Manual page for ACCEPT(2)
accept - accept a connection on a socket
SYNOPSIS
#include <sys/types.h>
#include <sys/socket.h>
ns = accept(s, addr, addrlen)
int ns, s;
struct sockaddr *addr;
int *addrlen;
DESCRIPTION
The argument
s
is a socket that has been created with
socket.2
bound to an address with
bind.2
and is listening for connections after a
listen.2
Accept
extracts the first connection
on the queue of pending connections, creates
a new socket with the same properties of
s
and allocates a new file descriptor,
ns,
for the socket. If no pending connections are
present on the queue, and the socket is not marked
as non-blocking,
accept
blocks the caller until a connection is present.
If the socket is marked non-blocking and no pending
connections are present on the queue,
accept
returns an error as described below.
The accepted socket,
ns,
may not be used
to accept more connections. The original socket
s
remains open.
The argument
addr
is a result parameter that is filled in with
the address of the connecting entity,
as known to the communications layer.
The exact format of the
addr
parameter is determined by the domain in which the communication
is occurring.
The
addrlen
is a value-result parameter; it should initially contain the
amount of space pointed to by
addr;
on return it will contain the actual length (in bytes) of the
address returned.
This call
is used with connection-based socket types, currently with SOCK_STREAM.
It is possible to
select.2
a socket for the purposes of doing an
accept
by selecting it for read.
RETURN VALUE
The call returns -1 on error. If it succeeds, it returns a non-negative
integer that is a descriptor for the accepted socket.
ERRORS
The accept will fail if:
- [EBADF]
-
The descriptor is invalid.
- [ENOTSOCK]
-
The descriptor references a file, not a socket.
- [EOPNOTSUPP]
-
The referenced socket is not of type SOCK_STREAM.
- [EFAULT]
-
The addr parameter is not in a writable part of the
user address space.
- [EWOULDBLOCK]
-
The socket is marked non-blocking and no connections
are present to be accepted.
SEE ALSO
bind(2), connect(2), listen(2), select(2), socket(2)
Created by unroff & hp-tools.
© somebody (See intro for details). All Rights Reserved.
Last modified 11/5/97
