1#@!#!123s

: / usr / share / systemtap / tapset / linux /
Filename : sysc_wait4.stp
back
# wait4 ______________________________________________________
#
# long sys_wait4(pid_t pid,
#	     int __user *stat_addr,
#	     int options,
#	     struct rusage __user *ru)
# COMPAT_SYSCALL_DEFINE4(wait4,
#	compat_pid_t, pid,
#	compat_uint_t __user *, stat_addr,
#	int, options,
#	struct compat_rusage __user *, ru)
#

@define _SYSCALL_WAIT4_NAME
%(
	name = "wait4"
%)

@define _SYSCALL_WAIT4_ARGSTR
%(
	argstr = sprintf("%d, %p, %s, %p", pid, status_uaddr,
	                 options_str, rusage_uaddr)
%)

@define _SYSCALL_WAIT4_REGARGS
%(
	pid = int_arg(1)
	status_uaddr = pointer_arg(2)
	options = int_arg(3)
	options_str = _wait4_opt_str(options)
	rusage_uaddr = pointer_arg(4)
%)

probe syscall.wait4 = dw_syscall.wait4 !, nd_syscall.wait4 ? {}
probe syscall.wait4.return = dw_syscall.wait4.return !,
                             nd_syscall.wait4.return ? {}

# dw_wait4 _____________________________________________________

probe dw_syscall.wait4 = __syscall.wait4, __syscall.compat_wait4 ?
{
	@_SYSCALL_WAIT4_NAME
	pid = __int32(@choose_defined($upid, $pid))
	status_uaddr = @__pointer($stat_addr)
	options = __int32($options)
	options_str = _wait4_opt_str(options)
	rusage_uaddr = @__pointer($ru)
	@_SYSCALL_WAIT4_ARGSTR
}
probe __syscall.wait4 = kernel.function("sys_wait4").call
{
	@__syscall_gate(@const("__NR_wait4"))
}
probe __syscall.compat_wait4 = kernel.function("compat_sys_wait4").call ?
{
	@__compat_syscall_gate(@const("__NR_compat_wait4"))
}
probe dw_syscall.wait4.return = __syscall.wait4.return,
	__syscall.compat_wait4.return ?
{
	@_SYSCALL_WAIT4_NAME

	if (returnval () <= 0)
		status_str = "N/A"
	else if (@entry($stat_addr) == 0)
		status_str = "NULL"
	else
		status_str = _wait_status_str(user_int(@entry($stat_addr)))

	@SYSC_RETVALSTR($return)
}
probe __syscall.wait4.return = kernel.function("sys_wait4").return
{
	@__syscall_gate(@const("__NR_wait4"))
}
probe __syscall.compat_wait4.return =
	kernel.function("compat_sys_wait4").return ?
{
	@__compat_syscall_gate(@const("__NR_compat_wait4"))
}

# nd_wait4 _____________________________________________________

probe nd_syscall.wait4 = nd1_syscall.wait4!, nd2_syscall.wait4!, tp_syscall.wait4
  { }

probe nd1_syscall.wait4 = __nd1_syscall.wait4, __nd1_syscall.compat_wait4 ?
{
	@_SYSCALL_WAIT4_NAME
	asmlinkage()
	@_SYSCALL_WAIT4_REGARGS
	@_SYSCALL_WAIT4_ARGSTR
}
probe __nd1_syscall.wait4 = kprobe.function("sys_wait4")
{
	@__syscall_gate(@const("__NR_wait4"))
}
probe __nd1_syscall.compat_wait4 = kprobe.function("compat_sys_wait4") ?
{
	@__compat_syscall_gate(@const("__NR_compat_wait4"))
}

probe nd2_syscall.wait4 = kprobe.function(@arch_syscall_prefix "sys_wait4") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_wait4") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_WAIT4_NAME
	@_SYSCALL_WAIT4_REGARGS
	@_SYSCALL_WAIT4_ARGSTR
}

probe tp_syscall.wait4 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_wait4"), @const("__NR_compat_wait4"))
	@_SYSCALL_WAIT4_NAME
	@_SYSCALL_WAIT4_REGARGS
	@_SYSCALL_WAIT4_ARGSTR
}

probe nd_syscall.wait4.return = nd1_syscall.wait4.return!, nd2_syscall.wait4.return!, tp_syscall.wait4.return
  { }

probe nd1_syscall.wait4.return = __nd1_syscall.wait4.return,
	__nd1_syscall.compat_wait4.return ?
{
	@_SYSCALL_WAIT4_NAME

	asmlinkage()
	status_uaddr = pointer_arg(2)
	if (returnval () <= 0)
		status_str = "N/A"
	else if (status_uaddr == 0)
		status_str = "NULL"
	else
		status_str = _wait_status_str(user_int(status_uaddr))

	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.wait4.return = kprobe.function("sys_wait4").return
{
	@__syscall_gate(@const("__NR_wait4"))
}
probe __nd1_syscall.compat_wait4.return =
	kprobe.function("compat_sys_wait4").return ?
{
	@__compat_syscall_gate(@const("__NR_compat_wait4"))
}

probe nd2_syscall.wait4.return = kprobe.function(@arch_syscall_prefix "sys_wait4").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_wait4").return ?
{
	@_SYSCALL_WAIT4_NAME

	__set_syscall_pt_regs(@entry(pointer_arg(1)))
	status_uaddr = pointer_arg(2)
	if (returnval () <= 0)
		status_str = "N/A"
	else if (status_uaddr == 0)
		status_str = "NULL"
	else
		status_str = _wait_status_str(user_int(status_uaddr))

	@SYSC_RETVALSTR(returnval())
}

probe tp_syscall.wait4.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_wait4"), @const("__NR_compat_wait4"))
	@_SYSCALL_WAIT4_NAME

	status_uaddr = pointer_arg(2)
	if (returnval () <= 0)
		status_str = "N/A"
	else if (status_uaddr == 0)
		status_str = "NULL"
	else
		status_str = _wait_status_str(user_int(status_uaddr))

	@SYSC_RETVALSTR($ret)
}