Want to Implement Timeout for one function in C

Question

Here i have one function which is listen mode. this function listing something which i got form some device.

Here when my function is in listen mode that time i want to create timeout. if i will not get any response from particular device than i want o exit from this function and have to notify.

if during this timeout period if i will get response from device than i have to continue with work and stop this timeout and there is no limits to complete this work in any time duration.

So how can i implement this thing for a function.

Any body please can me help me to implement this thing with timeout functionality.

I think the only sane way to do this is to start a separate processes, which you then kill if it takes too long. It is very hard to "stop" code that is running inside your process. — user406009
– user406009, Commented Jan 31, 2012 at 4:30

Greg Hewgill · Accepted Answer · 2012-01-31 04:36:57Z

5

Depending on how you are waiting for a response from this device, the answer to your question will be different. The basic framework is:

int do_something_with_device()
{
    if (!wait_for_response_from_device()) {
        return TIMEOUT_ERROR;
    }
    // continue with processing
}

As for how you implement wait_for_response_from_device(), well, every device is different. If you're using sockets or pipes, use select(). If you're interfacing with something that requires a busy-wait loop, it might look like:

int wait_for_response_from_device()
{
    time_t start = time(NULL);
    while (time(NULL) - start < TIMEOUT) {
        if (check_device_ready()) {
            return 1;
        }
    }
    return 0;
}

Naturally, the implementation of check_device_ready() would be up to you.

answered Jan 31, 2012 at 4:36

Greg Hewgill

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2 Comments

user1089679 Over a year ago

Here i have one function which put my device in listen mode , because my device is ready to receive file from any device through bluetooth. here i am using obex_test library for this

user1089679 Over a year ago

After some time if i am not getting response form remote device means (any mobile device) than i have to disconnect this and notify my server

Borealid · Accepted Answer · 2012-01-31 04:30:53Z

3

Take a look at man 2 alarm. You can set or disable signals which will be sent to your application after a certain time period elapses.

answered Jan 31, 2012 at 4:30

Borealid

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