1EVENTFD_CTX_READ(9)     Events based on file descripto     EVENTFD_CTX_READ(9)
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NAME

6       eventfd_ctx_read - Reads the eventfd counter or wait if it is zero.
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SYNOPSIS

9       ssize_t eventfd_ctx_read(struct eventfd_ctx * ctx, int no_wait,
10                                __u64 * cnt);
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ARGUMENTS

13       ctx
14           [in] Pointer to eventfd context.
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16       no_wait
17           [in] Different from zero if the operation should not block.
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19       cnt
20           [out] Pointer to the 64-bit counter value.
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DESCRIPTION

23       Returns 0 if successful, or the following error codes:
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25       -EAGAIN : The operation would have blocked but no_wait was non-zero.
26       -ERESTARTSYS : A signal interrupted the wait operation.
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28       If no_wait is zero, the function might sleep until the eventfd internal
29       counter becomes greater than zero.
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32Kernel Hackers Manual 3.10         June 2019               EVENTFD_CTX_READ(9)
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