/*
 *  linux/kernel/vserver/signal.c
 *
 *  Virtual Server: Signal Support
 *
 *  Copyright (C) 2003-2004  Herbert Pötzl
 *
 *  V0.01  broken out from vcontext V0.05
 *
 */

#include <linux/config.h>
#include <linux/sched.h>

#include <asm/errno.h>
#include <asm/uaccess.h>

#include <linux/vinline.h>
#include <linux/vserver/signal.h>


int vc_ctx_kill(uint32_t id, void *data)
{
	int retval, count=0;
	struct vcmd_ctx_kill_v0 vc_data;
	struct siginfo info;
	struct task_struct *p;
	struct vx_info *vxi;

	if (!vx_check(0, VX_ADMIN))
		return -ENOSYS;
	if (copy_from_user (&vc_data, data, sizeof(vc_data)))
		return -EFAULT;
	
	info.si_signo = vc_data.sig;
	info.si_errno = 0;
	info.si_code = SI_USER;
	info.si_pid = current->pid;
	info.si_uid = current->uid;

	vxi = find_vx_info(id);
	if (!vxi)
		return -ESRCH;

	retval = -ESRCH;
	read_lock(&tasklist_lock);
	switch (vc_data.pid) {
	case -1:
	case  0:
		for_each_task(p) {
			int err = 0;

			if (vx_task_xid(p) != id || p->pid <= 1 ||
				(vc_data.pid && vxi->vx_initpid == p->pid) ||
				!thread_group_leader(p))
				continue;

			err = send_sig_info(vc_data.sig, &info, p);
			++count;
			if (err != -EPERM)
				retval = err;
		}
		break;
		
	default:
	p = find_task_by_pid(vc_data.pid);
		if (p) {
			if (!thread_group_leader(p)) {
				struct task_struct *tg;
			
				tg = find_task_by_pid(p->tgid);
				if (tg)
					p = tg;
			}
			if ((id == -1) || (vx_task_xid(p) == id))
				retval = send_sig_info(vc_data.sig, &info, p);
		}
		break;
	}
	read_unlock(&tasklist_lock);
	put_vx_info(vxi);
	return retval;
}