1/* 
 2 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
 3 * Licensed under the GPL
 4 */
 5
 6#include "linux/sched.h"
 7#include "linux/shm.h"
 8#include "linux/ipc.h"
 9#include "linux/syscalls.h"
10#include "asm/mman.h"
11#include "asm/uaccess.h"
12#include "asm/unistd.h"
13
14/*
15 * The prototype on i386 is:
16 *
17 *     int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr)
18 *
19 * and the "newtls" arg. on i386 is read by copy_thread directly from the
20 * register saved on the stack.
21 */
22long sys_clone(unsigned long clone_flags, unsigned long newsp,
23	       int __user *parent_tid, void *newtls, int __user *child_tid)
24{
25	long ret;
26
27	if (!newsp)
28		newsp = UPT_SP(&current->thread.regs.regs);
29
30	current->thread.forking = 1;
31	ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
32		      child_tid);
33	current->thread.forking = 0;
34	return ret;
35}
36
37long sys_sigaction(int sig, const struct old_sigaction __user *act,
38			 struct old_sigaction __user *oact)
39{
40	struct k_sigaction new_ka, old_ka;
41	int ret;
42
43	if (act) {
44		old_sigset_t mask;
45		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
46		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
47		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
48		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
49		    __get_user(mask, &act->sa_mask))
50			return -EFAULT;
51		siginitset(&new_ka.sa.sa_mask, mask);
52	}
53
54	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
55
56	if (!ret && oact) {
57		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
58		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
59		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
60		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
61		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
62			return -EFAULT;
63	}
64
65	return ret;
66}