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SubjectRe: [RFD] Combined fork-exec syscall.
Mark Grosberg wrote:
> fmap[0] = in[0]; /* STDIN */
> fmap[1] = out[1]; /* STDOUT */
> fmap[2] = open("/dev/null", O_RDWR); /* STDERR */
> fmap[3] = -1; /* end */
>
> p = nexec("/bin/cat",
> null_argv,
> NULL,
> filmap);

How about

fdrplc(3,fmap);
exec("/bin/cat",...);

?

0) System call names must be short and cryptic :-)
1) Requiring the kernel to iterate over the array element by element
in order to find out how big it is may be inefficient. Better to
pass the length.
2) System call overhead is marginal, particularly in this case.
3) There may be other uses than exec(2), where a way for closeing
all fds and getting a new set may be useful.

- Werner

--
_________________________________________________________________________
/ Werner Almesberger, Buenos Aires, Argentina wa@almesberger.net /
/_http://www.almesberger.net/____________________________________________/
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