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

View File Name : sysc_fsync.stp

# fsync ______________________________________________________
# long sys_fsync(unsigned int fd)

@define _SYSCALL_FSYNC_NAME
%(
	name = "fsync"
%)

@define _SYSCALL_FSYNC_ARGSTR
%(
	argstr = sprint(fd)
%)

@define _SYSCALL_FSYNC_REGARGS
%(
	fd = int_arg(1)
%)

@define _SYSCALL_FSYNC_REGARGS_STORE
%(
        if (@probewrite(fd))
          set_int_arg(1, fd)
%)

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

# dw_fsync _____________________________________________________

probe dw_syscall.fsync = kernel.function("sys_fsync").call
{
	@_SYSCALL_FSYNC_NAME
	fd = __int32($fd)
	@_SYSCALL_FSYNC_ARGSTR
}
probe dw_syscall.fsync.return = kernel.function("sys_fsync").return
{
	@_SYSCALL_FSYNC_NAME
	@SYSC_RETVALSTR($return)
}

# nd_fsync _____________________________________________________

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

probe nd1_syscall.fsync = kprobe.function("sys_fsync") ?
{
	@_SYSCALL_FSYNC_NAME
	asmlinkage()
	@_SYSCALL_FSYNC_REGARGS
	@_SYSCALL_FSYNC_ARGSTR
}

/* kernel 4.17+ */
probe nd2_syscall.fsync = kprobe.function(@arch_syscall_prefix "sys_fsync") ?
{
	__set_syscall_pt_regs(pointer_arg(1))
	@_SYSCALL_FSYNC_NAME
	@_SYSCALL_FSYNC_REGARGS
	@_SYSCALL_FSYNC_ARGSTR
},
{
        @_SYSCALL_FSYNC_REGARGS_STORE
}

/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.fsync = kernel.trace("sys_enter")
{
	__set_syscall_pt_regs($regs)
	@__syscall_compat_gate(@const("__NR_fsync"), @const("__NR_compat_fsync"))
	@_SYSCALL_FSYNC_NAME
	@_SYSCALL_FSYNC_REGARGS
	@_SYSCALL_FSYNC_ARGSTR
},
{
        @_SYSCALL_FSYNC_REGARGS_STORE
}

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

probe nd1_syscall.fsync.return = kprobe.function("sys_fsync").return ?
{
	@_SYSCALL_FSYNC_NAME
	@SYSC_RETVALSTR(returnval())
}

/* kernel 4.17+ */
probe nd2_syscall.fsync.return = kprobe.function(@arch_syscall_prefix "sys_fsync").return ?
{
	@_SYSCALL_FSYNC_NAME
	@SYSC_RETVALSTR(returnval())
}

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