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.
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.