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Filename : sysc_getsid.stp
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# getsid _____________________________________________________
# long sys_getsid(pid_t pid)

@define _SYSCALL_GETSID_NAME
%(
	name = "getsid"
%)

@define _SYSCALL_GETSID_ARGSTR
%(
	argstr = sprint(pid)
%)

@define _SYSCALL_GETSID_REGARGS
%(
	pid = int_arg(1)
%)

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

# dw_getsid _____________________________________________________

probe dw_syscall.getsid = kernel.function("sys_getsid").call
{
	@_SYSCALL_GETSID_NAME
	pid = __int32($pid)
	@_SYSCALL_GETSID_ARGSTR
}
probe dw_syscall.getsid.return = kernel.function("sys_getsid").return
{
	@_SYSCALL_GETSID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getsid _____________________________________________________

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

probe nd1_syscall.getsid = kprobe.function("sys_getsid") ?
{
	@_SYSCALL_GETSID_NAME
	asmlinkage()
	@_SYSCALL_GETSID_REGARGS
	@_SYSCALL_GETSID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getsid = kprobe.function(@arch_syscall_prefix "sys_getsid") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_GETSID_NAME
	@_SYSCALL_GETSID_REGARGS
	@_SYSCALL_GETSID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getsid = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_getsid"), @const("__NR_compat_getsid"))
	@_SYSCALL_GETSID_NAME
	@_SYSCALL_GETSID_REGARGS
	@_SYSCALL_GETSID_ARGSTR
}

probe nd_syscall.getsid.return = nd1_syscall.getsid.return!, nd2_syscall.getsid.return!, tp_syscall.getsid.return
  { }
  
probe nd1_syscall.getsid.return = kprobe.function("sys_getsid").return ?
{
	@_SYSCALL_GETSID_NAME
	@SYSC_RETVALSTR(returnval())
}

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