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->ACCEPT(2) System Calls Manual ACCEPT(2)
-
-NAME
- accept - accept a connection on a socket
-
-SYNOPSIS
- #include <sys/types.h>
- #include <sys/socket.h>
-
- int
- accept(int s, struct sockaddr *addr, socklen_t *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). The accept() argument extracts the first connection request
- on the queue of pending connections, creates a new socket with the same
- properties of s, and allocates a new file descriptor 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 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) or poll(2) a socket for the purposes of doing
- an accept() by selecting it for read.
-
- For certain protocols which require an explicit confirmation, such as ISO
- or DATAKIT, accept() can be thought of as merely dequeuing the next con-
- nection request and not implying confirmation. Confirmation can be
- implied by a normal read or write on the new file descriptor, and rejec-
- tion can be implied by closing the new socket.
-
- One can obtain user connection request data without confirming the con-
- nection by issuing a recvmsg(2) call with an msg_iovlen of 0 and a non-
- zero msg_controllen, or by issuing a getsockopt(2) request. Similarly,
- one can provide user connection rejection information by issuing a
- sendmsg(2) call with providing only the control information, or by call-
- ing setsockopt(2).
-
-RETURN VALUES
- 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.
-
- [EINVAL] The referenced socket is not listening for connections
- (that is, listen(2) has not yet been called).
-
- [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.
-
- [EMFILE] The per-process descriptor table is full.
-
- [ENFILE] The system file table is full.
-
- [ECONNABORTED] A connection has been aborted.
-
-SEE ALSO
- bind(2), connect(2), listen(2), poll(2), select(2), poll(2), socket(2)
-
-HISTORY
- The accept() function appeared in 4.2BSD.
-
-BSD February 15, 1999 BSD
- </PRE
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