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(¤t->thread.regs.regs); 29 30 current->thread.forking = 1; 31 ret = do_fork(clone_flags, newsp, ¤t->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 return -EFAULT; 49 __get_user(new_ka.sa.sa_flags, &act->sa_flags); 50 __get_user(mask, &act->sa_mask); 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 return -EFAULT; 61 __put_user(old_ka.sa.sa_flags, &oact->sa_flags); 62 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask); 63 } 64 65 return ret; 66} 67