Moxa-technologies THINKCORE W341 Manuel d'utilisateur télécharger pdf (Page 90)

ThinkCore W311/321/341 Linux User’s Manual Programmer’s Guide

6-5

int swtd_ack(int fd)

Description

Acknowledge sWatchDog. When the user application enable sWatchDog. It need to call this

function periodically with user predefined time in the application program.

Input

int fd - the file handle from swtd_open() return value.

Output

OK will be zero.

The other has some error, to get error code from errno().

int swtd_close(int fd)

Description

Close the file handle.

Input

int fd - the file handle from swtd_open() return value.

Output

OK will be zero.

The other has some error, to get error code from errno().

4. Special Note

When you “kill the application with -9” or “kill without option” or “Ctrl+c” the kernel will

change to auto ack the sWatchDog.

When your application enables the sWatchDog and does not ack, your application may have a

logical error, or your application has made a core dump. The kernel will not change to auto

ack. This can cause a serious problem, causing your system to reboot again and again.

5. User application example

Example 1:

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <moxadevice.h>

int main(int argc, char *argv[])

{

int fd;

fd = swtd_open();

if ( fd < 0 ) {

printf(“Open sWatchDog device fail !\n”);

exit(1);

}

swtd_enable(fd, 5000); // enable it and set it 5 seconds

while ( 1 ) {

// do user application want to do

…..

….

swtd_ack(fd);

…..

….

}

swtd_close(fd);

exit(0);

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Moxa-technologies THINKCORE W341 Manuel d'utilisateur Page 90

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