I have embedded data logger in which data comes from external sensors which are stored temporarily in a file (tmpfs) and are backed up into another file on flash. How can i implement a brown out handler by which i can save the data from being lost ?
Brown out implementation in Linux?
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Having a brown-out handler in a system is just matter of having Linux kernel device driver implementation. For such a task, the best would be to consult the LDD book.
But if you ask me, more important question is if it would really help you to save the data? Because brown-out is just that: a brown-out :) I would not bet you will have enough time to save all of the data (depends on a data size, RAM/flash R/W speed, internal priority handling of kernel, maybe some other timings as well, etc.).
Generally, such a problem is tackled with usage of journaling file systems, which prevent the system from having data corrupted (but cannot prevent the data loss). More info on such systems: Journaling File System