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accept - accept a new connection on a socket

cc [ flag ... ] file ... -lxnet [ library ... ]
#include <sys/socket.h>


int accept(int socket, struct sockaddr *restrict address,
 socklen_t *restrict address_len);

The accept() function extracts the first connection on the queue of pending connections, creates a new socket with the same socket type protocol and address family as the specified socket, and allocates a new file descriptor for that socket.

The function takes the following arguments: socket

address address_len

If address is not a null pointer, the address of the peer for the accepted connection is stored in the sockaddr structure pointed to by address, and the length of this address is stored in the object pointed to by address_len.

If the actual length of the address is greater than the length of the supplied sockaddr structure, the stored address will be truncated.

If the protocol permits connections by unbound clients, and the peer is not bound, then the value stored in the object pointed to by address is unspecified.

If the listen queue is empty of connection requests and O_NONBLOCK is not set on the file descriptor for the socket, accept() will block until a connection is present. If the listen(3XNET) queue is empty of connection requests and O_NONBLOCK is set on the file descriptor for the socket, accept() will fail and set errno to EAGAIN or EWOULDBLOCK.

The accepted socket cannot itself accept more connections. The original socket remains open and can accept more connections.

When a connection is available, select(3C) will indicate that the file descriptor for the socket is ready for reading.

Upon successful completion, accept() returns the nonnegative file descriptor of the accepted socket. Otherwise, -1 is returned and errno is set to indicate the error.

The accept() function will fail if: EAGAIN

EWOULDBLOCK

EBADF ECONNABORTED EFAULT EINTR EINVAL EMFILE ENFILE ENOTSOCK EOPNOTSUPP

The accept() function may fail if: ENOBUFS

ENOMEM ENOSR EPROTO

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard

MT-Level MT-Safe

sockaddr(3SOCKET), bind(3XNET), connect(3XNET), listen(3XNET), socket(3XNET), attributes(5), standards(5)