ACCEPT(2)                                               ACCEPT(2)



     NAME
          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



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     ACCEPT(2)                                               ACCEPT(2)



                              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)

     NOTE
          The primitives documented on this manual page are system
          calls, but unlike most system calls they are not resolved by
          libc.  To compile and link a program that makes these calls,
          follow the procedures for section (3B) routines as described
          in intro(3).

     ORIGIN
          4.3 BSD
































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