^^&&^^

Edit File: sysc_setdomainname.stp

# setdomainname ______________________________________________
#
# asmlinkage long
# sys_setdomainname(char __user *name,
#			 int len)
#

@define _SYSCALL_SETDOMAINNAME_NAME
%(
	name = "setdomainname"
%)

@define _SYSCALL_SETDOMAINNAME_ARGSTR
%(
	argstr = sprintf("%s, %d", domainname_str, len)
%)

@define _SYSCALL_SETDOMAINNAME_REGARGS
%(
	domainname_uaddr = pointer_arg(1)
%( systemtap_v <= "2.8" %?
        hostname_uaddr = domainname_uaddr
%)
	domainname_str = user_string_quoted(domainname_uaddr)
	len = int_arg(2)
%)

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

# dw_setdomainname _____________________________________________________

probe dw_syscall.setdomainname = kernel.function("sys_setdomainname").call
{
	@_SYSCALL_SETDOMAINNAME_NAME
	domainname_uaddr = $name
%( systemtap_v <= "2.8" %?
	hostname_uaddr = domainname_uaddr
%)
        domainname_str = user_string_quoted(domainname_uaddr)
	len = __int32($len)
	@_SYSCALL_SETDOMAINNAME_ARGSTR
}
probe dw_syscall.setdomainname.return = kernel.function("sys_setdomainname").return
{
	@_SYSCALL_SETDOMAINNAME_NAME
	@SYSC_RETVALSTR($return)
}

# nd_setdomainname _____________________________________________________

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

probe nd1_syscall.setdomainname = kprobe.function("sys_setdomainname") ?
{
	@_SYSCALL_SETDOMAINNAME_NAME
	asmlinkage()
	@_SYSCALL_SETDOMAINNAME_REGARGS
	@_SYSCALL_SETDOMAINNAME_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.setdomainname = kprobe.function(@arch_syscall_prefix "sys_setdomainname") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_SETDOMAINNAME_NAME
	@_SYSCALL_SETDOMAINNAME_REGARGS
	@_SYSCALL_SETDOMAINNAME_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.setdomainname = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_setdomainname"), @const("__NR_compat_setdomainname"))
	@_SYSCALL_SETDOMAINNAME_NAME
	@_SYSCALL_SETDOMAINNAME_REGARGS
	@_SYSCALL_SETDOMAINNAME_ARGSTR
}

probe nd_syscall.setdomainname.return = nd1_syscall.setdomainname.return!, nd2_syscall.setdomainname.return!, tp_syscall.setdomainname.return
  { }
  
probe nd1_syscall.setdomainname.return = kprobe.function("sys_setdomainname").return ?
{
	@_SYSCALL_SETDOMAINNAME_NAME
	@SYSC_RETVALSTR(returnval())
}

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