Moxa DA-681-I-SP-LX [27/65] Close the file handle
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Moxa DA-681-I-SP-LX [27/65] Close the file handle

Moxa DA-681-I-SP-LX [27/65] Close the file handle
DA-681 Linux Software Configuration
2-16
unsigned long *time – the function will return the current time period.
Output:
OK will be zero.
The other has some error, to get error code from errno().
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().
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.
4. User application example.
Example 1:
#include <stdio.h>
#include <stdlib.h>
#include <string.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);

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