^^&&^^

Edit File: sysc_vhangup.stp

# vhangup ____________________________________________________
#
# asmlinkage long
# sys_vhangup(void)
#

@define _SYSCALL_VHANGUP_NAME
%(
	name = "vhangup"
%)

@define _SYSCALL_VHANGUP_ARGSTR
%(
	argstr = ""
%)

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

# dw_vhangup _____________________________________________________

probe dw_syscall.vhangup = kernel.function("sys_vhangup").call
{
	@_SYSCALL_VHANGUP_NAME
	@_SYSCALL_VHANGUP_ARGSTR
}
probe dw_syscall.vhangup.return = kernel.function("sys_vhangup").return
{
	@_SYSCALL_VHANGUP_NAME
	@SYSC_RETVALSTR($return)
}

# nd_vhangup _____________________________________________________

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

probe nd1_syscall.vhangup = kprobe.function("sys_vhangup")
{
	@_SYSCALL_VHANGUP_NAME
	@_SYSCALL_VHANGUP_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.vhangup = kprobe.function(@arch_syscall0_prefix "sys_vhangup") ?
{
	@_SYSCALL_VHANGUP_NAME
	@_SYSCALL_VHANGUP_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.vhangup = kernel.trace("sys_enter") ?
{
	@__syscall_compat_gate(@const("__NR_vhangup"), @const("__NR_compat_vhangup"))
	@_SYSCALL_VHANGUP_NAME
	@_SYSCALL_VHANGUP_ARGSTR
}

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

probe nd1_syscall.vhangup.return = kprobe.function("sys_vhangup").return
{
	@_SYSCALL_VHANGUP_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.vhangup.return = kprobe.function(@arch_syscall0_prefix "sys_vhangup").return ?
{
	@_SYSCALL_VHANGUP_NAME
	@SYSC_RETVALSTR(returnval())
}

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