check_unshare_flags

Name:Check constraints on flags passed to the unshare system call.

Proto:static int check_unshare_flags(unsigned long unshare_flags)

Type:int

Parameter:

Type	Parameter	Name
unsigned long	unshare_flags

2821

If unshare_flags & ~( Same thread group | set if fs info shared between processes | New mount namespace group | set if signal handlers and blocked signals shared | set if VM shared between processes | set if open files shared between processes | share system V SEM_UNDO semantics | New utsname namespace | New ipc namespace | New network namespace | New user namespace | New pid namespace | New cgroup namespace ) Then Return -EINVAL

2832

If unshare_flags & ( Same thread group | set if signal handlers and blocked signals shared | set if VM shared between processes ) Then

2833

If Not thread_group_empty(current process) Then Return -EINVAL

2836

If unshare_flags & (set if signal handlers and blocked signals shared | set if VM shared between processes ) Then

2837

If _read - get a refcount's value*@r: the refcount* Return: the refcount's value > 1 Then Return -EINVAL

2840

If unshare_flags & set if VM shared between processes Then

2841

If Not Returns true if the task does not share ->mm with another thread/process. Then Return -EINVAL

2845

Return 0

**Caller**
Name	Describe
ksys_unshare	share allows a process to 'unshare' part of the process* context which was originally shared using clone. copy_** functions used by do_fork() cannot be used here directly* because they modify an inactive task_struct that is being* constructed

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