accept – accept a connection on a socket
cc [ flag ... ] file ... -lsocket -lnsl [ library ... ]
#include <sys/types.h>
#include <sys/socket.h>
int accept(int s, struct sockaddr *addr, socklen_t *addrlen);
The argument s is a socket that has been created with socket(3SOCKET) and bound
to an address with bind(3SOCKET), and that is listening for connections after a call to
listen(3SOCKET). The accept() function extracts the first connection on the queue
of pending connections, creates a new socket with the 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 as non-blocking and no pending
connections are present on the queue, accept() returns an error as described below.
The accept() function uses the netconfig(4) file to determine the STREAMS
device file name associated with s. This is the device on which the connect indication
will be accepted. The accepted socket, ns, is used to read and write data to and from
the socket that connected to ns. It is not used to accept more connections. The original
socket (s) remains open for accepting further connections.
The argument addr is a result parameter that is filled in with the address of the
connecting entity as it is known to the communications layer. The exact format of the
addr parameter is determined by the domain in which the communication occurs.
The argument addrlen is a value-result parameter. Initially, it contains the amount of
space pointed to by addr; on return it contains the length in bytes of the address
returned.
The accept() function is used with connection-based socket types, currently with
SOCK_STREAM.
It is possible to select(3C) or poll(2) a socket for the purpose of an accept() by
selecting or polling it for a read. However, this will only indicate when a connect
indication is pending; it is still necessary to call accept().
The accept() function returns −1 on error. If it succeeds, it returns a non-negative
integer that is a descriptor for the accepted socket.
accept() will fail if:
EBADF The descriptor is invalid.
ECONNABORTED The remote side aborted the connection before the
accept() operation completed.
EFAULT The addr parameter or the addrlen parameter is invalid.
EINTR The accept() attempt was interrupted by the
delivery of a signal.
EMFILE The per-process descriptor table is full.
accept(3SOCKET)
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUES
ERRORS
18 man pages section 3: Networking Library Functions • Last Revised 24 Jan 2002
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