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Filename : sysc_tgkill.stp
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# tgkill _____________________________________________________
#
# asmlinkage long
# sys_tgkill(int tgid,
#            int pid,
#            int sig)
#

@define _SYSCALL_TGKILL_NAME
%(
	name = "tgkill"
%)

@define _SYSCALL_TGKILL_ARGSTR
%(
	argstr = sprintf("%d, %d, %s", tgid, pid, sig_str)
%)

@define _SYSCALL_TGKILL_REGARGS
%(
	tgid = int_arg(1)
	pid = int_arg(2)
	sig = int_arg(3)
	sig_str = _signal_name(sig)
%)

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

# dw_tgkill _____________________________________________________

probe dw_syscall.tgkill = kernel.function("sys_tgkill").call
{
	@_SYSCALL_TGKILL_NAME
	tgid = __int32($tgid)
	pid = __int32($pid)
	sig = __int32($sig)
	sig_str = _signal_name(sig)
	@_SYSCALL_TGKILL_ARGSTR
}
probe dw_syscall.tgkill.return = kernel.function("sys_tgkill").return
{
	@_SYSCALL_TGKILL_NAME
	@SYSC_RETVALSTR($return)
}

# nd_tgkill _____________________________________________________

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

probe nd1_syscall.tgkill = kprobe.function("sys_tgkill") ?
{
	@_SYSCALL_TGKILL_NAME
	asmlinkage()
	@_SYSCALL_TGKILL_REGARGS
	@_SYSCALL_TGKILL_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.tgkill = kprobe.function(@arch_syscall_prefix "sys_tgkill") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_TGKILL_NAME
	@_SYSCALL_TGKILL_REGARGS
	@_SYSCALL_TGKILL_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.tgkill = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_tgkill"), @const("__NR_compat_tgkill"))
	@_SYSCALL_TGKILL_NAME
	@_SYSCALL_TGKILL_REGARGS
	@_SYSCALL_TGKILL_ARGSTR
}

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

probe nd1_syscall.tgkill.return = kprobe.function("sys_tgkill").return ?
{
	@_SYSCALL_TGKILL_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.tgkill.return = kprobe.function(@arch_syscall_prefix "sys_tgkill").return ?
{
	@_SYSCALL_TGKILL_NAME
	@SYSC_RETVALSTR(returnval())
}

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