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

Edit File: sysc_sgetmask.stp

# sgetmask ___________________________________________________
#
# sys_sgetmask(void)
#

@define _SYSCALL_SGETMASK_NAME
%(
	name = "sgetmask"
%)

@define _SYSCALL_SGETMASK_ARGSTR
%(
	argstr = ""
%)

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

# dw_sgetmask _____________________________________________________

probe dw_syscall.sgetmask = kernel.function("sys_sgetmask").call ?
{
	@_SYSCALL_SGETMASK_NAME
	@_SYSCALL_SGETMASK_ARGSTR
}
probe dw_syscall.sgetmask.return = kernel.function("sys_sgetmask").return ?
{
	@_SYSCALL_SGETMASK_NAME
	@SYSC_RETVALSTR($return)
}

# nd_sgetmask _____________________________________________________

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

probe nd1_syscall.sgetmask = kprobe.function("sys_sgetmask") ?
{
	@_SYSCALL_SGETMASK_NAME
	@_SYSCALL_SGETMASK_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.sgetmask = kprobe.function(@arch_syscall0_prefix "sys_sgetmask") ?
{
	@_SYSCALL_SGETMASK_NAME
	@_SYSCALL_SGETMASK_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.sgetmask = kernel.trace("sys_enter") ?
{
	@__syscall_compat_gate(@const("__NR_sgetmask"), @const("__NR_compat_sgetmask"))
	@_SYSCALL_SGETMASK_NAME
	@_SYSCALL_SGETMASK_ARGSTR
}

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

probe nd1_syscall.sgetmask.return = kprobe.function("sys_sgetmask").return ?
{
	@_SYSCALL_SGETMASK_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.sgetmask.return = kprobe.function(@arch_syscall0_prefix "sys_sgetmask").return ?
{
	@_SYSCALL_SGETMASK_NAME
	@SYSC_RETVALSTR(returnval())
}

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