1. NAME▲

eventfd_signal - Adds n to the eventfd counter.

2. SYNOPSIS ▲

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

3. 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.

4. 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 returining a POLLERR to poll(2).

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

5. COPYRIGHT ▲