EPOLL_CREATE(3C) Standard C Library Functions EPOLL_CREATE(3C)


NAME


epoll_create, epoll_create1 - create an epoll instance

SYNOPSIS


#include <sys/epoll.h>

int epoll_create(int size);


int epoll_create1(int flags);


DESCRIPTION


The epoll_create() and epoll_create1() functions both create an epoll(5)
instance that can be operated upon via epoll_ctl(3C), epoll_wait(3C) and
epoll_pwait(3C). epoll instances are represented as file descriptors,
and should be closed via close(2).

The only difference between the two functions is their signature;
epoll_create() takes a size argument that is vestigal and is only
meaningful in as much as it must be greater than zero, while
epoll_create1() takes a flags argument that can have any of the following
values:


EPOLL_CLOEXEC
Instance should be closed upon an exec(2); see open(2)'s
description of O_CLOEXEC.


RETURN VALUES


Upon successful completion, 0 is returned. Otherwise, -1 is returned and
errno is set to indicate the error.

ERRORS


The epoll_create() and epoll_create1() functions will fail if:

EINVAL
Either the size is zero (epoll_create()) or the flags are
invalid (epoll_create1()).


EMFILE
There are currently {OPEN_MAX} file descriptors open in the
calling process.


ENFILE
The maximum allowable number of files is currently open in the
system.


NOTES


The epoll(5) facility is implemented for purposes of offering
compatibility for Linux-borne applications; native applications should
continue to prefer using event ports via the port_create(3C),
port_associate(3C) and port_get(3C) interfaces. See epoll(5) for
compatibility details and restrictions.


SEE ALSO


epoll_ctl(3C), epoll_wait(3C), epoll(5)


April 9, 2016 EPOLL_CREATE(3C)