epoll_create1

Description

epoll_create1() creates an epoll "instance", requesting the kernel to allocate an event backing store dimensioned for size descriptors. epoll_create1() returns a file descriptor referring to the new epoll instance. This file descriptor is used for all the subsequent calls to the epoll interface. When no longer required, the file descriptor returned by epoll_create1() should be closed by using close(2). When all file descriptors referring to an epoll instance have been closed, the kernel destroys the instance and releases the associated resources for reuse.

The following value can be included in flags:

EPOLL_CLOEXEC Set the close-on-exec (FD_CLOEXEC) flag on the new file descriptor. See the description of the O_CLOEXEC flag in open(2) for reasons why this may be useful.

Return Value

On success, these system calls return a nonnegative file descriptor. On error, -1 is returned, and errno is set to indicate the error.

Errors

EINVAL size is not positive. EINVAL Invalid value specified in flags. EMFILE The per-user limit on the number of epoll instances imposed by /proc/sys/fs/epoll/max_user_instances was encountered. See epoll(7) for further details. ENFILE The system limit on the total number of open files has been reached. ENOMEM There was insufficient memory to create the kernel object.

Versions epoll_create1() was added to the kernel in version 2.6.27. Library support is provided in glibc starting with version 2.9.

extern (C)
int
epoll_create1

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