^^&&^^

Edit File: sysc_fcntl.stp

# fcntl ______________________________________________________
# long sys_fcntl(int fd, unsigned int cmd, unsigned long arg)
# long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
# long compat_sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
# long compat_sys_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg)
#

@define _SYSCALL_FCNTL_NAME
%(
	name = "fcntl"
%)

@define _SYSCALL_FCNTL_ARGSTR
%(
	argstr = sprintf("%d, %s, %p", fd, cmd_str, arg)
%)

@define _SYSCALL_FCNTL_REGARGS
%(
	fd = int_arg(1)
	cmd = int_arg(2)
	cmd_str = _fcntl_cmd_str(cmd)
	arg = long_arg(3)
%)

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

# dw_fcntl _____________________________________________________

probe dw_syscall.fcntl = __dw_syscall.fcntl,
                         kernel.function("compat_sys_fcntl").call ?,
                         kernel.function("compat_sys_fcntl64").call ?
{
	@_SYSCALL_FCNTL_NAME
	fd = __int32($fd)
	cmd = __int32($cmd)
	cmd_str = _fcntl_cmd_str(cmd)
	arg = @__pointer($arg)
	@_SYSCALL_FCNTL_ARGSTR
}
probe __dw_syscall.fcntl = kernel.function("sys_fcntl64").call ?,
                           kernel.function("sys_fcntl").call ?
{
	@__syscall_gate_compat_simple
}

probe dw_syscall.fcntl.return = __dw_syscall.fcntl.return,
                                kernel.function("compat_sys_fcntl").return ?,
                                kernel.function("compat_sys_fcntl64").return ?
{
	@_SYSCALL_FCNTL_NAME
	@SYSC_RETVALSTR($return)
}
probe __dw_syscall.fcntl.return = kernel.function("sys_fcntl64").return ?,
                                  kernel.function("sys_fcntl").return ?
{
	@__syscall_gate_compat_simple
}

# nd_fcntl _____________________________________________________

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

probe nd1_syscall.fcntl = __nd1_syscall.fcntl,
                         kprobe.function("compat_sys_fcntl") ?,
                         kprobe.function("compat_sys_fcntl64") ?
{
	@_SYSCALL_FCNTL_NAME
	asmlinkage()
	@_SYSCALL_FCNTL_REGARGS
	@_SYSCALL_FCNTL_ARGSTR
}
probe __nd1_syscall.fcntl = kprobe.function("sys_fcntl64") ?,
                           kprobe.function("sys_fcntl") ?
{
	@__syscall_gate_compat_simple
}

/* kernel 4.17+ */
probe nd2_syscall.fcntl = kprobe.function(@arch_syscall_prefix "sys_fcntl") ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_fcntl64") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_FCNTL_NAME
	@_SYSCALL_FCNTL_REGARGS
	@_SYSCALL_FCNTL_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fcntl = __tp_syscall.fcntl, __tp_syscall.fcntl64
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_FCNTL_NAME
	@_SYSCALL_FCNTL_REGARGS
	@_SYSCALL_FCNTL_ARGSTR
}
probe __tp_syscall.fcntl = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_fcntl"), @const("__NR_compat_fcntl"))
}
probe __tp_syscall.fcntl64 = kernel.trace("sys_enter")
{
	@__syscall_compat_gate(@const("__NR_fcntl64"), @const("__NR_compat_fcntl64"))
}

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

probe nd1_syscall.fcntl.return = __nd1_syscall.fcntl.return,
                                kprobe.function("compat_sys_fcntl").return ?,
                                kprobe.function("compat_sys_fcntl64").return ?
{
	@_SYSCALL_FCNTL_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.fcntl.return = kprobe.function("sys_fcntl64").return ?,
                                  kprobe.function("sys_fcntl").return ?
{
	@__syscall_gate_compat_simple
}

/* kernel 4.17+ */
probe nd2_syscall.fcntl.return = kprobe.function(@arch_syscall_prefix "sys_fcntl").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_fcntl64").return ?
{
	@_SYSCALL_FCNTL_NAME
	@SYSC_RETVALSTR(returnval())
}
 
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fcntl.return = __tp_syscall.fcntl.return, __tp_syscall.fcntl64.return
{
	__set_syscall_pt_regs($regs)
	@_SYSCALL_FCNTL_NAME
	@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.fcntl.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_fcntl"), @const("__NR_compat_fcntl"))
}
probe __tp_syscall.fcntl64.return = kernel.trace("sys_exit")
{
	@__syscall_compat_gate(@const("__NR_fcntl64"), @const("__NR_compat_fcntl64"))
}