| eventfd_ctx_read(9) - phpMan
EVENTFD_CTX_READ(9) Events based on file descripto EVENTFD_CTX_READ(9)
NAME
eventfd_ctx_read - Reads the eventfd counter or wait if it is zero.
SYNOPSIS
ssize_t eventfd_ctx_read(struct eventfd_ctx * ctx, int no_wait, __u64 * cnt);
ARGUMENTS
ctx
[in] Pointer to eventfd context.
no_wait
[in] Different from zero if the operation should not block.
cnt
[out] Pointer to the 64-bit counter value.
DESCRIPTION
Returns 0 if successful, or the following error codes:
-EAGAIN : The operation would have blocked but no_wait was non-zero. -ERESTARTSYS : A
signal interrupted the wait operation.
If no_wait is zero, the function might sleep until the eventfd internal counter becomes
greater than zero.
COPYRIGHT
Kernel Hackers Manual 4.8. January 2017 EVENTFD_CTX_READ(9)
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