mirror of https://gitee.com/openkylin/linux.git
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
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* Licensed under the GPL
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*/
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#include "linux/sched.h"
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#include "linux/shm.h"
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#include "linux/ipc.h"
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#include "linux/syscalls.h"
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#include "asm/mman.h"
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#include "asm/uaccess.h"
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#include "asm/unistd.h"
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/*
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* The prototype on i386 is:
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*
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* int clone(int flags, void * child_stack, int * parent_tidptr, struct user_desc * newtls, int * child_tidptr)
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*
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* and the "newtls" arg. on i386 is read by copy_thread directly from the
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* register saved on the stack.
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*/
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long sys_clone(unsigned long clone_flags, unsigned long newsp,
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int __user *parent_tid, void *newtls, int __user *child_tid)
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{
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long ret;
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if (!newsp)
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newsp = UPT_SP(¤t->thread.regs.regs);
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current->thread.forking = 1;
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ret = do_fork(clone_flags, newsp, ¤t->thread.regs, 0, parent_tid,
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child_tid);
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current->thread.forking = 0;
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return ret;
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}
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long sys_sigaction(int sig, const struct old_sigaction __user *act,
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struct old_sigaction __user *oact)
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{
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struct k_sigaction new_ka, old_ka;
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int ret;
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if (act) {
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old_sigset_t mask;
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if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
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__get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
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__get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
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return -EFAULT;
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__get_user(new_ka.sa.sa_flags, &act->sa_flags);
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__get_user(mask, &act->sa_mask);
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siginitset(&new_ka.sa.sa_mask, mask);
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}
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ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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if (!ret && oact) {
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if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
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__put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
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__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
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return -EFAULT;
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__put_user(old_ka.sa.sa_flags, &oact->sa_flags);
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__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
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}
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return ret;
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}
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