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+NAME="NET-COMMON-TCPIP-MANPAGES-ACCEPT">accept</H1
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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
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