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SubjectRe: [RFC][v8][PATCH 10/10]: Document clone3() syscall
Arnd Bergmann [arndbergmann@googlemail.com] wrote:
| On Tuesday 13 October 2009, Sukadev Bhattiprolu wrote:
| > +clone3(struct clone_struct * __user clone_args, pid_t * __user pids)
| > +
| > + In addition to doing everything that clone() system call does,
| > + the clone3() system call:
| > +
| > + - allows additional clone flags (all 32 bits in the flags
| > + parameter to clone() are in use)
| > +
| > + - allows user to specify a pid for the child process in its
| > + active and ancestor pid name spaces.
|
| Someone (sorry, can't find the old mail) pointed out last time that
| the 'pid_t *__user tidptr' argument needs to be an independent pointer,
| in order to allow the same use patterns with CLONE_CHILD_SETTID and
| CLONE_CHILD_CLEARTID that you can do with the current clone
| implementation.

I think it was Oren Laadan.

|
| Moving that argument from clone_struct into the argument list would
| also make this a three-argument syscall, which solves the naming problem.

How about we pull 'nr_pids' out of clone_args struct and make that
a separate parameter. It seems the odd man out and controls the pid_t
list parameter.
|
| Arnd <><


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