^^&&^^

Edit File: sysc_gettid.stp

# gettid _____________________________________________________
# long sys_gettid(void)

@define _SYSCALL_GETTID_NAME
%(
	name = "gettid"
%)

@define _SYSCALL_GETTID_ARGSTR
%(
	argstr = ""
%)

probe syscall.gettid = dw_syscall.gettid !, nd_syscall.gettid {}
probe syscall.gettid.return = dw_syscall.gettid.return !,
                              nd_syscall.gettid.return {}

# dw_gettid _____________________________________________________

probe dw_syscall.gettid = kernel.function("sys_gettid").call
{
	@_SYSCALL_GETTID_NAME
	@_SYSCALL_GETTID_ARGSTR
}
probe dw_syscall.gettid.return = kernel.function("sys_gettid").return
{
	@_SYSCALL_GETTID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_gettid _____________________________________________________

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

probe nd1_syscall.gettid = kprobe.function("sys_gettid")
{
	@_SYSCALL_GETTID_NAME
	@_SYSCALL_GETTID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.gettid = kprobe.function(@arch_syscall0_prefix "sys_gettid") ?
{
	@_SYSCALL_GETTID_NAME
	@_SYSCALL_GETTID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.gettid = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_gettid"), @const("__NR_compat_gettid"))
	@_SYSCALL_GETTID_NAME
	@_SYSCALL_GETTID_ARGSTR
}

probe nd_syscall.gettid.return = nd1_syscall.gettid.return!, nd2_syscall.gettid.return!, tp_syscall.gettid.return
  { }
  
probe nd1_syscall.gettid.return = kprobe.function("sys_gettid").return
{
	@_SYSCALL_GETTID_NAME
	@SYSC_RETVALSTR(returnval())
}

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