootstrap then exec's that again. Cheers, Ralf
