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// conversions tapset
// Copyright (C) 2005, 2006 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
function kernel_string:string (addr:long) %{ /* pure */
char *destination = THIS->__retvalue;
deref_string (destination, THIS->addr, MAXSTRINGLEN);
goto success;
deref_fault: /* branched to from deref() */
{
static char errmsg[40];
snprintf (errmsg, 40, "kernel string copy fault at 0x%p",
(void *) (uintptr_t) THIS->addr);
CONTEXT->last_error = errmsg;
}
success: ;
%}
# NB: accessing user space is hazardous from certain kernel contexts.
# Errors should be returned when this is detected.
function user_string:string (addr:long) %{ /* pure */
long rc = _stp_strncpy_from_user (THIS->__retvalue,
(const char __user*) (uintptr_t) THIS->addr,
MAXSTRINGLEN);
if (rc < 0)
{
static char errmsg[40];
snprintf (errmsg, 40, "user string copy fault at 0x%p",
(void *) (uintptr_t) THIS->addr);
CONTEXT->last_error = errmsg;
}
%}
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