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Filename : sysc_getpgid.stp
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# getpgid ____________________________________________________
# long sys_getpgid(pid_t pid)

@define _SYSCALL_GETPGID_NAME
%(
	name = "getpgid"
%)

@define _SYSCALL_GETPGID_ARGSTR
%(
	argstr = sprintf("%d", pid)
%)

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

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

# dw_getpgid _____________________________________________________

probe dw_syscall.getpgid = kernel.function("sys_getpgid").call
{
	@__syscall_compat_gate(@const("__NR_getpgid"), @const("__NR_compat_getpgid"))
	@_SYSCALL_GETPGID_NAME
	pid = __int32($pid)
	@_SYSCALL_GETPGID_ARGSTR
}
probe dw_syscall.getpgid.return = kernel.function("sys_getpgid").return
{
	@__syscall_compat_gate(@const("__NR_getpgid"), @const("__NR_compat_getpgid"))
	@_SYSCALL_GETPGID_NAME
	@SYSC_RETVALSTR($return)
}

# nd_getpgid _____________________________________________________

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

probe nd1_syscall.getpgid = kprobe.function("sys_getpgid") ?
{
	@__syscall_compat_gate(@const("__NR_getpgid"), @const("__NR_compat_getpgid"))
	@_SYSCALL_GETPGID_NAME
	asmlinkage()
	@_SYSCALL_GETPGID_REGARGS
	@_SYSCALL_GETPGID_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.getpgid = kprobe.function(@arch_syscall_prefix "sys_getpgid") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_GETPGID_NAME
	@_SYSCALL_GETPGID_REGARGS
	@_SYSCALL_GETPGID_ARGSTR
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.getpgid = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_getpgid"), @const("__NR_compat_getpgid"))
	@_SYSCALL_GETPGID_NAME
	@_SYSCALL_GETPGID_REGARGS
	@_SYSCALL_GETPGID_ARGSTR
}

probe nd_syscall.getpgid.return = nd1_syscall.getpgid.return!, nd2_syscall.getpgid.return!, tp_syscall.getpgid.return
  { }
  
probe nd1_syscall.getpgid.return = kprobe.function("sys_getpgid").return ?
{
	@__syscall_compat_gate(@const("__NR_getpgid"), @const("__NR_compat_getpgid"))
	@_SYSCALL_GETPGID_NAME
	@SYSC_RETVALSTR(returnval())
}

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