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|
# fork _______________________________________________________
#
# SYSCALL_DEFINE0(fork)
#
@define _SYSCALL_FORK_NAME
%(
name = "fork"
%)
@define _SYSCALL_FORK_ARGSTR
%(
argstr = ""
%)
probe syscall.fork = dw_syscall.fork !, nd_syscall.fork ? {}
probe syscall.fork.return = dw_syscall.fork.return !, nd_syscall.fork.return ? {}
# dw_fork _____________________________________________________
probe dw_syscall.fork = kernel.function("sys_fork").call ?
{
%(systemtap_v < "2.3" %?
regs = 0
%)
%(systemtap_v < "2.5" %?
clone_flags = 0
stack_start = 0
stack_size = 0
parent_tid_uaddr = 0
child_tid_uaddr = 0
%)
@_SYSCALL_FORK_NAME
@_SYSCALL_FORK_ARGSTR
}
probe dw_syscall.fork.return = kernel.function("sys_fork").return ?
{
@_SYSCALL_FORK_NAME
@SYSC_RETVALSTR($return)
}
# nd_fork _____________________________________________________
probe nd_syscall.fork = nd1_syscall.fork!, nd2_syscall.fork!, tp_syscall.fork
{ }
probe nd1_syscall.fork = kprobe.function("sys_fork").call ?
{
%(systemtap_v < "2.3" %?
regs = 0
%)
%(systemtap_v < "2.5" %?
clone_flags = 0
stack_start = 0
stack_size = 0
parent_tid_uaddr = 0
child_tid_uaddr = 0
%)
@_SYSCALL_FORK_NAME
@_SYSCALL_FORK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.fork = kprobe.function(@arch_syscall0_prefix "sys_fork") ?
{
%(systemtap_v < "2.3" %?
regs = 0
%)
%(systemtap_v < "2.5" %?
clone_flags = 0
stack_start = 0
stack_size = 0
parent_tid_uaddr = 0
child_tid_uaddr = 0
%)
@_SYSCALL_FORK_NAME
@_SYSCALL_FORK_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fork = kernel.trace("sys_enter")
{
@__syscall_compat_gate(@const("__NR_fork"), @const("__NR_compat_fork"))
%(systemtap_v < "2.3" %?
regs = 0
%)
%(systemtap_v < "2.5" %?
clone_flags = 0
stack_start = 0
stack_size = 0
parent_tid_uaddr = 0
child_tid_uaddr = 0
%)
@_SYSCALL_FORK_NAME
@_SYSCALL_FORK_ARGSTR
}
probe nd_syscall.fork.return = nd1_syscall.fork.return!, nd2_syscall.fork.return!, tp_syscall.fork.return
{ }
probe nd1_syscall.fork.return = kprobe.function("sys_fork").return ?
{
@_SYSCALL_FORK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.fork.return = kprobe.function(@arch_syscall0_prefix "sys_fork").return ?
{
@_SYSCALL_FORK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fork.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_fork"), @const("__NR_compat_fork"))
@_SYSCALL_FORK_NAME
@SYSC_RETVALSTR($ret)
}
|
