Moxa V2406-24I-CT-T-XPE [57/81] Special note

V2406/2422/2426 Linux User’s Manual Programming Guide

4-7

Function int swtd_ack(int fd)

Description Acknowledge software watchdog.

When software watchdog is enabled, application should execute swtd_ack() periodically

within user predefined time.

Input <fd>

the file handle from swtd_open() return value.

Output None

Return On success, 0 is returned. Otherwise, an error number is return

Function int swtd_close(int fd)

Description Close the file handle.

Input <fd> the file handle from swtd_open() return value.

Output None

Return On success, 0 is returned. Otherwise, an error number is return

Special Note

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

software watchdog.

When your application enables the software watchdog and does not ack, your application may have a logical

error, or your application has generated a core dump. The kernel will not change to auto ack. This can cause

your system to reboot again and again.

Examples

The example file watchdog.c and Makefile are put in the folder \example\swatchdog\ on the CD.