/usr/src/open-vm-tools-10.0.7/vsock/shared/driverLog.c is in open-vm-tools-dkms 2:10.0.7-3227872-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2007-2014 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*********************************************************/
/*
* driverLog.c --
*
* Common logging functions for Linux kernel modules.
*/
#include "driver-config.h"
#include "compat_kernel.h"
#include "compat_sched.h"
#include <asm/current.h>
#include "driverLog.h"
#define LINUXLOG_BUFFER_SIZE 1024
static const char *driverLogPrefix = "";
/*
* vsnprintf was born in 2.4.10. Fall back on vsprintf if we're
* an older kernel.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 10)
# define vsnprintf(str, size, fmt, args) vsprintf(str, fmt, args)
#endif
/*
*----------------------------------------------------------------------------
*
* DriverLog_Init --
*
* Initializes the Linux logging.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------------
*/
void
DriverLog_Init(const char *prefix) // IN
{
driverLogPrefix = prefix ? prefix : "";
}
/*
*----------------------------------------------------------------------
*
* DriverLogPrint --
*
* Log error message from a Linux module.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
DriverLogPrint(const char *level, // IN: KERN_* constant
const char *fmt, // IN: error format string
va_list args) // IN: arguments for format string
{
static char staticBuf[LINUXLOG_BUFFER_SIZE];
char stackBuf[128];
va_list args2;
const char *buf;
/*
* By default, use a small buffer on the stack (thread safe). If it is too
* small, fall back to a larger static buffer (not thread safe).
*/
va_copy(args2, args);
if (vsnprintf(stackBuf, sizeof stackBuf, fmt, args2) < sizeof stackBuf) {
buf = stackBuf;
} else {
vsnprintf(staticBuf, sizeof staticBuf, fmt, args);
buf = staticBuf;
}
va_end(args2);
printk("%s%s[%d]: %s", level, driverLogPrefix, current->pid, buf);
}
/*
*----------------------------------------------------------------------
*
* Warning --
*
* Warning messages from kernel module: logged into kernel log
* as warnings.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Warning(const char *fmt, ...) // IN: warning format string
{
va_list args;
va_start(args, fmt);
DriverLogPrint(KERN_WARNING, fmt, args);
va_end(args);
}
/*
*----------------------------------------------------------------------
*
* Log --
*
* Log messages from kernel module: logged into kernel log
* as debug information.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
Log(const char *fmt, ...) // IN: log format string
{
va_list args;
/*
* Use the kernel log with at least a KERN_DEBUG level
* so it doesn't garbage the screen at (re)boot time on RedHat 6.0.
*/
va_start(args, fmt);
DriverLogPrint(KERN_DEBUG, fmt, args);
va_end(args);
}
/*
*----------------------------------------------------------------------
*
* Panic --
*
* ASSERTION failures and Panics from kernel module get here.
* Message is logged to the kernel log and on console.
*
* Results:
* None.
*
* Side effects:
* Never returns
*
*----------------------------------------------------------------------
*/
void
Panic(const char *fmt, ...) // IN: panic format string
{
va_list args;
va_start(args, fmt);
DriverLogPrint(KERN_EMERG, fmt, args);
va_end(args);
#ifdef BUG
BUG();
#else
/* Should die with %cs unwritable, or at least with page fault. */
asm volatile("movb $0, %cs:(0)");
#endif
while (1);
}
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