bind(2)                                                             bind(2)




 NAME
      bind - bind an address to a socket

 SYNOPSIS
      #include <sys/socket.h>

    AF_CCITT only
      #include <x25/x25addrstr.h>

    AF_INET only
      #include <netinet/in.h>

    AF_UNIX only
      #include <sys/un.h>

      int bind(int s, const void *addr, int addrlen);

    _XOPEN_SOURCE_EXTENDED only
      int bind(int s, const struct sockaddr *addr, size_t addrlen);

 DESCRIPTION
      The bind() system call assigns an address to an unbound socket.  When
      a socket is created with socket(), it exists in an address space
      (address family) but has no address assigned.  bind() causes the
      socket whose descriptor is s to become bound to the address specified
      in the socket address structure pointed to by addr.

      addrlen must specify the size of the address structure.  Since the
      size of the socket address structure varies between socket address
      families, the correct socket address structure should be used with
      each address family (for example, struct sockaddr_in for AF_INET, and
      struct sockaddr_un for AF_UNIX).  Typically, the sizeof() function is
      used to pass this value in the bind() call (for example, sizeof(struct
      sockaddr_in)).

      The rules used in address binding vary between communication domains.
      For example, when binding an AF_UNIX socket to a path name (such as
      /tmp/mysocket), an open file having that name is created in the file
      system.  When the bound socket is closed, that file still exists
      unless it is removed or unlinked.  When binding an AF_INET socket,
      sin_port can be a port number or it can be zero.  If sin_port is zero,
      the system assigns an unused port number automatically.

 RETURN VALUE
      bind() returns the following values:

            0   Successful completion.
           -1   Failure.  errno is set to indicate the error.

 ERRORS
      If bind() fails, errno is set to one of the following values.

           [EACCES]              The requested address is protected, and the
                                 current user has inadequate permission to
                                 access it.  (This error can be returned by
                                 AF_INET only.)

           [EADDRINUSE]          The specified address is already in use.

           [EADDRNOTAVAIL]       The specified address is invalid or not
                                 available from the local machine, or for
                                 AF_CCITT sockets which use "wild card"
                                 addressing, the specified address space
                                 overlays the address space of an existing
                                 bind.

           [EAFNOSUPPORT]        The specified address is not a valid
                                 address for the address family of this
                                 socket.

           [EBADF]               s is not a valid file descriptor.

           [EDESTADDRREQ]        No addr parameter was specified.

           [EFAULT]              addr is not a valid pointer.

           [EINVAL]              The socket is already bound to an address,
                                 the socket has been shut down, addrlen is a
                                 bad value, or an attempt was made to bind()
                                 an AF_UNIX socket to an NFS-mounted
                                 (remote) name.

                                 AF_CCITT: The protocol-ID length is
                                 negative or greater than 8, the X.121
                                 address string contains an illegal
                                 character, or the X.121 address string is
                                 greater than 15 digits long.

           [ENETDOWN]            The x25ifname field name specifies an
                                 interface that was shut down, or never
                                 initialized, or whose Level 2 protocol
                                 indicates that the link is not working:
                                 Wires might be broken, the interface hoods
                                 on the modem are broken, the modem failed,
                                 the phone connection failed (this error can
                                 be returned by AF_CCITT only), noise
                                 interfered with the line for a long period
                                 of time.

           [ENETUNREACH]         The X.25 Level 2 protocol is down.  The
                                 X.25 link is not working: Wires might be
                                 broken, or connections are loose on the
                                 interface hoods at the modem, the modem
                                 failed, or noise interfered with the line
                                 for an extremely long period of time.

           [ENOBUFS]             No buffer space is available.  The bind()
                                 cannot complete.

           [ENODEV]              The x25ifname field name specifies a
                                 nonexistent interface.  (This error can be
                                 returned by AF_CCITT only.)

           [ENOTSOCK]            s is a valid file descriptor, but it is not
                                 a socket.

           [EOPNOTSUPP]          The socket referenced by s does not support
                                 address binding.

 AUTHOR
      bind() was developed by the University of California, Berkeley.

 FUTURE DIRECTION
      The default behavior in this release is still the classic HP-UX BSD
      Sockets, however it will be changed to X/Open Sockets in some future
      release.  At that time, any HP-UX BSD Sockets behavior which is
      incompatible with X/Open Sockets may be obsoleted.  HP customers are
      advised to migrate their applications to conform to X/Open
      specification( see xopen_networking(7) ).

 SEE ALSO
      connect(2), getsockname(2), listen(2), socket(2), af_ccitt(7F),
      inet(7F), socketx25(7), tcp(7P), udp(7P), unix(7P),
      xopen_networking(7).

 STANDARDS CONFORMANCE
      bind(): XPG4


 Hewlett-Packard Company            - 3 -    HP-UX Release 10.20:  July 1996