EVENTFD_SIGNAL(9)                 Events based on file descripto                EVENTFD_SIGNAL(9)



NAME
       eventfd_signal - Adds n to the eventfd counter.

SYNOPSIS
       __u64 eventfd_signal(struct eventfd_ctx * ctx, __u64 n);

ARGUMENTS
       ctx
           [in] Pointer to the eventfd context.

       n
           [in] Value of the counter to be added to the eventfd internal counter. The value
           cannot be negative.

DESCRIPTION
       This function is supposed to be called by the kernel in paths that do not allow sleeping.
       In this function we allow the counter to reach the ULLONG_MAX value, and we signal this as
       overflow condition by returning a POLLERR to poll(2).

       Returns the amount by which the counter was incremented. This will be less than n if the
       counter has overflowed.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                         EVENTFD_SIGNAL(9)