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: / usr / share / systemtap / tapset / linux /
Filename : sysc_eventfd.stp
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# eventfd _____________________________________________________
# long sys_eventfd(unsigned int count)
# SYSCALL_DEFINE2(eventfd2, unsigned int, count, int, flags)

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

# dw_eventfd _____________________________________________________

probe dw_syscall.eventfd = __syscall.eventfd2 ?, __syscall.eventfd ?
{
}
probe __syscall.eventfd2 = kernel.function("sys_eventfd2").call
{
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
	count = __uint32($count)
	flags = __int32($flags)
	flags_str = _eventfd2_flag_str(flags)
	argstr = sprintf("%u, %s", count, _eventfd2_flag_str(flags))
}
probe __syscall.eventfd = kernel.function("sys_eventfd").call
{
	name = "eventfd"
	count = __uint32($count)
	flags = 0
	flags_str = "0x0"
	argstr = sprint(count)
}
probe dw_syscall.eventfd.return = __syscall.eventfd2.return ?,
			       __syscall.eventfd.return ?
{
	@SYSC_RETVALSTR($return)
}
probe __syscall.eventfd2.return = kernel.function("sys_eventfd2").return
{
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
}
probe __syscall.eventfd.return = kernel.function("sys_eventfd").return
{
	name = "eventfd"
}

# nd_eventfd _____________________________________________________

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

probe nd1_syscall.eventfd = __nd1_syscall.eventfd2 ?, __nd1_syscall.eventfd ?
{
}
probe __nd1_syscall.eventfd2 = kprobe.function("sys_eventfd2")
{
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
	asmlinkage()
	count = uint_arg(1)
	flags = int_arg(2)
	flags_str = _eventfd2_flag_str(flags)
	argstr = sprintf("%u, %s", count, flags_str)
}
probe __nd1_syscall.eventfd = kprobe.function("sys_eventfd")
{
	name = "eventfd"
	asmlinkage()
	count = uint_arg(1)
	flags = 0
	flags_str = "0x0"
	argstr = sprint(count)
}

/* kernel 4.17+ */
probe nd2_syscall.eventfd = __nd2_syscall.eventfd2 ?, __nd2_syscall.eventfd ?
{
}
probe __nd2_syscall.eventfd2 = kprobe.function(@arch_syscall_prefix "sys_eventfd2") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	name = "eventfd2"
	count = uint_arg(1)
	flags = int_arg(2)
	flags_str = _eventfd2_flag_str(flags)
	argstr = sprintf("%u, %s", count, flags_str)
}
probe __nd2_syscall.eventfd = kprobe.function(@arch_syscall_prefix "sys_eventfd")
{
	__set_syscall_pt_regs(pointer_arg(1))
	name = "eventfd"
	count = uint_arg(1)
	flags = 0
	flags_str = "0x0"
	argstr = sprint(count)
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.eventfd = __tp_syscall.eventfd2 ?, __tp_syscall.eventfd ?
{
}
probe __tp_syscall.eventfd2 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
	count = uint_arg(1)
	flags = int_arg(2)
	flags_str = _eventfd2_flag_str(flags)
	argstr = sprintf("%u, %s", count, flags_str)
}
probe __tp_syscall.eventfd = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_eventfd"), @const("__NR_compat_eventfd"))
	name = "eventfd"
	count = uint_arg(1)
	flags = 0
	flags_str = "0x0"
	argstr = sprint(count)
}
 
probe nd_syscall.eventfd.return = nd1_syscall.eventfd.return!, nd2_syscall.eventfd.return!, tp_syscall.eventfd.return
  { }
  
probe nd1_syscall.eventfd.return = __nd1_syscall.eventfd2.return ?,
                                  __nd1_syscall.eventfd.return ?
{
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.eventfd2.return = kprobe.function("sys_eventfd2").return
{
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
}
probe __nd1_syscall.eventfd.return = kprobe.function("sys_eventfd").return
{
	name = "eventfd"
}

/* kernel 4.17+ */
probe nd2_syscall.eventfd.return = __nd2_syscall.eventfd2.return ?,
                                  __nd2_syscall.eventfd.return ?
{
	@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.eventfd2.return = kprobe.function(@arch_syscall_prefix "sys_eventfd2").return
{
	name = "eventfd2"
}
probe __nd2_syscall.eventfd.return = kprobe.function(@arch_syscall_prefix "sys_eventfd").return
{
	name = "eventfd"
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.eventfd.return = __tp_syscall.eventfd2.return ?,
                                  __tp_syscall.eventfd.return ?
{
	__set_syscall_pt_regs($regs)
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.eventfd2.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_eventfd2"), @const("__NR_compat_eventfd2"))
	name = "eventfd2"
}
probe __tp_syscall.eventfd.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_eventfd"), @const("__NR_compat_eventfd"))
	name = "eventfd"
}