Adlink CSA-5200 Manual de usuario descargar pdf (Pagina 37)

CSA-5200

DESCRIPTION

This function defines functions for the watchdog device according to the available

features.

int ioctl(int handle, int cmd,[int *argdx, int argcx]) may be used in client to call this

feature.

PARAMETERS

handle [IN] File handle to the watchdog;

cmd [IN] Watchdog command, such as “WDIOC_xxx”;

argxx [IN/OUT] Argument pointer, such as“WDIOS_xxx”, only used after

WDIOC_SETOPTIONS.

RETURN

0: success

-1: error

6.2.4 release

The Watchdog Driver provides several ioctl options:

Closing the watchdog device either stops the watchdog timer or in the case that nowayout is

set or the magic character wasn't written, a critical warning about a running watchdog timer

will be given.

PROTOTYPE

static int release(struct inode *inode, struct file *file)

DESCRIPTION

This function is used to check whether the watchdog device closing is expected or not. This

feature will be called automatically when closing the watchdog device file “/dev/watchdog”.

6.3 Sample Code

The following sample code is provided to illustrate how the SuperIO Watchdog timer and

LAN bypass control can be implemented.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/ioctl.h>

#include <linux/types.h>

#include <linux/watchdog.h>

#define WDIOC_ENABLEBYPS _IOR(WATCHDOG_IOCTL_BASE, 101, int)

#define WDIOC_DISABLEBYPS _IOR(WATCHDOG_IOCTL_BASE, 102, int)

int fd;

* This function simply sends an IOCTL to the driver, which in turn ticks

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Adlink CSA-5200 Manual de usuario Pagina 37