Adlink CSA-5200 Manual do Utilizador descarregar pdf (Página 36)

CSA-5200

PROTOTYPE

static ssize_t write(struct file *file, const char __user *data,size_t len, loff_t *ppos)

DESCRIPTION

This function is used to write information to be given to watchdog device.

int write(int handle, void *buf, int nbyte) may be used in client to call this feature.

PARAMETERS

handle [IN] File handle to the watchdog;

buf [IN] Buffer to write;

nbyte [IN] Count of bytes;

RETURN

Number of bytes actually written: success

-1: error

6.2.3 ioctl

The Watchdog Driver provides several ioctl options:

WDIOS_DISABLECARD, used to turn off the watchdog timer. The Watchdog Driver support

module parameter WATCHDOG_NOWAYOUT. If it is set, there is no way of disabling the

watchdog once it has been started. So, if the watchdog daemon crashes, the system will

reboot after the timeout has passed.

WDIOS_ENABLECARD, used to turn on the watchdog timer.

WDIOC_SETOPTIONS, used to set the watchdog status.

WDIOC_GETSTATUS, used to determines the status supported by watchdog ioctl. The

status bit of the device does not allow distinguishing between a regular system reset and a

watchdog forced reset. But, in test mode it is useful, so it is supported through

WDIOC_GETSTATUS watchdog ioctl. Additionally the driver reports the keepalive signal and

the acception of the magic.

WDIOC_SETTIMEOUT, used to change the watchdog timeout parameter (1s-255s). The

Watchdog Driver support module parameter DEFAULT_TIMEOUT. If it set then the

Watchdog Driver will use it as the watchdog timeout parameter. If it is not set, the default

watchdog timeout parameter is 5s.

WDIOC_GETTIMEOUT, used to query the watchdog timeout parameter.

WDIOC_KEEPALIVE, used to feed the watchdog, just like the write () interface.

WDIOC_ENABLEBYPS, which is a custom command, used to enable the LAN bypass.

Defined as below:

#define WDIOC_ENABLEBYPS _IOR(WATCHDOG_IOCTL_BASE, 101, int)

WDIOC_DISABLEBYPS, which is a custom command, used to disable the LAN bypass.

Defined as below:

#define WDIOC_DISABLEBYPS _IOR(WATCHDOG_IOCTL_BASE, 102, int)

PROTOTYPE

static long ioctl(struct file *file, unsigned int cmd, unsigned long arg)

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Adlink CSA-5200 Manual do Utilizador Página 36