How to implement a blocking read on a file on Unix/C ?

[koblu]

I need to write a file reader function which will continuosly read a file being actively written to by another process. What is the best way to implement this blocking read efficiently ?

 

[Salem]

You mean like the [tt]tail -f[/tt] command?

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[dchoulette]

I would use [tt]sleep[/tt], [tt]fread[/tt], [tt]feof[/tt] and [tt]clearerr[/tt] in a loop.

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Denis

 

[adrstan1]

I guess you can lock the file using fcntl function.

 

[koblu]

Yes, kind of like the "tail -f" command. Is there a way to block a read or fread call without going to sleep ? I want this function to do minimal CPU hogging.

 

[dchoulette]

The sleep function does no CPU hogging.

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Denis