EPOLL_CREATESection: Linux Programmer's Manual (2)
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NAMEepoll_create - open an epoll file descriptor
DESCRIPTIONOpen an epoll file descriptor by requesting the kernel allocate an event backing store dimensioned for size descriptors. The size is not the maximum size of the backing store but just a hint to the kernel about how to dimension internal structures. The returned file descriptor will be used for all the subsequent calls to the epoll interface. The file descriptor returned by epoll_create(2) must be closed by using close(2).
RETURN VALUEWhen successful, epoll_create(2) returns a non-negative integer identifying the descriptor. When an error occurs, epoll_create(2) returns -1 and errno is set appropriately.
- size is not positive.
- The system limit on the total number of open files has been reached.
- There was insufficient memory to create the kernel object.
CONFORMING TOepoll_create(2) is Linux specific, and was introduced in kernel 2.5.44.
SEE ALSOclose(2), epoll_ctl(2), epoll_wait(2), epoll(7)