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Filename : sysc_inotify_add_watch.stp
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# inotify_add_watch __________________________________________
#
# long sys_inotify_add_watch(int fd, const char __user *path, u32 mask)
#

@define _SYSCALL_INOTIFY_ADD_WATCH_NAME
%(
	name = "inotify_add_watch"
%)

@define _SYSCALL_INOTIFY_ADD_WATCH_ARGSTR
%(
	argstr = sprintf("%d, %s, %s", fd, path, mask_str)
%)

@define _SYSCALL_INOTIFY_ADD_WATCH_REGARGS
%(
	fd = int_arg(1)
	mask = uint_arg(3)
	mask_str = _inotify_watch_mask_str(mask)
	path_uaddr = pointer_arg(2)
	path = user_string_quoted(path_uaddr)
%)

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

# dw_inotify_add_watch _____________________________________________________

probe dw_syscall.inotify_add_watch = kernel.function("sys_inotify_add_watch").call ?
{
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	fd = __int32($fd)
	mask = __uint32($mask)
	mask_str = _inotify_watch_mask_str(mask)
	path_uaddr = @choose_defined($pathname, $path)
	path = user_string_quoted(@choose_defined($pathname, $path))
	@_SYSCALL_INOTIFY_ADD_WATCH_ARGSTR
}

probe dw_syscall.inotify_add_watch.return = kernel.function("sys_inotify_add_watch").return ?
{
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	@SYSC_RETVALSTR($return)
}

# nd_inotify_add_watch _____________________________________________________

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

probe nd1_syscall.inotify_add_watch = kprobe.function("sys_inotify_add_watch") ?
{
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	asmlinkage()
	@_SYSCALL_INOTIFY_ADD_WATCH_REGARGS
	@_SYSCALL_INOTIFY_ADD_WATCH_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.inotify_add_watch = kprobe.function(@arch_syscall_prefix "sys_inotify_add_watch") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	@_SYSCALL_INOTIFY_ADD_WATCH_REGARGS
	@_SYSCALL_INOTIFY_ADD_WATCH_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.inotify_add_watch = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_inotify_add_watch"), @const("__NR_compat_inotify_add_watch"))
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	@_SYSCALL_INOTIFY_ADD_WATCH_REGARGS
	@_SYSCALL_INOTIFY_ADD_WATCH_ARGSTR
}

probe nd_syscall.inotify_add_watch.return = nd1_syscall.inotify_add_watch.return!, nd2_syscall.inotify_add_watch.return!, tp_syscall.inotify_add_watch.return
  { }
  
probe nd1_syscall.inotify_add_watch.return = kprobe.function("sys_inotify_add_watch").return ?
{
	@_SYSCALL_INOTIFY_ADD_WATCH_NAME
	@SYSC_RETVALSTR(returnval())
}

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