void syscall_trace_leave(struct pt_regs *regs)
{
if (isaudit(current) && (current->ptrace & PT_AUDITED))
audit_result(regs);
if ((current->ptrace & (PT_PTRACED|PT_TRACESYS)) == (PT_PTRACED|PT_TRACESYS))
syscall_ptrace();
}
/*
* Ok, this is the main fork-routine.
*
* It copies the process, and if successful kick-starts
* it and waits for it to finish using the VM if required.
*/
int do_fork(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size,
int *parent_tidptr,
int *child_tidptr)
{
struct task_struct *p;
int trace = 0;
pid_t pid;
if (unlikely(current->ptrace)) {
trace = fork_traceflag (clone_flags);
if (trace)
clone_flags |= CLONE_PTRACE;
}
p = copy_process(clone_flags, stack_start, regs, stack_size,
parent_tidptr, child_tidptr);
if (unlikely(IS_ERR(p)))
return (int) PTR_ERR(p);
else {
struct completion vfork;
/*
* Do this prior waking up the new thread - the thread pointer
* might get invalid after that point, if the thread exits
* quickly.
*/
pid = p->pid;
if (clone_flags & CLONE_VFORK) {
p->vfork_done = &vfork;
init_completion(&vfork);
}
if ((p->ptrace & PT_PTRACED) || (clone_flags & CLONE_STOPPED)) {
/*
* We'll start up with an immediate SIGSTOP.
*/
sigaddset(&p->pending.signal, SIGSTOP);
p->sigpending = 1;
}
if (isaudit(current))
audit_fork(current, p);
/*
* The task is in TASK_UNINTERRUPTIBLE right now, no-one
* can wake it up. Either wake it up as a child, which
* makes it TASK_RUNNING - or make it TASK_STOPPED, after
* which signals can wake the child up.
*/
if (!(clone_flags & CLONE_STOPPED))
wake_up_forked_process(p); /* do this last */
else
p->state = TASK_STOPPED;
++total_forks;
if (unlikely (trace)) {
current->ptrace_message = (unsigned long) pid;
ptrace_notify((trace << 8) | SIGTRAP);
}
if (clone_flags & CLONE_VFORK) {
wait_for_completion(&vfork);
if (unlikely(current->ptrace & PT_TRACE_VFORK_DONE))
ptrace_notify((PTRACE_EVENT_VFORK_DONE << 8) | SIGTRAP);
} else
/*
* Let the child process run first, to avoid most of the
* COW overhead when the child exec()s afterwards.
*/
set_need_resched();
}
return pid;
}
