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Dir : ~/usr/share/systemtap/tapset/linux/

Edit File: sysc_flock.stp

# flock ______________________________________________________
# long sys_flock(unsigned int fd, unsigned int cmd)

@define _SYSCALL_FLOCK_NAME
%(
	name = "flock"
%)

@define _SYSCALL_FLOCK_ARGSTR
%(
	argstr = sprintf("%d, %s", fd, _flock_cmd_str(operation))
%)

@define _SYSCALL_FLOCK_REGARGS
%(
	fd = int_arg(1)
	operation = int_arg(2)
%)

@define _SYSCALL_FLOCK_REGARGS_STORE
%(
        if (@probewrite(fd))
          set_int_arg(1, fd)

if (@probewrite(operation))
	  set_int_arg(2, operation)
%)

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

# dw_flock _____________________________________________________

probe dw_syscall.flock = kernel.function("sys_flock").call
{
	@_SYSCALL_FLOCK_NAME
	fd = __int32($fd)
	operation = $cmd
	@_SYSCALL_FLOCK_ARGSTR
}
probe dw_syscall.flock.return = kernel.function("sys_flock").return
{
	@_SYSCALL_FLOCK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_flock _____________________________________________________

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

probe nd1_syscall.flock = kprobe.function("sys_flock") ?
{
	@_SYSCALL_FLOCK_NAME
	asmlinkage()
	@_SYSCALL_FLOCK_REGARGS
	@_SYSCALL_FLOCK_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.flock = kprobe.function(@arch_syscall_prefix "sys_flock") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_FLOCK_NAME
	@_SYSCALL_FLOCK_REGARGS
	@_SYSCALL_FLOCK_ARGSTR
},
{
        @_SYSCALL_FLOCK_REGARGS_STORE
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.flock = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_flock"), @const("__NR_compat_flock"))
	@_SYSCALL_FLOCK_NAME
	@_SYSCALL_FLOCK_REGARGS
	@_SYSCALL_FLOCK_ARGSTR
},
{
        @_SYSCALL_FLOCK_REGARGS_STORE
}

probe nd_syscall.flock.return = nd1_syscall.flock.return!, nd2_syscall.flock.return!, tp_syscall.flock.return
  { }
  
probe nd1_syscall.flock.return = kprobe.function("sys_flock").return ?
{
	@_SYSCALL_FLOCK_NAME
	@SYSC_RETVALSTR(returnval())
}

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