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Filename : sysc_unshare.stp
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# unshare ____________________________________________________
# new function with 2.6.16
# long sys_unshare(unsigned long unshare_flags)

@define _SYSCALL_UNSHARE_NAME
%(
	name = "unshare"
%)

@define _SYSCALL_UNSHARE_ARGSTR
%(
	argstr = unshare_flags_str
%)

@define _SYSCALL_UNSHARE_REGARGS
%(
	unshare_flags = ulong_arg(1)
	unshare_flags_str = __fork_flags(unshare_flags)
%)

probe syscall.unshare = dw_syscall.unshare !, nd_syscall.unshare ? {}
probe syscall.unshare.return = dw_syscall.unshare.return !,
                               nd_syscall.unshare.return ? {}

# dw_unshare _____________________________________________________

probe dw_syscall.unshare = kernel.function("sys_unshare").call ?
{
	@_SYSCALL_UNSHARE_NAME
	unshare_flags = $unshare_flags
	unshare_flags_str = __fork_flags(unshare_flags)
	@_SYSCALL_UNSHARE_ARGSTR
}
probe dw_syscall.unshare.return = kernel.function("sys_unshare").return ?
{
	@_SYSCALL_UNSHARE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_unshare _____________________________________________________

probe nd_syscall.unshare = nd1_syscall.unshare!, nd2_syscall.unshare!, tp_syscall.unshare
  { }

probe nd1_syscall.unshare = kprobe.function("sys_unshare") ?
{
	@_SYSCALL_UNSHARE_NAME
	asmlinkage()
	@_SYSCALL_UNSHARE_REGARGS
	@_SYSCALL_UNSHARE_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.unshare = kprobe.function(@arch_syscall_prefix "sys_unshare") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_UNSHARE_NAME
	@_SYSCALL_UNSHARE_REGARGS
	@_SYSCALL_UNSHARE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unshare = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_unshare"), @const("__NR_compat_unshare"))
	@_SYSCALL_UNSHARE_NAME
	@_SYSCALL_UNSHARE_REGARGS
	@_SYSCALL_UNSHARE_ARGSTR
}

probe nd_syscall.unshare.return = nd1_syscall.unshare.return!, nd2_syscall.unshare.return!, tp_syscall.unshare.return
  { }

probe nd1_syscall.unshare.return = kprobe.function("sys_unshare").return ?
{
	@_SYSCALL_UNSHARE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.unshare.return = kprobe.function(@arch_syscall_prefix "sys_unshare").return ?
{
	@_SYSCALL_UNSHARE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.unshare.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_unshare"), @const("__NR_compat_unshare"))
	@_SYSCALL_UNSHARE_NAME
	@SYSC_RETVALSTR($ret)
}