Sukadev Bhattiprolu wrote:
> From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
> Date: Mon, 4 May 2009 01:17:44 -0700
> Subject: [RFC][PATCH 6/7][v2] Define do_fork_with_pids()
>
> do_fork_with_pids() is same as do_fork(), except that it takes an
> additional, 'pid_set', parameter. This parameter, currently unused,
> specifies the set of target pids of the process in each of its pid
> namespaces.
>
> Changelog[v2]:
> - [v1] of this patch had some architecture-indpendent code in
> arch/x86/kernel/process_32.c. To facilitate moving this code
> to kernel/fork.c, in the next patch, [v2] of the patch passes
> 'struct target_pid_set __user *' to do_fork_with_pids() instead
> of 'pid_t *'.
>
> Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>
> ---
Reviewed-by: Oren Laadan <orenl@xxxxxxxxxxxxxxx>
> include/linux/sched.h | 1 +
> include/linux/types.h | 5 +++++
> kernel/fork.c | 16 ++++++++++++++--
> 3 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index b4c38bc..8468e54 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -1995,6 +1995,7 @@ extern int disallow_signal(int);
>
> extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *);
> extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
> +extern long do_fork_with_pids(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *, struct target_pid_set __user *pid_set);
> struct task_struct *fork_idle(int);
>
> extern void set_task_comm(struct task_struct *tsk, char *from);
> diff --git a/include/linux/types.h b/include/linux/types.h
> index 5abe354..17ec186 100644
> --- a/include/linux/types.h
> +++ b/include/linux/types.h
> @@ -204,6 +204,11 @@ struct ustat {
> char f_fpack[6];
> };
>
> +struct target_pid_set {
> + int num_pids;
> + pid_t *target_pids;
> +};
> +
> #endif /* __KERNEL__ */
> #endif /* __ASSEMBLY__ */
> #endif /* _LINUX_TYPES_H */
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 373411e..a16ef7b 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1340,12 +1340,13 @@ struct task_struct * __cpuinit fork_idle(int cpu)
> * It copies the process, and if successful kick-starts
> * it and waits for it to finish using the VM if required.
> */
> -long do_fork(unsigned long clone_flags,
> +long do_fork_with_pids(unsigned long clone_flags,
> unsigned long stack_start,
> struct pt_regs *regs,
> unsigned long stack_size,
> int __user *parent_tidptr,
> - int __user *child_tidptr)
> + int __user *child_tidptr,
> + struct target_pid_set __user *pid_setp)
> {
> struct task_struct *p;
> int trace = 0;
> @@ -1448,6 +1449,17 @@ long do_fork(unsigned long clone_flags,
> return nr;
> }
>
> +long do_fork(unsigned long clone_flags,
> + unsigned long stack_start,
> + struct pt_regs *regs,
> + unsigned long stack_size,
> + int __user *parent_tidptr,
> + int __user *child_tidptr)
> +{
> + return do_fork_with_pids(clone_flags, stack_start, regs, stack_size,
> + parent_tidptr, child_tidptr, NULL);
> +}
> +
> #ifndef ARCH_MIN_MMSTRUCT_ALIGN
> #define ARCH_MIN_MMSTRUCT_ALIGN 0
> #endif
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