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Edit File: sysc_ftruncate.stp

# ftruncate __________________________________________________
# long sys_ftruncate(unsigned int fd, unsigned long length)
# COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_ulong_t, length)
#

@define _SYSCALL_FTRUNCATE_NAME
%(
	name = "ftruncate"
%)

@define _SYSCALL_FTRUNCATE_ARGSTR
%(
	argstr = sprintf("%d, %d", fd, length)
%)

@define _SYSCALL_FTRUNCATE_REGARGS
%(
	fd = int_arg(1)
	length = @__compat_task ? int_arg(2) : long_arg(2)
%)

@define _SYSCALL_FTRUNCATE64_REGARGS
%(
	fd = int_arg(1)
	length = longlong_arg(2)
%)

@define _SYSCALL_GATE
%(
    %( arch == "x86_64" || arch == "s390" %?
	// On x86_64 and s390x RHL6 kernels, the 32-bit compat
	// ftruncate syscall is hooked up directly to sys_ftruncate(),
	// instead of going through compat_sys_ftruncate().
	@__syscall_compat_gate(@const("__NR_ftruncate"),
			       @const("__NR_compat_ftruncate"))
    %:
	@__syscall_gate_compat_simple
    %)
%)

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

# dw_ftruncate _____________________________________________________

probe dw_syscall.ftruncate = __syscall.ftruncate,
	kernel.function("compat_sys_ftruncate").call ?
{
	@_SYSCALL_FTRUNCATE_NAME
	fd = __int32($fd)
	length = @__compat_long($length)
	@_SYSCALL_FTRUNCATE_ARGSTR
}
probe __syscall.ftruncate = kernel.function("sys_ftruncate").call
{
	@_SYSCALL_GATE
}
probe dw_syscall.ftruncate.return = __syscall.ftruncate.return,
	kernel.function("compat_sys_ftruncate").return ?
{
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR($return)
}
probe __syscall.ftruncate.return = kernel.function("sys_ftruncate").return
{
	@_SYSCALL_GATE
}

# nd_ftruncate _____________________________________________________

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

probe nd1_syscall.ftruncate = __nd1_syscall.ftruncate,
	kprobe.function("compat_sys_ftruncate").call?
{
	@_SYSCALL_FTRUNCATE_NAME
	asmlinkage()
	@_SYSCALL_FTRUNCATE_REGARGS
	@_SYSCALL_FTRUNCATE_ARGSTR
}
probe __nd1_syscall.ftruncate = kprobe.function("sys_ftruncate").call
{
	@_SYSCALL_GATE
}

/* kernel 4.17+ */
probe nd2_syscall.ftruncate =
	kprobe.function(@arch_syscall_prefix "sys_ftruncate") ?,
	kprobe.function(@arch_syscall_prefix "comapt_sys_ftruncate") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_FTRUNCATE_NAME
	@_SYSCALL_FTRUNCATE_REGARGS
	@_SYSCALL_FTRUNCATE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ftruncate = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ftruncate"),
			       @const("__NR_compat_ftruncate"))
	@_SYSCALL_FTRUNCATE_NAME
	@_SYSCALL_FTRUNCATE_REGARGS
	@_SYSCALL_FTRUNCATE_ARGSTR
}

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

probe nd1_syscall.ftruncate.return = __nd1_syscall.ftruncate.return,
	kprobe.function("compat_sys_ftruncate").return ?
{
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.ftruncate.return = kprobe.function("sys_ftruncate").return
{
	@_SYSCALL_GATE
}

/* kernel 4.17+ */
probe nd2_syscall.ftruncate.return =
	kprobe.function(@arch_syscall_prefix "sys_ftruncate").return ?,
	kprobe.function(@arch_syscall_prefix "compat_sys_ftruncate").return ?
{
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ftruncate.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_ftruncate"),
			       @const("__NR_compat_ftruncate"))
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR($ret)
}

# ftruncate64 ________________________________________________
# long sys_ftruncate64(unsigned int fd, loff_t length)

probe syscall.ftruncate64 = dw_syscall.ftruncate64 !, nd_syscall.ftruncate64 ? {}
probe syscall.ftruncate64.return = dw_syscall.ftruncate64.return !, nd_syscall.ftruncate64.return ? {}

# dw_ftruncate64 _____________________________________________________

probe dw_syscall.ftruncate64 = kernel.function("sys_ftruncate64").call ?
{
	@_SYSCALL_FTRUNCATE_NAME
	fd = __int32($fd)
	length = $length
	@_SYSCALL_FTRUNCATE_ARGSTR
}
probe dw_syscall.ftruncate64.return = kernel.function("sys_ftruncate64").return ?
{
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR($return)
}

# nd_ftruncate64 _____________________________________________________

probe nd_syscall.ftruncate64 = nd1_syscall.ftruncate64!, nd2_syscall.ftruncate64!, tp_syscall.ftruncate64
  { }

probe nd1_syscall.ftruncate64 = kprobe.function("sys_ftruncate64") ?
{
	@_SYSCALL_FTRUNCATE_NAME
	asmlinkage()
	@_SYSCALL_FTRUNCATE64_REGARGS
	@_SYSCALL_FTRUNCATE_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ftruncate64 = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_ftruncate64"))
	@_SYSCALL_FTRUNCATE_NAME
	@_SYSCALL_FTRUNCATE64_REGARGS
	@_SYSCALL_FTRUNCATE_ARGSTR
}

probe nd_syscall.ftruncate64.return = nd1_syscall.ftruncate64.return!, nd2_syscall.ftruncate64.return!, tp_syscall.ftruncate64.return
  { }

probe nd1_syscall.ftruncate64.return =
	kprobe.function("sys_ftruncate64").return ?
{
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.ftruncate64.return = kernel.trace("sys_exit")
{
	__set_syscall_pt_regs($regs)
	@__syscall_gate(@const("__NR_ftruncate64"))
	@_SYSCALL_FTRUNCATE_NAME
	@SYSC_RETVALSTR($ret)
}