bind (2)

NAME

       bind - bind a name to a socket

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>

       int bind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen);

DESCRIPTION

       bind  gives  the  socket  sockfd the local address my_addr.  my_addr is
       addrlen bytes long.  Traditionally, this is called "assigning a name to
       a  socket."   When  a  socket is created with socket(2), it exists in a
       name space (address family) but has no name assigned.

       It is normally necessary to assign a local address using bind before  a
       SOCK_STREAM socket may receive connections (see accept(2)).

       The  rules used in name binding vary between address families.  Consult
       the manual entries in Section 7 for detailed information.  For  AF_INET
       see  ip(7),  for  AF_UNIX see unix(7), for AF_APPLETALK see ddp(7), for
       AF_PACKET see packet(7), for AF_X25 see x25(7) and for  AF_NETLINK  see
       netlink(7).

RETURN VALUE

       On  success,  zero is returned.  On error, -1 is returned, and errno is
       set appropriately.

ERRORS

       EBADF  sockfd is not a valid descriptor.

       EINVAL The socket is already bound to an address.  This may  change  in
              the future: see linux/unix/sock.c for details.

       EACCES The address is protected, and the user is not the super-user.

       ENOTSOCK
              Argument is a descriptor for a file, not a socket.

       The following errors are specific to UNIX domain (AF_UNIX) sockets:

       EINVAL The  addrlen is wrong, or the socket was not in the AF_UNIX fam-
              ily.

       EROFS  The socket inode would reside on a read-only file system.

       EFAULT my_addr points outside the user's accessible address space.

       ENAMETOOLONG
              my_addr is too long.

       ENOENT The file does not exist.

       ENOMEM Insufficient kernel memory was available.
       The transparent proxy options are not described.

CONFORMING TO

       SVr4, 4.4BSD (the bind function first appeared in BSD 4.2).  SVr4 docu-
       ments  additional  EADDRNOTAVAIL,  EADDRINUSE,  and ENOSR general error
       conditions, and additional EIO and EISDIR Unix-domain error conditions.

NOTE

       The  third  argument of bind is in reality an int (and this is what BSD
       4.* and libc4 and libc5 have).  Some POSIX confusion  resulted  in  the
       present socklen_t. See also accept(2).

SEE ALSO

       accept(2),  connect(2),  listen(2),  socket(2),  getsockname(2), ip(7),
       socket(7)

Linux 2.2                         1998-10-03                           bind(2)