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Filename : sysc_kill.stp
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# kill _______________________________________________________
# long sys_kill(int pid, int sig)

@define _SYSCALL_KILL_NAME
%(
	name = "kill"
%)

@define _SYSCALL_KILL_ARGSTR
%(
	argstr = sprintf("%d, %s", pid, sig_name)
%)

@define _SYSCALL_KILL_REGARGS
%(
	pid = int_arg(1)
	sig = int_arg(2)
	sig_name = _signal_name(sig)
%)

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

# dw_kill _____________________________________________________

probe dw_syscall.kill = kernel.function("sys_kill").call
{
	@_SYSCALL_KILL_NAME
	pid = __int32($pid)
	sig = __int32($sig)
	sig_name = _signal_name(sig)
	@_SYSCALL_KILL_ARGSTR
}
probe dw_syscall.kill.return = kernel.function("sys_kill").return
{
	@_SYSCALL_KILL_NAME
	@SYSC_RETVALSTR($return)
}

# nd_kill _____________________________________________________

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

probe nd1_syscall.kill = kprobe.function("sys_kill") ?
{
	@_SYSCALL_KILL_NAME
	asmlinkage()
	@_SYSCALL_KILL_REGARGS
	@_SYSCALL_KILL_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.kill = kprobe.function(@arch_syscall_prefix "sys_kill") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_KILL_NAME
	@_SYSCALL_KILL_REGARGS
	@_SYSCALL_KILL_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.kill = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_kill"), @const("__NR_compat_kill"))
	@_SYSCALL_KILL_NAME
	@_SYSCALL_KILL_REGARGS
	@_SYSCALL_KILL_ARGSTR
}

probe nd_syscall.kill.return = nd1_syscall.kill.return!, nd2_syscall.kill.return!, tp_syscall.kill.return
  { }
  
probe nd1_syscall.kill.return = kprobe.function("sys_kill").return ?
{
	@_SYSCALL_KILL_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.kill.return = kprobe.function(@arch_syscall_prefix "sys_kill").return ?
{
	@_SYSCALL_KILL_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.kill.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_kill"), @const("__NR_compat_kill"))
	@_SYSCALL_KILL_NAME
	@SYSC_RETVALSTR($ret)
}