csignalssleepselect-function

Using sleep and select with signals

I want to use the select() function to wait for 1 second, as my program uses signals to control stuff, so sleep() would return prematurely. The weird thing is that when using select() it also returns prematurely.

I am calling select like this 

struct timeval timeout;    
timeout.tv_sec = 10;  
timeout.tv_usec = 1000000; 
select (0 ,NULL, NULL, NULL, &timeout);

but whenever a signal arrives, it returns (I am using a nano second timer for the signal)

Anyone knows why?

Solution

  • Try something like this:

    struct timespec timeout;
timeout.tv_sec = 10;
timeout.tv_nsec = 0;
while (nanosleep(&timeout, &timeout) && errno == EINTR);

    The "remaining time" pointer to nanosleep will take care of letting you restart the sleep with the necessary amount of remaining time if it gets interrupted.