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Filename : sysc_getppid.stp
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# getppid ____________________________________________________
# long sys_getppid(void)

@define _SYSCALL_GETPPID_NAME
%(
	name = "getppid"
%)

@define _SYSCALL_GETPPID_ARGSTR
%(
	argstr = ""
%)

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

# dw_getppid _____________________________________________________

probe dw_syscall.getppid = kernel.function("sys_getppid").call
{
	@_SYSCALL_GETPPID_NAME
	@_SYSCALL_GETPPID_ARGSTR
}
probe dw_syscall.getppid.return = kernel.function("sys_getppid").return
{
	@_SYSCALL_GETPPID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getppid _____________________________________________________

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

probe nd1_syscall.getppid = kprobe.function("sys_getppid")
{
	@_SYSCALL_GETPPID_NAME
	@_SYSCALL_GETPPID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getppid = kprobe.function(@arch_syscall0_prefix "sys_getppid") ?
{
	@_SYSCALL_GETPPID_NAME
	@_SYSCALL_GETPPID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getppid = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_getppid"), @const("__NR_compat_getppid"))
	@_SYSCALL_GETPPID_NAME
	@_SYSCALL_GETPPID_ARGSTR
}

probe nd_syscall.getppid.return = nd1_syscall.getppid.return!, nd2_syscall.getppid.return!, tp_syscall.getppid.return
  { }
  
probe nd1_syscall.getppid.return = kprobe.function("sys_getppid").return
{
	@_SYSCALL_GETPPID_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.getppid.return = kprobe.function(@arch_syscall0_prefix "sys_getppid").return ?
{
	@_SYSCALL_GETPPID_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getppid.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_getppid"), @const("__NR_compat_getppid"))
	@_SYSCALL_GETPPID_NAME
	@SYSC_RETVALSTR($ret)
}